:root{
  --red:#E60012;
  --red-dark:#B3000E;
  --maroon:#2b0808;
  --cream:#FDF4F1;
  --gold:#C9A24B;
  --ink:#2b1414;
  --muted:#8a6f6f;
  --line:#f0d9d4;
  --ok:#1f9d55;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--cream);color:var(--ink);
  max-width:640px;margin:0 auto;min-height:100vh;
}
.app-header{
  background:linear-gradient(135deg,var(--maroon),var(--red));
  color:#fff;padding:16px 16px 14px;display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:12px;}
.logo{
  width:44px;height:44px;border-radius:12px;background:#fff;color:var(--red);
  display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:800;
  box-shadow:0 4px 12px rgba(0,0,0,.25);
}
.brand-txt h1{font-size:18px;margin:0;font-weight:800;letter-spacing:.5px;}
.brand-txt p{font-size:12px;margin:3px 0 0;opacity:.85;}
.overall{text-align:center;}
.ring{
  width:54px;height:54px;border-radius:50%;
  background:conic-gradient(var(--gold) 0%,rgba(255,255,255,.25) 0);
  display:flex;align-items:center;justify-content:center;position:relative;
}
.ring::before{content:"";position:absolute;inset:5px;border-radius:50%;background:var(--maroon);}
.ring span{position:relative;font-size:13px;font-weight:800;color:#fff;}
.overall-label{display:block;font-size:11px;margin-top:3px;opacity:.85;}

.tabs{display:flex;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5;}
.tab{
  flex:1;border:none;background:none;padding:13px 0;font-size:15px;font-weight:700;color:var(--muted);
  position:relative;cursor:pointer;
}
.tab.active{color:var(--red);}
.tab.active::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:40px;height:3px;border-radius:3px;background:var(--red);}

.tab-panel{display:none;padding:14px;animation:fade .2s;}
.tab-panel.active{display:block;}
@keyframes fade{from{opacity:0}to{opacity:1}}

.notice{
  background:#fff7f5;border:1px solid var(--line);border-left:4px solid var(--red);
  padding:10px 12px;border-radius:10px;font-size:13px;color:#7a3a3a;margin-bottom:14px;line-height:1.6;
}
.notice strong{color:var(--red);}

.course-grid{display:block;}
.cat-section{margin-bottom:22px;}
.cat-head{display:flex;align-items:baseline;justify-content:space-between;padding:4px 2px 8px;border-bottom:2px solid var(--line);margin-bottom:10px;}
.cat-title{font-size:18px;font-weight:800;color:var(--maroon);}
.cat-prog{font-size:12px;color:var(--muted);font-weight:700;}
.cat-desc{font-size:12px;color:var(--muted);margin:-4px 2px 12px;line-height:1.5;}
.cat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.course-card{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 12px;cursor:pointer;
  display:flex;flex-direction:column;gap:8px;transition:transform .12s,box-shadow .12s;position:relative;overflow:hidden;
}
.course-card:active{transform:scale(.97);}
.cc-badge{
  width:30px;height:30px;border-radius:9px;background:var(--red);color:#fff;font-weight:800;
  display:flex;align-items:center;justify-content:center;font-size:15px;
}
.cc-title{font-size:14px;font-weight:700;line-height:1.35;min-height:38px;}
.cc-meta{font-size:12px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;}
.cc-bar{height:6px;border-radius:6px;background:var(--line);overflow:hidden;}
.cc-bar>i{display:block;height:100%;background:var(--red);width:0;transition:width .3s;}
.cc-status{font-size:12px;font-weight:700;}
.cc-status.todo{color:var(--muted);}
.cc-status.doing{color:var(--red);}
.cc-status.done{color:var(--ok);}
.cc-status.warn{color:var(--gold);}
.cc-checkin{position:absolute;top:8px;right:8px;font-size:11px;background:var(--gold);color:#fff;padding:2px 7px;border-radius:20px;font-weight:700;}
.cc-actions{display:flex;gap:8px;margin-top:2px;}
.cc-btn{flex:1;border:none;border-radius:9px;padding:9px 6px;font-size:13px;font-weight:700;cursor:pointer;}
.cc-btn.cc-watch{background:var(--red);color:#fff;}
.cc-btn.cc-quiz{background:#fff;color:var(--red);border:1px solid var(--red);}
.cc-btn:active{transform:scale(.97);}

.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px;}
.card h2{font-size:16px;margin:0 0 12px;color:var(--maroon);}
.card label{display:block;font-size:13px;color:var(--muted);margin-bottom:12px;}
.card input{
  width:100%;margin-top:5px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:15px;
  background:var(--cream);color:var(--ink);
}
.card input:focus{outline:none;border-color:var(--red);}

.btn-primary{background:var(--red);color:#fff;border:none;border-radius:10px;padding:12px 16px;font-size:15px;font-weight:700;cursor:pointer;}
.btn-primary:disabled{background:#e9c9c9;color:#fff;cursor:not-allowed;}
.btn-primary.block{width:100%;}
.btn-ghost{background:none;border:1px solid var(--line);color:var(--red);border-radius:10px;padding:11px 16px;font-size:14px;font-weight:700;cursor:pointer;margin-top:4px;}
.btn-back{background:none;border:none;color:var(--red);font-size:15px;font-weight:700;cursor:pointer;}

.stat-row{display:flex;gap:10px;}
.stat{flex:1;text-align:center;background:var(--cream);border-radius:12px;padding:12px 4px;}
.stat b{display:block;font-size:20px;color:var(--red);}
.stat span{font-size:12px;color:var(--muted);}

.checkin-list{list-style:none;margin:0;padding:0;}
.checkin-list li{font-size:13px;padding:9px 0;border-bottom:1px dashed var(--line);display:flex;justify-content:space-between;gap:8px;}
.checkin-list li:last-child{border-bottom:none;}
.checkin-list .empty{color:var(--muted);justify-content:center;}
.checkin-list .ci-name{font-weight:700;color:var(--ink);}
.checkin-list .ci-time{color:var(--muted);white-space:nowrap;}
.hint{font-size:12px;color:var(--muted);margin:8px 0 0;text-align:center;}
#ddCard .identity{font-size:15px;color:var(--ink);margin:4px 0 8px;}
#ddCard .identity b{color:var(--red);}
.site-foot{text-align:center;padding:18px 14px 28px;}
.admin-link{display:inline-block;font-size:12px;color:var(--muted);text-decoration:none;border:1px solid var(--line);padding:7px 14px;border-radius:20px;}
.admin-link:active{color:var(--red);}

.player-modal,.cert-modal{position:fixed;inset:0;background:rgba(20,4,4,.92);z-index:50;display:flex;flex-direction:column;}
.player-modal[hidden],.cert-modal[hidden]{display:none;}
.player-box{flex:1;display:flex;flex-direction:column;}
.player-top{display:flex;align-items:center;gap:10px;padding:12px 14px;background:var(--maroon);}
.player-title{color:#fff;font-weight:700;font-size:15px;}
.video-wrap{flex:1;display:flex;align-items:center;justify-content:center;background:#000;position:relative;}
.video-wrap video{max-width:100%;max-height:100%;width:100%;}
.video-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;background:rgba(0,0,0,.78);z-index:2;text-align:center;padding:20px;font-size:16px;line-height:1.6;}
.video-loading[hidden]{display:none;}
.video-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:rgba(0,0,0,.45);color:#fff;border:none;z-index:3;cursor:pointer;font-size:0;line-height:0;}
.video-overlay[hidden]{display:none;}
.video-overlay::before{content:"";width:72px;height:72px;display:block;background:#E60012;border-radius:50%;box-shadow:0 4px 18px rgba(0,0,0,.4);}
.video-overlay span{display:block;font-size:15px;line-height:1.5;margin-top:12px;color:#fff;}
.player-foot{padding:12px 14px;background:var(--maroon);display:flex;align-items:center;gap:12px;}
.watch-hint{flex:1;color:#ffd9d9;font-size:13px;}
.watch-hint.ok{color:#9ff0c0;}

.cert-modal{align-items:center;justify-content:center;padding:16px;}
.cert-box{width:100%;max-width:360px;}
.cert-box canvas{width:100%;height:auto;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.5);}
.cert-actions{display:flex;gap:10px;margin-top:12px;}
.cert-actions .btn-primary{flex:1;}

.toast{
  position:fixed;left:50%;bottom:40px;transform:translateX(-50%);
  background:rgba(20,4,4,.92);color:#fff;padding:11px 18px;border-radius:24px;font-size:14px;z-index:99;
  animation:pop .25s;
}
.toast[hidden]{display:none;}
@keyframes pop{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}

/* ---------- 课后考核 ---------- */
.quiz-modal{position:fixed;inset:0;background:rgba(20,4,4,.94);z-index:60;display:flex;align-items:center;justify-content:center;padding:16px;}
.quiz-modal[hidden]{display:none;}
.quiz-box{width:100%;max-width:460px;max-height:90vh;background:#fff;border-radius:16px;display:flex;flex-direction:column;overflow:hidden;}
.quiz-head{background:var(--maroon);color:#fff;padding:16px;text-align:center;}
.quiz-head h3{margin:0 0 4px;font-size:18px;}
.quiz-head p{margin:0;font-size:13px;opacity:.85;}
.quiz-body{flex:1;overflow-y:auto;padding:16px 18px;}
.quiz-q{margin-bottom:18px;padding-bottom:14px;border-bottom:1px dashed var(--line);}
.quiz-q:last-child{border-bottom:none;margin-bottom:0;}
.quiz-no{display:inline-block;width:22px;height:22px;line-height:22px;text-align:center;background:var(--red);color:#fff;border-radius:50%;font-size:13px;font-weight:800;margin-right:8px;}
.quiz-qt{font-size:15px;font-weight:700;color:var(--ink);line-height:1.5;margin-bottom:10px;}
.quiz-opts{display:flex;flex-direction:column;gap:8px;}
.quiz-opt{display:flex;align-items:flex-start;gap:8px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;cursor:pointer;transition:all .12s;background:var(--cream);}
.quiz-opt input{margin-top:3px;accent-color:var(--red);}
.quiz-opt span{flex:1;font-size:14px;color:var(--ink);line-height:1.4;}
.quiz-opt:active{background:#fff0f0;}
.quiz-q.right .quiz-opt:has(input:checked){background:#e6f9ee;border-color:var(--ok);}
.quiz-q.wrong .quiz-opt:has(input:checked){background:#ffeaea;border-color:var(--red);}
.quiz-foot{padding:14px 18px 18px;border-top:1px solid var(--line);background:#fff;}
.quiz-foot .btn-primary,.quiz-foot .btn-ghost{margin-top:8px;}
.quiz-pass{color:var(--ok);font-size:15px;text-align:center;line-height:1.5;}
.quiz-fail{color:var(--red);font-size:15px;text-align:center;line-height:1.5;}
.quiz-explain{margin-top:8px;padding:8px 10px;background:rgba(0,0,0,.04);border-left:3px solid var(--gold);border-radius:6px;font-size:13px;color:var(--ink);line-height:1.5;}
.quiz-q.right .quiz-explain{border-left-color:var(--ok);}
.quiz-q.wrong .quiz-explain{border-left-color:var(--red);}
.correct-opt{background:#e6f9ee !important;border-color:var(--ok) !important;}
.quiz-foot .btn-primary[hidden],.quiz-foot .btn-ghost[hidden]{display:none;}