:root{
  --ink:#16332b; --ink-2:#2d4a41; --muted:#6d7f78;
  --paper:#f7f5ef; --card:#ffffff; --line:#e3e1d8;
  --brand:#1f6f5c; --brand-2:#2b8a72; --brand-soft:#e7f1ec;
  --gold:#b98a3c; --gold-soft:#f7eeda; --danger:#a8422f;
  --shadow:0 1px 2px rgba(22,51,43,.05),0 8px 28px rgba(22,51,43,.06);
  --radius:18px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.3;margin:0 0 .4em;font-weight:650;letter-spacing:-.01em}
h1{font-size:clamp(28px,3.4vw,42px)}
h2{font-size:24px}
h3{font-size:18px}
p{margin:0 0 1em}
.muted{color:var(--muted)}
.small{font-size:13px}
.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand);font-weight:700;margin:0 0 10px}
.lede{font-size:17px;color:var(--ink-2);max-width:56ch}

.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px clamp(16px,4vw,48px);background:rgba(247,245,239,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:38px;height:38px;border-radius:12px;background:var(--ink);color:#f7f5ef;display:grid;place-items:center;font-weight:700;font-size:19px;font-family:"Songti SC","Noto Serif SC",serif}
.brand b{display:block;font-size:17px;line-height:1.1}
.brand small{display:block;font-size:11px;color:var(--muted);letter-spacing:.02em}
.nav{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:22px;font-size:14px}
.nav a{color:var(--ink-2);padding:4px 0;border-bottom:1px solid transparent}
.nav a:hover{border-color:var(--brand)}
.nav .quiet{color:var(--muted)}
.who{color:var(--muted);font-size:13px;padding-left:14px;border-left:1px solid var(--line)}
.shell{max-width:1120px;margin:0 auto;padding:clamp(24px,4vw,56px) clamp(16px,4vw,48px) 72px}
.shell.wide{max-width:1320px}
.foot{max-width:1320px;margin:0 auto;padding:24px clamp(16px,4vw,48px) 40px;color:var(--muted);font-size:12px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.badge-demo{background:var(--gold-soft);color:#7a5a1f;border:1px solid #e7d3a9;padding:1px 7px;border-radius:999px;font-size:10px;letter-spacing:.08em;font-weight:700}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:12px;padding:11px 18px;font-size:15px;font-weight:600;cursor:pointer;transition:.18s;background:#eee}
.btn.primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(31,111,92,.18)}
.btn.primary:hover{background:var(--brand-2);transform:translateY(-1px)}
.btn.dark{background:var(--ink);color:#fff}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink-2)}
.btn.ghost:hover{background:#fff;border-color:#c9c6ba}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:10px}
.btn.disabled{background:#eceae2;color:#9aa39f;cursor:not-allowed}
.link{color:var(--brand);font-weight:600}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:24px}
.alert{background:#fbebe7;border:1px solid #eccfc7;color:var(--danger);padding:10px 14px;border-radius:10px;font-size:14px;margin-bottom:14px}

/* login */
.login-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(24px,6vw,80px);align-items:center;min-height:calc(100vh - 190px)}
.login-wrap.single{grid-template-columns:minmax(0,420px);justify-content:center}
.login-copy h1{font-family:"Songti SC","Noto Serif SC",serif;font-weight:600;letter-spacing:-.01em;font-size:clamp(34px,4.6vw,56px);margin-top:6px}
.ticks{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:10px;color:var(--ink-2);font-size:14px}
.ticks li::before{content:"✓";color:var(--brand);font-weight:700;margin-right:10px}
.login-card{padding:32px;display:grid;gap:14px}
.login-card h2{font-size:22px;margin-bottom:0}
.login-card p{margin:0}
label{display:grid;gap:7px;font-size:13px;font-weight:600;color:var(--ink-2)}
input{width:100%;border:1px solid var(--line);background:#fbfaf6;border-radius:11px;padding:12px 14px;font-size:16px;color:var(--ink);outline:none;transition:.15s;font-family:inherit}
input:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(31,111,92,.1)}
.demo-hint{margin-top:6px;padding:14px;border-radius:12px;background:var(--brand-soft);font-size:12.5px;color:var(--ink-2);display:grid;gap:2px;line-height:1.8}
.demo-hint b{font-size:11px;letter-spacing:.12em;color:var(--brand)}
code{background:#fff;border:1px solid #d8e5df;padding:1px 6px;border-radius:5px;font-size:12px}

/* hero */
.hero{display:grid;grid-template-columns:1.3fr .7fr;gap:32px;align-items:end;padding:8px 0 34px;border-bottom:1px solid var(--line);margin-bottom:28px}
.hero h1{font-family:"Songti SC","Noto Serif SC",serif;font-weight:600}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.stats div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 14px;text-align:center}
.stats b{display:block;font-size:26px;line-height:1.1;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.stats span{font-size:11px;color:var(--muted);display:block;line-height:1.35}
.baseline{display:flex;align-items:center;justify-content:space-between;gap:20px;background:linear-gradient(120deg,#173c32,#245a4a);color:#f2f6f3;border-radius:var(--radius);padding:24px 28px;margin-bottom:40px;box-shadow:var(--shadow)}
.baseline h3{margin:8px 0 4px;color:#fff}
.baseline p{margin:0;color:#c9dbd3;font-size:14px}
.baseline .btn.primary{background:#e9c88a;color:#2a2313;box-shadow:none}
.baseline .btn.ghost{border-color:rgba(255,255,255,.35);color:#fff}
.baseline.done{background:#fff;color:var(--ink);border:1px solid var(--line)}
.baseline.done h3{color:var(--ink)}
.baseline.done p{color:var(--muted)}
.pill{display:inline-block;font-size:11px;letter-spacing:.1em;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:2px 9px;border-radius:999px}
.baseline.done .pill{background:var(--brand-soft);border-color:#cfe4db;color:var(--brand)}
.baseline.done .btn.ghost{color:var(--ink-2);border-color:var(--line)}
.baseline.done .btn.ghost:hover{background:#f7f6f1}

.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin:0 0 18px}
.section-head h1,.section-head h2{margin:0}
.section-head .muted{font-size:13px;margin:0;text-align:right}

/* courses */
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.course-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.18s}
.course-card:hover{transform:translateY(-3px);border-color:#cfd8d3;box-shadow:0 12px 34px rgba(22,51,43,.1)}
.cover{height:118px;background:
  radial-gradient(120% 120% at 85% 10%,hsla(var(--h),45%,72%,.75),transparent 55%),
  linear-gradient(135deg,hsl(var(--h) 34% 26%),hsl(calc(var(--h) + 18) 40% 16%));
  color:#fff;padding:16px 18px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.cover::after{content:"";position:absolute;right:-34px;bottom:-56px;width:150px;height:150px;border:1px solid rgba(255,255,255,.22);border-radius:50%}
.cover-no{font-family:"Songti SC",serif;font-size:30px;opacity:.92;line-height:1}
.cover-sub{font-size:11px;letter-spacing:.14em;opacity:.8}
.course-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.course-body h3{font-size:16.5px;margin:0}
.course-body p{font-size:12.5px;color:var(--muted);margin:0;line-height:1.6;flex:1}
.course-meta{display:grid;gap:6px;font-size:11px;color:var(--muted)}
.course-meta span{justify-self:end;font-variant-numeric:tabular-nums}
.bar{height:5px;background:#ecebe4;border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),#57a78f);border-radius:99px;transition:width .4s}
.course-card.is-done .cover::before{content:"已完成";position:absolute;top:12px;right:12px;background:rgba(255,255,255,.92);color:var(--brand);font-size:10px;padding:2px 8px;border-radius:99px;font-weight:700}
.done-chip{display:inline-flex;align-items:center;gap:5px;background:var(--brand-soft);color:var(--brand);font-size:12.5px;font-weight:600;padding:7px 12px;border-radius:99px}
.done-chip.sm{font-size:11px;padding:2px 8px}

/* course player */
.crumb{display:flex;gap:8px;align-items:center;font-size:12.5px;color:var(--muted);margin-bottom:14px}
.crumb a{color:var(--brand)}
.player-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:26px;align-items:start}
.player-main{min-width:0}
.video-wrap{position:relative;background:#0e1b17;border-radius:16px;overflow:hidden;box-shadow:0 18px 50px rgba(14,27,23,.22)}
.video-wrap video{display:block;width:100%;aspect-ratio:16/9;background:#0e1b17}
.demo-tag{position:absolute;top:12px;left:12px;background:rgba(10,20,17,.62);color:#e8efe9;font-size:11px;padding:4px 9px;border-radius:7px;backdrop-filter:blur(6px);pointer-events:none}
.lesson-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;margin:24px 0 16px}
.lesson-head h1{font-size:27px;margin-bottom:6px}
.lesson-head .muted{font-size:14px;margin:0}
.lesson-state{text-align:right;flex:none}
.lesson-state b{display:block;font-size:30px;line-height:1;font-variant-numeric:tabular-nums;color:var(--brand)}
.lesson-state span{font-size:11px;color:var(--muted);white-space:nowrap}
.lesson-actions{display:flex;gap:12px;align-items:center;margin:20px 0 0}
.lesson-note{display:flex;gap:12px;font-size:12.5px;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:12px;padding:13px 16px;margin-top:22px;line-height:1.6}
.lesson-note b{color:var(--ink-2);white-space:nowrap}
.player-side{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;position:sticky;top:92px;box-shadow:var(--shadow)}
.player-side h3{font-size:13px;color:var(--muted);letter-spacing:.08em;margin-bottom:12px}
.lesson-list{list-style:none;margin:0;padding:0;display:grid;gap:2px;max-height:56vh;overflow:auto}
.lesson-list a{display:grid;grid-template-columns:26px 1fr auto;gap:8px;align-items:center;padding:9px 8px;border-radius:9px;font-size:13px;color:var(--ink-2)}
.lesson-list a:hover{background:#f5f4ee}
.lesson-list li.active a{background:var(--brand-soft);color:var(--brand);font-weight:600}
.li-no{font-size:10.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.li-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.li-pct{font-size:10.5px;color:var(--muted)}
.side-nav{display:flex;justify-content:space-between;gap:8px;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}

/* quiz */
.quiz-wrap{max-width:780px;margin:0 auto}
.quiz-head{margin:8px 0 26px}
.quiz-head h1{font-size:30px}
.quiz-form{display:grid;gap:14px}
.q-card{border:1px solid var(--line);background:#fff;border-radius:14px;padding:20px 22px 8px;margin:0;min-width:0}
.q-legend{font-weight:600;font-size:16px;line-height:1.5;padding:0 0 10px;display:flex;gap:10px;align-items:baseline}
.q-no{width:24px;height:24px;border-radius:8px;background:var(--brand-soft);color:var(--brand);display:inline-grid;place-items:center;font-size:12px;flex:none}
.opt{display:flex;gap:10px;align-items:flex-start;padding:10px 10px;border-radius:9px;font-weight:400;font-size:14.5px;color:var(--ink-2);cursor:pointer}
.opt:hover{background:#f7f6f1}
.opt input{width:16px;height:16px;margin-top:3px;accent-color:var(--brand);flex:none}
.quiz-submit{display:flex;align-items:center;gap:16px;margin-top:10px}
.result-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:36px;text-align:center;box-shadow:var(--shadow)}
.result-card .hero-actions{justify-content:center}
.result-card h2{font-size:24px}
.score-ring{width:128px;height:128px;margin:10px auto 18px;border-radius:50%;display:grid;place-content:center;background:var(--brand-soft);color:var(--brand);border:1px solid #cfe4db}
.score-ring b{font-size:44px;line-height:1}
.score-ring span{font-size:13px;color:var(--muted)}
.result-card.low .score-ring{background:#fbebe7;color:var(--danger);border-color:#eccfc7}
.result-card.mid .score-ring{background:var(--gold-soft);color:#8a641f;border-color:#e7d3a9}
.review-title{margin:34px 0 14px}
.review-list{display:grid;gap:10px}
.review{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.review.ok{border-left:3px solid var(--brand)}
.review.no{border-left:3px solid #c2614c}
.review-q{font-weight:600;font-size:14.5px;display:flex;gap:9px;align-items:baseline;margin-bottom:8px}
.review-q em{margin-left:auto;font-style:normal;font-size:11.5px;color:var(--muted);font-weight:500}
.review-opts{display:grid;gap:4px;font-size:13px;color:var(--muted);padding-left:33px}
.review-opts .right{color:var(--brand);font-weight:600}
.review-opts .wrong{color:var(--danger);text-decoration:line-through}

/* report + table */
.report-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}
.report-stats div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.report-stats b{display:block;font-size:30px;line-height:1.1;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.report-stats b small{font-size:15px;color:var(--muted);font-weight:500}
.report-stats span{font-size:12px;color:var(--muted)}
.table-card{overflow:auto}
.table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:640px}
.table th{text-align:left;font-size:11px;letter-spacing:.06em;color:var(--muted);font-weight:600;padding:14px 16px;border-bottom:1px solid var(--line);background:#fbfaf6;white-space:nowrap}
.table td{padding:13px 16px;border-bottom:1px solid #efeee7;vertical-align:middle}
.table tr:last-child td{border-bottom:0}
.table tbody tr:hover{background:#fbfaf6}
.table a{color:var(--ink-2)}
.table a:hover{color:var(--brand)}
.cell-bar{min-width:150px}
.cell-bar .bar{display:inline-block;width:96px;vertical-align:middle;margin-right:8px}
.cell-bar span{font-size:11.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.footnote{font-size:12px;margin-top:16px}

/* misc */
@media (max-width:1020px){
  .course-grid{grid-template-columns:repeat(2,1fr)}
  .player-layout{grid-template-columns:1fr}
  .player-side{position:static}
  .lesson-list{max-height:none;grid-template-columns:1fr 1fr}
  .hero{grid-template-columns:1fr}
  .login-wrap{grid-template-columns:1fr;min-height:auto;padding-top:10px}
  .login-copy h1{font-size:36px}
  .report-stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .section-head{align-items:flex-start;flex-wrap:wrap;gap:6px}
  .section-head .muted{text-align:left}
  .topbar{padding:10px 14px}
  .brand small{display:none}
  .nav{gap:12px;font-size:13px}
  .nav .who{display:none}
  .shell{padding:20px 14px 56px}
  .course-grid{grid-template-columns:1fr}
  .cover{height:96px}
  .hero{padding-bottom:24px}
  .stats b{font-size:21px}
  .baseline{flex-direction:column;align-items:flex-start;padding:20px}
  .lesson-head{flex-direction:column;gap:10px}
  .lesson-state{text-align:left;display:flex;gap:10px;align-items:baseline}
  .lesson-state b{font-size:22px}
  .lesson-list{grid-template-columns:1fr}
  .quiz-head h1{font-size:25px}
  .q-card{padding:16px 14px 6px}
  .result-card{padding:24px 18px}
  .report-stats div{padding:14px}
  .report-stats b{font-size:24px}
  .table{font-size:12.5px}
  .table th,.table td{padding:10px 12px}
}
@media print{
  .topbar,.foot,.btn,.demo-tag{display:none!important}
  body{background:#fff}
  .shell{padding:0;max-width:none}
  .card,.table-card{box-shadow:none;border:0}
}

/* ============ 学员/管理端双入口 & 留言 ============ */
.nav-badge{display:inline-grid;place-items:center;min-width:17px;height:17px;padding:0 5px;margin-left:5px;border-radius:99px;background:var(--danger);color:#fff;font-size:10.5px;font-weight:700;vertical-align:top;line-height:17px}
.portal-admin{--brand:#1f5a6f;--brand-2:#2a7488;--brand-soft:#e6f0f3}
.portal-admin .brand-mark{background:#12303c}
.portal-admin .eyebrow{color:#1f5a6f}

.resume{display:flex;align-items:center;gap:12px;margin-top:14px;padding:11px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;max-width:560px;box-shadow:var(--shadow)}
.resume-dot{width:8px;height:8px;border-radius:50%;background:var(--brand-2);box-shadow:0 0 0 4px rgba(43,138,114,.14);flex:none}
.resume div{display:grid;gap:1px;min-width:0;flex:1}
.resume b{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.resume span{font-size:11.5px;color:var(--muted)}
.resume .btn{flex:none}

.flash{background:var(--brand-soft);border:1px solid #cfe4db;color:var(--brand);padding:10px 14px;border-radius:10px;font-size:13.5px;margin-bottom:16px}

select,textarea{width:100%;border:1px solid var(--line);background:#fbfaf6;border-radius:11px;padding:11px 13px;font-size:15px;color:var(--ink);outline:none;font-family:inherit;transition:.15s}
select:focus,textarea:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(31,111,92,.1)}
textarea{resize:vertical;min-height:100px;line-height:1.6}

.thread-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px;align-items:start}
.thread-layout.admin{grid-template-columns:340px minmax(0,1fr)}
.thread-card{padding:0;overflow:hidden;display:flex;flex-direction:column;min-height:320px}
.thread-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:15px 18px;border-bottom:1px solid var(--line);background:#fbfaf6}
.thread-head h3{margin:0;font-size:14px}
.thread-head > div{display:grid;gap:1px}
.thread-body{padding:20px 18px;display:flex;flex-direction:column;gap:12px;max-height:58vh;overflow:auto}
.thread-body.tall{max-height:52vh;min-height:260px}
.bubble-row{display:flex}
.bubble-row.from-me{justify-content:flex-end}
.bubble{max-width:78%;background:#f3f2ec;border-radius:14px 14px 14px 4px;padding:11px 14px;font-size:13.5px;line-height:1.65}
.from-me .bubble{background:var(--brand);color:#fff;border-radius:14px 14px 4px 14px}
.portal-admin .from-me .bubble{background:#1f5a6f}
.bubble p{margin:0}
.bubble time{display:block;font-size:10.5px;opacity:.62;margin-top:6px}
.bubble-tag{display:inline-block;font-size:10.5px;background:rgba(0,0,0,.06);padding:1px 7px;border-radius:99px;margin-bottom:6px}
.from-me .bubble-tag{background:rgba(255,255,255,.18)}
.empty{display:grid;gap:6px;place-items:center;text-align:center;color:var(--muted);padding:36px 16px;font-size:13px}
.empty b{color:var(--ink-2);font-size:15px}
.empty.tall{padding:80px 16px}
.compose{padding:20px;display:grid;gap:12px}
.compose h3{font-size:15px;margin:0}
.compose .btn{justify-self:start}
.compose.inline{display:grid;grid-template-columns:1fr auto;gap:10px;padding:14px 16px;border-top:1px solid var(--line);align-items:end}
.compose.inline textarea{min-height:64px}
.compose.inline .btn{justify-self:stretch}

.conv-list{list-style:none;margin:0;padding:0;max-height:66vh;overflow:auto}
.conv-list li{border-bottom:1px solid #efeee7}
.conv-list li:last-child{border-bottom:0}
.conv-list a{display:block;padding:12px 16px;transition:.15s}
.conv-list a:hover{background:#f8f7f2}
.conv-list li.active a{background:var(--brand-soft);border-left:3px solid var(--brand)}
.conv-top{display:flex;align-items:center;gap:8px;font-size:13.5px}
.conv-sub{font-size:11px;color:var(--muted);margin:1px 0 3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-last{font-size:12px;color:var(--ink-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-list time{display:block;font-size:10.5px;color:var(--muted);margin-top:3px}
.dot-badge{display:inline-grid;place-items:center;min-width:16px;height:16px;padding:0 5px;border-radius:99px;background:var(--danger);color:#fff;font-size:10px;font-weight:700}
.empty-li{padding:24px;text-align:center;color:var(--muted);font-size:13px}

.head-actions{display:flex;gap:8px;flex:none}

/* 课程管理 */
.chip{display:inline-block;font-size:11.5px;font-weight:600;padding:2px 9px;border-radius:99px}
.chip.on{background:var(--brand-soft);color:var(--brand)}
.chip.off{background:#f0eee7;color:#8b8f88}
.row-actions{display:flex;gap:14px;align-items:center;white-space:nowrap}
.row-actions form{margin:0}
.btn-link{background:none;border:0;padding:0;font:inherit;color:var(--brand);cursor:pointer;font-weight:600}
.btn-link:hover{text-decoration:underline}
.mono{font-variant-numeric:tabular-nums;color:var(--muted)}

.admin-form{display:grid;gap:16px;max-width:980px}
.form-block{display:grid;gap:14px;padding:22px 24px}
.form-block h3{margin:0;font-size:16px}
.form-block-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .span2{grid-column:1/-1}
.switch{display:flex;align-items:center;gap:9px;font-size:14px;font-weight:600;color:var(--ink-2);justify-self:start;cursor:pointer}
.switch input{width:18px;height:18px;accent-color:var(--brand)}
.form-actions{display:flex;gap:10px;padding-bottom:20px}
.q-edit{border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:grid;gap:10px;background:#fdfcf9}
.q-edit-head{display:flex;align-items:center;gap:10px}
.q-edit-head input{flex:1}
.del{display:flex;align-items:center;gap:5px;font-size:11.5px;color:var(--danger);font-weight:600;flex:none;cursor:pointer;white-space:nowrap}
.del input{width:14px;height:14px;accent-color:var(--danger)}
.opt-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.answer{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);justify-self:start}
.answer select{width:auto;padding:5px 9px;font-size:13px}

@media (max-width:1020px){
  .thread-layout,.thread-layout.admin{grid-template-columns:1fr}
  .thread-body{max-height:none}
  .form-grid{grid-template-columns:1fr}
  .opt-grid{grid-template-columns:1fr}
}
@media (max-width:680px){
  .resume{flex-wrap:wrap}
  .resume .btn{width:100%;justify-content:center}
  .compose.inline{grid-template-columns:1fr}
  .row-actions{flex-wrap:wrap;gap:8px}
  .thread-head{flex-wrap:wrap}
}

/* 上传 */
.upload-box{border:1px dashed #cfd8d3;border-radius:12px;padding:14px 16px;background:#fbfaf6;display:grid;gap:10px}
.upload-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.upload-head b{font-size:13.5px}
.upload-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.upload-row input[type=file]{flex:1;min-width:0;background:#fff;padding:8px 10px;font-size:13px}
.upload-progress{height:5px;background:#e7e6de;border-radius:99px;overflow:hidden}
.upload-progress i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}

/* 登录页：验证码行 & 提示 */
.code-row{display:flex;gap:8px;align-items:stretch}
.code-row input{flex:1;min-width:0}
.code-row .btn{white-space:nowrap;flex:none;padding:0 14px}
.login-tips{display:grid;gap:2px;font-size:12px;color:var(--muted);line-height:1.7}
.login-foot{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted);flex-wrap:wrap;padding-top:4px;border-top:1px solid var(--line);margin-top:2px}
.login-foot a{color:var(--brand);font-weight:600}
.login-foot code{font-size:11px}
.code-cell{background:#f2f1ea;border:1px solid #e2e0d6;padding:2px 8px;font-size:13px;letter-spacing:.06em;font-variant-numeric:tabular-nums;color:var(--ink)}
.login-card-mini{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0 4px}
.login-card-mini div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;display:grid;gap:3px}
.login-card-mini span{font-size:11px;color:var(--muted)}
.login-card-mini b{font-size:14px;font-weight:600}
.note-bar{display:flex;gap:14px;align-items:baseline;background:var(--brand-soft);border:1px solid #cfe4db;border-radius:12px;padding:13px 16px;margin-bottom:16px;font-size:13px;color:var(--ink-2);line-height:1.7}
.note-bar b{white-space:nowrap;color:var(--brand)}
@media (max-width:680px){
  .login-card-mini{grid-template-columns:1fr}
  .note-bar{flex-direction:column;gap:4px}
}

/* 注册 / 密码登录 */
.login-wrap.register .login-card{padding:26px 30px;gap:12px}
.login-wrap.register .login-card h2{font-size:20px}
.login-alt{display:flex;gap:16px;align-items:center;font-size:13px;color:var(--muted);flex-wrap:wrap}
.login-alt a{color:var(--brand);font-weight:600}
.login-alt a:hover{text-decoration:underline}
.login-register{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);padding-top:12px;border-top:1px solid var(--line)}
.login-register .btn{flex:none}
.dev-code{background:#fff6e0;border:1px solid #e8d5a8;color:#7a5a1f;border-radius:10px;padding:9px 12px;font-size:12.5px;line-height:1.6}
.dev-code code{background:#fff;border-color:#e0cda0;font-weight:700;letter-spacing:.08em}
.form-grid.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:680px){
  .login-wrap.register .login-card{padding:22px 18px}
  .form-grid.two{grid-template-columns:1fr}
}

.flash.welcome{display:flex;gap:14px;align-items:baseline;line-height:1.7}
.flash.welcome b{white-space:nowrap}
.flash.welcome code{background:#fff;border-color:#cfe4db}
@media (max-width:680px){ .flash.welcome{flex-direction:column;gap:4px} }

/* ===== 2026-10-30：固定账号 / 课后练习 / 课件 ===== */
.sponsor-line{margin:30px 0 0;font-size:12px;color:var(--muted);line-height:1.8;max-width:38ch;border-left:2px solid var(--line);padding-left:12px}
.baseline.final{background:linear-gradient(120deg,#3c3217,#5a4a22)}
.baseline.final.done{background:#fff}
.practice-card{margin-top:24px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:var(--shadow)}
.practice-card.locked{background:#fbfaf6;border-style:dashed}
.practice-card h3{margin:4px 0 6px}
.practice-card p{margin:0;font-size:13.5px;color:var(--muted)}
.practice-copy{min-width:0}
.courseware-card{margin-top:18px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px}
.courseware-card h3{margin:4px 0 0}
.courseware-list{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:8px}
.courseware-list li{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #efeee7;border-radius:11px;background:#fdfcf9}
.file-ext{flex:none;min-width:48px;text-align:center;font-size:10px;font-weight:700;letter-spacing:.05em;color:var(--brand);background:var(--brand-soft);border:1px solid #cfe4db;border-radius:7px;padding:5px 6px}
.file-main{min-width:0;flex:1;display:grid;gap:2px}
.file-main b{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-main small{font-size:11.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.courseware-group{margin-bottom:16px}
.admin-courseware{margin-top:0}
.likert{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;padding:4px 0 16px}
.likert-opt{display:grid;justify-items:center;gap:5px;padding:10px 4px;border:1px solid var(--line);border-radius:10px;background:#fdfcf9;cursor:pointer;text-align:center;font-weight:400}
.likert-opt:hover{background:#f6f5ef;border-color:#cfd8d3}
.likert-opt input{width:16px;height:16px;accent-color:var(--brand)}
.likert-score{font-size:18px;font-weight:700;color:var(--brand);line-height:1}
.likert-label{font-size:11px;color:var(--muted);line-height:1.3}
textarea{width:100%;border:1px solid var(--line);background:#fbfaf6;border-radius:11px;padding:12px 14px;font:inherit;font-size:14.5px;color:var(--ink);outline:none;resize:vertical;min-height:90px}
textarea:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(31,111,92,.1)}
.lock-card{text-align:center;display:grid;gap:12px;justify-items:center;padding:40px 24px}
.lock-card h1{font-size:28px}
.manage-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.inline-form{display:grid;gap:10px;align-content:start}
.inline-form h3{margin:0}
.inline-form p{margin:0}
.type-select{max-width:150px;flex:none}
.survey-edit .q-edit-head{flex-wrap:wrap}
.survey-edit .q-edit-head input{min-width:220px}
.type-hint{margin:0}
.report-stats{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
@media (max-width:760px){
  .practice-card{flex-direction:column;align-items:flex-start}
  .practice-card .btn{width:100%}
  .likert{grid-template-columns:1fr}
  .likert-opt{grid-template-columns:24px 1fr;justify-items:start;text-align:left;align-items:center}
  .likert-label{font-size:12.5px}
  .manage-grid{grid-template-columns:1fr}
  .courseware-list li{flex-wrap:wrap}
}