:root{
  --blue:#086e8c;--blue-dark:#0b607b;--blue-light:#e9f3f6;
  --ink:#173947;--muted:#617887;--line:#dce7ed;--bg:#f2f6f9;
  --ok:#1a7f5a;--warn:#b26a00;--danger:#c0392b;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font:16px/1.6 'Microsoft YaHei','PingFang SC','Source Han Sans SC',sans-serif;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:0;border-radius:9px;padding:12px 22px;background:var(--blue);color:#fff;font-weight:600;transition:filter .15s,opacity .15s}
button:hover:not(:disabled){filter:brightness(1.07)}
button:disabled{cursor:not-allowed;opacity:.45}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid #99cbd7;outline-offset:2px}
.secondary{background:#eaf2f6;color:var(--ink)}
.plain{background:transparent;color:var(--muted);padding:8px 10px}
.danger{background:transparent;color:var(--danger);padding:8px 10px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.spread{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}
.small{font-size:13px}
.muted{color:var(--muted)}
.error{color:var(--danger);font-size:14px;min-height:20px;margin-top:8px}

/* ---------- header ---------- */
header{
  height:78px;background:#fff;border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 5%;gap:15px;position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:center;gap:12px;font-size:21px;font-weight:700}
.mark{background:var(--blue);color:#fff;font-size:29px;width:42px;height:42px;border-radius:12px;text-align:center;line-height:42px;flex:none}
.badge{font-size:13px;background:var(--blue-light);color:var(--blue);border-radius:5px;padding:3px 9px;font-weight:600}
#account{font-size:15px;color:var(--muted);display:flex;align-items:center;gap:8px}
#account b{color:var(--ink)}

main{max-width:1100px;margin:36px auto;padding:0 24px;min-height:60vh}
footer{max-width:1100px;margin:0 auto;padding:14px 24px 40px;color:var(--muted);font-size:13px}

h1{font-size:29px;line-height:1.3;margin:0 0 10px}
h2{font-size:21px;margin:0 0 20px}
h3{font-size:17px;margin:0 0 10px}
p{margin:8px 0 20px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;margin-bottom:20px}

/* ---------- login ---------- */
.login{display:grid;grid-template-columns:1fr 1fr;min-height:510px;margin-top:65px;overflow:hidden;padding:0}
.intro{padding:60px 42px;color:#fff;background:var(--blue-dark);display:flex;flex-direction:column;justify-content:center}
.intro .small{letter-spacing:.14em;color:#a8d8e4}
.intro h1{font-size:36px}
.intro p{color:#c1e3ec}
.intro .flow{margin-top:30px;border-top:1px solid #ffffff30;padding-top:22px;line-height:2.5;font-size:15px}
.intro .flow b{display:inline-block;width:34px;color:#8fd0e0;font-weight:700}
.loginform{padding:45px}
.label{display:block;font-weight:600;margin-bottom:8px}
input[type=text],input[type=password],input[type=number],select,textarea{
  width:100%;padding:12px 14px;border:1px solid #cad9e0;background:#fff;
  border-radius:8px;margin-bottom:20px;color:var(--ink);
}
/* 只有一个选项时用只读字段代替下拉框 */
.fixed-field{
  padding:12px 14px;border:1px solid #dbe6ec;background:#f4f8fa;
  border-radius:8px;margin-bottom:20px;color:var(--ink);font-weight:600;
}
.check{display:flex;gap:10px;align-items:flex-start;padding:14px 16px;background:#f7fafc;border:1px solid var(--line);border-radius:10px;margin-bottom:20px}
.check input{width:18px;height:18px;margin:3px 0 0;flex:none;accent-color:var(--blue)}
.check span{font-size:15px;flex:1;min-width:0}

/* ---------- tabs ---------- */
.tabs{display:flex;border-bottom:1px solid var(--line);gap:30px;margin:25px 0}
.tabs button{border-radius:0;padding:14px 0;background:none;color:var(--muted);font-weight:600;border-bottom:3px solid transparent;margin-bottom:-1px}
.tabs button.active{color:var(--blue);border-bottom-color:var(--blue)}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:24px}
.stat{background:#f7fafc;border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.stat b{display:block;font-size:26px;line-height:1.3;color:var(--blue)}
.stat span{font-size:13px;color:var(--muted)}

/* ---------- records ---------- */
.rec{border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:12px;background:#fff}
.rec.pending{border-left:4px solid var(--warn)}
.rec.done{border-left:4px solid var(--ok)}
.rec .nm{font-size:17px;font-weight:700}
.rec .meta{font-size:14px;color:var(--muted);margin-top:4px}
.tag{display:inline-block;font-size:12px;padding:2px 8px;border-radius:4px;font-weight:600}
.tag.done{background:#e6f4ee;color:var(--ok)}
.tag.pending{background:#fdf2e2;color:var(--warn)}
.rec .sig{margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap}
.rec .sig img{height:64px;background:#fbfdfe;border:1px solid var(--line);border-radius:6px}
.empty{text-align:center;color:var(--muted);padding:46px 20px;border:1px dashed var(--line);border-radius:12px}

/* ---------- steps ---------- */
.steps{display:flex;gap:10px;margin-bottom:22px;flex-wrap:wrap}
.step{flex:1;min-width:150px;padding:12px 14px;border-radius:10px;background:#f7fafc;border:1px solid var(--line);font-size:14px;color:var(--muted)}
.step.on{background:var(--blue-light);border-color:#b6dbe4;color:var(--blue);font-weight:600}
.step.done{color:var(--ok)}
.step i{font-style:normal;font-weight:700;margin-right:8px}

/* ---------- player ---------- */
.stage{background:#0e2b38;border-radius:12px;overflow:hidden}
.screen{position:relative;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;padding:24px;cursor:pointer;background:radial-gradient(120% 120% at 50% 40%,#174556 0%,#0e2b38 70%);user-select:none}
.screen:active{background:radial-gradient(120% 120% at 50% 40%,#1d5266 0%,#0e2b38 70%)}
.screen-in{max-width:560px}
.screen-in .chip{display:inline-block;font-size:12px;background:#ffffff1f;border-radius:4px;padding:3px 9px;margin-bottom:14px;letter-spacing:.06em}
.screen-in h3{font-size:22px;margin:0 0 10px}
.screen-in p{color:#a9c6d1;font-size:14px;margin:0}
.progress{height:6px;background:#ffffff1f}
.progress i{display:block;height:100%;background:#39b3d6;width:0;transition:width .25s linear}
.player{padding:16px 18px;color:#cfe3ea;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}
.player .time{font-variant-numeric:tabular-nums;font-size:17px;color:#fff}
.player button{background:#ffffff1a;color:#fff;padding:9px 16px}
.player button:hover:not(:disabled){background:#ffffff2b}
.player button.on{background:#39b3d6;color:#06222e}
.warnline{padding:12px 18px;background:#fdf2e2;color:var(--warn);font-size:14px;border-top:1px solid #ffffff1a}

/* ---------- dialog ---------- */
dialog{border:0;border-radius:16px;padding:0;max-width:560px;width:calc(100% - 32px);box-shadow:0 24px 60px #0b2b3a4d}
dialog::backdrop{background:#0b2b3a99}
.dlg{padding:30px}
.note{background:#f7fafc;border:1px solid var(--line);border-radius:10px;padding:14px 16px;line-height:1.9}
canvas#pad{width:100%;height:180px;border:1px dashed #b8cdd6;border-radius:10px;background:#fbfdfe;touch-action:none;display:block;cursor:crosshair}
.actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap;margin-top:22px}
.success{text-align:center;padding:46px 30px}
.checkmark{width:66px;height:66px;border-radius:50%;background:#e6f4ee;color:var(--ok);font-size:34px;display:flex;align-items:center;justify-content:center;margin:0 auto 18px}

@media(max-width:760px){
  .login{grid-template-columns:1fr}
  .intro{padding:38px 28px}
  .intro h1{font-size:29px}
  .loginform{padding:30px 24px}
  main{padding:0 16px;margin-top:24px}
  .card{padding:22px}
  header{height:auto;padding:12px 16px}
}

/* ---------- 播放列表 ---------- */
.playlist{display:flex;flex-direction:column;gap:10px}
.pl-item{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:12px;padding:14px 16px;cursor:pointer;background:#fff;transition:border-color .15s,background .15s}
.pl-item:hover{border-color:#9fc7d8;background:#f7fbfd}
.pl-item.on{border-color:var(--blue);background:#eef6f9;box-shadow:inset 3px 0 0 var(--blue)}
.pl-item.done{background:#f6faf8}
.pl-num{width:30px;height:30px;flex:0 0 30px;border-radius:50%;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--muted);background:#fff}
.pl-item.on .pl-num{border-color:var(--blue);color:var(--blue);font-weight:600}
.pl-item.done .pl-num{background:#e6f4ee;border-color:#bfe3d4;color:var(--ok);font-weight:600}
.pl-main{flex:1;min-width:0}
.pl-title{font-size:15px;font-weight:600;line-height:1.4}
.pl-sub{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.5}
.pl-state{font-size:12px;color:var(--muted);white-space:nowrap}
.pl-item.on .pl-state{color:var(--blue);font-weight:600}
.pl-item.done .pl-state{color:var(--ok)}
@media(max-width:760px){
  .pl-item{flex-wrap:wrap}
  .pl-main{flex:1 1 100%;order:2}
  .pl-state{order:3;margin-left:auto}
}

/* ---------- 观看页双栏 ---------- */
.watch-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 24px;margin-bottom:14px}
.watch-grid{display:grid;grid-template-columns:300px minmax(0,1fr);gap:14px;align-items:stretch}
.watch-list{position:sticky;top:16px;align-self:stretch;display:flex;flex-direction:column}
.watch-main{min-width:0;display:flex;flex-direction:column}
.watch-list .wl-note{margin-top:auto}
.wl-head{font-size:14px;margin:0 0 12px}
.wl-progress{height:5px;border-radius:3px;background:#e6eef2;overflow:hidden}
.wl-progress>i{display:block;height:100%;width:0;background:var(--blue);border-radius:3px;transition:width .25s}
.wl-count{font-size:12.5px;color:var(--muted);margin:8px 0 14px}

@media(max-width:980px){
  .watch-grid{grid-template-columns:1fr}
  .watch-list{position:static;order:2}
  .watch-main{order:1}
}

/* 未上线视频 */
.pl-item.locked{background:#f7f9fa;border-style:dashed;cursor:not-allowed;opacity:.72}
.pl-item.locked:hover{border-color:var(--line);background:#f7f9fa}
.pl-item.locked .pl-title{color:var(--muted);font-weight:500}
.pl-item.locked .pl-sub{color:#93a6b2}
.pl-item.locked .pl-num{background:#eef2f4;border-color:#dde5e9;color:#93a6b2;font-size:15px;line-height:1}

/* ---------- 看完后弹窗：下一条选择 + 签名 ---------- */
.next-list{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.next-item{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer;background:#fff;transition:border-color .15s,background .15s}
.next-item:hover{border-color:#9fc7d8;background:#f7fbfd}
.next-item:has(input:checked){border-color:var(--blue);background:#eef6f9}
.next-item input{margin-top:4px;accent-color:var(--blue);width:16px;height:16px;flex:0 0 16px}
.next-item span{display:flex;flex-direction:column;gap:3px;min-width:0}
.next-item b{font-size:14px;font-weight:600;line-height:1.4}
.next-item i{font-style:normal;font-size:12.5px;color:var(--muted);line-height:1.5}
.dlg-sep{border:0;border-top:1px solid var(--line);margin:22px 0 14px}
#signArea.collapsed{display:none}
#signArea{margin-top:18px}
dialog{max-height:88vh}
dialog .dlg{max-height:88vh;overflow:auto}
.wl-mini{font-size:12px;font-weight:400;color:var(--muted);margin-left:6px}
/* 两栏等高：右栏播放器区撑满，底部提示贴底 */
.watch-main .stage{flex:1 1 auto;display:flex;flex-direction:column}
.watch-main .screen{flex:0 0 auto;aspect-ratio:16/9;width:100%}
.watch-main .stage-tail{margin-top:auto}
@media(max-width:980px){
  .watch-list,.watch-main{align-self:auto}
}

/* ---------- 真实视频播放器 ---------- */
.player-video{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#0e2b38;display:block}
.player-video[hidden]{display:none}
.screen:has(.player-video:not([hidden])){cursor:default}
.screen-in[hidden]{display:none}