/* ============ 大风老师教投流 · 样式 ============ */
:root{
  --brand:#FF6A00; --brand-2:#FF9A3C; --brand-soft:#FFF3E8; --brand-deep:#E85D00;
  --ink:#16191F; --ink-2:#4B5563; --ink-3:#9099A8;
  --line:#ECEEF2; --line-2:#F5F6F9; --bg:#F5F6F9; --card:#fff;
  --green:#16A34A; --green-soft:#E9F7EF;
  --blue:#2563EB; --blue-soft:#EAF1FF;
  --red:#DC2626; --red-soft:#FDECEC;
  --amber:#D97706; --amber-soft:#FEF4E6;
  --r-s:8px; --r-m:12px; --r-l:16px; --r-x:22px;
  --sh:0 1px 2px rgba(16,24,40,.04), 0 4px 16px rgba(16,24,40,.06);
  --sh-2:0 8px 32px rgba(16,24,40,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:var(--bg); color:var(--ink); font-size:14px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;cursor:pointer}
button,input,select,textarea{font-family:inherit;font-size:inherit;outline:none;border:none;background:none;color:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.hidden{display:none !important}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* ---------- 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:38px;padding:0 18px;border-radius:var(--r-s);font-size:14px;font-weight:600;
  background:var(--card);border:1px solid var(--line);color:var(--ink-2);transition:.16s;white-space:nowrap;
}
.btn:hover{border-color:#D8DCE4;color:var(--ink);transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border:none;box-shadow:0 4px 14px rgba(255,106,0,.28)}
.btn-primary:hover{color:#fff;box-shadow:0 6px 20px rgba(255,106,0,.36)}
.btn-lg{height:46px;padding:0 26px;font-size:15px;border-radius:10px}
.btn-block{width:100%}
.btn-sm{height:30px;padding:0 12px;font-size:13px;border-radius:6px}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-danger{color:var(--red);border-color:#F5C9C9}
.btn-danger:hover{background:var(--red-soft);color:var(--red)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

.tag{display:inline-flex;align-items:center;height:22px;padding:0 8px;border-radius:4px;font-size:12px;font-weight:500;background:var(--line-2);color:var(--ink-2)}
.tag-brand{background:var(--brand-soft);color:var(--brand-deep)}
.tag-green{background:var(--green-soft);color:var(--green)}
.tag-blue{background:var(--blue-soft);color:var(--blue)}
.tag-red{background:var(--red-soft);color:var(--red)}
.tag-amber{background:var(--amber-soft);color:var(--amber)}

.card{background:var(--card);border-radius:var(--r-l);box-shadow:var(--sh);border:1px solid rgba(16,24,40,.04)}
.sec-title{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:18px}
.sec-title h2{font-size:22px;font-weight:800;letter-spacing:-.3px}
.sec-title h2 small{font-size:13px;font-weight:500;color:var(--ink-3);margin-left:8px}
.sec-title a{font-size:13px;color:var(--ink-3)}
.sec-title a:hover{color:var(--brand)}
.empty{text-align:center;padding:60px 20px;color:var(--ink-3)}
.empty .ic{font-size:44px;margin-bottom:10px;opacity:.5}

/* 表单 */
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:6px}
.input{width:100%;height:42px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-s);background:var(--card);transition:.15s}
.input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(255,106,0,.10)}
textarea.input{height:auto;padding:12px 14px;line-height:1.6;resize:vertical;min-height:88px}
select.input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%239099A8' 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}
.row{display:flex;gap:12px}
.row>*{flex:1}

/* Toast */
.toast{position:fixed;left:50%;top:80px;transform:translateX(-50%) translateY(-16px);z-index:9999;
  background:rgba(22,25,31,.94);color:#fff;padding:11px 20px;border-radius:10px;font-size:14px;
  opacity:0;pointer-events:none;transition:.24s;box-shadow:var(--sh-2);max-width:80vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Modal */
.modal-mask{position:fixed;inset:0;background:rgba(16,20,28,.5);z-index:9998;display:flex;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(3px)}
.modal{background:var(--card);border-radius:var(--r-x);width:100%;max-width:480px;max-height:86vh;overflow:auto;box-shadow:var(--sh-2);animation:pop .2s ease}
@keyframes pop{from{opacity:0;transform:scale(.96) translateY(8px)}to{opacity:1;transform:none}}
.modal-head{padding:20px 24px 12px;font-size:17px;font-weight:800}
.modal-body{padding:0 24px 8px}
.modal-foot{padding:12px 24px 22px;display:flex;gap:10px;justify-content:flex-end}
.modal .close{position:absolute;right:16px;top:14px;font-size:20px;color:var(--ink-3)}

/* ============ 学员端 · 头部 ============ */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:22px;height:64px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:17px;box-shadow:0 3px 10px rgba(255,106,0,.3)}
.brand-logo.small{width:32px;height:32px;font-size:15px;border-radius:9px}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:16px;font-weight:800;letter-spacing:-.2px}
.brand-text i{font-style:normal;font-size:11px;color:var(--ink-3)}
.header-search{flex:1;max-width:340px;display:flex;height:36px;border:1px solid var(--line);border-radius:20px;background:var(--line-2);overflow:hidden;transition:.15s}
.header-search:focus-within{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(255,106,0,.08)}
.header-search input{flex:1;padding:0 14px;background:none;font-size:13px}
.header-search button{padding:0 16px;background:var(--brand);color:#fff;font-size:13px;font-weight:600}
.header-nav{display:flex;gap:4px;margin-left:auto}
.header-nav a{padding:7px 13px;border-radius:8px;font-size:14px;font-weight:600;color:var(--ink-2);transition:.15s}
.header-nav a:hover{background:var(--line-2);color:var(--ink)}
.header-nav a.active{color:var(--brand);background:var(--brand-soft)}
.header-nav a.nav-admin{color:var(--ink-3);font-weight:500}
.header-user{display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#FFB36B,#FF7A18);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0}
.avatar.sm{width:28px;height:28px;font-size:12px}
.avatar.lg{width:56px;height:56px;font-size:22px}

/* ---------- 首页 ---------- */
.hero{background:linear-gradient(125deg,#1F2430 0%,#2E3548 45%,#3A2A20 100%);color:#fff;padding:52px 0 62px;position:relative;overflow:hidden}
.hero:before{content:'';position:absolute;right:-120px;top:-120px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(255,140,40,.32),transparent 66%)}
.hero:after{content:'';position:absolute;left:-80px;bottom:-160px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(255,106,0,.18),transparent 70%)}
.hero .wrap{position:relative;z-index:1;display:flex;align-items:center;gap:48px}
.hero-txt{flex:1;min-width:0}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);
  padding:5px 12px;border-radius:20px;font-size:12px;margin-bottom:18px}
.hero h1{font-size:40px;line-height:1.22;font-weight:900;letter-spacing:-1px;margin-bottom:14px}
.hero h1 em{font-style:normal;background:linear-gradient(100deg,#FFB36B,#FF7A18);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:15px;color:rgba(255,255,255,.72);margin-bottom:24px;max-width:460px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:34px;padding-top:26px;border-top:1px solid rgba(255,255,255,.14)}
.hero-stats div b{display:block;font-size:24px;font-weight:800;letter-spacing:-.5px}
.hero-stats div span{font-size:12px;color:rgba(255,255,255,.6)}
.hero-card{width:300px;flex-shrink:0;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);
  border-radius:var(--r-x);padding:22px;backdrop-filter:blur(8px)}
.hero-card h4{font-size:13px;color:rgba(255,255,255,.65);font-weight:600;margin-bottom:14px}
.hero-card .hi{display:flex;gap:12px;padding:11px 0;border-top:1px solid rgba(255,255,255,.1)}
.hero-card .hi:first-of-type{border-top:none;padding-top:0}
.hero-card .hi i{font-style:normal;font-size:18px}
.hero-card .hi b{display:block;font-size:13px;font-weight:600}
.hero-card .hi span{font-size:12px;color:rgba(255,255,255,.55)}

.cats{display:flex;gap:10px;overflow-x:auto;padding:4px 0 2px;margin-bottom:22px;scrollbar-width:none}
.cats::-webkit-scrollbar{display:none}
.cat-pill{flex-shrink:0;padding:8px 18px;border-radius:20px;background:var(--card);border:1px solid var(--line);font-size:14px;font-weight:600;color:var(--ink-2);transition:.15s}
.cat-pill:hover{border-color:var(--brand);color:var(--brand)}
.cat-pill.on{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border-color:transparent}

.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:20px}
.course-card{background:var(--card);border-radius:var(--r-l);overflow:hidden;box-shadow:var(--sh);border:1px solid rgba(16,24,40,.04);
  transition:.2s;display:flex;flex-direction:column;cursor:pointer}
.course-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2)}
.cc-cover{height:140px;position:relative;display:flex;align-items:center;justify-content:center;font-size:44px;overflow:hidden}
.cc-cover:after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.14),rgba(0,0,0,.06))}
.cc-cover .lv{position:absolute;left:10px;top:10px;background:rgba(0,0,0,.35);backdrop-filter:blur(4px);color:#fff;
  font-size:11px;padding:3px 9px;border-radius:20px;z-index:1}
.cc-cover .free{position:absolute;right:10px;top:10px;background:rgba(255,255,255,.94);color:var(--brand-deep);
  font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;z-index:1}
.cc-body{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1}
.cc-body h3{font-size:15px;font-weight:700;line-height:1.4;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:42px}
.cc-sub{font-size:12.5px;color:var(--ink-3);margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.cc-meta{display:flex;gap:12px;font-size:12px;color:var(--ink-3);margin-bottom:12px}
.cc-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:10px;border-top:1px solid var(--line-2)}
.price{color:var(--brand-deep);font-weight:800;font-size:19px;letter-spacing:-.5px}
.price small{font-size:12px;font-weight:600}
.price del{font-size:12px;color:var(--ink-3);font-weight:500;margin-left:6px}
.price.free{color:var(--green)}

.banner-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:36px 0}
.mini-stat{background:var(--card);border-radius:var(--r-m);padding:18px;border:1px solid var(--line);display:flex;align-items:center;gap:14px}
.mini-stat i{font-size:26px;width:46px;height:46px;border-radius:12px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.mini-stat b{display:block;font-size:20px;font-weight:800;letter-spacing:-.4px}
.mini-stat span{font-size:12.5px;color:var(--ink-3)}

.teacher-box{background:linear-gradient(120deg,#FFF8F1,#FFF);border:1px solid #FFE6CE;border-radius:var(--r-x);padding:30px;display:flex;gap:26px;align-items:center;margin:36px 0}
.teacher-box .avatar.lg{box-shadow:0 6px 20px rgba(255,106,0,.25)}
.teacher-box h3{font-size:19px;font-weight:800;margin-bottom:4px}
.teacher-box .tt{font-size:13px;color:var(--brand-deep);font-weight:600;margin-bottom:10px}
.teacher-box p{font-size:13.5px;color:var(--ink-2);margin-bottom:12px}
.tb-tags{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- 课程详情 ---------- */
.cd-top{background:linear-gradient(135deg,#232936,#39404F);color:#fff;padding:30px 0 34px}
.cd-crumb{font-size:13px;color:rgba(255,255,255,.55);margin-bottom:14px}
.cd-crumb a:hover{color:#fff}
.cd-top .wrap{display:flex;gap:30px;align-items:flex-start}
.cd-info{flex:1;min-width:0}
.cd-info h1{font-size:26px;font-weight:800;line-height:1.35;margin-bottom:8px;letter-spacing:-.4px}
.cd-info .sub{font-size:14px;color:rgba(255,255,255,.68);margin-bottom:14px}
.cd-meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.65);margin-bottom:16px}
.cd-tags{display:flex;gap:8px;flex-wrap:wrap}
.cd-tags span{background:rgba(255,255,255,.12);padding:3px 10px;border-radius:20px;font-size:12px}
.cd-buy{width:280px;flex-shrink:0;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:var(--r-l);padding:20px;backdrop-filter:blur(6px)}
.cd-buy .price{color:#FFB36B;font-size:30px}
.cd-buy .price del{color:rgba(255,255,255,.4)}
.cd-buy .btn{margin-top:14px}
.cd-buy .tip{font-size:12px;color:rgba(255,255,255,.5);margin-top:10px;text-align:center}
.cd-buy .prog{margin-top:14px}
.prog-bar{height:6px;border-radius:6px;background:rgba(255,255,255,.16);overflow:hidden}
.prog-bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--brand),var(--brand-2));transition:.3s}
.prog-bar.dark{background:var(--line)}
.prog-txt{display:flex;justify-content:space-between;font-size:12px;color:rgba(255,255,255,.6);margin-bottom:6px}
.prog-txt.dark{color:var(--ink-3)}

.cd-body{display:grid;grid-template-columns:1fr 300px;gap:26px;padding:28px 0 50px;align-items:start}
.cd-panel{background:var(--card);border-radius:var(--r-l);padding:24px;box-shadow:var(--sh);border:1px solid rgba(16,24,40,.04);margin-bottom:20px}
.cd-panel h3{font-size:16px;font-weight:800;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.cd-panel h3:before{content:'';width:3px;height:15px;border-radius:3px;background:var(--brand)}
.rich{font-size:14.5px;color:var(--ink-2);line-height:1.85}
.rich p{margin-bottom:12px}
.rich strong{color:var(--ink);font-weight:700}
.chap-list{border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden}
.chap{display:flex;align-items:center;gap:12px;padding:13px 16px;border-bottom:1px solid var(--line-2);transition:.14s;cursor:pointer}
.chap:last-child{border-bottom:none}
.chap:hover{background:var(--line-2)}
.chap.locked:hover{background:var(--card)}
.chap .no{width:26px;height:26px;border-radius:50%;background:var(--line-2);color:var(--ink-3);font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;flex-shrink:0}
.chap.done .no{background:var(--green-soft);color:var(--green)}
.chap.cur .no{background:var(--brand);color:#fff}
.chap .tt{flex:1;min-width:0}
.chap .tt b{display:block;font-size:14px;font-weight:600}
.chap .tt span{font-size:12px;color:var(--ink-3)}
.chap .du{font-size:12.5px;color:var(--ink-3);flex-shrink:0}
.chap .act{font-size:12.5px;font-weight:600;color:var(--brand);flex-shrink:0}
.chap .act.lock{color:var(--ink-3)}

.cd-side{position:sticky;top:84px}
.mini-teacher{display:flex;gap:12px;align-items:center;margin-bottom:14px}
.mini-teacher b{display:block;font-size:15px}
.mini-teacher span{font-size:12px;color:var(--ink-3)}
.side-list li{display:flex;justify-content:space-between;font-size:13px;padding:9px 0;border-bottom:1px solid var(--line-2)}
.side-list li:last-child{border:none}
.side-list li span{color:var(--ink-3)}

/* ---------- 学习页 ---------- */
.learn{display:grid;grid-template-columns:1fr 330px;gap:20px;padding:20px 0;align-items:start}
.player{background:#0E1116;border-radius:var(--r-l);overflow:hidden;position:relative;aspect-ratio:16/9;display:flex;flex-direction:column;justify-content:flex-end}
.player-bg{position:absolute;inset:0;background:radial-gradient(circle at 50% 40%,#2A3140,#0E1116 70%);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px}
.player-bg .glow{font-size:60px;filter:drop-shadow(0 6px 24px rgba(255,140,40,.4))}
.player-bg .pt{color:rgba(255,255,255,.9);font-size:16px;font-weight:700;max-width:70%;text-align:center;line-height:1.5}
.player-bg .ps{color:rgba(255,255,255,.45);font-size:12.5px}
.player-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.25);transition:.2s}
.player-play .pb{width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.94);display:flex;align-items:center;justify-content:center;
  font-size:22px;color:#16191F;box-shadow:0 8px 28px rgba(0,0,0,.35);transition:.2s;pointer-events:auto}
.player-play:hover .pb{transform:scale(1.08)}
.player-bar{position:relative;z-index:2;padding:12px 16px;background:linear-gradient(180deg,transparent,rgba(0,0,0,.75))}
.pb-track{height:5px;border-radius:5px;background:rgba(255,255,255,.25);cursor:pointer;position:relative}
.pb-fill{height:100%;border-radius:5px;background:linear-gradient(90deg,var(--brand),var(--brand-2));position:relative}
.pb-fill:after{content:'';position:absolute;right:-5px;top:50%;transform:translateY(-50%);width:11px;height:11px;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.4)}
.pb-ctrl{display:flex;align-items:center;gap:14px;margin-top:10px;color:#fff}
.pb-ctrl button{color:#fff;font-size:15px;opacity:.85}
.pb-ctrl button:hover{opacity:1}
.pb-ctrl .tm{font-size:12px;opacity:.75;font-variant-numeric:tabular-nums}
.pb-ctrl .sp{margin-left:auto}
.player-tip{position:absolute;right:12px;top:12px;background:rgba(0,0,0,.4);color:rgba(255,255,255,.7);font-size:11px;padding:4px 10px;border-radius:20px;z-index:2}
.v-el{position:absolute;inset:0;width:100%;height:100%;background:#000;object-fit:contain;z-index:0}

/* 视频上传区 */
.vup{border:1px solid var(--line);border-radius:var(--r-m);padding:12px}
.vup-tabs{display:flex;gap:6px;margin-bottom:12px}
.vup-tabs button{border:1px solid var(--line);background:var(--card);color:var(--ink-2);border-radius:8px;padding:5px 14px;font-size:13px;cursor:pointer}
.vup-tabs button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.vup-drop{border:1.5px dashed var(--line);border-radius:10px;padding:22px 14px;text-align:center;color:var(--ink-2);font-size:13.5px;cursor:pointer;transition:.15s}
.vup-drop:hover,.vup-drop.over{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-deep)}
.vup-drop span{display:block;margin-top:4px;font-size:12px;color:var(--ink-3)}
.vup-hint{margin-top:8px;font-size:12px;color:var(--ink-3);line-height:1.6}
.vup-bar{margin-top:10px;height:20px;border-radius:10px;background:var(--line-2);position:relative;overflow:hidden}
.vup-fill{height:100%;width:0;background:var(--brand);transition:width .15s}
.vup-bar span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--ink);font-weight:600}
.vup-cur{margin-top:12px}
.vup-none{font-size:12.5px;color:var(--ink-3);background:var(--line-2);border-radius:8px;padding:10px 12px}
.vup-ok{display:flex;align-items:center;gap:10px;background:var(--green-soft);border:1px solid rgba(22,163,74,.25);border-radius:10px;padding:10px 12px}
.vup-ic{font-size:20px}
.vup-meta{flex:1;min-width:0}
.vup-meta b{display:block;font-size:13px}
.vup-meta span{display:block;font-size:12px;color:var(--ink-3);word-break:break-all}
.vup-list{margin-top:10px;border-top:1px solid var(--line);padding-top:10px}
.vup-row{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--line-2);font-size:13px}
.vup-row:last-child{border-bottom:0}
.vup-row .vup-meta span{font-size:11.5px}
.vup-row .vd{font-size:11px;padding:2px 8px;border-radius:20px;background:var(--line-2);color:var(--ink-3)}
.vup-row .vd.on{background:var(--green-soft);color:var(--green)}

.learn-main .lhead{padding:16px 0 0}
.learn-main h2{font-size:19px;font-weight:800;line-height:1.4;margin-bottom:8px}
.learn-main .lmeta{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--ink-3);margin-bottom:14px}
.learn-tabs{display:flex;gap:22px;border-bottom:1px solid var(--line);margin-top:18px}
.learn-tabs button{padding:10px 0;font-size:14px;font-weight:600;color:var(--ink-3);border-bottom:2px solid transparent;margin-bottom:-1px}
.learn-tabs button.on{color:var(--brand);border-color:var(--brand)}
.tab-pane{padding:18px 0}
.note-editor{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.note-editor textarea{width:100%;min-height:76px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r-m);resize:vertical;font-size:14px;line-height:1.6}
.note-editor textarea:focus{border-color:var(--brand)}
.note-item{padding:14px;border:1px solid var(--line);border-radius:var(--r-m);margin-bottom:10px}
.note-item .nh{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.note-item .nh b{font-size:13px}
.note-item .nh span{font-size:12px;color:var(--ink-3);display:flex;gap:10px;align-items:center}
.note-item p{font-size:13.5px;color:var(--ink-2);white-space:pre-wrap}

.dir-panel{background:var(--card);border-radius:var(--r-l);box-shadow:var(--sh);border:1px solid rgba(16,24,40,.04);overflow:hidden}
.dir-head{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.dir-head b{font-size:15px}
.dir-head span{font-size:12.5px;color:var(--ink-3)}
.dir-body{max-height:calc(100vh - 260px);overflow-y:auto}
.dir-chap{display:flex;gap:11px;padding:12px 18px;border-bottom:1px solid var(--line-2);cursor:pointer;transition:.14s}
.dir-chap:hover{background:var(--line-2)}
.dir-chap.on{background:var(--brand-soft)}
.dir-chap.on .dno{background:var(--brand);color:#fff}
.dir-chap.done .dno{background:var(--green-soft);color:var(--green)}
.dno{width:24px;height:24px;border-radius:50%;background:var(--line-2);color:var(--ink-3);font-size:11px;font-weight:700;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
.dtt{flex:1;min-width:0}
.dtt b{display:block;font-size:13.5px;font-weight:600;line-height:1.45}
.dtt span{font-size:11.5px;color:var(--ink-3)}

/* ---------- 我的 ---------- */
.mine-hero{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;padding:26px 0 30px}
.mine-hero .wrap{display:flex;align-items:center;gap:18px}
.mine-hero .mh-i{flex:1;min-width:0}
.mine-hero h2{font-size:21px;font-weight:800;margin-bottom:4px}
.mine-hero p{font-size:13px;color:rgba(255,255,255,.85)}
.mine-hero .avatar{border:2px solid rgba(255,255,255,.6);width:56px;height:56px;font-size:22px}
.mh-stats{display:flex;gap:30px}
.mh-stats div b{display:block;font-size:22px;font-weight:800}
.mh-stats div span{font-size:12px;opacity:.85}
.stat-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0 24px}
.sc{background:var(--card);border-radius:var(--r-m);padding:18px;border:1px solid var(--line);text-align:center}
.sc b{display:block;font-size:24px;font-weight:800;color:var(--brand-deep);letter-spacing:-.5px}
.sc span{font-size:12.5px;color:var(--ink-3)}

.my-course{display:flex;gap:14px;padding:14px;border:1px solid var(--line);border-radius:var(--r-m);margin-bottom:12px;background:var(--card);transition:.15s;cursor:pointer}
.my-course:hover{border-color:var(--brand);box-shadow:var(--sh)}
.mc-cover{width:112px;height:70px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:26px;flex-shrink:0}
.mc-i{flex:1;min-width:0}
.mc-i b{display:block;font-size:14.5px;font-weight:700;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mc-i .mc-m{font-size:12px;color:var(--ink-3);margin-bottom:8px}
.mc-i .prog-bar{height:5px}
.mc-act{display:flex;flex-direction:column;justify-content:center;flex-shrink:0;padding-left:8px}

/* ---------- 登录 ---------- */
.auth-wrap{min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;padding:40px 20px;
  background:linear-gradient(135deg,#FFF6EE 0%,#F5F6F9 45%,#EAF0FF 100%)}
.auth-box{width:100%;max-width:400px;background:var(--card);border-radius:var(--r-x);padding:34px;box-shadow:var(--sh-2)}
.auth-box .lg{text-align:center;margin-bottom:24px}
.auth-box .lg .brand-logo{width:48px;height:48px;font-size:22px;margin:0 auto 12px}
.auth-box h2{font-size:21px;font-weight:800;margin-bottom:4px}
.auth-box .lg p{font-size:13px;color:var(--ink-3)}
.auth-tabs{display:flex;gap:6px;background:var(--line-2);padding:4px;border-radius:10px;margin-bottom:22px}
.auth-tabs button{flex:1;height:34px;border-radius:7px;font-size:14px;font-weight:600;color:var(--ink-2)}
.auth-tabs button.on{background:var(--card);color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.auth-hint{margin-top:16px;padding:12px 14px;background:var(--brand-soft);border-radius:var(--r-s);font-size:12.5px;color:var(--brand-deep);line-height:1.7}
.auth-hint b{font-weight:700}

/* ---------- 页脚 / 底部导航 ---------- */
.site-footer{background:#1C2029;color:rgba(255,255,255,.6);padding:36px 0 44px;margin-top:40px;text-align:center}
.site-footer .footer-brand{font-size:17px;font-weight:800;color:#fff;margin-bottom:10px}
.site-footer p{font-size:13px;margin-bottom:6px}
.site-footer .footer-dim{font-size:12px;color:rgba(255,255,255,.35);margin-top:14px}
.tabbar{display:none}

/* ============ 管理台 ============ */
#app-admin{display:flex;min-height:100vh;background:var(--bg)}
.admin-side{width:222px;background:#191D26;color:rgba(255,255,255,.75);display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:50}
.admin-brand{display:flex;align-items:center;gap:10px;padding:20px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.admin-brand b{display:block;color:#fff;font-size:15px;font-weight:700}
.admin-brand i{font-style:normal;font-size:11px;color:rgba(255,255,255,.4)}
.side-menu{padding:14px 10px;flex:1}
.side-menu a{display:flex;align-items:center;gap:11px;padding:11px 14px;border-radius:9px;font-size:14px;margin-bottom:3px;transition:.15s;color:rgba(255,255,255,.72)}
.side-menu a span{font-size:15px;width:18px;text-align:center}
.side-menu a:hover{background:rgba(255,255,255,.07);color:#fff}
.side-menu a.on{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:600;box-shadow:0 4px 14px rgba(255,106,0,.3)}
.side-foot{padding:14px 18px;border-top:1px solid rgba(255,255,255,.08);font-size:12.5px}
.side-foot a{color:rgba(255,255,255,.55);display:block;margin-bottom:10px}
.side-foot a:hover{color:#fff}
.side-foot .au{display:flex;align-items:center;gap:8px;color:#fff;font-size:13px}
.side-foot .au .avatar{width:28px;height:28px;font-size:12px}
.admin-body{flex:1;margin-left:222px;min-width:0}
.admin-topbar{height:56px;background:var(--card);border-bottom:1px solid var(--line);display:flex;align-items:center;position:sticky;top:0;z-index:40}
.admin-topbar span{font-size:15px;font-weight:700}
#admin-main{padding:22px 24px 40px}

.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}
.kpi{background:var(--card);border-radius:var(--r-l);padding:20px;border:1px solid var(--line);position:relative;overflow:hidden}
.kpi:after{content:'';position:absolute;right:-20px;top:-20px;width:80px;height:80px;border-radius:50%;background:var(--brand-soft);opacity:.55}
.kpi .kl{font-size:13px;color:var(--ink-3);margin-bottom:8px;position:relative}
.kpi .kv{font-size:28px;font-weight:800;letter-spacing:-1px;position:relative;line-height:1.1}
.kpi .kv small{font-size:14px;font-weight:600;margin-left:2px}
.kpi .kd{font-size:12px;color:var(--ink-3);margin-top:6px;position:relative}
.kpi .kd em{font-style:normal;color:var(--green);font-weight:600}
.kpi .ki{position:absolute;right:18px;top:18px;font-size:20px;opacity:.85}

.grid-2{display:grid;grid-template-columns:1.55fr 1fr;gap:18px;margin-bottom:18px}
.panel{background:var(--card);border-radius:var(--r-l);border:1px solid var(--line);overflow:hidden}
.panel-head{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.panel-head b{font-size:15px;font-weight:700}
.panel-head .ph-a{font-size:13px;color:var(--ink-3)}
.panel-body{padding:18px 20px}

.chart{display:flex;align-items:flex-end;gap:6px;height:190px;padding-top:10px}
.chart .cb{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end;position:relative}
.chart .cbb{width:100%;max-width:30px;border-radius:5px 5px 2px 2px;background:linear-gradient(180deg,var(--brand-2),var(--brand));transition:.25s;min-height:3px;position:relative}
.chart .cb:hover .cbb{background:linear-gradient(180deg,#FFB36B,var(--brand-deep))}
.chart .cb .cl{font-size:10.5px;color:var(--ink-3);white-space:nowrap}
.chart .cv{font-size:11px;font-weight:700;color:var(--brand-deep)}
.chart-tip{position:absolute;bottom:calc(100% + 6px);left:50%;transform:translateX(-50%);background:#16191F;color:#fff;font-size:11.5px;
  padding:5px 9px;border-radius:6px;white-space:nowrap;opacity:0;pointer-events:none;transition:.15s;z-index:3}
.chart .cb:hover .chart-tip{opacity:1}

.rank-list li{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid var(--line-2)}
.rank-list li:last-child{border:none}
.rk-no{width:22px;height:22px;border-radius:6px;background:var(--line-2);color:var(--ink-3);font-size:11px;font-weight:800;
  display:flex;align-items:center;justify-content:center;flex-shrink:0}
.rank-list li:nth-child(1) .rk-no{background:linear-gradient(135deg,#FFB36B,var(--brand));color:#fff}
.rank-list li:nth-child(2) .rk-no{background:#D7DBE2;color:#fff}
.rank-list li:nth-child(3) .rk-no{background:#E4C9A8;color:#fff}
.rk-t{flex:1;min-width:0}
.rk-t b{display:block;font-size:13.5px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rk-t span{font-size:11.5px;color:var(--ink-3)}
.rk-v{font-size:13.5px;font-weight:700;color:var(--brand-deep);flex-shrink:0}

.donut-wrap{display:flex;align-items:center;gap:20px}
.donut{width:120px;height:120px;border-radius:50%;flex-shrink:0;position:relative}
.donut:after{content:'';position:absolute;inset:26px;background:var(--card);border-radius:50%}
.legend{flex:1;min-width:0}
.legend li{display:flex;align-items:center;gap:8px;font-size:13px;padding:5px 0}
.legend li i{width:9px;height:9px;border-radius:3px;flex-shrink:0}
.legend li span{color:var(--ink-3);margin-left:auto;font-size:12.5px}

/* 表格 */
.table{width:100%;border-collapse:collapse}
.table th{font-size:12.5px;font-weight:600;color:var(--ink-3);text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);background:var(--line-2);white-space:nowrap}
.table td{font-size:13.5px;padding:13px 14px;border-bottom:1px solid var(--line-2);vertical-align:middle}
.table tr:last-child td{border-bottom:none}
.table tbody tr{transition:.12s}
.table tbody tr:hover{background:var(--line-2)}
.table .cell-u{display:flex;align-items:center;gap:9px}
.table .cell-u .avatar{width:30px;height:30px;font-size:12.5px}
.table .cell-u b{display:block;font-size:13.5px;font-weight:600}
.table .cell-u span{font-size:11.5px;color:var(--ink-3)}
.table .ops{display:flex;gap:6px;justify-content:flex-end}
.table .ops button{padding:4px 9px;border-radius:5px;font-size:12.5px;font-weight:600;color:var(--brand);background:var(--brand-soft)}
.table .ops button:hover{background:#FFE6D1}
.table .ops button.danger{color:var(--red);background:var(--red-soft)}
.tbar{display:flex;gap:10px;align-items:center;padding:14px 20px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.tbar .input{height:36px;width:auto;min-width:190px}
.tbar .sp{margin-left:auto}
.tbar .cnt{font-size:13px;color:var(--ink-3)}

.mprog{display:inline-flex;align-items:center;gap:8px;min-width:96px}
.mprog .prog-bar{flex:1;height:5px;background:var(--line)}
.mprog span{font-size:12px;color:var(--ink-3);width:32px;text-align:right;font-variant-numeric:tabular-nums}

/* 目录树（课程管理） */
.ctree{margin-top:8px}
.cnode{border:1px solid var(--line);border-radius:var(--r-m);margin-bottom:12px;overflow:hidden}
.cnode-h{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--line-2);cursor:pointer}
.cnode-h .caret{transition:.2s;font-size:11px;color:var(--ink-3);width:12px}
.cnode-h.open .caret{transform:rotate(90deg)}
.cnode-h .ci{width:44px;height:30px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.cnode-h b{font-size:14.5px;font-weight:700;flex:1;min-width:0}
.cnode-h .cm{font-size:12px;color:var(--ink-3);display:flex;gap:14px;flex-shrink:0}
.cnode-b{padding:6px 0}
.sec-row{display:flex;align-items:center;gap:12px;padding:10px 16px 10px 44px;border-bottom:1px solid var(--line-2);font-size:13.5px}
.sec-row:last-child{border-bottom:none}
.sec-row:hover{background:var(--line-2)}
.sec-row .sn{font-size:12px;color:var(--ink-3);width:22px;flex-shrink:0}
.sec-row .st{flex:1;min-width:0}
.sec-row .sd{font-size:12.5px;color:var(--ink-3);flex-shrink:0}
.cnode-f{padding:10px 16px;border-top:1px solid var(--line);background:var(--card);display:flex;gap:8px}
.cnode-f .input{height:32px;font-size:13px}

/* 学员详情抽屉 */
.sd-head{display:flex;gap:16px;align-items:center;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:16px}
.sd-head .avatar{width:52px;height:52px;font-size:20px}
.sd-head h3{font-size:18px;font-weight:800}
.sd-head p{font-size:13px;color:var(--ink-3)}
.sd-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:18px}
.sd-g{background:var(--line-2);border-radius:var(--r-m);padding:12px;text-align:center}
.sd-g b{display:block;font-size:19px;font-weight:800;color:var(--brand-deep)}
.sd-g span{font-size:12px;color:var(--ink-3)}
.grant-item{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--line-2)}
.grant-item:last-child{border:none}
.grant-item .gt{flex:1;min-width:0;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.switch{width:40px;height:22px;border-radius:20px;background:#D7DBE2;position:relative;transition:.2s;flex-shrink:0}
.switch:after{content:'';position:absolute;left:2px;top:2px;width:18px;height:18px;border-radius:50%;background:#fff;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.switch.on{background:var(--brand)}
.switch.on:after{transform:translateX(18px)}

.pager{display:flex;gap:6px;justify-content:center;padding:16px}
.pager button{min-width:32px;height:32px;border-radius:6px;border:1px solid var(--line);font-size:13px;color:var(--ink-2);background:var(--card)}
.pager button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.pager button:disabled{opacity:.4}

/* ============ 响应式 ============ */
@media (max-width:1000px){
  .cd-body{grid-template-columns:1fr}
  .cd-side{position:static}
  .learn{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .banner-strip,.stat-cards{grid-template-columns:repeat(2,1fr)}
  .kpis{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .header-search,.header-nav{display:none}
  .hero .wrap{flex-direction:column;gap:28px}
  .hero h1{font-size:29px}
  .hero-card{width:100%}
  .hero-stats{gap:22px}
  .cd-top .wrap{flex-direction:column;gap:20px}
  .cd-buy{width:100%}
  .teacher-box{flex-direction:column;text-align:center}
  .tb-tags{justify-content:center}
  .course-grid{grid-template-columns:1fr}
  .mine-hero .wrap{flex-wrap:wrap}
  .mh-stats{width:100%;justify-content:space-between;gap:12px}
  .sd-grid{grid-template-columns:repeat(2,1fr)}
  .wrap{padding:0 14px}
  .site-footer{margin-bottom:60px}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
    border-top:1px solid var(--line);z-index:100;padding:5px 0 calc(5px + env(safe-area-inset-bottom))}
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--ink-3);padding:4px 0}
  .tabbar a span{font-size:19px;line-height:1}
  .tabbar a.on{color:var(--brand);font-weight:700}
  #admin-main{padding:16px 14px 40px}
  .admin-side{width:64px}
  .admin-brand div,.side-menu a span:not(:first-child),.side-foot{display:none}
  .admin-brand{justify-content:center;padding:16px 0}
  .side-menu a{justify-content:center;padding:13px 0;font-size:17px}
  .admin-body{margin-left:64px}
  .hero{padding:34px 0 42px}
}

/* ============ 考试 / 题库 / 证书 ============ */
.exam-wrap{max-width:820px;margin:0 auto;padding:24px 20px 60px}
.exam-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.exam-head h1{font-size:21px;font-weight:800;flex:1;min-width:200px}
.exam-timer{display:flex;align-items:center;gap:7px;background:var(--card);border:1px solid var(--line);
  padding:7px 14px;border-radius:20px;font-size:14px;font-weight:700;font-variant-numeric:tabular-nums}
.exam-timer.warn{color:var(--red);border-color:#F5C9C9;background:var(--red-soft)}
.q-card{background:var(--card);border-radius:var(--r-l);border:1px solid var(--line);padding:20px;margin-bottom:14px}
.q-h{display:flex;gap:10px;margin-bottom:14px}
.q-no{width:24px;height:24px;border-radius:6px;background:var(--brand);color:#fff;font-size:12px;font-weight:800;
  display:flex;align-items:center;justify-content:center;flex-shrink:0}
.q-h .qt{flex:1;font-size:15px;font-weight:600;line-height:1.6}
.q-type{font-size:11px;padding:2px 7px;border-radius:4px;background:var(--brand-soft);color:var(--brand-deep);
  font-weight:600;flex-shrink:0;height:19px;line-height:15px}
.q-type.multiple{background:var(--blue-soft);color:var(--blue)}
.q-type.judge{background:var(--green-soft);color:var(--green)}
.q-opts{display:flex;flex-direction:column;gap:9px;padding-left:34px}
.q-opt{display:flex;align-items:center;gap:11px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r-m);
  cursor:pointer;transition:.14s;font-size:14px}
.q-opt:hover{border-color:var(--brand);background:var(--brand-soft)}
.q-opt.on{border-color:var(--brand);background:var(--brand-soft);font-weight:600}
.q-opt .ok{width:22px;height:22px;border-radius:50%;border:1.5px solid #D5D9E0;display:flex;align-items:center;
  justify-content:center;font-size:12px;font-weight:700;color:var(--ink-3);flex-shrink:0;transition:.14s}
.q-opt.on .ok{border-color:var(--brand);background:var(--brand);color:#fff}
.q-opt.right{border-color:var(--green);background:var(--green-soft)}
.q-opt.right .ok{border-color:var(--green);background:var(--green);color:#fff}
.q-opt.wrong{border-color:var(--red);background:var(--red-soft)}
.q-opt.wrong .ok{border-color:var(--red);background:var(--red);color:#fff}
.q-analysis{margin-top:14px;padding:12px 14px;background:var(--line-2);border-radius:var(--r-m);
  font-size:13px;color:var(--ink-2);line-height:1.75}
.q-analysis b{color:var(--ink)}
.exam-sub{position:sticky;bottom:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);
  padding:14px 18px;display:flex;align-items:center;gap:12px;box-shadow:0 -4px 20px rgba(16,24,40,.06);margin-top:8px}
.q-nav{display:flex;flex-wrap:wrap;gap:6px;flex:1}
.q-nav button{width:30px;height:30px;border-radius:6px;border:1px solid var(--line);font-size:12.5px;
  background:var(--card);color:var(--ink-3);font-weight:600}
.q-nav button.done{background:var(--brand);color:#fff;border-color:var(--brand)}
.q-nav button.on{border-color:var(--brand);color:var(--brand);box-shadow:0 0 0 2px rgba(255,106,0,.15)}

/* 成绩页 */
.result{background:linear-gradient(135deg,#1F2430,#333B4D);color:#fff;border-radius:var(--r-x);padding:38px;text-align:center;margin-bottom:20px}
.result .rs{position:relative;width:120px;height:120px;border-radius:50%;margin:0 auto 18px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;background:conic-gradient(var(--brand) calc(var(--p)*1%),rgba(255,255,255,.14) 0)}
.result .rs:before{content:'';position:absolute;width:98px;height:98px;border-radius:50%;background:#252B39}
.result .rs-in{position:relative;z-index:1}
.result .rs b{display:block;font-size:36px;font-weight:800;line-height:1.1;letter-spacing:-1px}
.result .rs span{font-size:12px;color:rgba(255,255,255,.55)}
.result h2{font-size:22px;font-weight:800;margin-bottom:8px}
.result p{font-size:14px;color:rgba(255,255,255,.7)}
.result .rstat{display:flex;justify-content:center;gap:34px;margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14)}
.result .rstat div b{display:block;font-size:19px;font-weight:800}
.result .rstat div span{font-size:12px;color:rgba(255,255,255,.55)}
.result-btns{display:flex;gap:10px;justify-content:center;margin-top:22px}

/* 证书 */
.cert{background:linear-gradient(135deg,#FFFDF8,#FFF6E9);border:2px solid #F0DCC0;border-radius:var(--r-l);
  padding:28px 30px;position:relative;overflow:hidden}
.cert:before{content:'';position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,180,100,.22),transparent 70%)}
.cert:after{content:'🏆';position:absolute;right:26px;bottom:16px;font-size:84px;opacity:.13}
.cert-ttl{font-size:12px;letter-spacing:3px;color:#B08A5A;font-weight:700;margin-bottom:6px}
.cert-name{font-size:24px;font-weight:800;color:#4A3A22;margin-bottom:4px}
.cert-sub{font-size:13.5px;color:#8A7355;margin-bottom:16px;line-height:1.7}
.cert-line{height:1px;background:linear-gradient(90deg,#E4CFAE,transparent);margin:14px 0}
.cert-foot{display:flex;justify-content:space-between;align-items:flex-end;position:relative;z-index:1}
.cert-foot .cno{font-size:12px;color:#A08A6A}
.cert-sign{text-align:right}
.cert-sign .sg{font-family:'STKaiti','KaiTi',serif;font-size:22px;color:#4A3A22;font-weight:700;line-height:1}
.cert-sign span{font-size:11.5px;color:#A08A6A;display:block;margin-top:3px}
.cert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px}

/* 题库列表 */
.qbank-item{border:1px solid var(--line);border-radius:var(--r-m);padding:14px 16px;margin-bottom:10px;transition:.14s}
.qbank-item:hover{border-color:var(--brand);background:var(--line-2)}
.qbank-item .qb-t{display:flex;gap:9px;align-items:flex-start;margin-bottom:8px}
.qbank-item .qb-t b{flex:1;font-size:14px;font-weight:600;line-height:1.55}
.qbank-item .qb-o{display:flex;flex-wrap:wrap;gap:8px;font-size:12.5px;color:var(--ink-3);padding-left:22px}
.qbank-item .qb-o span.right{color:var(--green);font-weight:700}

.ex-tab{padding:0 16px;height:32px;border-radius:7px;font-size:13.5px;font-weight:600;color:var(--ink-2);transition:.15s}
.ex-tab.on{background:var(--card);color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.08)}

/* ============ 实操任务 / 作业 ============ */
.task-card{border:1px solid var(--line);border-radius:var(--r-l);padding:18px 20px;margin-bottom:16px;background:var(--card)}
.tk-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.tk-head b{font-size:15.5px;font-weight:700;flex:1}
.tk-desc{font-size:13.5px;color:var(--ink-2);line-height:1.7;margin-bottom:14px}
.task-feedback{background:var(--green-soft);border:1px solid #C9EBD7;border-radius:var(--r-m);padding:13px 16px;margin-bottom:14px}
.tf-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;font-size:13.5px;font-weight:700;color:var(--green)}
.tf-score{font-size:15px;font-weight:800}
.task-feedback p{font-size:13.5px;color:var(--ink-2);line-height:1.7}
.tk-form textarea{min-height:72px}
.tk-imgs{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.tk-img{position:relative;display:inline-block}
.tk-img img{width:120px;height:90px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.tk-img i{position:absolute;top:-7px;right:-7px;width:18px;height:18px;border-radius:50%;background:var(--red);color:#fff;font-style:normal;font-size:12px;line-height:18px;text-align:center;cursor:pointer}
.tk-actions{display:flex;align-items:center;gap:8px;margin-top:12px}
.tk-actions label{cursor:pointer}

.as-item{display:flex;gap:20px;border:1px solid var(--line);border-radius:var(--r-m);padding:16px 18px;margin-bottom:12px;align-items:center;transition:.14s}
.as-item:hover{border-color:var(--brand)}
.as-main{flex:1;min-width:0}
.as-title{font-size:15px;font-weight:700;margin-bottom:5px}
.as-meta{font-size:12px;color:var(--ink-3);margin-bottom:7px}
.as-desc{font-size:13px;color:var(--ink-2);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.as-side{text-align:right;flex-shrink:0}
.as-nums{font-size:12.5px;color:var(--ink-3);margin-bottom:10px}
.as-num{font-size:20px;font-weight:800;color:var(--ink)}
.as-num.warn{color:var(--amber)}
.as-side .ops{display:flex;gap:6px;justify-content:flex-end}
.as-side .ops button{padding:4px 10px;border-radius:5px;font-size:12.5px;font-weight:600;color:var(--brand);background:var(--brand-soft)}
.as-side .ops button.danger{color:var(--red);background:var(--red-soft)}
.c-red{color:var(--red)}.c-green{color:var(--green)}

.modal-loading{text-align:center;color:var(--ink-3);padding:30px 0;font-size:14px}
.sub-item{border:1px solid var(--line);border-radius:var(--r-m);padding:16px;margin-bottom:14px}
.sub-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.sub-head .cell-u{display:flex;align-items:center;gap:9px}
.sub-head .cell-u .avatar{width:30px;height:30px;font-size:12.5px}
.sub-head .cell-u b{display:block;font-size:13.5px;font-weight:600}
.sub-head .cell-u span{font-size:11.5px;color:var(--ink-3)}
.sub-content{font-size:13.5px;color:var(--ink);line-height:1.75;white-space:pre-wrap}
.sub-imgs{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.sub-imgs img{width:140px;height:100px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.sub-review{border-top:1px dashed var(--line);margin-top:12px;padding-top:12px}
.sr-row{display:flex;align-items:center;gap:8px}

/* ============ 学员问答 / 互动讨论区 ============ */
.qa-wrap{display:flex;flex-direction:column;gap:18px}
.qa-ask{background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:16px;display:flex;flex-direction:column;gap:10px}
.qa-ask .inp{width:100%}
.qa-list{display:flex;flex-direction:column;gap:12px}
.qa-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:14px 16px;cursor:pointer;transition:border-color .15s}
.qa-item:hover{border-color:var(--brand)}
.qa-q b{font-size:15px;display:block;margin-bottom:4px}
.qa-meta{font-size:12px;color:var(--ink-3)}
.qa-a{margin-top:12px;border-top:1px dashed var(--line);padding-top:12px}
.qa-reps{display:flex;flex-direction:column;gap:10px}
.qa-rep{background:var(--line-2);border-radius:10px;padding:10px 12px}
.qa-rep.teacher{background:var(--brand-soft);border:1px solid #FFD9B8}
.qa-rep-h{display:flex;align-items:center;gap:8px;font-size:13px;margin-bottom:4px}
.qa-rep-h b{font-size:13px}
.qa-rep-t{color:var(--ink-3);font-size:11.5px}
.badge-teacher{background:var(--brand);color:#fff;font-size:11px;padding:1px 7px;border-radius:99px}
.qa-rep-c{font-size:13.5px;color:var(--ink);line-height:1.7;white-space:pre-wrap}
.qa-norep{color:var(--ink-3);font-size:13px;padding:6px 0}
.qa-reply{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.qa-reply .inp{width:100%}
/* 管理台问答 */
.ask-row{display:flex;align-items:flex-start;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:14px 16px}
.ask-main{flex:1;min-width:0}
.ask-main>b{font-size:15px;display:block;margin-bottom:4px}
.ask-meta{font-size:12px;color:var(--ink-3);margin-bottom:6px}
.ask-content{font-size:13.5px;color:var(--ink-2);line-height:1.7;white-space:pre-wrap}
.ask-dlg h3{font-size:17px;margin-bottom:6px}
.ask-dlg .ask-meta{font-size:12px;color:var(--ink-3);margin-bottom:8px}
.ask-dlg .ask-content{background:var(--line-2);border-radius:10px;padding:10px 12px;font-size:13.5px;line-height:1.7;white-space:pre-wrap;margin-bottom:14px}
.as-filter{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.chip{border:1px solid var(--line);background:var(--card);color:var(--ink-2);border-radius:99px;padding:6px 14px;font-size:13px;cursor:pointer}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}

/* ============ 课程评价 / 学员口碑 ============ */
.rv-summary{display:flex;gap:30px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line-2);flex-wrap:wrap}
.rv-score{text-align:center;min-width:120px}
.rv-avg{font-size:38px;font-weight:800;line-height:1;color:var(--ink)}
.rv-stars{font-size:16px;letter-spacing:2px;margin:6px 0 4px}
.rv-stars .c-green{color:var(--green)}.rv-stars .c-amber{color:var(--amber)}.rv-stars .c-red{color:var(--red)}
.rv-meta{font-size:12px;color:var(--ink-3)}
.rv-dist{flex:1;min-width:220px;display:flex;flex-direction:column;gap:6px}
.rv-bar{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--ink-3)}
.rv-bar-k{width:26px;flex-shrink:0}
.rv-bar-track{flex:1;height:8px;background:var(--line-2);border-radius:99px;overflow:hidden}
.rv-bar-track b{display:block;height:100%;background:var(--amber);border-radius:99px}
.rv-bar-n{width:26px;text-align:right;flex-shrink:0}
.rv-form{background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:16px;margin:16px 0}
.rv-form-title{font-size:14px;font-weight:700;margin-bottom:10px}
.rv-rate{display:flex;align-items:center;gap:6px;margin-bottom:10px}
.rv-star{font-size:26px;color:var(--line);cursor:pointer;transition:color .12s,transform .12s;line-height:1}
.rv-star.on{color:var(--amber)}
.rv-star.dim{color:var(--line)}
.rv-star:hover{transform:scale(1.12)}
.rv-rate-hint{font-size:12.5px;color:var(--ink-3);margin-left:6px}
.rv-form .inp{width:100%;min-height:80px;margin-bottom:10px}
.rv-locked{display:flex;align-items:center;gap:8px;justify-content:center;background:var(--line-2);color:var(--ink-3);font-size:13px;border-radius:var(--r-m);padding:14px;margin:16px 0}
.rv-list{display:flex;flex-direction:column;gap:0}
.rv-item{position:relative;padding:14px 0;border-bottom:1px solid var(--line-2)}
.rv-item.featured{background:linear-gradient(180deg,var(--brand-soft),transparent);border-radius:10px;padding:14px;margin:4px 0}
.rv-feat{position:absolute;top:14px;right:0;background:var(--brand);color:#fff;font-size:11px;padding:2px 9px;border-radius:99px}
.rv-item-h{display:flex;align-items:center;gap:9px;margin-bottom:6px}
.rv-item-h b{font-size:13.5px}
.rv-item-stars{font-size:13px;letter-spacing:1px}
.rv-item-t{font-size:12px;color:var(--ink-3);margin-left:auto}
.rv-item-c{font-size:13.5px;color:var(--ink-2);line-height:1.7;white-space:pre-wrap}
.rv-rep{background:var(--line-2);border-radius:10px;padding:10px 12px;margin-top:10px}
.rv-rep-badge{display:inline-block;background:var(--brand);color:#fff;font-size:11px;padding:1px 8px;border-radius:99px;margin-right:6px}
.rv-rep-c{font-size:13px;color:var(--ink);line-height:1.7;white-space:pre-wrap;display:inline}
.rv-rep-t{display:block;font-size:11.5px;color:var(--ink-3);margin-top:5px}
/* 管理台评价 */
.rev-row{display:flex;align-items:flex-start;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);padding:14px 16px;margin-bottom:12px}
.rev-main{flex:1;min-width:0}
.rev-h{display:flex;align-items:center;gap:9px;font-size:13.5px;font-weight:600;margin-bottom:6px;flex-wrap:wrap}
.rev-stars{font-size:13px;letter-spacing:1px}
.rev-course{font-size:12px;color:var(--ink-3);font-weight:400;margin-left:auto}
.rev-c{font-size:13.5px;color:var(--ink-2);line-height:1.7;white-space:pre-wrap;margin-bottom:6px}
.rev-t{font-size:11.5px;color:var(--ink-3)}
.rev-ops{display:flex;flex-direction:column;gap:6px;flex-shrink:0}
.rev-ops button{padding:4px 12px;border-radius:5px;font-size:12.5px;font-weight:600;color:var(--brand);background:var(--brand-soft);white-space:nowrap}
.rev-ops button.btn-danger{color:var(--red);background:var(--red-soft)}
.c-amber{color:var(--amber)}

/* ============ 加载骨架屏 ============ */
.skel-line,.skel-card{border-radius:10px;background:linear-gradient(90deg,var(--line-2) 25%,#eef1f6 37%,var(--line-2) 63%);background-size:400% 100%;animation:skel 1.15s ease infinite}
.skel-line{height:18px;margin-bottom:14px}
.skel-card{height:140px}
.skel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
@keyframes skel{0%{background-position:100% 0}100%{background-position:0 0}}

/* ============ 管理台移动端抽屉侧栏 ============ */
.admin-burger{display:none;border:none;background:none;font-size:20px;line-height:1;color:var(--ink-2);padding:4px 10px 4px 0;margin-left:-10px;cursor:pointer}
.admin-mask{display:none}

@media (max-width:860px){
  /* 侧栏改为抽屉 */
  .admin-burger{display:inline-flex}
  .admin-topbar .wrap{display:flex;align-items:center;gap:8px}
  .admin-side{width:246px;transform:translateX(-100%);transition:transform .22s ease}
  body.side-open .admin-side{transform:none;box-shadow:12px 0 40px rgba(0,0,0,.35)}
  .admin-body{margin-left:0}
  .admin-mask{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:49}
  body.side-open .admin-mask{display:block}

  /* 表格：横向滚动，不再把列压扁 */
  .panel-body{overflow-x:auto}
  .table{min-width:760px}
  .table td{vertical-align:middle}

  /* 课程树行：标题独占一行，meta 与操作按钮各占一行 */
  .cnode-h{flex-wrap:wrap;row-gap:9px;padding:14px 12px}
  .cnode-h b{flex:1 1 100%;order:3;font-size:14px;line-height:1.5}
  .cnode-h .ci{width:34px;height:34px;font-size:16px}
  .cnode-h .caret{order:0}
  .cnode-h .ci{order:1}
  .cnode-h .cm{order:4;width:100%;padding-left:46px;gap:10px;flex-wrap:wrap}
  .cnode-h .ops{order:5;margin-left:46px!important}
  .sec-row{flex-wrap:wrap;row-gap:7px;padding:10px 12px 10px 30px}
  .sec-row .st{flex:1 1 100%;order:3;line-height:1.5}
  .sec-row .sn{order:0}
  .sec-row .sd{order:4;margin-left:18px}
  .sec-row .ops{order:5;margin-left:auto!important}

  /* 顶部工具栏在窄屏收紧 */
  .tbar{padding:12px 12px}
}

/* 演示播放器小屏：标题与控制条重叠，隐藏标题（正文里已有完整标题） */
@media (max-width:600px){
  .player-bg .pt{display:none}
  .player-bg .ps{display:none}
  .player{min-height:200px}
}