/* 学搭子 · 品牌橙科技风 */
:root{
  --primary:#ea580c; --primary-weak:#fff3ea; --primary-soft:#fed7aa;
  --cyan:#f97316;
  --grad:linear-gradient(135deg,#f97316 0%,#fb923c 55%,#f59e0b 100%);
  --ink:#1e293b; --ink-2:#475569; --ink-3:#94a3b8;
  --bg:#faf7f4; --card:#ffffff; --line:#eee5dd;
  --ok:#059669; --warn:#d97706;
  --radius:12px;
}
*{box-sizing:border-box}
/* hidden 属性必须压得住组件的 display —— 否则 .manual-row{display:flex} 之类的类规则
   会把 [hidden] 的 UA 样式覆盖掉，导致「本该隐藏的按钮」照样显示（如做题页错误态的交卷按钮） */
[hidden]{display:none!important}
body{
  margin:0;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);line-height:1.6;
  background:var(--bg);
  background-image:radial-gradient(circle,#ecdfd3 1px,transparent 1px);
  background-size:26px 26px;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
code{background:var(--primary-weak);padding:1px 6px;border-radius:4px;font-size:.9em}

.container{max-width:1080px;margin:0 auto;padding:0 20px 60px}

/* header：毛玻璃 + 渐变底线 */
.site-head{background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.site-head::after{content:'';display:block;height:2px;background:var(--grad)}
.site-head .inner{max-width:1280px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:16px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;color:var(--ink);letter-spacing:.02em;white-space:nowrap;flex:0 0 auto}
.logo-img{width:32px;height:32px;border-radius:9px;box-shadow:0 2px 10px rgba(234,88,12,.35)}
.site-nav{display:flex;gap:6px;margin-left:auto;flex:1 1 auto;min-width:0;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;padding:6px 2px 2px}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{position:relative;padding:7px 13px;border-radius:8px;color:var(--ink-2);font-size:14px;white-space:nowrap;flex:0 0 auto}
.site-nav a:hover{background:var(--primary-weak);text-decoration:none}
.site-nav a.active{background:var(--grad);color:#fff;box-shadow:0 2px 8px rgba(234,88,12,.3)}
/* 更多下拉（工具类入口收纳） */
.nav-more{position:relative;flex:0 0 auto}
.nav-more-btn{display:inline-flex;align-items:center;gap:4px;padding:7px 13px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--ink-2);font-size:14px;cursor:pointer;white-space:nowrap;font-family:inherit}
.nav-more-btn:hover{background:var(--primary-weak);color:var(--primary);border-color:var(--primary)}
.nav-more-btn.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 2px 8px rgba(234,88,12,.3)}
.nm-caret{font-style:normal;font-size:10px;opacity:.7;transition:transform .15s}
.nav-more.open .nm-caret{transform:rotate(180deg)}
.nav-more-menu{display:none;position:fixed;z-index:80;min-width:160px;padding:6px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 32px rgba(120,63,4,.16)}
.nav-more-menu a{display:block;padding:9px 12px;border-radius:8px;color:var(--ink-2);font-size:14px;white-space:nowrap}
.nav-more-menu a:hover{background:var(--primary-weak);color:var(--primary);text-decoration:none}
.nav-more-menu a.active{background:var(--primary-weak);color:var(--primary);font-weight:700}

/* hero：深色渐变科技面板（品牌橙光晕） */
.hero{
  background:linear-gradient(135deg,#1c1917 0%,#431407 50%,#9a3412 100%);
  border-radius:22px;padding:52px 30px 48px;text-align:center;color:#fff;
  position:relative;overflow:hidden;margin-top:24px;
  box-shadow:0 20px 60px rgba(154,52,18,.35);
}
.hero::before{content:'';position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(255,255,255,.09) 1px,transparent 1px);
  background-size:22px 22px;pointer-events:none}
.hero::after{content:'';position:absolute;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(249,115,22,.45),transparent 65%);
  top:-160px;right:-120px;pointer-events:none;animation:float 7s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-18px)}}
.hero>*{position:relative;z-index:1}
.eyebrow{color:#fdba74;font-weight:600;letter-spacing:.14em;font-size:13px;margin:0 0 10px}
.hero h1{font-size:36px;margin:0 0 12px;letter-spacing:.02em}
.lede{color:var(--ink-2);max-width:620px;margin:0 auto 26px;font-size:15.5px}
.hero .lede{color:#fde8d0}
.hero-actions{display:flex;gap:14px;justify-content:center;align-items:center;flex-wrap:wrap}
.hero-actions:has(.cta-hint){margin-top:30px}
/* 首页三步说明 + 产品边界说明（帮家长一眼看懂怎么用、是什么） */
.hero-steps{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:22px auto 0;max-width:780px}
.hs-step{display:inline-flex;align-items:center;gap:8px;padding:8px 15px;border-radius:999px;
  background:rgba(255,247,237,.1);border:1px solid rgba(253,186,116,.34);color:#ffedd5;font-size:13.5px;backdrop-filter:blur(4px)}
.hs-step b{width:19px;height:19px;border-radius:50%;background:#fdba74;color:#7c2d12;font-size:11.5px;
  display:flex;align-items:center;justify-content:center;flex:none;font-weight:800}
.hero-note{margin:18px 0 0;font-size:12.5px;color:rgba(255,237,213,.62);letter-spacing:.02em}
/* 首页学习闭环：测评→薄弱点→出卷→批改→学会→地图→冲刺（桌面端一行排开，不分行） */
.flow-title{margin:24px 0 0;font-size:13px;color:#fdba74;font-weight:600;letter-spacing:.04em}
.flow-strip{display:flex;gap:5px;justify-content:center;align-items:center;flex-wrap:wrap;margin:0 auto clamp(22px,3.5vh,38px);max-width:none}
.fs-step{display:inline-flex;align-items:center;gap:5px;padding:8px 11px;border-radius:999px;white-space:nowrap;
  background:rgba(255,247,237,.1);border:1px solid rgba(253,186,116,.34);color:#ffedd5;font-size:12.5px;
  text-decoration:none;backdrop-filter:blur(4px);transition:background .15s,border-color .15s}
.fs-step:hover{background:rgba(253,186,116,.2);border-color:#fdba74;color:#fff;text-decoration:none}
.fs-step i{font-style:normal;font-size:14px;line-height:1}
.fs-arrow{color:rgba(253,186,116,.55);font-size:12px;flex:none}
/* hero 内次级按钮统一规格：同高同字号同圆角，仅以填充色区分层级 */
.hero .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:54px;padding:12px 30px;font-size:16px;font-weight:600;line-height:1;border-radius:13px;border-width:1.5px}
.hero .btn{background:rgba(255,247,237,.13);border:1.5px solid rgba(253,186,116,.7);color:#ffedd5;box-shadow:0 0 0 1px rgba(253,186,116,.12),0 2px 14px rgba(253,186,116,.22);backdrop-filter:blur(4px)}
.hero .btn:hover{background:rgba(253,186,116,.22);border-color:#fdba74;color:#fff;box-shadow:0 4px 20px rgba(253,186,116,.4);transform:translateY(-1px);text-decoration:none}
/* 中考冲刺按钮：白底橙字，在深色面板上高亮但不抢主CTA */
.hero .btn-zk{background:#fff;border:1.5px solid #fff;color:#c2410c;font-weight:700;box-shadow:0 2px 16px rgba(255,255,255,.28)}
.hero .btn-zk:hover{background:#fff7ed;border-color:#fff7ed;color:#9a3412;box-shadow:0 5px 22px rgba(255,255,255,.4);transform:translateY(-1px)}
/* 导航栏中考冲刺高亮 */
.site-nav a.nav-zk{color:#d97706;font-weight:700}
.site-nav a.nav-zk:hover{background:#fff3ea;color:#c2410c;text-decoration:none}
.site-nav a.nav-zk.active{background:var(--grad);color:#fff}
/* 会员入口：金色描边强调，与普通工具区分 */
.site-nav a.nav-vip{color:#b45309;font-weight:700;border:1px solid rgba(180,83,9,.28);border-radius:8px;padding:5px 12px}
.site-nav a.nav-vip:hover{background:#fff7ed;border-color:#f59e0b;color:#92400e;text-decoration:none}
.site-nav a.nav-vip.active{background:var(--grad);border-color:transparent;color:#fff}
.site-head .btn-sm,.site-head .child-switch{flex:0 0 auto;margin-left:2px}

/* 窄屏（<1320px）导航收紧一档，保证全部菜单可见不溢出；宽屏保持宽松 */
@media (max-width:1320px){
  .site-nav{gap:3px}
  .site-nav a{padding:6px 10px;font-size:13.5px}
  .brand{font-size:18px}
  .site-head .inner{gap:10px}
}
@media (max-width:1160px){
  .site-nav{gap:2px}
  .site-nav a{padding:6px 8px;font-size:13px}
  .brand{font-size:17px;gap:7px}
  .site-head .inner{gap:8px;padding:12px 14px}
}

.btn{display:inline-block;padding:10px 22px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-size:15px;cursor:pointer;transition:all .15s}
.btn:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}
.btn-primary{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 4px 14px rgba(234,88,12,.35)}
.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none;transform:none!important}
.btn-primary:hover{color:#fff;box-shadow:0 6px 20px rgba(249,115,22,.5);transform:translateY(-1px)}
.load-more{display:block;margin:20px auto 0}
.btn-lg{padding:13px 30px;font-size:16px}

.section-title{margin:40px 0 16px;font-size:20px;position:relative;padding-left:14px}
.section-title::before{content:'';position:absolute;left:0;top:4px;bottom:4px;width:4px;border-radius:4px;background:var(--grad)}
.meta-line{color:var(--ink-3);font-size:13px;margin:8px 0 12px}

/* stats：渐变顶边卡 */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.stat-card{background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-align:center;position:relative;overflow:hidden}
.stat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad)}
.stat-num{font-size:28px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-label{color:var(--ink-2);font-size:13px}

/* subject cards */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}
.subject-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:block;color:var(--ink);transition:all .15s}
.subject-card:hover{border-color:var(--primary);text-decoration:none;box-shadow:0 8px 24px rgba(234,88,12,.14);transform:translateY(-2px)}
.subject-card h3{margin:0 0 6px;font-size:18px}
.subject-card .nums{color:var(--ink-2);font-size:13px}
.subject-dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px}
.card-link{display:block;color:inherit}
.card-link:hover{text-decoration:none}

/* 年级直达胶囊 */
.grade-chips{margin-top:12px;border-top:1px dashed var(--line);padding-top:10px;display:flex;flex-direction:column;gap:5px}
.grade-row{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.stage-tag{font-size:11px;color:var(--ink-3);width:30px;flex:none}
.grade-pill{font-size:12px;padding:2px 9px;border-radius:999px;background:var(--primary-weak);color:var(--primary);transition:all .12s}
.grade-pill i{font-style:normal;opacity:.65;margin-left:3px;font-size:10.5px}
.grade-pill:hover{background:var(--grad);color:#fff;text-decoration:none}
.grade-bar{display:flex;align-items:center;gap:10px;background:#fff7ed;border:1px solid #fdba74;border-radius:10px;padding:8px 14px;margin-bottom:10px}

/* 首屏科目/年级选择器 */
.hero-selector{margin-top:8px}
.hs-subjects{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.subj-tab{padding:8px 22px;border-radius:999px;border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.1);color:#fff;font-size:15px;cursor:pointer;font-weight:600}
.subj-tab.on{background:#fff;color:#c2410c;border-color:#fff;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.subj-tab:not(.light):not(.on){border-color:var(--line);background:var(--card);color:var(--ink-2)}
.subj-tab:not(.light):not(.on):hover{border-color:var(--primary)}
.subj-tab.light:not(.on):hover{border-color:#fdba74}
.hs-grades{display:flex;flex-direction:column;gap:7px;max-width:640px;margin:0 auto 20px}
.hs-empty{color:rgba(255,255,255,.5);font-size:13px}
.grade-pill.big{font-size:13.5px;padding:5px 15px}
.grade-pill.big i{margin-left:5px;font-size:11.5px;opacity:.75}
.grade-pill.big.light{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.28)}
.grade-pill.big.light:hover{background:rgba(255,255,255,.25)}
.grade-pill.big.light.on{background:#fff;color:#c2410c;border-color:#fff;font-weight:700}
.disabled-link{opacity:.55;pointer-events:none}

/* 诊断页 */
.diag-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px 30px;margin-bottom:16px;box-shadow:0 4px 20px rgba(234,88,12,.06)}
/* 选择步骤块：① 科目 ② 年级学期 ③ 题量 —— 每步一张浅底小卡，不再挤在一起 */
.grade-pills{display:flex;gap:9px;flex-wrap:wrap;align-items:center}
.hero-subjects{display:flex;gap:9px;flex-wrap:wrap}
.pick-step{margin-top:16px;padding:16px 18px 18px;border:1px solid #f5e9db;border-radius:14px;background:#fffdf9}
.pick-step:first-of-type{margin-top:0}
.pick-head{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:12px}
.pick-no{width:21px;height:21px;border-radius:50%;background:var(--grad);color:#fff;font-size:12px;font-weight:800;
  display:inline-flex;align-items:center;justify-content:center;flex:none}
.pt-title{font-size:15px;font-weight:700;color:#7c2d12}
.pick-tip{margin-left:auto;font-size:12px;color:#b08a63;font-weight:500;text-align:right}
.sem-row{display:flex;align-items:center;gap:10px;margin-top:12px;padding-top:12px;border-top:1px dashed #f0e2d0}
.sem-label{font-size:12.5px;color:#a8805c;font-weight:600;flex:none}
.pick-step .grade-pill.big{font-size:14px;padding:8px 19px}
.pick-step .subj-tab{padding:8px 24px;font-size:14.5px}
.start-row{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap;align-items:center}
.start-row .btn-cta{flex:1;min-width:260px;justify-content:center}
@media (max-width:640px){
  .pick-step{padding:14px 14px 16px;border-radius:12px}
  .pick-tip{flex-basis:100%;margin-left:30px;text-align:left;margin-top:-4px}
  .pick-step .grade-pill.big{padding:7px 15px;font-size:13px}
  .pick-step .subj-tab{padding:7px 16px;font-size:13.5px}
  .start-row .btn-cta{width:100%;min-width:0}
}
.diag-card h3{margin:14px 0 10px;font-size:15px;color:var(--primary)}
.diag-card h3:first-child{margin-top:0}
#d-subjects{display:flex;gap:8px;flex-wrap:wrap}
#d-grades{display:flex;gap:7px;flex-wrap:wrap}
.grade-pill.big:not(.light){background:var(--primary-weak);color:var(--primary);border:1px solid transparent;cursor:pointer}
.grade-pill.big:not(.light):hover{border-color:var(--primary)}
.grade-pill.big:not(.light).on{background:var(--grad);color:#fff;font-weight:700}
#d-sizes{display:flex;gap:10px;flex-wrap:wrap}
.size-pill{display:inline-flex;flex-direction:column;align-items:center;gap:2px;padding:9px 20px;border-radius:12px;
  background:var(--card);border:1px solid var(--line);color:var(--ink-2);font-size:14px;font-weight:700;line-height:1.25;
  cursor:pointer;transition:all .15s}
.size-pill .pill-sub{font-size:11px;font-weight:400;color:var(--ink-3);white-space:nowrap}
.size-pill:hover{border-color:var(--primary);color:var(--primary)}
.size-pill.on{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 4px 14px rgba(234,88,12,.22)}
.size-pill.on .pill-sub{color:rgba(255,255,255,.88)}
.progress-track{height:8px;border-radius:99px;background:var(--primary-weak);overflow:hidden;margin-top:8px}.progress-fill{height:100%;border-radius:99px;background:var(--grad);transition:width .25s}
.opt-btn.sel{border-color:var(--primary);background:var(--primary-weak)}

/* 结果页 */
.result-head{display:flex;gap:28px;align-items:center;flex-wrap:wrap}
.score-ring{width:120px;height:120px;border-radius:50%;flex:none;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:conic-gradient(var(--primary) calc(var(--p)*1%), #fde8d8 0);position:relative}
.score-ring::before{content:'';position:absolute;inset:10px;border-radius:50%;background:#fff}
.score-ring b{position:relative;font-size:34px;color:var(--primary)}
.score-ring span{position:relative;font-size:13px;color:var(--ink-3)}
.result-sum{flex:1;min-width:260px}
.result-sum h2{margin:0 0 8px;font-size:21px}
.result-sum p{margin:4px 0;color:var(--ink-2)}
.chap-stats{display:flex;flex-direction:column;gap:8px}
.chap-stat-row{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 16px}
.cs-name{width:200px;flex:none;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cs-bar{flex:1;height:10px;border-radius:99px;background:var(--primary-weak);overflow:hidden}
.cs-fill{height:100%;border-radius:99px}
.cs-fill.good{background:var(--ok)}
.cs-fill.bad{background:#dc2626}
.cs-num{font-size:13px;color:var(--ink-2);width:44px;text-align:right}

/* toolbar */
.page-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin:28px 0 16px}
.page-head h1{font-size:26px;margin:0}
/* 知识点地图：两个视图切换（学习进度 / 知识点关系） */
.map-tabs{display:inline-flex;gap:4px;padding:4px;background:var(--primary-weak);border-radius:12px;margin:0 0 14px}
.map-tabs a{padding:7px 16px;border-radius:9px;font-size:13.5px;color:var(--primary);font-weight:600;white-space:nowrap;transition:all .15s}
.map-tabs a:hover{background:rgba(255,255,255,.75);text-decoration:none}
.map-tabs a.on{background:#fff;color:#c2410c;box-shadow:0 2px 8px rgba(234,88,12,.16)}
.subject-switch{display:flex;gap:6px;flex-wrap:wrap}
.subject-switch button{padding:7px 16px;min-height:36px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--ink-2);cursor:pointer;font-size:14px}
.subject-switch button.on{background:var(--primary);border-color:transparent;color:#fff}

.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.input{padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:var(--card);font-size:14px;color:var(--ink)}
.input:focus{outline:2px solid var(--primary-soft);border-color:var(--primary)}
.grow{flex:1;min-width:200px}

/* graph page */
.graph-layout{display:grid;grid-template-columns:minmax(280px,380px) 1fr;gap:16px;align-items:start}
@media(max-width:760px){.graph-layout{grid-template-columns:1fr}}
.topic-list{display:flex;flex-direction:column;gap:8px;max-height:72vh;overflow:auto;padding-right:4px}
.topic-item{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer}
.topic-item:hover{border-color:var(--primary)}
.topic-item.on{border-color:var(--primary);background:var(--primary-weak)}
.topic-item .t-name{font-weight:600}
.topic-item .t-meta{color:var(--ink-3);font-size:12px;margin-top:2px}
.chip{display:inline-block;padding:1px 8px;border-radius:999px;font-size:11px;background:var(--primary-soft);color:var(--primary);margin-right:4px}
.chip.gray{background:var(--bg);color:var(--ink-3);border:1px solid var(--line)}

.topic-detail{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;min-height:300px;position:sticky;top:70px}
.topic-detail h2{margin:0 0 4px;font-size:22px}
.topic-detail .sub{color:var(--ink-3);font-size:13px;margin-bottom:14px}
.topic-detail h4{margin:18px 0 6px;font-size:14px;color:var(--primary)}
.topic-detail p{margin:4px 0;color:var(--ink-2);font-size:14px}
.deps-list{list-style:none;padding:0;margin:0}
.deps-list li{padding:6px 0;border-bottom:1px dashed var(--line);font-size:14px}
.deps-list li:last-child{border-bottom:none}
.deps-list a{font-weight:600}
.strength{font-size:11px;padding:1px 7px;border-radius:999px;margin-left:6px}
.strength.hard{background:#fee2e2;color:#b91c1c}
.strength.soft{background:#fef3c7;color:#b45309}
.empty-hint{color:var(--ink-3);text-align:center;padding:60px 10px;font-size:14px}

/* bank page */
.q-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-bottom:12px}
.q-head{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:8px}
.q-prompt{font-size:15px;white-space:pre-wrap}
.q-ans{margin-top:12px;border-top:1px dashed var(--line);padding-top:10px;font-size:14px}
.q-ans .ans{color:var(--ok);font-weight:600;white-space:pre-wrap}
.q-ans .exp{color:var(--ink-2);margin-top:4px;white-space:pre-wrap}
.toggle-ans{margin-top:10px;font-size:13px;color:var(--primary);background:none;border:none;cursor:pointer;padding:0}

/* 全题回顾（诊断/冲刺/练习结果页） */
.rv-sum{font-size:13px;font-weight:500;margin-left:10px}
.rv-sum .v-ok{color:var(--ok)}
.rv-sum .v-bad{color:#dc2626}
.q-card.q-ok{border-left:4px solid var(--ok)}
.q-card.q-bad{border-left:4px solid #dc2626}
.chip.q-no{background:var(--ink);color:#fff;font-weight:600}
.chip.q-verdict{font-weight:600;margin-left:auto}
.chip.q-verdict.v-ok{background:var(--primary-weak);color:var(--ok)}
.chip.q-verdict.v-bad{background:#fee2e2;color:#dc2626}
.q-opts{margin:2px 0 8px;display:flex;flex-direction:column;gap:6px}
.q-opt{padding:8px 12px;border:1px solid var(--line);border-radius:10px;font-size:14px;display:flex;gap:6px;align-items:baseline;flex-wrap:wrap}
.q-opt.opt-right{border-color:var(--ok);background:#f0fdf4}
.q-opt.opt-wrong{border-color:#fca5a5;background:#fef2f2}
.opt-tag{font-size:12px;font-weight:600;margin-left:auto;flex:none}
.opt-tag.t-right{color:var(--ok)}
.opt-tag.t-wrong{color:#dc2626}

/* 试卷批改特效 */
#grade-mask{position:fixed;inset:0;z-index:300;background:rgba(15,23,42,.58);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:16px;opacity:1;transition:opacity .22s}
#grade-mask.fade{opacity:0}
.grade-paper{background:#fff;color:#1e293b;width:min(680px,100%);max-height:88vh;overflow:auto;border-radius:10px;padding:26px 30px 20px;box-shadow:0 24px 60px rgba(0,0,0,.4);position:relative;transform:rotate(-.4deg)}
.grade-paper::before{content:'';position:absolute;top:0;left:0;right:0;height:6px;background:#b91c1c;border-radius:10px 10px 0 0}
.gp-seal{position:absolute;top:64px;left:-6px;transform:rotate(-90deg);transform-origin:left top;font-size:11px;color:#94a3b8;letter-spacing:.3em;white-space:nowrap}
.gp-head{border-bottom:3px double #b91c1c;padding:10px 0 12px;margin-bottom:14px;text-align:center}
.gp-title{font-size:19px;font-weight:800;letter-spacing:.06em;color:#0f172a}
.gp-meta{display:flex;justify-content:center;gap:22px;margin-top:8px;font-size:13px;color:#475569}
.gp-list{display:flex;flex-direction:column;gap:7px;min-height:120px}
.gr-row{display:flex;align-items:center;gap:10px;padding:7px 12px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;font-size:13px;opacity:0;transform:translateX(-14px);transition:opacity .22s,transform .22s}
.gr-row.in{opacity:1;transform:none}
.gr-idx{flex:none;width:22px;height:22px;border-radius:50%;background:#0f172a;color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;font-weight:700}
.gr-row.bad .gr-idx{background:#dc2626}
.gr-text{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#334155}
.gr-mark{flex:none;font-size:19px;font-weight:900;opacity:0}
.gr-row.in .gr-mark{animation:stampIn .34s cubic-bezier(.2,1.4,.4,1) both}
.gr-row.ok .gr-mark{color:var(--ok)}
.gr-row.bad .gr-mark{color:#dc2626}
@keyframes stampIn{0%{transform:scale(2.6) rotate(-24deg);opacity:0}55%{transform:scale(.9) rotate(-10deg);opacity:1}100%{transform:scale(1) rotate(-10deg);opacity:1}}
.gp-final{margin-top:14px;text-align:center;border-top:1px dashed #cbd5e1;padding:14px 0 6px;font-size:15px;color:#334155;animation:gpPop .4s ease-out both}
.gp-final b{font-size:52px;font-weight:900;color:#b91c1c;line-height:1;margin:0 4px}
.gp-final .gp-total{color:#64748b;font-size:17px;font-weight:700}
.gp-final .gp-pct{display:block;margin-top:6px;font-size:13px;color:#64748b}
@keyframes gpPop{from{transform:scale(.86);opacity:0}to{transform:scale(1);opacity:1}}
.gp-actions{display:flex;gap:10px;justify-content:center;margin-top:14px}
.gp-hint{text-align:center;font-size:12px;color:#94a3b8;margin-top:8px}

/* 打印：只留试卷内容 */
@media print{
  .site-head,#site-footer,.manual-row,.mode-strip,.gp-actions,#grade-mask,.btn{display:none!important}
  body{background:#fff!important}
  .wrap{max-width:none;margin:0;padding:0}
  .diag-card,.q-card{box-shadow:none!important;border:1px solid #cbd5e1!important;break-inside:avoid;page-break-inside:avoid}
  .section-title{break-after:avoid}
  .result-head{border:2px solid #0f172a}
}

.note-card{background:var(--primary-weak);border:1px solid var(--primary-soft);border-radius:var(--radius);padding:18px 22px;margin-top:36px}
.note-card h3{margin:0 0 6px;font-size:15px;color:var(--primary)}
.note-card p{margin:0;font-size:13.5px;color:var(--ink-2)}

/* 学习树 */
.legend-bar{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:8px 0 4px}
.legend{display:inline-flex;align-items:center;gap:5px;font-size:13px;color:var(--ink-2)}
.legend-hint{font-size:12px;color:var(--ink-3);margin-left:auto}
.dot{display:inline-block;width:11px;height:11px;border-radius:50%;flex:none}
.dot-red{background:#dc2626}
.dot-yellow{background:#d97706}
.dot-green{background:#16a34a}

.tree-vol,.tree-chap{margin-bottom:10px}
.tree-head{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:11px 16px;cursor:pointer;font-weight:600;display:flex;align-items:center;gap:8px}
.tree-head:hover{border-color:var(--primary)}
.tree-head.chap{margin:8px 0 0;padding:9px 14px;font-weight:500;font-size:14.5px;background:var(--primary-weak);border-color:var(--primary-soft)}
.tree-head .caret{color:var(--ink-3);font-size:12px}
.head-stat{margin-left:auto;font-size:12px;color:var(--ink-3);font-weight:400}
.tree-children{padding:8px 0 0 22px}
.tree-children[hidden]{display:none}
.tree-node{display:flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--line);border-radius:9px;padding:9px 14px;margin-bottom:6px;cursor:pointer}
.tree-node:hover{border-color:var(--primary)}
.node-name{flex:1;font-size:14.5px}
.node-btn{font-size:12px;padding:4px 12px;border-radius:999px;border:1px solid var(--primary);background:var(--primary-weak);color:var(--primary);cursor:pointer}
.node-btn:hover{background:var(--primary);color:#fff}

/* 练习弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:50;display:flex;align-items:center;justify-content:center;padding:20px}
.modal-mask[hidden]{display:none}
.modal{background:var(--card);border-radius:16px;max-width:640px;width:100%;max-height:85vh;overflow:auto;padding:22px 26px}
.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:17px}
.modal-close{border:none;background:none;font-size:16px;cursor:pointer;color:var(--ink-3)}
.p-progress{font-size:13px;color:var(--ink-3);margin-bottom:10px}
.p-desc{color:var(--ink-2);font-size:14px}
.p-crit{color:var(--ink-3);font-size:12.5px;margin-top:12px}
.manual-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}

/* 做题交互 */
.opt-list{margin-top:12px}
.opt-btn{display:block;width:100%;text-align:left;padding:11px 15px;border:1px solid var(--line);border-radius:10px;background:var(--card);margin-bottom:8px;cursor:pointer;font-size:14.5px;color:var(--ink)}
.opt-btn:hover:not(:disabled){border-color:var(--primary);background:var(--primary-weak)}
.opt-btn.right{border-color:var(--ok);background:#ecfdf5;color:#065f46}
.opt-btn.wrong{border-color:#dc2626;background:#fef2f2;color:#991b1b}
.opt-btn:disabled{cursor:default}
.fb{margin-top:10px;padding:11px 15px;border-radius:10px;font-size:14px}
.fb.ok{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.fb.bad{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.fb .exp{margin-top:6px;color:inherit;opacity:.85;font-size:13.5px}
.fill-row{display:flex;gap:8px;margin-top:12px}
.next-btn{display:block;margin-left:auto;margin-top:10px}
.finish-box{text-align:center;padding:16px 0}
.finish-big{font-size:20px;font-weight:700;margin-bottom:8px}
.finish-box p{color:var(--ink-2);margin:6px 0}

/* footer */
.site-foot{border-top:1px solid var(--line);margin-top:60px;padding:24px 20px;text-align:center;color:var(--ink-3);font-size:13px}
/* 内部入口：管理员/员工，刻意做得很淡，不吸引家长注意 */
.site-foot .foot-ops{opacity:.4;font-size:11.5px;letter-spacing:.02em}
.site-foot .foot-ops a{color:inherit;text-decoration:none;border-bottom:1px dotted transparent}
.site-foot .foot-ops a:hover,.site-foot .foot-ops a:focus-visible{opacity:1;text-decoration:none;border-bottom-color:currentColor}

/* AI生成内容显式标识（《人工智能生成合成内容标识办法》合规） */
.ai-tag{display:inline-block;font-size:10.5px;line-height:1;padding:3px 6px;border-radius:5px;border:1px solid #93c5fd;color:#1d4ed8;background:#eff6ff;vertical-align:1px;margin-left:4px;font-weight:600}
.exp .ai-tag{margin-right:2px}

/* ---------- 账号系统 ---------- */
.btn-sm{padding:6px 14px;font-size:13px;border-radius:8px}

/* 诊断CTA动画按钮 v4：流动渐变 + 轻呼吸光晕（去掉流光/波纹/箭头摆动） */
.btn-cta{
  position:relative;overflow:visible;font-size:18px;font-weight:800;letter-spacing:.04em;
  padding:17px 44px;border-radius:999px;border:none;color:#fff;cursor:pointer;
  text-shadow:0 1px 3px rgba(124,45,18,.4);
  background:linear-gradient(120deg,#f97316,#fbbf24,#fb923c,#f97316);
  background-size:300% 100%;
  box-shadow:0 8px 30px rgba(249,115,22,.6);
  animation:cta-flow 3.6s linear infinite, cta-pulse 2.4s ease-in-out infinite;
  transition:transform .25s cubic-bezier(.34,1.8,.5,1), box-shadow .25s ease, filter .25s ease;
}
.btn-cta:hover{
  transform:translateY(-4px) scale(1.07);
  text-decoration:none;color:#fff;
  box-shadow:0 14px 44px rgba(251,146,60,.95),0 0 0 6px rgba(251,146,60,.25);
  filter:brightness(1.08);
}
.btn-cta:active{transform:translateY(-1px) scale(1.01)}
@keyframes cta-flow{
  0%{background-position:0% 50%}
  100%{background-position:300% 50%}
}
@keyframes cta-pulse{
  0%,100%{box-shadow:0 8px 26px rgba(249,115,22,.5)}
  50%{box-shadow:0 12px 44px rgba(251,146,60,.9),0 0 0 8px rgba(251,146,60,0)}
}
.btn-cta .cta-arrow{display:inline-block;margin-left:8px}
/* 待选年级态：橙色变暗但仍流动，上方浮动提示条 */
.btn-cta.waiting,.btn-cta:disabled{filter:saturate(.55) brightness(.75);cursor:not-allowed}
.btn-cta.waiting:hover,.btn-cta:disabled:hover{transform:none;filter:saturate(.55) brightness(.75)}
.cta-hint{
  position:absolute;left:50%;top:-36px;transform:translateX(-50%);
  background:rgba(30,20,10,.92);color:#fdba74;font-size:12.5px;font-weight:600;
  padding:5px 14px;border-radius:99px;white-space:nowrap;pointer-events:none;
  border:1px solid rgba(253,186,116,.4);
  animation:cta-hint-bob 1.6s ease-in-out infinite;
}
.cta-hint::after{content:'';position:absolute;left:50%;bottom:-5px;transform:translateX(-50%);
  border:5px solid transparent;border-top-color:rgba(30,20,10,.92);border-bottom:none}
@keyframes cta-hint-bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,-5px)}}
.site-head .inner{gap:12px}
.child-switch{display:flex;align-items:center;gap:6px;margin-left:4px;flex-wrap:wrap}
.child-pill{padding:5px 12px;border-radius:99px;border:1.5px solid var(--line);background:var(--card);font-size:13px;color:var(--ink-2);cursor:pointer}
.child-pill.on{background:var(--grad);border-color:transparent;color:#fff;font-weight:600}
.child-pill.add{border-style:dashed;color:var(--primary);text-decoration:none}
.head-link{background:none;border:none;padding:6px 8px;font-size:13px;color:var(--ink-2);cursor:pointer;text-decoration:none}
.head-link:hover{color:var(--primary)}

.mode-strip{max-width:1080px;margin:14px auto 0;padding:9px 16px;border-radius:10px;background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;font-size:13.5px}
.mode-strip.warn{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.mode-strip a{color:var(--primary);font-weight:600}

/* 登录页 */
.auth-wrap{max-width:440px;margin:48px auto 0}
.auth-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:0 8px 30px rgba(0,0,0,.05)}
.auth-tabs{display:flex;gap:6px;margin-bottom:20px;background:var(--bg);border-radius:10px;padding:4px}
.auth-tabs button{flex:1;padding:8px;border:none;border-radius:8px;background:none;font-size:14px;color:var(--ink-2);cursor:pointer}
.auth-tabs button.on{background:var(--card);font-weight:600;color:var(--primary);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.auth-form label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:12px}
.auth-form .input{width:100%;margin-top:4px}
.auth-form .btn{width:100%}
.form-err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;font-size:13px;border-radius:8px;padding:8px 12px;margin-bottom:12px}
.auth-hint{color:var(--ink-3);font-size:12.5px;line-height:1.6}
.guest-line{text-align:center;margin-top:16px;font-size:13.5px;color:var(--ink-2)}

/* 家长中心 */
.kids-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.kid-card{border:1.5px solid var(--line);border-radius:14px;padding:16px;background:var(--bg)}
.kid-card.on{border-color:var(--primary);background:var(--card);box-shadow:0 4px 16px rgba(234,88,12,.1)}
.kid-card.add{display:flex;flex-direction:column;justify-content:center;gap:4px}
.kid-head{display:flex;align-items:center;gap:8px;margin-bottom:10px;font-size:16px}
.kid-stats{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}
.kid-stats .ks{font-size:13px;color:var(--ink-2)}
.kid-actions{display:flex;gap:8px;flex-wrap:wrap}

/* 题库游客锁 */
.lock-box{text-align:center;background:var(--card);border:1.5px dashed #fdba74;border-radius:16px;padding:36px 24px;margin:10px 0 20px}
.lock-icon{font-size:40px;margin-bottom:8px}
.lock-box h3{margin:0 0 8px;font-size:18px}
.lock-box p{color:var(--ink-2);font-size:14px;max-width:460px;margin:0 auto 18px}
.lock-preview{opacity:.9}
.q-card.blurred{filter:blur(6px);user-select:none;pointer-events:none}
.input:focus{outline:2px solid #fdba74;border-color:var(--primary)}

/* 诊断页模式选择卡片 */
.mode-cards{display:flex;gap:14px;margin:4px 0 6px;flex-wrap:wrap}
.mode-card{flex:1;min-width:240px;text-align:left;background:var(--card);border:2px solid var(--line);border-radius:14px;padding:16px 18px;cursor:pointer;font-family:inherit;transition:all .15s;position:relative}
.mode-card:hover{border-color:var(--primary-soft);box-shadow:0 4px 16px rgba(234,88,12,.10);transform:translateY(-1px)}
.mode-card.on{border-color:var(--primary);background:linear-gradient(180deg,#fff, var(--primary-weak));box-shadow:0 4px 16px rgba(234,88,12,.14)}
.mode-card .mc-icon{font-size:22px;margin-right:8px}
.mode-card b{font-size:15.5px;color:var(--ink)}
.mode-card .mc-desc{display:block;font-size:13px;color:var(--ink-2);margin-top:6px;line-height:1.55}
.mode-card .mc-tag{position:absolute;top:12px;right:12px;font-size:11px;padding:2px 9px;border-radius:999px;background:var(--primary-weak);color:var(--primary);font-weight:600}
.mode-card .mc-tag.lock{background:#f1f5f9;color:#64748b}
.mode-card.on .mc-tag{background:var(--grad);color:#fff}
.mode-hint{font-size:13px;color:#dc2626;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:8px 12px;margin-top:10px}
.btn-ghost-dl{background:#fff;border:1.5px solid var(--primary-soft);color:var(--primary)}
.btn-ghost-dl:hover{background:var(--primary-weak)}

/* ============ 移动端适配：≤640px 手机 ============ */
@media (max-width:640px){
  /* 头部压缩：品牌+登录一行，导航横滑 */
  .site-head .inner{gap:8px;padding:8px 14px;flex-wrap:wrap}
  .site-head .btn-sm{margin-left:auto}
  .site-head .child-switch{margin-left:auto}
  .brand{font-size:16px}
  .logo-img{width:28px;height:28px;border-radius:8px}
  .site-head .btn-sm{padding:7px 12px;font-size:13px;border-radius:8px}
  .site-nav{order:3;width:100%;margin-left:0;overflow-x:auto;gap:2px;padding-bottom:2px;-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-wrap:nowrap}
  .site-nav::-webkit-scrollbar{display:none}
  .site-nav a{padding:6px 12px;font-size:13.5px;white-space:nowrap;flex:0 0 auto}
  /* 手机端「更多」放第一行右侧，登录按钮紧随其后 */
  .nav-more{order:2;margin-left:auto}
  .nav-more-btn{padding:6px 11px;font-size:13.5px}
  /* 手机端学习闭环：隐藏箭头，芯片左对齐换行 */
  .flow-strip{justify-content:flex-start;gap:7px}
  .fs-arrow{display:none}
  .fs-step{padding:8px 12px;font-size:12.5px}
  .site-head .btn-sm{margin-left:6px}
  .site-head .child-switch{margin-left:6px}
  .child-switch{gap:6px}
  .child-pill{font-size:12.5px;padding:5px 10px}
  .cmp-wrap{display:none!important}
  .cmp-cards{display:grid!important;gap:10px}

  .container{padding:0 14px 48px}
  .page-head{margin:20px 0 12px}
  .page-head h1{font-size:23px}
  .lede{font-size:14.5px;margin-bottom:18px}
  .section-title{font-size:18px;margin:26px 0 12px}

  /* hero：紧凑排版，按钮竖排大触摸区 */
  .hero{padding:28px 16px 26px;border-radius:18px;margin-top:14px}
  .hero h1{font-size:25px;margin-bottom:10px}
  .hero .lede{font-size:14px;margin-bottom:18px}
  .hs-subjects{gap:8px}
  .subj-tab{padding:7px 16px;font-size:14px}
  .grade-row{gap:6px;margin-bottom:8px}
  .grade-pill.big{font-size:12.5px;padding:6px 12px}
  .grade-pill.big i{font-size:10.5px}
  .stage-tag.light{font-size:12px}
  .hero-actions{flex-direction:column;gap:10px;margin-top:20px}
  .hero-actions > *{width:100%;text-align:center}
  .btn-cta{font-size:16.5px;padding:15px 26px}
  .hero .btn{min-height:50px;padding:12px 20px;font-size:15px}

  /* 诊断页模式卡片竖排 */
  .mode-cards{flex-direction:column;gap:10px}
  .mode-card{min-width:0;padding:14px 16px}
  .diag-card{padding:18px 16px;border-radius:14px}
  .opt-btn{padding:12px 14px;font-size:14.5px}
  .q-prompt{font-size:15px}

  /* 结果页 */
  .result-head{gap:14px}
  .score-ring{width:96px;height:96px}
  .score-ring b{font-size:26px}
  .result-sum h2{font-size:19px}
  .result-sum .manual-row{flex-direction:column}
  .result-sum .manual-row > *{width:100%;text-align:center}
  .chap-stat-row{padding:9px 12px;gap:8px}
  .cs-name{font-size:13px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

  /* 题库/题卡 */
  .q-card{padding:14px 14px}
  .toolbar{gap:8px}
  .toolbar .input{min-width:0}
  .toolbar .input.grow{flex:1 1 100%}
  .toolbar select.input{flex:1 1 44%}

  /* 数据总览两列 */
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .stat-card{padding:14px 10px}
  .stat-num{font-size:24px}
}
/* ============ 平板：641-820px ============ */
@media (min-width:641px) and (max-width:820px){
  .site-head .inner{padding:10px 16px;gap:12px}
  .site-nav a{padding:6px 10px;font-size:13.5px}
  .hero{padding:38px 24px 34px}
  .hero h1{font-size:30px}
  .mode-card{min-width:200px}
}

/* ============ 知识地图（地铁图风格） ============ */
.view-toggle{display:inline-flex;gap:0;background:#fff;border:1px solid var(--line);border-radius:999px;padding:3px;margin-bottom:8px}
.view-toggle button{border:none;background:none;font-family:inherit;font-size:13.5px;padding:7px 18px;border-radius:999px;cursor:pointer;color:var(--ink-2);transition:all .15s}
.view-toggle button.on{background:var(--grad);color:#fff;font-weight:700;box-shadow:0 2px 8px rgba(234,88,12,.3)}

.kmap{display:flex;gap:14px;margin-top:6px}
.kmap-trunk{position:relative;width:58px;flex:none}
.kmap-trunk::before{content:'';position:absolute;left:26px;top:56px;bottom:8px;width:6px;border-radius:3px;background:var(--grad);opacity:.9}
.kt-badge{position:sticky;top:70px;z-index:2;width:52px;height:52px;margin-left:2px;border-radius:16px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;box-shadow:0 4px 14px rgba(234,88,12,.35)}
.kmap-lines{flex:1;min-width:0;display:flex;flex-direction:column;gap:14px}
.kv-name{font-size:13.5px;font-weight:800;color:var(--primary);margin:2px 0 -4px;padding-left:2px}
.kmap-branch{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px 4px;margin-bottom:2px}
.kb-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:2px}
.kb-name{font-size:13.5px;font-weight:700}
.kb-stat{font-size:11.5px;color:var(--ink-3);white-space:nowrap}
.kb-line{position:relative;display:flex;align-items:flex-start;gap:4px;overflow-x:auto;padding:8px 2px 12px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.kb-line::-webkit-scrollbar{display:none}
.kb-track{position:absolute;left:14px;right:14px;top:15px;height:3px;border-radius:2px;background:var(--line)}
.kstation{position:relative;flex:none;width:92px;display:flex;flex-direction:column;align-items:center;gap:5px;background:none;border:none;cursor:pointer;font-family:inherit;padding:0}
.ks-dot{width:16px;height:16px;border-radius:50%;border:3px solid #fff;box-shadow:0 1px 5px rgba(0,0,0,.2);background:var(--ink-3);transition:transform .15s}
.kstation:hover .ks-dot{transform:scale(1.3)}
.s-green .ks-dot{background:var(--ok)}
.s-yellow .ks-dot{background:#f59e0b}
.s-red .ks-dot{background:#ef4444}
.ks-name{font-size:12.5px;line-height:1.3;color:var(--ink-2);max-height:2.7em;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.kstation:hover .ks-name{color:var(--primary)}
.kmap-legend{font-size:12.5px;color:var(--ink-3);margin-top:10px}
@media (max-width:640px){
  .kmap{gap:8px}
  .kmap-trunk{width:44px}
  .kmap-trunk::before{left:19px;top:50px}
  .kt-badge{width:42px;height:42px;font-size:12.5px;border-radius:13px;margin-left:0}
  .kstation{width:78px}
  .kmap-branch{padding:8px 10px 2px}
}

/* ============ 推广二维码生成器 ============ */
.qr-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.qr-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;text-align:center;box-shadow:0 2px 10px rgba(234,88,12,.05)}
.qr-card canvas{width:230px;height:230px;border-radius:10px;border:1px solid var(--line)}
.qr-code{font-weight:800;color:var(--primary);font-size:15px;margin-top:8px}
.qr-url{font-size:11.5px;color:var(--ink-3);word-break:break-all;margin:4px 0 10px;line-height:1.4}
@media (max-width:640px){.qr-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}.qr-card canvas{width:160px;height:160px}.qr-card .qr-url{display:none}}
@media print{
  .site-head,.site-head::after,#site-footer,.page-head,.lede,.diag-card,.manual-row,.meta-line{display:none!important}
  body{background:#fff}
  .qr-grid{display:grid!important;grid-template-columns:repeat(2,1fr)!important;gap:10mm}
  .qr-card{border:1.5px dashed #bbb;box-shadow:none;break-inside:avoid;page-break-inside:avoid}
  .qr-card .manual-row{display:none}
  .qr-card canvas{width:70mm;height:70mm}
}

/* ============ 验证码登录 ============ */
.sms-row{display:flex;gap:8px;width:100%}
.sms-row .input{flex:1 1 auto;width:auto;min-width:0}
.sms-row .btn{flex:none;width:auto;white-space:nowrap;padding:9px 14px;font-size:13.5px}
.sms-row .btn:disabled{opacity:.5}
.sms-demo{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;border-radius:8px;padding:8px 12px;font-size:13px;margin:-2px 0 4px}

/* ============ 布置作业（作业卷生成） ============ */
.lede-sm{color:var(--ink-2);font-size:14.5px;margin:-6px 0 16px}
/* 双模式页签：随机组卷 / 按知识点选题 */
.mode-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 14px}
.mode-tab{flex:1 1 240px;display:flex;flex-direction:column;align-items:flex-start;gap:2px;background:var(--card);border:1.5px solid var(--line);border-radius:var(--radius);padding:12px 16px;font-size:15px;font-weight:700;color:var(--ink);cursor:pointer;text-align:left;font-family:inherit;transition:border-color .15s,box-shadow .15s}
.mode-tab small{font-weight:400;font-size:12px;color:var(--ink-3)}
.mode-tab:hover{border-color:var(--primary)}
.mode-tab.active{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-weak);color:var(--primary)}
/* 随机组卷：单元速览条 */
.unit-strip{font-size:12.5px;color:var(--ink-2);line-height:1.7;background:var(--primary-weak);border-radius:10px;padding:9px 12px;margin:-4px 0 14px}
.paper-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:14px}
.pp-field{display:flex;align-items:center;gap:6px;font-size:13.5px;color:var(--ink-2)}
.pp-field .input{width:auto;min-width:96px;padding:7px 10px}
.pp-check{gap:8px;cursor:pointer}
.pp-check input{width:16px;height:16px;accent-color:var(--primary)}
.pp-picker{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:18px}
.pp-picker-head{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}
.pp-topic-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:6px 14px;max-height:260px;overflow:auto}
.pp-topic{display:flex;align-items:center;gap:8px;font-size:13.5px;padding:5px 6px;border-radius:8px;cursor:pointer}
.pp-topic:hover{background:var(--primary-weak)}
.pp-topic input{width:15px;height:15px;accent-color:var(--primary);flex:none}
.pp-topic-name{flex:1 1 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pp-topic-n{color:var(--ink-3);font-size:12px;flex:none}
.pp-toolbar{display:flex;align-items:center;gap:10px;margin:6px 0 14px}

.paper-sheet{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px 36px;box-shadow:0 2px 14px rgba(234,88,12,.06)}
.pp-head{text-align:center;border-bottom:2px solid var(--ink);padding-bottom:12px;margin-bottom:20px}
.pp-head h2{margin:0 0 8px;font-size:20px;letter-spacing:.04em}
.pp-meta{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;font-size:13.5px;color:var(--ink-2)}
.pp-sec{margin-bottom:22px}
.pp-sec h3{font-size:15px;margin:0 0 10px;padding-left:8px;border-left:3px solid var(--primary)}
.pp-q{margin:0 0 14px;break-inside:avoid;page-break-inside:avoid}
.pp-q-head{display:flex;align-items:center;gap:8px}
.pp-no{font-weight:700;font-size:14px}
.pp-stars{font-size:11.5px;color:var(--primary);letter-spacing:-1px}
.pp-prompt{font-size:14.5px;margin:2px 0 0 22px;line-height:1.7}
.pp-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2px 18px;margin:6px 0 0 22px;font-size:14px}
.pp-opt{color:var(--ink-2)}
.pp-blank{margin:8px 0 0 22px;color:var(--ink-3);font-size:13.5px}
.pp-lines{margin:8px 0 0 22px}
.pp-lines i{display:block;border-bottom:1px dashed var(--line);height:24px}

.paper-key{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-top:18px}
.paper-key h3{margin:0 0 12px;font-size:16px;color:var(--primary)}
.pk-sec h4{margin:12px 0 6px;font-size:13.5px;color:var(--ink-2)}
.pk-list{margin:0;padding-left:22px;font-size:13.5px;line-height:1.9}
.pk-exp{color:var(--ink-3);font-size:12.5px}

@media print{
  .site-head,.site-head::after,#site-footer,.page-head,.lede-sm,.paper-toolbar,.pp-picker,.pp-toolbar,.mode-strip,.mode-tabs,.unit-strip{display:none!important}
  body{background:#fff;background-image:none}
  .container{max-width:none;padding:0}
  .paper-sheet{border:0;box-shadow:none;padding:0;border-radius:0}
  .paper-key{border:0;border-top:1.5px dashed #999;border-radius:0;padding:14px 0 0;margin-top:14px;break-before:page;page-break-before:always}
  .pp-sec h3{border-left-color:#333}
  .pp-stars{color:#666}
}

/* ============ 在线做题 / 作业汇总 ============ */
.qz-q{margin:0 0 18px}
.qz-head{display:flex;align-items:center;gap:8px}
.qz-prompt{font-size:15px;margin:2px 0 8px 22px;line-height:1.75}
.qz-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:4px 16px;margin-left:22px}
.qz-opt{display:flex;align-items:baseline;gap:8px;font-size:14.5px;padding:6px 8px;border-radius:8px;cursor:pointer;border:1px solid transparent}
.qz-opt:hover{background:var(--primary-weak)}
.qz-opt input{accent-color:var(--primary);margin:0}
.qz-input{margin-left:22px;max-width:420px;width:calc(100% - 22px)}
textarea.qz-input{max-width:100%}

.qz-score{display:flex;align-items:baseline;gap:6px;margin:6px 0 4px}
.qz-score b{font-size:44px;line-height:1;color:var(--primary)}
.qz-score span{color:var(--ink-3);font-size:14px}
.qz-h4{margin:18px 0 8px;font-size:14.5px;color:var(--ink)}
.qz-wrong-topic{margin:0;padding-left:20px;font-size:14px;line-height:1.9}
.qz-review{border-left:3px solid var(--primary-soft);padding:2px 0 6px 12px;margin:0 0 12px;font-size:14px}
.qz-rv-q{font-weight:600;margin-bottom:4px}
.qz-rv-line{color:var(--ink-2);font-size:13.5px}
.qz-rv-line .bad{color:#dc2626;font-weight:600}
.qz-rv-line .ok{color:var(--ok);font-weight:600}
.qz-rv-exp{color:var(--ink-3);font-size:12.5px;margin-top:2px}
.qz-code-row{display:flex;gap:10px;align-items:flex-start}
.qz-code{flex:1 1 auto;font-family:ui-monospace,Consolas,monospace;font-size:12px;line-height:1.5;word-break:break-all}

.qz-table-wrap{overflow:auto}
.qz-table{width:100%;border-collapse:collapse;font-size:13.5px}
.qz-table th,.qz-table td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;white-space:nowrap}
.qz-table th{background:var(--primary-weak);font-weight:600;color:var(--ink-2)}
.qz-table tbody tr:hover{background:#fffaf5}
.stat-card b{display:block;font-size:26px;line-height:1.2;color:var(--primary)}
.stat-card span{font-size:12.5px;color:var(--ink-3)}

/* 作业卷抬头右侧二维码 */
.pp-head-qr{display:flex;align-items:center;justify-content:space-between;gap:18px;text-align:left}
.pp-head-main{flex:1 1 auto;text-align:center}
.pp-head-qr .pp-meta{justify-content:center}
.pp-qr{flex:none;text-align:center;font-size:11px;color:var(--ink-3);line-height:1.3}
.pp-qr canvas{display:block;width:96px;height:96px}
@media print{
  .pp-qr{display:block!important}
  .pp-qr canvas{width:80px;height:80px}
}

/* ---------- 登录 Tab / 管理后台 ---------- */
.tab-btn.on { border-color: var(--brand); color: var(--brand); background: var(--brand-soft, #eef2ff); }
.grant-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px 14px; }
.grant-form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted, #6b7280); }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line, #e5e7eb); white-space: nowrap; }
.admin-table th { color: var(--muted, #6b7280); font-weight: 600; font-size: 12px; }
.admin-table .ops { display: flex; gap: 6px; }
.admin-table .note-cell { max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.form-ok { margin-top: 10px; padding: 10px 12px; border-radius: 10px; background: #ecfdf5; color: #047857; font-size: 13px; }

/* ---------- 会员中心 ---------- */
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:24px 0}
.price-card{position:relative;background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:22px 20px;display:flex;flex-direction:column;gap:8px}
.price-card.hot{border-color:var(--primary);box-shadow:0 6px 24px rgba(234,88,12,.14)}
.price-card h3{font-size:18px;margin:0}
.price-num{font-size:36px;font-weight:800;color:var(--primary)}
.price-num span{font-size:14px;font-weight:500;color:var(--ink-3);margin-left:4px}
.price-desc{color:var(--ink-2);font-size:13px;margin:0 0 6px}
.price-card ul{list-style:none;margin:0 0 14px;padding:0;display:flex;flex-direction:column;gap:6px;flex:1}
.price-card li{font-size:14px;color:var(--ink-2);padding-left:22px;position:relative}
.price-card li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:700}
.price-tag{position:absolute;top:-11px;right:14px;background:var(--grad);color:#fff;font-size:12px;padding:3px 10px;border-radius:999px}
.cmp-table{width:100%;border-collapse:collapse;background:var(--card);border-radius:12px;overflow:hidden;font-size:14px;min-width:520px}
.cmp-table th,.cmp-table td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:center}
.cmp-table th:first-child,.cmp-table td:first-child{text-align:left}
.cmp-table th{background:var(--primary-weak);color:var(--ink);font-size:13px}
.cmp-table .hot-col{color:var(--primary);font-weight:700}
/* 权益对比：手机端改卡片式，避免右列被截断 */
.cmp-cards{display:none}
.cmp-card{background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px}
.cmp-card-t{font-weight:700;font-size:14.5px;margin-bottom:8px}
.cmp-card-row{display:flex;justify-content:space-between;gap:10px;padding:5px 0;font-size:13.5px;color:var(--ink-2);border-top:1px dashed var(--line)}
.cmp-card-row:first-of-type{border-top:0}
.cmp-card-row b{color:var(--ink);font-weight:600}
.cmp-card-row.hot b{color:var(--primary)}
.grant-bar{background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:14px 18px;font-size:14px;color:var(--ink-2);margin-top:18px}
.grant-bar.ok{border-color:var(--ok);background:#ecfdf5;color:var(--ink)}
.grant-bar a{color:var(--primary);font-weight:600}
.pay-note{background:var(--primary-weak);border-radius:14px;padding:18px 20px;font-size:14px;line-height:1.8;margin:22px 0;min-height:20px}
.pay-note code{background:#fff;padding:2px 10px;border-radius:8px;font-weight:700;color:var(--primary);cursor:pointer}

/* 题目报错入口 */
.repair-link{margin-top:10px;padding:6px 12px;border:1px dashed var(--line);background:transparent;color:var(--ink-3);font-size:12px;border-radius:8px;cursor:pointer}
.repair-link:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- 导航重点标记 ---------- */
.site-nav a{position:relative;font-weight:500;letter-spacing:.01em;transition:color .15s,background .15s}
.site-nav a.nav-hot{color:var(--primary);font-weight:700}
.site-nav a.nav-hot:hover{color:#c2410c}
.site-nav a.nav-hot.active{color:#fff}
.site-nav a.nav-new{font-weight:600}
.site-nav a.nav-new.active{color:#fff}
.nav-badge{position:absolute;top:-7px;right:-6px;font-style:normal;font-size:10px;font-weight:700;line-height:1;padding:3px 5px;border-radius:999px;color:#fff;letter-spacing:0;box-shadow:0 1px 4px rgba(0,0,0,.18)}
.nav-badge.hot{background:linear-gradient(135deg,#f43f5e,#fb7185)}
.nav-badge.new{background:linear-gradient(135deg,#0ea5e9,#38bdf8)}
.site-nav a.active .nav-badge{background:#fff;color:var(--primary);box-shadow:0 1px 4px rgba(0,0,0,.22)}

/* ---------- 全局排版美化 ---------- */
body{-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4{line-height:1.35;letter-spacing:.01em;color:var(--ink);font-weight:800}
h1{font-size:28px;margin:26px 0 10px}
h2{font-size:22px;margin:24px 0 10px}
h3{font-size:17px;margin:18px 0 8px}
p{line-height:1.75;margin:8px 0}
.container>p{color:var(--ink-2)}
b,strong{font-weight:700}
::selection{background:var(--primary-soft);color:#7c2d12}
:focus-visible{outline:2.5px solid var(--primary);outline-offset:2px;border-radius:4px}
.btn{font-weight:600;letter-spacing:.01em}
table{line-height:1.6}
@media (max-width:720px){
  h1{font-size:24px}h2{font-size:20px}
  .nav-badge{top:-4px;right:-6px;font-size:9px;padding:2px 4px}
}

/* ---------- 批改页选卷卡片 ---------- */
.paper-picks{display:flex;flex-direction:column;gap:10px;margin:12px 0}
.paper-pick{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:13px 16px;cursor:pointer;transition:border-color .15s,box-shadow .15s}
.paper-pick:hover{border-color:var(--primary);box-shadow:0 3px 14px rgba(234,88,12,.12)}
.paper-pick .pp-ico{font-size:22px;flex:none}
.paper-pick .pp-main{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}
.paper-pick .pp-main b{font-size:14.5px}
.paper-pick .pp-main .meta-line{font-size:12px;margin:0}
.paper-pick .pp-code{flex:none;font-size:12px;color:var(--ink-2);background:var(--primary-weak);padding:4px 9px;border-radius:8px}
.paper-pick .pp-code b{color:var(--primary);font-size:13px;letter-spacing:.06em}
.paper-pick .pp-go{flex:none;color:var(--primary);font-weight:700;font-size:13px}

/* ---------- 批改页：拍照优先 + 兜底选卷 ---------- */
.id-msg{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:10px;padding:10px 14px;font-size:13.5px;margin:0 0 12px}
.pick-fallback{margin-top:14px;border-top:1px dashed var(--line);padding-top:12px}
.pick-fallback summary{cursor:pointer;font-size:13.5px;color:var(--ink-3);padding:4px 0;user-select:none}
.pick-fallback summary:hover{color:var(--primary)}
.code-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:10px}
.code-row input{flex:1;min-width:140px;padding:9px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:14px;letter-spacing:.12em;text-transform:uppercase}
.code-row input:focus{outline:none;border-color:var(--primary)}

/* 免费额度引导 */
.quota-wall{background:var(--card);border:1.5px solid var(--primary-weak);border-radius:16px;padding:26px 22px;text-align:center;margin:18px 0}
.quota-hint{display:inline-block;margin-left:8px;color:var(--ink-3);font-size:12.5px}

/* ============================================================
   移动端升级：触摸目标 ≥44px + 知识线路横滑渐隐
   ============================================================ */

/* 知识线路横滑提示：右侧渐隐，滑到底自动消失 */
.kb-line.can-scroll{
  -webkit-mask-image:linear-gradient(to right,#000 0,#000 calc(100% - 34px),transparent 100%);
  mask-image:linear-gradient(to right,#000 0,#000 calc(100% - 34px),transparent 100%);
}
.kb-line.can-scroll.at-end{
  -webkit-mask-image:none;mask-image:none;
}
.kb-swipe-hint{
  display:none;align-items:center;gap:6px;font-size:12.5px;color:var(--primary);
  background:var(--primary-weak);border:1px dashed var(--primary-soft);border-radius:999px;
  padding:5px 12px;margin:0 0 10px;transition:opacity .3s;
}
.kb-swipe-hint.show{display:inline-flex}
.kb-swipe-hint.gone{opacity:0}
.kb-swipe-hint i{font-style:normal;animation:kbArrow 1.4s ease-in-out infinite}
@keyframes kbArrow{0%,100%{transform:translateX(0);opacity:.55}50%{transform:translateX(4px);opacity:1}}
@media (prefers-reduced-motion:reduce){.kb-swipe-hint i{animation:none}}

@media (max-width:640px){
  /* --- 头部：导航条每项 44px 高，横滑不挤 --- */
  .site-head .btn-sm{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px}
  .site-nav a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px}
  .child-pill{min-height:38px;display:inline-flex;align-items:center;padding:0 12px}
  .child-switch{gap:8px}

  /* --- 首页学科/年级选择 --- */
  .subj-tab{min-height:44px;display:inline-flex;align-items:center;justify-content:center}
  .grade-pill.big{min-height:40px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px}
  .grade-row{gap:8px}

  /* --- 所有表单控件（下拉/输入）统一 44px --- */
  .toolbar select.input,
  .toolbar .input,
  select.input,
  .code-row input{min-height:44px}
  .toolbar{row-gap:8px}
  .toolbar select.input{flex:1 1 calc(50% - 4px);min-width:0}

  /* --- 通用按钮 --- */
  .btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;text-align:center}
  .btn-sm{min-height:40px}
  .load-more{display:flex;width:fit-content;margin-left:auto;margin-right:auto;min-height:46px}

  /* --- 做题页选项：整行可点，高度够手指 --- */
  .qz-opt{min-height:48px;padding:12px 12px;align-items:center;gap:10px;font-size:15px}
  .qz-opt input[type=radio]{width:20px;height:20px;flex:none}
  .qz-input{min-height:46px;font-size:16px}  /* 16px 防止 iOS 自动放大 */

  /* --- 视图切换 / 列表模式按钮 / 树节点 --- */
  .view-toggle{padding:4px}
  .view-toggle button{min-height:38px;padding:0 16px}
  .node-btn{min-height:38px;padding:0 14px;font-size:12.5px}
  .tree-head{min-height:44px}
  .tab-btn{min-height:42px}

  /* --- 知识地图站点：加宽，名字不挤 --- */
  .kb-line{padding:10px 2px 14px}
  .kstation{width:86px;min-height:56px}
  .ks-name{font-size:12.5px}
}

/* ============================================================
   视觉升级 v3：整板铺满背景 · 呼吸感 · 动态效果
   ============================================================ */
html{overflow-x:clip;scroll-behavior:smooth}

/* -- 全站底色：暖调整板铺满，光斑随呼吸缓慢漂移（fixed 层，兼容 iOS） -- */
body{
  background:var(--bg);
  background-image:none;
}
body::before{
  content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(46vmax 46vmax at 10% 6%,rgba(253,186,116,.32),transparent 62%),
    radial-gradient(44vmax 44vmax at 92% 96%,rgba(251,146,60,.20),transparent 60%),
    linear-gradient(180deg,#fffcf8 0%,#fff5ec 46%,#ffe9d9 100%);
  animation:bg-breathe 22s ease-in-out infinite alternate;
}
@keyframes bg-breathe{
  from{background-position:0 0,0 100%,0 0}
  to{background-position:6vmax 4vmax,-6vmax -4vmax,0 0}
}

/* -- Hero 改整板铺满：去卡片感，双光晕缓慢游移，星点平移 -- */
.hero{
  margin:0 calc(50% - 50vw);
  border-radius:0;
  padding:76px 32px 66px;
  box-shadow:none;
  background:
    radial-gradient(620px 420px at 86% -12%,rgba(249,115,22,.38),transparent 68%),
    radial-gradient(540px 400px at 6% 112%,rgba(194,65,12,.55),transparent 70%),
    linear-gradient(150deg,#241a10 0%,#4a1504 46%,#9a3412 100%);
  background-size:150% 150%,150% 150%,100% 100%;
  animation:hero-glow 18s ease-in-out infinite alternate;
}
@keyframes hero-glow{
  from{background-position:0% 0%,100% 100%,0 0}
  to{background-position:26% 18%,74% 82%,0 0}
}
.hero::before{animation:dots-pan 90s linear infinite}
@keyframes dots-pan{to{background-position:264px 264px}}

/* -- 首屏标题：白色高亮 + 流光渐变（修复深色面板上深灰字的问题） -- */
.hero h1{color:#fff;text-shadow:0 2px 20px rgba(0,0,0,.28)}
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .hero h1{
    background:linear-gradient(100deg,#ffffff 18%,#ffd9a8 38%,#ffffff 58%,#ffe4bd 80%);
    background-size:230% 100%;
    -webkit-background-clip:text;background-clip:text;
    color:transparent;-webkit-text-fill-color:transparent;
    text-shadow:none;
    animation:h1-shimmer 7s ease-in-out infinite,hero-rise .8s cubic-bezier(.22,1,.36,1) .12s both;
  }
}
@keyframes h1-shimmer{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

/* -- 首屏内容逐层浮现（入场呼吸感） -- */
.hero>*{animation-name:hero-rise;animation-duration:.8s;animation-timing-function:cubic-bezier(.22,1,.36,1);animation-fill-mode:both}
/* 注意：.hero>* 的 animation 会覆盖上面的 hero-glow？不会——glow 在 .hero 自身 */
.hero>*:nth-child(1){animation-delay:.04s}
.hero>*:nth-child(2){animation-delay:.12s}
.hero>*:nth-child(3){animation-delay:.20s}
.hero>*:nth-child(4){animation-delay:.28s}
.hero>*:nth-child(5){animation-delay:.36s}
.hero>*:nth-child(n+6){animation-delay:.44s}
@keyframes hero-rise{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* -- 呼吸感间距：页面留白整体放大 -- */
.container{padding-bottom:88px}
.page-head{margin:34px 0 16px}
.section-title{margin:52px 0 18px}

/* -- 科目卡：hover 扫光 -- */
.subject-card{position:relative;overflow:hidden}
.subject-card::after{
  content:'';position:absolute;top:0;left:-90%;width:55%;height:100%;
  background:linear-gradient(105deg,transparent,rgba(255,255,255,.55),transparent);
  transform:skewX(-18deg);transition:left .65s ease;pointer-events:none;
}
.subject-card:hover::after{left:135%}
.subject-card,.stat-card,.mode-card,.diag-card{transition:transform .3s cubic-bezier(.22,1,.36,1),box-shadow .3s ease,border-color .3s ease}

/* -- 滚动浮现（配 app.js 的 IntersectionObserver） -- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}

@media (min-width:641px) and (max-width:820px){
  .hero{padding:58px 26px 52px}
}
@media (max-width:640px){
  .hero{padding:48px 18px 42px}
  .hero h1{font-size:27px}
  .container{padding-bottom:66px}
  .page-head{margin:24px 0 10px}
  .section-title{margin:38px 0 14px}
}

/* -- 无障碍：跟随系统减弱动态 -- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::before,.hero,.hero::before,.hero>*,.hero h1,.btn-cta{animation:none!important}
  .reveal{opacity:1;transform:none;transition:none}
}
@media print{
  body::before{display:none}
  .hero{background:#fff!important;color:var(--ink)}
  .hero h1{color:var(--ink)!important;-webkit-text-fill-color:var(--ink)}
}

/* ============================================================
   首屏整铺 v4：header/模式条融入深色首屏 · 吸附滚动 · 网格呼吸 · 鼠标尾随光晕
   ============================================================ */

/* -- 修吸顶：sticky 移到外层容器（原来 sticky 在矮盒子里，滚一点就失效） -- */
#site-header{position:sticky;top:0;z-index:10}
.site-head{position:relative}

/* -- 首页首屏：header 与模式条改为深色玻璃，融进 hero 渐变，消除割裂 -- */
body.on-hero .site-head{
  background:rgba(30,21,12,.72);
  border-bottom-color:rgba(255,255,255,.08);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
body.on-hero .brand{color:#fff7ed}
body.on-hero .site-nav a{color:rgba(255,237,213,.78)}
body.on-hero .site-nav a:hover{background:rgba(255,255,255,.09);color:#fff;text-decoration:none}
body.on-hero .site-nav a.active{background:var(--grad);color:#fff}
body.on-hero .site-nav a.nav-zk{color:#fdba74}
body.on-hero .site-nav a.nav-zk:hover{background:rgba(253,186,116,.14);color:#fde8d0}
body.on-hero .site-nav a.nav-zk.active{background:var(--grad);color:#fff}
body.on-hero .site-nav a.nav-vip{color:#fbbf24;border-color:rgba(251,191,36,.45)}
body.on-hero .site-nav a.nav-vip:hover{background:rgba(251,191,36,.15);color:#fde68a;border-color:#fbbf24}
body.on-hero .site-nav a.nav-vip.active{background:var(--grad);border-color:transparent;color:#fff}
body.on-hero .head-link{color:rgba(255,237,213,.8)}
body.on-hero .mode-strip{
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.13);
  color:#fde8d0;
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  margin-top:10px;
}
body.on-hero .mode-strip a{color:#fdba74}

/* -- hero 成为「第一屏」：纵向居中，底部露出下一屏开头 -- */
body.on-hero .hero{
  display:flex;flex-direction:column;justify-content:center;align-items:center;
  scroll-snap-align:start;
}
html.snap-on{scroll-snap-type:y proximity;scroll-padding-top:var(--head-h,110px)}
.fold{scroll-snap-align:start}

/* -- 下滑引导：呼吸浮动的箭头，开始滚动即淡出 -- */
.scroll-hint{
  position:absolute;left:50%;bottom:18px;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:2px;
  color:rgba(255,222,184,.85);font-size:12.5px;letter-spacing:.1em;
  cursor:pointer;user-select:none;pointer-events:auto;
  transition:opacity .45s ease,transform .45s ease;
  animation:hint-bob 2.4s ease-in-out infinite;
}
.scroll-hint i{font-style:normal;font-size:17px;line-height:1}
.scroll-hint.hide{opacity:0;transform:translateX(-50%) translateY(10px);pointer-events:none}
@keyframes hint-bob{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(7px)}}
.scroll-hint.hide{animation-play-state:paused}

/* -- 网格呼吸：全站点阵固定层，透明度缓慢起伏 + 极慢漂移 -- */
body::after{
  content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(rgba(197,111,44,.17) 1px,transparent 1.45px);
  background-size:26px 26px;
  animation:grid-breathe 6.5s ease-in-out infinite,grid-drift 150s linear infinite;
}
@keyframes grid-breathe{0%,100%{opacity:.45}50%{opacity:1}}
@keyframes grid-drift{to{background-position:260px 260px}}
/* hero 内星点同步呼吸 */
body.on-hero .hero::before{animation:dots-pan 90s linear infinite,grid-breathe 6.5s ease-in-out infinite}

/* -- 鼠标尾随光晕：暖光慢半拍跟随，soft-light 混合不压内容 -- */
.trail-glow{
  position:fixed;left:0;top:0;width:520px;height:520px;z-index:5;
  border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(255,171,84,.75) 0%,rgba(255,150,60,.28) 38%,transparent 68%);
  mix-blend-mode:soft-light;
  animation:glow-breathe 4.2s ease-in-out infinite;
  will-change:transform;
}
@keyframes glow-breathe{0%,100%{opacity:.55;filter:blur(2px)}50%{opacity:.95;filter:blur(0px)}}

@media (prefers-reduced-motion:reduce){
  .scroll-hint,body::after,.trail-glow,body.on-hero .hero::before{animation:none!important}
  html.snap-on{scroll-snap-type:none}
}
@media (max-width:640px){
  .trail-glow{display:none}   /* 手机无鼠标，省一层合成 */
}

/* 第二屏露出量不被标题外边距吃掉 */
body.on-hero .fold .section-title{margin-top:0}

/* 提示条融入首屏：挪到 hero 最底部，弱化为小字（老板要求隐蔽） */
body.on-hero .hero .mode-strip{
  max-width:760px;margin:22px auto 0;align-self:center;text-align:center;
  border-radius:999px;font-size:12px;padding:6px 16px;opacity:.72;
}
body.on-hero .hero .mode-strip b{opacity:.9}

/* -- 首页内容区：三步用法 + 功能入口（充实第二屏以下） -- */
.card-go{display:inline-block;margin-top:10px;color:var(--primary);font-weight:700;font-size:13.5px}
.subject-card:hover .card-go{transform:translateX(3px)}
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.how-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px 22px;position:relative;overflow:hidden}
.how-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad)}
.how-no{display:inline-flex;width:34px;height:34px;border-radius:12px;background:var(--grad);color:#fff;font-weight:800;font-size:16px;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(234,88,12,.3)}
.how-card h3{margin:12px 0 6px;font-size:16.5px}
.how-card p{margin:0;color:var(--ink-2);font-size:13.5px;line-height:1.7}
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.feat-card{display:flex;flex-direction:column;gap:4px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 18px;color:var(--ink);transition:all .3s cubic-bezier(.22,1,.36,1)}
.feat-card:hover{border-color:var(--primary);box-shadow:0 10px 28px rgba(234,88,12,.14);transform:translateY(-4px);text-decoration:none}
.feat-card .f-ico{font-size:26px}
.feat-card b{font-size:15.5px}
.feat-card .f-desc{color:var(--ink-2);font-size:13px}
@media (max-width:820px){
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .how-grid{grid-template-columns:1fr}
}

/* 打印/无 JS 环境不隐藏内容 */
@media print{.reveal{opacity:1!important;transform:none!important}}

/* ============================================================
   首页单屏版 v6：轨道闭环 + 左操作台 + 右知识星图（观赏性重设计）
   ============================================================ */
body.on-hero .container{padding-bottom:0}

/* -- 一屏：内容垂直居中 -- */
.hero.hero-solo{
  display:flex;flex-direction:column;justify-content:center;align-items:center;
  padding-bottom:clamp(48px,8vh,86px);
  min-height:100vh;min-height:100svh;
}

/* -- 学习闭环：一条玻璃轨道，首尾节点高亮，形成"旅程感" -- */
.flow-strip{
  display:inline-flex;gap:2px;justify-content:center;align-items:center;flex-wrap:wrap;
  margin:0 auto clamp(26px,4.5vh,46px);
  padding:8px 16px;border-radius:999px;
  background:rgba(255,247,237,.05);border:1px solid rgba(253,186,116,.18);
  backdrop-filter:blur(6px);max-width:none;
}
.fs-step{
  display:inline-flex;align-items:center;gap:5px;padding:7px 12px;border-radius:999px;white-space:nowrap;
  background:transparent;border:1px solid transparent;color:rgba(255,237,213,.82);font-size:12.5px;
  text-decoration:none;transition:background .15s,border-color .15s,color .15s;
}
.fs-step:hover{background:rgba(253,186,116,.16);border-color:rgba(253,186,116,.35);color:#fff;text-decoration:none}
.fs-step i{font-style:normal;font-size:14px;line-height:1}
.fs-step.is-start{background:rgba(253,186,116,.16);border-color:rgba(253,186,116,.4);color:#ffedd5;font-weight:600}
.fs-step.is-end{color:#fde68a;font-weight:600}
.fs-arrow{color:rgba(253,186,116,.42);font-size:15px;font-weight:700;flex:none;line-height:1}

/* -- 主区：左文案+操作台，右知识星图 -- */
.hero-main{
  display:flex;align-items:center;justify-content:center;
  gap:clamp(30px,4.5vw,72px);
  width:min(1150px,100%);margin:0 auto;text-align:left;
}
.hero-left{flex:1 1 auto;min-width:0}

/* 标题：两行断句，第二行橙色渐变强调 */
.hero.hero-solo h1{
  text-align:left;margin:0 0 18px;
  font-size:clamp(34px,4.4vw,56px);line-height:1.16;letter-spacing:-.015em;
}
.hero.hero-solo h1 em{
  font-style:normal;
  background:linear-gradient(100deg,#fdba74 5%,#f97316 55%,#fbbf24 100%);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;-webkit-text-fill-color:transparent;
}
.hero.hero-solo .lede{text-align:left;margin:0 0 28px;max-width:640px;font-size:clamp(14.5px,1.15vw,16.5px)}

/* 操作台：年级/科目/CTA 收进一张玻璃面板，选定动作一目了然 */
.hero-console{
  max-width:560px;
  background:rgba(255,247,237,.055);border:1px solid rgba(253,186,116,.22);
  border-radius:20px;padding:20px 22px 22px;backdrop-filter:blur(8px);
  box-shadow:0 18px 50px rgba(0,0,0,.28);
}
.cs-row{display:flex;align-items:center;gap:14px}
.cs-row + .cs-row{margin-top:12px}
.cs-label{flex:0 0 auto;width:36px;font-size:12.5px;color:rgba(253,186,116,.78);letter-spacing:.1em;font-weight:700}
.cs-row .hs-grades.one-line{flex-direction:row!important;display:flex;justify-content:flex-start;gap:8px;flex-wrap:wrap;margin:0}
.cs-row .hs-subjects{display:flex;justify-content:flex-start;gap:8px;flex-wrap:wrap;margin:0}
.cs-row .hs-grades,.cs-row .hs-subjects{flex:1 1 auto;min-width:0}
.cs-cta{margin-top:18px!important}
.cs-cta .btn-cta{width:100%;justify-content:center;padding:15px 30px;font-size:16.5px;border-radius:14px;
  box-shadow:0 10px 30px rgba(249,115,22,.4);animation:ctaGlow 3.2s ease-in-out infinite}
@keyframes ctaGlow{
  0%,100%{box-shadow:0 10px 30px rgba(249,115,22,.38)}
  50%{box-shadow:0 12px 42px rgba(249,115,22,.62)}
}

/* -- 知识星图卡片：SVG 考点网络点亮动画 + 双大数字 -- */
.hero-viz{flex:0 0 348px}
.viz-card{
  position:relative;
  background:rgba(255,247,237,.06);border:1px solid rgba(253,186,116,.26);
  border-radius:22px;padding:22px 26px 20px;backdrop-filter:blur(8px);
  box-shadow:0 22px 60px rgba(0,0,0,.32),inset 0 1px 0 rgba(255,255,255,.08);
}
.viz-cap{display:flex;align-items:center;font-size:12px;letter-spacing:.12em;color:rgba(253,186,116,.85);font-weight:600}
.viz-map{width:100%;height:auto;display:block;margin:8px 0 0}
.viz-map .ve{stroke:rgba(253,186,116,.15);stroke-width:1.2;stroke-linecap:round}
.viz-map .ve.lit{stroke:url(#vizGrad);stroke-width:1.6;opacity:.8}
.viz-map .vn{fill:none;stroke:rgba(253,186,116,.42);stroke-width:1.4}
.viz-map .vn.halo{fill:rgba(249,115,22,.22);stroke:none;filter:blur(7px)}
.viz-map .vn.on{
  fill:#fdba74;stroke:#ffedd5;stroke-width:1;
  filter:drop-shadow(0 0 5px rgba(249,115,22,.7));
  animation:vizPulse 3.2s ease-in-out infinite;
}
@keyframes vizPulse{
  0%,100%{filter:drop-shadow(0 0 4px rgba(249,115,22,.55))}
  50%{filter:drop-shadow(0 0 12px rgba(249,115,22,1))}
}
.viz-stats{
  display:flex;align-items:stretch;gap:18px;
  margin-top:12px;padding-top:16px;
  border-top:1px dashed rgba(253,186,116,.24);
}
.vs{flex:1;min-width:0}
.vs-n{display:flex;align-items:baseline;gap:6px;white-space:nowrap}
.vs-n b{
  font-size:clamp(27px,2.5vw,33px);font-weight:800;letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;color:#fff;
  text-shadow:0 2px 16px rgba(249,115,22,.4);
}
.vs-n b.bump{animation:hmBump .6s ease}
.vs-n span{font-size:13px;color:rgba(253,186,116,.92);font-weight:600}
.vs-sub{display:block;margin-top:4px;font-style:normal;font-size:11.5px;color:rgba(255,237,213,.55);letter-spacing:.03em;white-space:nowrap}
.vs-div{width:1px;background:linear-gradient(180deg,transparent,rgba(253,186,116,.32),transparent)}
.viz-foot{margin-top:12px;font-size:12px;color:rgba(255,237,213,.5)}
.viz-foot b{color:#fdba74;font-weight:700;font-variant-numeric:tabular-nums}
.hm-plus{
  position:absolute;right:20px;top:44px;font-style:normal;
  font-size:14px;font-weight:800;color:#4ade80;opacity:0;pointer-events:none;
  text-shadow:0 2px 10px rgba(74,222,128,.5);
}
.hm-plus.on{animation:hmPlus 1.7s ease-out}
@keyframes hmPlus{
  0%{opacity:0;transform:translateY(7px)}
  18%{opacity:1;transform:translateY(0)}
  100%{opacity:0;transform:translateY(-15px)}
}

/* -- 公共小件 -- */
.hm-dot{
  display:inline-block;width:6px;height:6px;border-radius:50%;background:#34d399;
  margin-right:7px;vertical-align:middle;animation:hmPulse 2.4s ease-out infinite;
}
@keyframes hmPulse{
  0%{box-shadow:0 0 0 0 rgba(52,211,153,.65)}
  70%{box-shadow:0 0 0 7px rgba(52,211,153,0)}
  100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}
}
@keyframes hmBump{
  0%{transform:translateY(0);color:#fff}
  28%{transform:translateY(-3px);color:#86efac;text-shadow:0 2px 22px rgba(74,222,128,.75)}
  100%{transform:translateY(0);color:#fff}
}

/* -- 响应式：平板上下堆叠、星图藏图保数；手机全竖排 -- */
@media (max-width:1020px){
  .hero-main{flex-direction:column;gap:30px;text-align:center}
  .hero-left{display:flex;flex-direction:column;align-items:center}
  .hero.hero-solo h1,.hero.hero-solo .lede{text-align:center}
  .hero.hero-solo .lede{margin:0 auto 26px}
  .hero-console{text-align:left}
  .cs-row{flex-direction:column;align-items:center;gap:8px}
  .cs-label{width:auto}
  .hero-viz{flex:0 0 auto;width:min(430px,100%)}
  .viz-map{display:none}
  .viz-card{padding:18px 22px 16px}
  .viz-stats{margin-top:0;padding-top:0;border-top:0}
}
@media (max-width:640px){
  .flow-strip{max-width:calc(100% - 8px);justify-content:flex-start;padding:8px 10px}
  .hero.hero-solo h1{font-size:31px}
  .hero-console{padding:16px 16px 18px;border-radius:16px}
  .cs-cta .btn-cta{font-size:15.5px;padding:14px 20px}
  .viz-stats{gap:12px}
  .vs-n b{font-size:25px}
  .vs-sub{font-size:10.5px}
}
@media (max-width:380px){
  .vs-sub{display:none}
  .vs-n b{font-size:22px}
}

/* -- 无障碍：减弱动态 -- */
@media (prefers-reduced-motion:reduce){
  .viz-map .vn.on,.cs-cta .btn-cta{animation:none!important}
}

   会员购买流程（member.html）：孩子条 → 月/年 → 产品 → 核对 → 支付
   ============================================================ */
.kid-bar-wrap{margin:0 0 18px}
.kid-note{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;
  padding:14px 18px;border:1px solid var(--line);border-radius:14px;background:#fff;
}
.kid-note b{font-size:15px}
.kid-note span{flex:1 1 240px;font-size:13px;color:var(--muted)}
.kid-need{
  margin-bottom:10px;padding:10px 14px;border-radius:12px;font-size:13.5px;
  background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;
}
.kid-bar{display:flex;flex-wrap:wrap;gap:8px}
.kid-form{
  display:flex;flex-wrap:wrap;gap:10px 14px;align-items:flex-end;
  margin-top:10px;padding:14px 16px;border:1px dashed var(--line);border-radius:14px;background:#fff;
}
.kid-form label{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--muted)}
.kid-form .input{width:auto;min-width:150px}
.kid-form button{flex:0 0 auto}
.agree-row{display:flex;gap:7px;align-items:flex-start;margin-top:12px;font-size:13px;color:var(--ink-2);line-height:1.7}
.agree-row input{margin-top:3px;accent-color:var(--primary,#f97316)}
.agree-row a{color:var(--primary,#f97316);white-space:nowrap}

/* ============================================================
   会员自助开通向导（member.html）：核对 → 支付 → 完成
   ============================================================ */
.wiz-mask{
  position:fixed;inset:0;z-index:80;background:rgba(15,12,8,.62);backdrop-filter:blur(3px);
  display:flex;align-items:center;justify-content:center;padding:16px;overflow-y:auto;
}
.wiz{
  position:relative;width:min(560px,100%);max-height:92vh;overflow-y:auto;
  background:#fff;border-radius:18px;padding:26px 24px 22px;
  box-shadow:0 24px 70px rgba(20,10,0,.35);
}
.wiz-x{
  position:absolute;top:12px;right:14px;width:32px;height:32px;border-radius:50%;
  border:none;background:#f3f4f6;color:#6b7280;font-size:14px;cursor:pointer;
}
.wiz-x:hover{background:#e5e7eb;color:#111}
.wiz-steps{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 16px}
.wiz-steps .ws{
  font-size:11.5px;color:#9ca3af;padding:4px 10px;border-radius:999px;background:#f5f5f4;
}
.wiz-steps .ws.on{background:var(--primary,#f97316);color:#fff;font-weight:700}
.wiz-steps .ws.done{background:#ecfdf5;color:#059669}
.wiz-title{font-size:19px;margin:0 0 14px}
.w-field{margin:0 0 16px}
.w-field>label{display:block;font-size:13.5px;font-weight:700;color:#374151;margin-bottom:8px}
.w-chips{display:flex;gap:8px;flex-wrap:wrap}
.w-chip{
  padding:9px 16px;border-radius:999px;border:1.5px solid #e5e7eb;background:#fff;
  font-size:13.5px;color:#374151;cursor:pointer;transition:all .15s ease;
}
.w-chip:hover{border-color:#fdba74}
.w-chip.on{border-color:var(--primary,#f97316);background:#fff7ed;color:#c2410c;font-weight:700}
.w-chip.dis{opacity:.4;cursor:not-allowed}
.w-chip em{font-style:normal;font-size:10.5px;background:#fef3c7;color:#b45309;border-radius:4px;padding:1px 4px;margin-left:4px}
.w-new{
  display:grid;grid-template-columns:1fr 1fr;gap:10px;
  padding:12px;border:1px dashed #e5e7eb;border-radius:12px;background:#fafaf9;
}
.w-new label{display:block;font-size:12.5px;color:#6b7280}
.w-new .input{margin-top:5px}
.w-pay-amount{text-align:center;font-size:15px;color:#6b7280;margin:2px 0 14px}
.w-pay-amount b{font-size:34px;color:#111827;font-weight:800;margin-left:6px}
.w-pay-box{display:flex;gap:18px;align-items:flex-start}
.w-qr{text-align:center;flex:0 0 auto}
.w-qr img{width:168px;height:168px;border:1px solid #e5e7eb;border-radius:12px;object-fit:cover}
.w-qr p{font-size:12px;color:#6b7280;margin:6px 0 0}
.w-qr-fallback{
  width:168px;height:168px;border:1.5px dashed #fdba74;border-radius:12px;background:#fffbeb;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  font-size:14px;color:#92400e;font-weight:700;text-align:center;line-height:1.6;padding:8px;
}
.w-qr-fallback small{font-size:11.5px;font-weight:400;color:#b45309}
.w-pay-meta{flex:1;min-width:0;font-size:13.5px;color:#374151}
.w-pay-meta .input{margin-top:5px}
@media (max-width:560px){
  .wiz{padding:20px 16px 18px}
  .w-pay-box{flex-direction:column;align-items:center}
  .w-pay-meta{width:100%}
}
@media (max-width:640px){
  .hero.hero-solo{padding-bottom:40px}
  .hero.hero-solo .eyebrow{font-size:12.5px;letter-spacing:.12em;margin-bottom:14px;padding:8px 16px;font-weight:700}
  .hero.hero-solo h1{font-size:30px;margin-bottom:14px}
  .hero.hero-solo .lede{margin-bottom:24px;font-size:14px}
  .hero.hero-solo .subj-tab{padding:9px 18px;font-size:14.5px}
  .hs-grades.one-line{gap:8px;margin-bottom:24px}
  .hs-grades.one-line .grade-pill.big{font-size:13.5px;padding:11px 18px}
  .hero.hero-solo .hero-actions{width:100%;flex-direction:column;align-items:stretch;gap:10px}
  .hero.hero-solo .btn-cta,.hero.hero-solo .btn{width:100%;justify-content:center}
}
/* 矮屏（笔记本 768 高）压一压间距，保证一屏不挤 */
@media (max-height:760px) and (min-width:641px){
  .hero.hero-solo h1{font-size:clamp(30px,4.2vw,46px);margin-bottom:14px}
  .hero.hero-solo .lede{margin-bottom:24px}
  .hero-metrics{margin-top:18px;padding-top:14px}
}

/* -- 矮屏压缩：保证一屏正好装下（笔记本 768 高等） -- */
@media (max-height:800px) and (min-width:641px){
  .hero.hero-solo .eyebrow{margin-bottom:12px}
  .hero.hero-solo h1{margin-bottom:12px}
  .hero.hero-solo .lede{margin-bottom:20px}
  .hero.hero-solo .hs-subjects{margin-bottom:12px}
  .hs-grades.one-line{margin-bottom:20px}
  .hero.hero-solo .btn-cta{padding:13px 36px}
  .vs-n b{font-size:clamp(24px,2.6vw,30px)}
  .flow-strip{margin-bottom:20px}
}
/* -- 超矮小屏：进一步收紧，确保标题与 CTA 在首屏 -- */
@media (max-width:640px) and (max-height:700px){
  .hero.hero-solo .eyebrow{margin-bottom:10px;padding:5px 13px}
  .hero.hero-solo h1{font-size:26px;margin-bottom:10px}
  .hero.hero-solo .lede{margin-bottom:18px}
  .hero.hero-solo .hs-subjects{margin-bottom:10px}
  .hero.hero-solo .subj-tab{padding:8px 15px;font-size:13.5px}
  .hs-grades.one-line{margin-bottom:16px}
  .hero.hero-solo .btn-cta{padding:12px 30px;font-size:15px}
  .hero.hero-solo .btn{min-height:46px;padding:10px 20px}
  .hero-metrics{margin-top:18px;padding-top:14px}
}

/* ============================================================
   会员定价 v2：4 档科目套餐 × 月付/年付
   ============================================================ */
.pricing-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:34px 0 4px}
.pricing-head .section-title{margin:0}
.bill-switch{display:inline-flex;background:var(--card);border:1.5px solid var(--line);border-radius:999px;padding:4px;gap:2px}
.bill-switch button{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 20px;border-radius:999px;border:0;background:transparent;
  font-size:14px;font-weight:600;color:var(--ink-2);cursor:pointer;transition:all .2s ease;
}
.bill-switch button.on{background:var(--grad);color:#fff;box-shadow:0 3px 12px rgba(234,88,12,.25)}
.bill-switch button i{font-style:normal;font-size:11px;opacity:.8;font-weight:500}

.pricing-grid.four{grid-template-columns:repeat(4,1fr);gap:14px}
.tier-card{padding:24px 18px;gap:6px}
.tier-card h3{font-size:20px;font-weight:800}
.tier-scope{color:var(--ink-3);font-size:12.5px;margin:0}
.tier-card .price-num{font-size:38px;line-height:1.1;margin-top:6px;color:var(--ink)}
.tier-card.hot .price-num{color:var(--primary)}
.tier-card .price-num span{font-size:13px;color:var(--ink-3);font-weight:600}
.price-month{margin:0;font-size:12.5px;color:var(--ink-3);min-height:34px}
.price-month b{color:var(--primary);font-size:14px}
.price-month em{font-style:normal;display:inline-block;margin-left:4px;background:var(--primary-weak);color:var(--primary);font-weight:700;font-size:11px;padding:2px 7px;border-radius:999px}
.tier-card ul{margin-top:10px;padding-top:12px;border-top:1px dashed var(--line)}
.tier-card li{font-size:12.5px;line-height:1.55}
.tier-card .btn{margin-top:auto;min-height:44px}

@media (max-width:980px){
  .pricing-grid.four{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .pricing-head{margin-top:24px;gap:10px}
  .bill-switch{width:100%;justify-content:center}
  .bill-switch button{flex:1;justify-content:center;padding:10px 12px;min-height:44px}
  .pricing-grid.four{grid-template-columns:repeat(2,1fr);gap:10px}
  .tier-card{padding:18px 13px}
  .tier-card h3{font-size:17px}
  .tier-card .price-num{font-size:29px}
  .tier-card .price-num span{font-size:11.5px}
  .tier-card li{font-size:11.5px}
  .tier-scope{font-size:11.5px}
  .price-month{font-size:11.5px;min-height:32px}
  .tier-card .btn{min-height:46px;font-size:14px;padding:10px 12px}
}
/* 付费说明卡 */
.pay-note-title{font-size:16px;font-weight:800;margin-bottom:6px;color:var(--primary)}
.pay-note-sub{font-size:12.5px;opacity:.7;margin:6px 0 0}

/* 管理端：科目多选 */
.subj-checks{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.subj-checks label{
  display:inline-flex;flex-direction:row;align-items:center;gap:6px;
  padding:7px 14px;border:1px solid var(--line);border-radius:999px;
  background:var(--card);font-size:13.5px;cursor:pointer;user-select:none;
}
.subj-checks label.all{border-color:var(--primary-weak);background:var(--primary-weak);color:var(--primary);font-weight:600}
.subj-checks input{accent-color:var(--primary);margin:0}

/* ============================================================
   页面排版 v6：页头面板化 · 文字排版统一 · 工具栏卡片化
   ============================================================ */

/* -- 页头面板化：所有内页统一为一张暖色渐变头卡 -- */
.page-head{
  display:grid;grid-template-columns:1fr auto;gap:6px 18px;align-items:center;
  background:linear-gradient(135deg,#fffdf9 0%,#fff5e9 100%);
  border:1px solid rgba(234,88,12,.12);
  border-radius:20px;
  padding:24px 28px 22px;
  margin:26px 0 20px;
  position:relative;overflow:hidden;
  box-shadow:0 6px 24px rgba(234,88,12,.07);
}
.page-head::before{
  content:'';position:absolute;right:-70px;top:-90px;width:250px;height:250px;border-radius:50%;
  background:radial-gradient(circle,rgba(251,146,60,.13),transparent 68%);pointer-events:none;
}
.page-head h1{
  grid-column:1;grid-row:1;align-self:center;
  font-size:27px;margin:0;position:relative;padding-left:16px;
  letter-spacing:-.01em;line-height:1.3;
}
.page-head h1::before{
  content:'';position:absolute;left:0;top:7px;bottom:7px;width:5px;border-radius:4px;
  background:var(--grad);box-shadow:0 2px 8px rgba(234,88,12,.35);
}
.page-head .subject-switch{grid-column:2;grid-row:1;justify-self:end}
/* 副标题：永远独占标题下一行整行宽 */
.ph-sub{grid-column:1/-1;grid-row:2;margin:4px 0 0;color:var(--ink-2);font-size:14.5px;line-height:1.85;max-width:860px;position:relative}
.ph-sub b{color:var(--primary);font-weight:700}
.ph-sub a{color:var(--primary);font-weight:600}
.page-head .subject-switch{position:relative}

/* -- 正文文字排版统一：行高、字距、重点色 -- */
.lede{color:var(--ink-2);max-width:720px;margin:0 0 22px;font-size:15px;line-height:1.9;letter-spacing:.01em}
.lede b{color:var(--primary);font-weight:700}
.lede-sm{color:var(--ink-2);font-size:14.5px;margin:-6px 0 18px;line-height:1.85}
.lede-sm b{color:var(--primary);font-weight:700}
.meta-line{color:var(--ink-3);font-size:13.5px;margin:8px 0 12px;line-height:1.8}
.meta-line a{color:var(--primary);font-weight:600}

/* -- 工具栏卡片化：筛选/搜索不再裸排在页面上 -- */
.toolbar{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  padding:12px 14px;
  margin-bottom:16px;
  box-shadow:0 3px 14px rgba(234,88,12,.05);
}
.toolbar .input{min-height:42px;border-radius:10px}

/* -- 模式卡文字精修：图标对齐、描述行高 -- */
.mode-card{padding:18px 20px;border-radius:16px}
.mode-card .mc-icon{font-size:21px;margin-right:9px;vertical-align:-3px}
.mode-card b{font-size:15.5px;letter-spacing:.01em}
.mode-card .mc-desc{font-size:13px;line-height:1.78;margin-top:8px;color:var(--ink-2)}
.mode-card .mc-tag{top:14px;right:14px}

/* -- 学习树工具区：图例/视图切换/进度呼吸感 -- */
.legend-bar{margin:10px 0 12px;gap:18px;padding:10px 16px;background:var(--card);border:1px solid var(--line);border-radius:12px}
.legend{font-size:13.5px}
.legend-hint{font-size:12.5px}
.view-toggle{margin-bottom:14px}
#progress-line{font-size:13px;color:var(--ink-2);background:var(--primary-weak);display:inline-block;padding:7px 14px;border-radius:999px;margin-bottom:14px}
.grade-bar{margin:0 0 14px}

/* -- 内页小节标题：与头卡呼应 -- */
.section-title{font-size:19px;letter-spacing:.01em}

/* -- 移动端 -- */
@media (max-width:640px){
  .page-head{padding:18px 16px 16px;border-radius:16px;margin:18px 0 14px;gap:10px}
  .page-head h1{font-size:22px;padding-left:13px}
  .page-head h1::before{top:5px;bottom:5px;width:4px}
  .ph-sub{font-size:13.5px;line-height:1.8}
  .lede{font-size:14px;line-height:1.85;margin-bottom:16px}
  .lede-sm{font-size:13.5px}
  .toolbar{padding:10px 11px;border-radius:12px}
  .toolbar .input{min-height:44px}
  .mode-card{padding:15px 15px}
  .legend-bar{padding:9px 12px;gap:12px;border-radius:11px}
  .legend{font-size:12.5px}
  .legend-hint{font-size:11.5px;margin-left:0;flex-basis:100%}
  #progress-line{font-size:12px;padding:6px 12px}
}
@media (max-width:640px){
  .page-head .subject-switch{grid-column:1/-1;grid-row:2;justify-self:start}
  .page-head .subject-switch button{min-height:38px;padding:7px 16px}
  .ph-sub{grid-row:3}
}

/* 诊断成绩单·会员转化卡 */
.upsell-card{margin:0 0 18px;padding:18px 20px;border-radius:16px;border:1px solid #fbd7b0;
  background:linear-gradient(135deg,#fff8f0,#fff3e6);box-shadow:0 6px 22px rgba(234,88,12,.07)}
.upsell-card[hidden]{display:none}
.uc-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.uc-badge{font-size:11.5px;font-weight:800;letter-spacing:.06em;color:#fff;background:var(--grad);
  padding:3px 9px;border-radius:999px;flex:none}
.uc-head h3{margin:0;font-size:16.5px;color:#7c2d12;line-height:1.45}
.uc-list{margin:0 0 14px;padding:0;list-style:none;display:grid;gap:6px}
.uc-list li{font-size:13.5px;color:#8a5a2b;line-height:1.6;padding-left:2px}
.uc-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.uc-note{font-size:12.5px;color:#a8805c}
@media (max-width:640px){
  .upsell-card{padding:15px 16px;border-radius:14px}
  .uc-head h3{font-size:15px}
  .uc-actions .btn{width:100%;text-align:center}
}

/* ============ 管理员组卷（compose.html） ============ */
.cp-modes{display:flex;gap:8px;margin:0 0 12px}
.cp-mode-body{margin-bottom:6px}
#cp-points{resize:vertical;font-family:inherit}

/* -- 考试卷模板：学校试卷字体版式（宋体正文 + Times 数字，A4 打印） -- */
.exam-wrap{background:var(--bg,#f5f6f8);padding:22px 0 40px}
.exam-sheet{
  background:#fff;color:#000;max-width:210mm;margin:0 auto;
  padding:16mm 15mm 20mm;box-shadow:0 3px 24px rgba(0,0,0,.14);
  font-family:"Times New Roman","SimSun","宋体",serif;
  font-size:12.5pt;line-height:1.9;
}
.exam-title{
  font-family:"SimHei","黑体","SimSun",serif;font-weight:700;
  text-align:center;font-size:19pt;letter-spacing:.06em;margin:0 0 10px;
}
.exam-sub{text-align:center;font-size:10.5pt;margin:0 0 14px;color:#222}
.exam-points{border:1px solid #000;padding:8px 14px 10px;margin:0 0 16px}
.exam-points h3{
  font-family:"SimHei","黑体",serif;text-align:center;font-size:13pt;
  font-weight:700;margin:0 0 6px;letter-spacing:.3em;
}
.exam-points p{margin:0;line-height:1.85;font-size:11.5pt;text-align:justify}
.exam-body{column-fill:auto}
.ex-item{margin:0 0 10px;break-inside:avoid}
.ex-stem{margin:0 0 2px;text-align:justify}
.ex-opts{display:flex;flex-wrap:wrap;margin:0 0 2px}
.ex-opt{margin-right:14px;white-space:nowrap}
.ex-opt b{margin-right:2px;font-weight:700}
.ex-opts.c4 .ex-opt{width:25%;margin-right:0}
.ex-opts.c2 .ex-opt{width:50%;margin-right:0}
.ex-opts.c1 .ex-opt{display:block}
.ex-blank{border-bottom:1px solid #000;height:2em;margin:4px 0 2px}
.ex-blank2{height:4.5em}
.exam-answers{border-top:2px solid #000;margin-top:18px;padding-top:10px;break-before:page}
.exam-answers h3{font-family:"SimHei","黑体",serif;text-align:center;font-size:13pt;font-weight:700;margin:0 0 8px;letter-spacing:.3em}
.ans-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:2px 12px;font-size:11.5pt}

/* 打印：只输出试卷本体 */
@media print{
  body{background:#fff}
  #site-header,#site-footer,.site-head,.page-head,.auth-card,.no-print{display:none!important}
  main.container{padding:0;max-width:none}
  .exam-wrap{padding:0;background:#fff}
  .exam-sheet{box-shadow:none;max-width:none;padding:0;margin:0}
  .ex-item,.exam-points{break-inside:avoid}
  .exam-answers{break-before:page}
}
@page{size:A4;margin:14mm 15mm}
@media (max-width:640px){
  .exam-sheet{padding:18px 14px;font-size:11pt}
  .exam-title{font-size:15pt}
  .ans-grid{grid-template-columns:repeat(3,1fr)}
}

/* ============================================================
   视觉升级层 v1（2026-10-30）：全站内页统一设计语言
   与首页 V3 同源：暖白底 + 柔影 + 橙光晕；追加在末尾，同特异性下覆盖旧规则
   ============================================================ */

/* —— 全局氛围：顶部暖光晕压住点阵，页面不再「下半空旷」 —— */
body{
  background-image:
    radial-gradient(1100px 340px at 50% -80px, rgba(249,115,22,.10), transparent 70%),
    radial-gradient(circle, rgba(236,223,211,.9) 1px, transparent 1px);
  background-size:auto, 26px 26px;
  background-repeat:no-repeat, repeat;
  -webkit-font-smoothing:antialiased;
}

/* —— 页头横幅：竖橙条 + 光晕 + 柔影，替代干巴巴的裸标题 —— */
.page-head{
  position:relative;overflow:hidden;
  margin:26px 0 20px;padding:24px 28px 24px 30px;
  background:linear-gradient(115deg,#ffffff 0%,#fff8ef 45%,#ffedd8 100%);
  border:1px solid rgba(234,88,12,.18);
  border-radius:20px;
  box-shadow:0 14px 40px rgba(120,63,4,.10), inset 0 1px 0 rgba(255,255,255,.9);
}
.page-head::before{
  content:'';position:absolute;left:0;top:0;bottom:0;width:5px;
  background:var(--grad);border-radius:18px 0 0 18px;
}
.page-head::after{
  content:'';position:absolute;right:-50px;top:-70px;width:240px;height:240px;
  border-radius:50%;background:radial-gradient(circle, rgba(249,115,22,.15), transparent 68%);
  pointer-events:none;
}
.page-head h1{
  font-size:30px;font-weight:900;letter-spacing:-.01em;margin:0;
  background:linear-gradient(90deg,#1e293b 0%,#334155 100%);
  -webkit-background-clip:text;background-clip:text;
}
.page-head p{margin:8px 0 0;font-size:14.5px;color:var(--ink-2);position:relative}
.page-head .ph-sub::before{content:'';display:inline-block;width:18px;height:2px;background:var(--grad);vertical-align:middle;margin-right:8px;border-radius:2px}
.page-head .btn{position:relative;z-index:1}

/* —— 卡片家族：统一柔影 + 描边 + 悬浮微抬 —— */
.auth-card,.mode-card,.stat-card,.subject-card,.q-card,.topic-card,
.diag-card,.qr-card,.panel,.card{
  border-radius:16px;
  border-color:rgba(234,88,12,.10);
  box-shadow:0 6px 22px rgba(120,63,4,.06), inset 0 1px 0 rgba(255,255,255,.9);
}
.subject-card:hover,.mode-card:hover,.diag-card:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 32px rgba(234,88,12,.14);
}
.stat-card::before{height:3px}

/* —— 按钮家族：主按钮渐变 + 彩色投影，次按钮白底描边 —— */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:42px;padding:9px 18px;border-radius:12px;font-weight:700;
  transition:transform .12s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--grad);
  box-shadow:0 6px 18px rgba(234,88,12,.32), inset 0 1px 0 rgba(255,255,255,.25);
  border:none;color:#fff;
}
.btn-primary:hover{box-shadow:0 9px 26px rgba(234,88,12,.42);transform:translateY(-1px);text-decoration:none}
.btn:not(.btn-primary){
  background:#fff;border:1.5px solid #eaddcf;color:var(--ink-2);
}
.btn:not(.btn-primary):hover{border-color:var(--primary);color:var(--primary);background:var(--primary-weak);text-decoration:none}
.btn-success{background:linear-gradient(135deg,#059669,#10b981);border:none;color:#fff;box-shadow:0 6px 16px rgba(5,150,105,.28)}
.btn-lg{min-height:48px;padding:12px 26px;font-size:16px;border-radius:14px}
.btn-sm{min-height:34px;padding:5px 12px;border-radius:10px;font-size:13px}
.btn-round{border-radius:999px}

/* —— 表单控件：统一 44px 触控高度、聚焦橙环 —— */
.input,select.input,textarea.input{
  min-height:44px;padding:9px 14px;border-radius:12px;
  border:1.5px solid #e8ddd0;background:#fff;
  transition:border-color .15s, box-shadow .15s;
}
.input:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(249,115,22,.14);
}
select.input{
  appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;padding-right:32px;
}
input[type=checkbox]{width:17px;height:17px;accent-color:var(--primary)}
.pp-field > span{font-weight:600;color:var(--ink-2)}

/* —— 标签页（页内 tab）：胶囊化 —— */
.tab-btn{
  border-radius:999px;padding:8px 16px;min-height:38px;font-weight:600;
  border:1.5px solid #eaddcf;background:#fff;color:var(--ink-2);
}
.tab-btn:hover{border-color:var(--primary);color:var(--primary)}
.tab-btn.on{
  background:var(--grad);color:#fff;border-color:transparent;
  box-shadow:0 4px 14px rgba(234,88,12,.3);
}

/* —— 菜单项 / 空状态 / 提示条 —— */
.menu-item{border-radius:12px;transition:background .12s}
.menu-item:hover{background:var(--primary-weak)}
.empty-hint{
  background:linear-gradient(180deg,#fffdf9,#fff6ec);
  border:1.5px dashed rgba(234,88,12,.25);border-radius:16px;
}
.quota-wall{background:#fff;border-radius:18px;border:1px solid rgba(234,88,12,.10);box-shadow:0 12px 34px rgba(120,63,4,.10)}

/* —— 表格：圆角容器 + 表头浅橙 + 行悬浮 —— */
table{border-collapse:separate;border-spacing:0}
table thead th{background:var(--primary-weak);color:#9a3412;font-weight:700}
table tbody tr{transition:background .12s}
table tbody tr:hover{background:#fffaf4}

/* —— 滚动条与选区（细节质感） —— */
::selection{background:rgba(249,115,22,.22)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#e5d5c4;border-radius:8px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#d8c3ab}
:focus-visible{outline:2px solid rgba(249,115,22,.55);outline-offset:2px}

/* —— 手机端收紧 —— */
@media (max-width:640px){
  .page-head{margin:18px 0 14px;padding:16px 16px 16px 20px;border-radius:15px}
  .page-head h1{font-size:23px}
  .btn{min-height:44px}
  .container{padding:0 14px 48px}
}