/* ============ 化书为课 网页版播放器 ============ */
:root{
  --navy:#142A3A;
  --navy2:#1A5276;
  --gold:#C8A24A;
  --ink:#333333;
  --gray:#8A8F98;
  --line:#D8DEE4;
  --cream:#FBF7EF;
  --font:"Microsoft YaHei","PingFang SC","Source Han Sans SC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased;}
html,body{height:100%;}
body{font-family:var(--font);background:#0E1D29;color:#fff;overflow:hidden;display:flex;flex-direction:column;}

/* ---------- 顶部栏 ---------- */
#topbar{flex:0 0 auto;display:flex;align-items:center;gap:18px;height:60px;padding:0 22px;background:var(--navy);border-bottom:1px solid rgba(200,162,74,.35);}
#topbar a.back{color:var(--gold);text-decoration:none;font-size:15px;font-weight:700;letter-spacing:1px;white-space:nowrap;}
#topbar a.back:hover{opacity:.8;}
#title{font-size:17px;font-weight:800;letter-spacing:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
#progText{margin-left:auto;font-size:14px;color:#AFC3D2;white-space:nowrap;}
.ctl{flex:0 0 auto;display:flex;align-items:center;gap:8px;}
.ctl button{
  min-width:38px;height:34px;padding:0 14px;border:1px solid rgba(200,162,74,.55);background:rgba(200,162,74,.12);
  color:var(--gold);font-size:14px;font-weight:700;border-radius:9px;cursor:pointer;font-family:var(--font);letter-spacing:1px;
}
.ctl button:hover{background:rgba(200,162,74,.28);}
.ctl button:disabled{opacity:.35;cursor:not-allowed;}
.ctl button.primary{background:var(--gold);color:var(--navy);border-color:var(--gold);}

/* ---------- 进度条 ---------- */
#progressTrack{flex:0 0 auto;height:5px;background:rgba(255,255,255,.12);}
#progressFill{height:100%;width:0%;background:linear-gradient(90deg,var(--gold),#E6C87C);transition:width .35s ease;}

/* ---------- 舞台区 ---------- */
#stageWrap{flex:1 1 auto;position:relative;overflow:hidden;background:#0E1D29;}
#stageBox{position:absolute;left:50%;top:50%;width:1920px;height:1080px;margin-left:-960px;margin-top:-540px;transform-origin:center center;transform:scale(1);box-shadow:0 18px 60px rgba(0,0,0,.5);}
#stage{width:100%;height:100%;border:0;background:#fff;}

/* ---------- 覆盖层 ---------- */
.overlay{position:absolute;inset:0;z-index:10;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;background:rgba(14,29,41,.92);backdrop-filter:blur(4px);}
.overlay.hidden{display:none;}
.ov-kicker{font-size:15px;letter-spacing:8px;color:#AFC3D2;}
.ov-title{font-size:46px;font-weight:900;letter-spacing:4px;color:#fff;text-align:center;}
.ov-title .g{color:var(--gold);}
.ov-desc{font-size:19px;color:#AFC3D2;letter-spacing:2px;}
.ov-btn{
  margin-top:10px;padding:16px 58px;font-size:24px;font-weight:800;letter-spacing:4px;color:var(--navy);
  background:var(--gold);border:0;border-radius:999px;cursor:pointer;font-family:var(--font);
  box-shadow:0 14px 34px rgba(200,162,74,.45);transition:transform .15s ease, box-shadow .15s ease;
}
.ov-btn:hover{transform:translateY(-2px);box-shadow:0 18px 42px rgba(200,162,74,.6);}
.ov-note{font-size:14px;color:#7B93A4;}
.ov-end-sub{font-size:20px;color:#AFC3D2;letter-spacing:2px;}
.ov-btn.ghost{background:rgba(255,255,255,.1);color:#CFE3F2;box-shadow:none;border:1px solid rgba(175,195,210,.4);}
.ov-btn.ghost:hover{background:rgba(255,255,255,.18);box-shadow:none;}

/* ---------- 作业窗口 ---------- */
#hwOverlay{background:rgba(10,20,30,.96);gap:20px;}
#hwOverlay .ov-title{font-size:26px;letter-spacing:2px;}
#hwBox{width:min(640px,90vw);background:#10283A;border:1px solid rgba(200,162,74,.4);border-radius:18px;padding:24px 26px;box-shadow:0 24px 60px rgba(0,0,0,.5);}
.hw-req{background:rgba(200,162,74,.08);border:1px dashed rgba(200,162,74,.45);border-radius:12px;padding:12px 14px;margin-bottom:14px;font-size:13.5px;line-height:1.8;color:#C9DBE8;white-space:pre-line;}
.hw-req-t{font-weight:800;color:var(--gold);margin-bottom:4px;letter-spacing:1px;}
#hwStatus{margin-bottom:14px;font-size:14.5px;color:#AFC3D2;line-height:1.8;}
#hwStatus .tag{display:inline-block;padding:3px 12px;border-radius:999px;font-size:13px;font-weight:700;}
#hwStatus .tag.pending{background:rgba(200,162,74,.2);color:var(--gold);}
#hwStatus .tag.pass{background:rgba(62,124,79,.28);color:#7ED99A;}
#hwStatus .tag.excellent{background:rgba(200,162,74,.28);color:var(--gold);}
#hwStatus .tag.fail{background:rgba(176,58,46,.32);color:#F08A7C;}
#hwStatus .fb{background:rgba(255,255,255,.06);border-radius:10px;padding:10px 12px;margin-top:8px;font-size:13.5px;color:#D5E2EC;}
#hwStatus .att{margin-top:10px;}
#hwStatus .att button{background:rgba(26,82,118,.55);border:1px solid rgba(175,195,210,.4);color:#CFE3F2;padding:8px 16px;border-radius:9px;font-size:13px;font-weight:700;cursor:pointer;font-family:var(--font);}
#hwStatus .att button:hover{background:rgba(26,82,118,.8);}
#hwForm textarea{width:100%;min-height:120px;background:#0C2030;border:1px solid rgba(175,195,210,.35);border-radius:12px;color:#fff;padding:13px 14px;font-family:var(--font);font-size:15px;resize:vertical;}
#hwForm textarea:focus{outline:none;border-color:var(--gold);}
.hw-file-row{display:flex;align-items:center;gap:10px;margin-top:12px;flex-wrap:wrap;}
.hw-file-row input[type=file]{color:#AFC3D2;font-size:13px;}
.hw-file-hint{color:#7B93A4;font-size:12.5px;}
.hw-btns{display:flex;gap:12px;margin-top:18px;justify-content:center;}
.hw-btns .ov-btn{padding:12px 34px;font-size:17px;letter-spacing:2px;margin-top:0;}
#hwMsg{text-align:center;font-size:13px;color:#F0C96A;margin-top:10px;min-height:18px;}

/* ---------- 手机端适配 ---------- */
@media (max-width: 768px){
  #topbar{height:auto;min-height:48px;padding:8px 12px;gap:8px;flex-wrap:wrap;align-content:center;}
  #topbar a.back{font-size:13px;}
  #title{font-size:13px;max-width:35%;}
  #progText{font-size:12px;margin-left:0;}
  .ctl{gap:5px;flex-wrap:wrap;}
  .ctl button{min-width:30px;height:30px;padding:0 8px;font-size:12px;border-radius:7px;letter-spacing:0;}
  .ov-kicker{font-size:12px;letter-spacing:5px;}
  .ov-title{font-size:26px;letter-spacing:2px;}
  .ov-desc{font-size:14px;letter-spacing:1px;text-align:center;padding:0 20px;}
  .ov-btn{padding:12px 36px;font-size:17px;letter-spacing:2px;}
  .ov-note{font-size:12px;text-align:center;padding:0 20px;}
  .ov-end-sub{font-size:15px;text-align:center;padding:0 20px;}
  #hwOverlay .ov-title{font-size:19px;}
  #hwBox{padding:18px 16px;}
  #hwForm textarea{min-height:96px;font-size:14px;}
  .hw-btns .ov-btn{padding:10px 24px;font-size:15px;}
}
@media (max-width: 480px){
  #title{display:none;}
  #progText{font-size:11px;order:1;width:100%;text-align:center;}
  .ctl{order:2;}
  .ov-title{font-size:22px;}
  .ov-desc{font-size:13px;}
}