/* ============================================================
   多乐课堂 · Kimi 视觉候选设计系统（第二轮 Apple 精修）
   作用域：body.classroom-page（用户端课堂）
           课程后台样式由 style.css 末尾的 .course-admin-page 作用域段承担
   约定：所有课堂自有类以 cr- 开头；不改写财务工具全局规则。
   第二轮方向：中性灰底、单一蓝紫品牌色、状态色克制、深浅一致。
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
.classroom-page{
  --cr-bg:var(--paper);
  --cr-surface:var(--surface);
  --cr-surface-2:var(--surface2);
  --cr-ink:var(--ink);
  --cr-ink-2:var(--ink2);
  --cr-ink-3:#626a78;
  --cr-line:var(--line);
  --cr-line-soft:var(--line2);
  --cr-accent:var(--brand);
  --cr-accent-strong:var(--brand-d);
  --cr-accent-soft:var(--brand-soft);
  --cr-on-accent:var(--on-brand);
  --cr-member:var(--ink);
  --cr-member-ink:var(--surface);
  --cr-amber:#9a4300;
  --cr-amber-soft:var(--warn-bg);
  --cr-green:var(--loss);
  --cr-green-soft:var(--loss-bg);
  --cr-red:var(--error);
  --cr-red-soft:var(--bad-bg);
  --cr-player:#17171a;
  --cr-shadow:var(--shadow);
  --cr-shadow-hover:var(--shadow);
  --cr-radius:14px;
  --cr-radius-lg:20px;
  --cr-bar:var(--surface2);
}

@media (prefers-color-scheme:dark){
  .classroom-page{
    --cr-ink-3:#a8aeba;
    --cr-amber:#f0b35c;
  }
}

/* ---------- 2. 页面基底：压掉全局渐变光斑 ---------- */
body.classroom-page{
  background:var(--cr-bg);
  color:var(--cr-ink);
}
.classroom-wrap a{color:var(--cr-accent-strong)}
.classroom-wrap a.cr-btn-primary{color:var(--cr-on-accent)}
.classroom-wrap a.cr-btn-secondary{color:var(--cr-ink)}
.classroom-wrap a.cr-btn-ghost{color:var(--cr-accent-strong)}

/* 本地 SVG 图标：统一 13px、当前色 */
.cr-ic{width:13px;height:13px;flex:none;vertical-align:-2px}
.cr-ic-lg{width:34px;height:34px}

/* ---------- 3. 顶栏与手机底栏 ---------- */
.classroom-page .classroom-topbar{
  background:var(--cr-bar);
  border-bottom:1px solid var(--cr-line-soft);
  -webkit-backdrop-filter:saturate(160%) blur(18px);
  backdrop-filter:saturate(160%) blur(18px);
}
.classroom-page .classroom-brand{color:var(--cr-ink)}
.classroom-page .classroom-brand>span{
  background:var(--cr-accent);color:var(--cr-on-accent);border-radius:10px;
  width:34px;height:34px;font-size:18px;font-weight:700;
}
.classroom-page .classroom-brand strong{font-size:17px;letter-spacing:-.2px}
.classroom-page .classroom-topbar nav a{color:var(--cr-ink-2);padding:8px 13px;font-size:14px;border-radius:999px;
  transition:background-color .15s ease,color .15s ease}
.classroom-page .classroom-topbar nav a.active{background:var(--cr-accent-soft);color:var(--cr-accent-strong);font-weight:650}
.classroom-page .classroom-topbar .internal-identity-badge{margin-left:auto}
.classroom-page .classroom-wrap{max-width:1080px}
.classroom-page .classroom-tabbar{
  background:var(--bar);border:0;border-top:1px solid var(--hairline);
  -webkit-backdrop-filter:saturate(180%) blur(22px);backdrop-filter:saturate(180%) blur(22px);
}
.classroom-page .classroom-tabbar a{color:var(--sub)}
.classroom-page .classroom-tabbar a.active{background:transparent;color:var(--brand)}

/* ---------- 4. 按钮三级体系 ---------- */
.classroom-page .cr-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:44px;padding:11px 20px;border-radius:12px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1.2;cursor:pointer;text-decoration:none;
  transition:transform .12s ease,background-color .15s ease,border-color .15s ease,box-shadow .15s ease;
}
.classroom-page .cr-btn:active{transform:scale(.97)}
.classroom-page .cr-btn:focus-visible{outline:3px solid var(--cr-accent);outline-offset:2px}
.cr-btn-primary{background:var(--cr-accent);color:var(--cr-on-accent)}
.cr-btn-secondary{background:var(--cr-surface);border-color:var(--cr-line);color:var(--cr-ink)}
.cr-btn-ghost{background:transparent;color:var(--cr-accent-strong);padding:11px 8px}
.cr-btn-danger{background:transparent;border-color:var(--cr-red);color:var(--cr-red)}
.cr-btn[disabled]{opacity:.55;cursor:not-allowed}
.cr-btn-sm{min-height:38px;padding:8px 14px;font-size:14px;border-radius:10px}

/* ---------- 5. 徽章与状态（形状+文字+颜色共同表达） ---------- */
.cr-badge{
  display:inline-flex;align-items:center;gap:5px;
  padding:4px 10px;border-radius:999px;font-size:12px;font-weight:650;line-height:1.4;
  background:var(--cr-surface-2);color:var(--cr-ink-2);
}
.cr-badge .cr-ic{width:11px;height:11px}
.cr-badge-preview{background:var(--cr-green-soft);color:var(--cr-green)}
.cr-badge-member{background:var(--cr-member);color:var(--cr-member-ink)}
.cr-badge-standalone{background:var(--cr-accent-soft);color:var(--cr-accent-strong)}
.cr-badge-pending{background:var(--cr-surface-2);color:var(--cr-ink-3)}
.cr-badge-locked{background:var(--cr-amber-soft);color:var(--cr-amber)}
.cr-badge-done{background:var(--cr-green-soft);color:var(--cr-green)}
.cr-badge-dot::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}

/* ---------- 6. 首页 ---------- */
.cr-intro{padding:44px 0 8px}
.cr-intro-kicker{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--cr-accent-strong);text-transform:uppercase}
.cr-intro h1{
  margin:10px 0 0;font-size:clamp(26px,3.6vw,36px);line-height:1.22;letter-spacing:-.025em;color:var(--cr-ink);
  max-width:620px;font-weight:750;text-wrap:balance;
}
.cr-intro p{margin:12px 0 0;max-width:560px;font-size:16px;color:var(--cr-ink-2);line-height:1.65}
.cr-intro-points{display:flex;flex-wrap:wrap;gap:8px 18px;margin:18px 0 0;padding:0;list-style:none}
.cr-intro-points li{display:flex;align-items:center;gap:7px;font-size:13.5px;color:var(--cr-ink-2)}
.cr-intro-points li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--cr-accent)}

.cr-searchbar{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px;
  margin:26px 0 0;padding:6px 6px 6px 16px;max-width:640px;
  background:var(--cr-surface);border:1px solid var(--cr-line);border-radius:14px;box-shadow:var(--cr-shadow);
}
.cr-searchbar:focus-within{border-color:var(--cr-accent);box-shadow:0 0 0 3px var(--cr-accent-soft)}
.cr-searchbar input{
  min-width:0;border:0;background:transparent;font-size:15px;color:var(--cr-ink);padding:10px 0;
}
.cr-searchbar input:focus{outline:3px solid var(--cr-accent);outline-offset:2px}
.cr-searchbar input::placeholder{color:var(--cr-ink-3)}
.cr-searchbar .cr-btn{border-radius:10px}

.cr-cats{display:flex;gap:8px;overflow-x:auto;padding:22px 0 16px;scrollbar-width:none}
.cr-cats::-webkit-scrollbar{display:none}
.cr-cats a{
  flex:none;padding:8px 15px;border-radius:999px;border:1px solid var(--cr-line);
  background:var(--cr-surface);color:var(--cr-ink-2);font-size:14px;text-decoration:none;
  transition:background-color .15s ease,color .15s ease,border-color .15s ease;
}
.cr-cats a.active{background:var(--cr-ink);border-color:var(--cr-ink);color:var(--cr-bg);font-weight:600}

.cr-section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin:14px 0 14px}
.cr-section-head h2{margin:0;font-size:20px;letter-spacing:-.015em;color:var(--cr-ink)}
.cr-section-head span{font-size:13px;color:var(--cr-ink-2);font-variant-numeric:tabular-nums}

/* 课程卡片 */
.cr-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;padding-bottom:40px}
.cr-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--cr-surface);border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);
  box-shadow:var(--cr-shadow);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
/* 封面：同一蓝灰协调色板，色相仅由课程 id 在 218–261 间取值 */
.cr-cover{
  position:relative;display:flex;flex-direction:column;justify-content:space-between;
  min-height:148px;padding:14px 16px;text-decoration:none;overflow:hidden;
  background:
    linear-gradient(150deg,hsl(var(--cover-h,225) 30% 91% / 1),hsl(var(--cover-h,225) 34% 83% / 1));
  border-bottom:1px solid var(--cr-line-soft);
}
.cr-cover::after{
  content:attr(data-mark);
  position:absolute;right:6px;bottom:-30px;
  font-size:118px;font-weight:800;line-height:1;font-style:normal;
  color:hsl(var(--cover-h,225) 30% 40% / .12);
  pointer-events:none;user-select:none;
}
.cr-cover-image{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transition:transform .18s ease;
}
.cr-cover.has-image::before{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(15,18,34,.38),rgba(15,18,34,.08) 50%,rgba(15,18,34,.5));
}
.cr-cover.has-image::after{display:none}
.cr-cover-top{position:relative;z-index:2;display:flex;justify-content:space-between;align-items:flex-start;gap:8px}
.cr-cover-cat{
  padding:4px 10px;border-radius:999px;font-size:12px;font-weight:600;
  background:rgba(255,255,255,.75);color:#34343a;
}
.cr-cover-src{font-size:12px;color:hsl(var(--cover-h,225) 26% 34% / 1);font-weight:600}
.cr-cover-bottom{display:flex;align-items:flex-end;justify-content:space-between;gap:8px;position:relative;z-index:2}
.cr-cover.has-image .cr-cover-src,.cr-cover.has-image .cr-cover-serial{color:#fff;text-shadow:0 1px 6px rgba(0,0,0,.45)}
.cr-cover-serial{font-size:12.5px;font-weight:650;color:hsl(var(--cover-h,225) 28% 30% / 1);font-variant-numeric:tabular-nums}
@media (prefers-color-scheme: dark){
  .cr-cover{
    background:linear-gradient(150deg,hsl(var(--cover-h,225) 20% 22% / 1),hsl(var(--cover-h,225) 24% 16% / 1));
  }
  .cr-cover::after{color:hsl(var(--cover-h,225) 30% 70% / .13)}
  .cr-cover-cat{background:rgba(10,10,12,.45);color:#e6e6ea}
  .cr-cover-src{color:hsl(var(--cover-h,225) 24% 70% / 1)}
  .cr-cover-serial{color:hsl(var(--cover-h,225) 26% 72% / 1)}
}
.cr-card-body{display:flex;flex-direction:column;flex:1;padding:16px 18px 18px}
.cr-card-body h3{
  margin:0;font-size:17.5px;line-height:1.35;letter-spacing:-.015em;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.cr-card-body h3 a{color:var(--cr-ink);text-decoration:none}
.cr-card-problem{
  margin:8px 0 0;font-size:13.5px;line-height:1.55;color:var(--cr-ink-2);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  white-space:pre-line;overflow-wrap:anywhere;
}
.cr-card-meta{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:12px}
.cr-card-meta .cr-lessons{font-size:12.5px;color:var(--cr-ink-2);font-variant-numeric:tabular-nums}
.cr-card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:auto;padding-top:14px;
}
.cr-price{font-size:18px;font-weight:750;letter-spacing:-.01em;color:var(--cr-ink);font-variant-numeric:tabular-nums}
.cr-price small{font-size:12px;font-weight:600;color:var(--cr-ink-3)}
.cr-member-tag{font-size:13.5px;font-weight:700;color:var(--cr-ink)}
.cr-card-cta{font-size:14px;font-weight:650;color:var(--cr-accent-strong);white-space:nowrap;text-decoration:none}

/* ---------- 7. 详情页 ---------- */
.cr-back{
  display:inline-flex;align-items:center;gap:6px;margin:18px 0 4px;
  font-size:14px;color:var(--cr-ink-2);text-decoration:none;
}
.cr-detail{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:40px;align-items:start;padding-top:8px}
.cr-detail-copy .cr-card-meta{margin:0 0 14px}
.cr-detail-cover{
  display:block;width:100%;aspect-ratio:16/9;margin:0 0 20px;
  border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);
  background:var(--cr-surface-2);object-fit:cover;box-shadow:var(--cr-shadow);
}
.cr-detail-copy h1{
  margin:0;font-size:clamp(24px,3.2vw,32px);line-height:1.25;letter-spacing:-.025em;color:var(--cr-ink);font-weight:750;
}
.cr-detail-problem{margin:14px 0 0;font-size:17px;line-height:1.6;color:var(--cr-ink);font-weight:600;max-width:600px;white-space:pre-line;overflow-wrap:anywhere}
.cr-detail-desc{margin:12px 0 0;font-size:15px;line-height:1.75;color:var(--cr-ink-2);max-width:600px}
.cr-detail-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:24px}
.cr-detail-actions form{margin:0}

.cr-buy{
  position:sticky;top:86px;
  background:var(--cr-surface);border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);
  box-shadow:var(--cr-shadow);padding:22px;
}
.cr-buy-type{font-size:12.5px;font-weight:700;letter-spacing:.08em;color:var(--cr-ink-3)}
.cr-buy-price{margin:8px 0 0;font-size:30px;font-weight:780;letter-spacing:-.02em;color:var(--cr-ink);font-variant-numeric:tabular-nums}
.cr-buy-price small{font-size:13px;font-weight:600;color:var(--cr-ink-3)}
.cr-buy-validity{margin:6px 0 0;font-size:13.5px;color:var(--cr-ink-2)}
.cr-buy-note{
  margin:14px 0 0;padding:11px 13px;border-radius:10px;
  background:var(--cr-amber-soft);color:var(--cr-amber);font-size:13px;line-height:1.55;
}
.cr-buy-owned{
  display:flex;align-items:center;gap:8px;margin:14px 0 0;padding:11px 13px;border-radius:10px;
  background:var(--cr-green-soft);color:var(--cr-green);font-size:13.5px;font-weight:650;
}
.cr-buy .cr-btn{width:100%;margin-top:16px}
.cr-buy-hint{margin:12px 0 0;font-size:12.5px;color:var(--cr-ink-3);text-align:center}

/* 课程介绍与可选详情图片 */
.cr-course-introduction,.cr-course-images{
  margin-top:34px;padding:26px;
  background:var(--cr-surface);border:1px solid var(--cr-line-soft);
  border-radius:var(--cr-radius-lg);box-shadow:var(--cr-shadow);
}
.cr-section-title h2{margin:5px 0 0;font-size:21px;letter-spacing:-.015em;color:var(--cr-ink)}
.cr-rich-introduction{max-width:760px;margin-top:18px;color:var(--cr-ink-2)}
.cr-rich-introduction h3{margin:24px 0 8px;font-size:17px;line-height:1.45;color:var(--cr-ink)}
.cr-rich-introduction p{margin:0 0 13px;font-size:15px;line-height:1.78}
.cr-rich-introduction ul{display:grid;gap:8px;margin:4px 0 16px;padding-left:22px}
.cr-rich-introduction li{padding-left:3px;font-size:15px;line-height:1.68}
.cr-rich-introduction strong{color:var(--cr-ink);font-weight:700}
.cr-introduction-more{margin-top:8px}
.cr-introduction-more summary{
  display:inline-flex;min-height:40px;align-items:center;padding:8px 13px;
  border-radius:10px;background:var(--cr-accent-soft);color:var(--cr-accent-strong);
  font-size:14px;font-weight:650;cursor:pointer;list-style:none;
}
.cr-introduction-more summary::-webkit-details-marker{display:none}
.cr-introduction-more .when-open{display:none}
.cr-introduction-more[open] .when-closed{display:none}
.cr-introduction-more[open] .when-open{display:inline}
.cr-introduction-more>div{margin-top:16px}
.cr-course-image-list{display:grid;gap:18px;margin-top:18px}
.cr-course-image-list figure{
  margin:0;overflow:hidden;border:1px solid var(--cr-line-soft);
  border-radius:var(--cr-radius-lg);background:var(--cr-surface-2);
}
.cr-course-image-list img{display:block;width:100%;height:auto}
.cr-course-image-list figcaption{padding:10px 14px;color:var(--cr-ink-3);font-size:13px;line-height:1.5}
.cr-course-source{margin:22px 0 42px;text-align:center;color:var(--cr-ink-3);font-size:13px}

/* 课程目录 */
.cr-catalog{margin-top:34px;padding-bottom:44px}
.cr-catalog-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:6px}
.cr-catalog-head h2{margin:0;font-size:20px;letter-spacing:-.015em;color:var(--cr-ink)}
.cr-catalog-head span{font-size:13px;color:var(--cr-ink-3);font-variant-numeric:tabular-nums}
.cr-chapter{margin-top:18px;background:var(--cr-surface);border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);overflow:hidden}
.cr-chapter-title{
  display:flex;align-items:center;gap:10px;padding:13px 18px;
  background:var(--cr-surface-2);border-bottom:1px solid var(--cr-line-soft);
  font-size:14px;font-weight:700;color:var(--cr-ink);
}
.cr-chapter-title span{font-weight:600;color:var(--cr-ink-3);font-size:12.5px;font-variant-numeric:tabular-nums}
.cr-lesson{
  display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:12px;align-items:center;
  padding:13px 18px;border-top:1px solid var(--cr-line-soft);
}
.cr-chapter .cr-lesson:first-of-type{border-top:0}
.cr-lesson-num{
  display:grid;place-items:center;width:26px;height:26px;border-radius:8px;
  background:var(--cr-surface-2);color:var(--cr-ink-3);font-size:12.5px;font-weight:650;font-variant-numeric:tabular-nums;
}
.cr-lesson-name{min-width:0}
.cr-lesson-name b{display:block;font-size:14.5px;font-weight:600;color:var(--cr-ink);line-height:1.4}
.cr-lesson-name small{display:block;margin-top:2px;font-size:12.5px;color:var(--cr-ink-3);line-height:1.45;white-space:pre-line;overflow-wrap:anywhere}
.cr-lesson-state{display:flex;align-items:center;gap:8px;flex:none}
.cr-lesson-play{
  display:inline-flex;align-items:center;gap:5px;min-height:34px;padding:6px 14px;border-radius:999px;
  background:var(--cr-accent-soft);color:var(--cr-accent-strong);font-size:13px;font-weight:650;text-decoration:none;
  transition:background-color .15s ease,color .15s ease;
}
.cr-lesson-static{font-size:12.5px;color:var(--cr-ink-3)}

/* ---------- 8. 购买咨询弹层 ---------- */
.classroom-page .purchase-dialog{width:min(480px,calc(100% - 28px))}
.classroom-page .purchase-dialog-shell{
  background:var(--cr-surface);border:1px solid var(--cr-line);border-radius:22px;
  box-shadow:var(--cr-shadow-hover);padding:26px;color:var(--cr-ink);
}
.classroom-page .purchase-close{background:var(--cr-surface-2);color:var(--cr-ink-2)}
.cr-buy-steps{margin:16px 0 0;padding:0;list-style:none;display:grid;gap:10px}
.cr-buy-steps li{display:flex;gap:11px;align-items:flex-start;font-size:14px;line-height:1.55;color:var(--cr-ink-2)}
.cr-buy-steps li b{
  flex:none;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;
  background:var(--cr-accent-soft);color:var(--cr-accent-strong);font-size:12px;font-weight:700;margin-top:1px;
}
.classroom-page .sales-contacts{display:flex;justify-content:center;gap:18px;margin-top:18px}
.classroom-page .sales-contact{display:grid;justify-items:center;gap:8px}
.classroom-page .sales-contact img{
  width:168px;height:168px;border-radius:14px;border:1px solid var(--cr-line);background:#fff;padding:6px;
}
.classroom-page .sales-contact span{font-size:13.5px;font-weight:600;color:var(--cr-ink-2)}

/* ---------- 9. 播放页 ---------- */
.cr-player-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;align-items:start;padding-top:10px}
.classroom-page .candidate-player{
  aspect-ratio:16/9;min-height:0;border-radius:var(--cr-radius-lg);
  background:var(--cr-player);box-shadow:var(--cr-shadow);
  display:grid;place-items:center;padding:28px;
}
.classroom-page .candidate-player.is-real{padding:0;overflow:hidden}
.classroom-page .real-player{position:relative;width:100%;height:100%;align-self:stretch;justify-self:stretch}
.classroom-page .candidate-player.is-real{position:relative}
/* 统一只保留自定义中心播放/暂停按钮，隐藏播放器自带的大号覆盖按钮。 */
.classroom-page .real-player .prism-big-play-btn,
.classroom-page .real-player .prism-player .prism-big-play-btn,
.classroom-page .real-player .prism-big-play-btn.prism-big-play-btn{display:none!important}
.cr-center-playback{
  position:absolute;z-index:12;left:50%;top:50%;transform:translate(-50%,-50%);
  width:76px;height:76px;border:1px solid rgba(255,255,255,.28);border-radius:50%;
  display:grid;place-items:center;background:rgba(10,12,20,.5);color:#fff;
  font:700 30px/1 system-ui;backdrop-filter:blur(10px);cursor:pointer;
  opacity:.18;transition:opacity .16s ease,transform .16s ease,background .16s ease;
}
.cr-center-playback[hidden]{display:none}
.cr-center-playback:hover,.cr-center-playback:focus-visible,.cr-center-playback.is-paused{
  opacity:1;background:rgba(10,12,20,.76)
}
.cr-center-playback:active{transform:translate(-50%,-50%) scale(.92)}
.cr-center-playback.is-feedback{animation:cr-play-feedback .3s ease-out}
@keyframes cr-play-feedback{50%{transform:translate(-50%,-50%) scale(1.12)}}
.cr-playback-compat{
  position:absolute;z-index:14;left:18px;right:18px;bottom:58px;padding:14px 16px;
  border:1px solid rgba(255,177,75,.58);border-radius:14px;
  background:rgba(24,18,12,.94);color:#fff;box-shadow:0 12px 30px rgba(0,0,0,.28)
}
.cr-playback-compat strong{display:block;font-size:14px}
.cr-playback-compat p{margin:5px 0 0;color:#e4d6c6;font-size:13px;line-height:1.55}
@media (prefers-reduced-motion:reduce){.cr-center-playback{transition:none}.cr-center-playback.is-feedback{animation:none}}
.classroom-page .player-placeholder,.classroom-page .player-simulator{max-width:520px;text-align:center;color:#e8e9ee}
.classroom-page .player-placeholder .cr-env{
  display:inline-block;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.14);font-size:12px;color:#c9cbd6;
}
.classroom-page .player-placeholder h2{margin:16px 0 8px;font-size:24px;letter-spacing:-.015em;color:#fff}
.classroom-page .player-placeholder p,.classroom-page .player-simulator p{color:#b7bac7;font-size:14px;line-height:1.6}
.classroom-page .player-simulator{width:min(480px,100%)}
.classroom-page .player-simulator input{width:100%;accent-color:var(--cr-accent)}
.classroom-page .player-simulator>div{display:flex;justify-content:space-between;color:#b7bac7;font-size:13px;font-variant-numeric:tabular-nums}
.cr-player-title{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:20px 2px 0}
.cr-player-title h1{margin:4px 0 0;font-size:21px;letter-spacing:-.02em;color:var(--cr-ink)}
.cr-player-title p{margin:8px 0 0;font-size:14px;color:var(--cr-ink-2);line-height:1.6;white-space:pre-line;overflow-wrap:anywhere}
.cr-player-title .eyebrow{margin:0}
.cr-side{
  background:var(--cr-surface);border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);
  box-shadow:var(--cr-shadow);padding:18px;align-self:start;
  position:sticky;top:86px;max-height:calc(100vh - 110px);overflow:auto;
}
.cr-side h2{margin:0 0 10px;font-size:14px;font-weight:700;color:var(--cr-ink)}
.cr-side h2:not(:first-child){margin-top:20px}
.cr-prevnext{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.cr-prevnext a,.cr-prevnext span{
  padding:10px 12px;border-radius:10px;font-size:12.5px;line-height:1.4;
  background:var(--cr-surface-2);color:var(--cr-ink);text-decoration:none;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.cr-prevnext span{color:var(--cr-ink-3)}
.cr-toc{display:grid;gap:4px}
.cr-toc a,.cr-toc span,.cr-toc strong{
  padding:9px 11px;border-radius:9px;font-size:13px;line-height:1.45;text-decoration:none;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.cr-toc a{color:var(--cr-ink-2)}
.cr-toc strong{background:var(--cr-accent-soft);color:var(--cr-accent-strong);font-weight:650}
.cr-toc span{color:var(--cr-ink-3)}
.classroom-page .attachment-button{
  display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;
  padding:11px 12px;margin-bottom:8px;border:1px solid var(--cr-line);border-radius:10px;
  background:var(--cr-surface);color:var(--cr-ink);font-size:13px;cursor:pointer;
  transition:background-color .15s ease;
}
.classroom-page .attachment-download-all{width:100%;margin-bottom:8px}
.classroom-page .cr-course-attachments{margin-top:34px;padding:24px;border:1px solid var(--cr-line);border-radius:var(--cr-radius-lg);background:var(--cr-surface)}
.classroom-page .cr-course-attachment-list{display:grid;gap:8px}
.classroom-page .cr-course-attachment-list .attachment-button{margin:0}
.classroom-page .cr-course-attachment-list .attachment-button>span{display:flex;flex-direction:column;align-items:flex-start;gap:2px}
.classroom-page .cr-course-attachment-list .attachment-button>span small{font-size:11px}
.classroom-page .cr-attachment-locked{margin:0;padding:12px;border:1px solid var(--cr-line);border-radius:12px;color:var(--cr-ink-3);font-size:13px;line-height:1.5;background:var(--cr-surface-2)}
.classroom-page .attachment-button small{color:var(--cr-ink-3)}

/* ---------- 10. 我的课程 ---------- */
.cr-page-head{padding:36px 0 6px}
.cr-page-head h1{margin:0;font-size:clamp(24px,3vw,30px);letter-spacing:-.025em;color:var(--cr-ink);font-weight:750}
.cr-page-head p{margin:8px 0 0;font-size:14.5px;color:var(--cr-ink-2)}
.cr-lib-section{margin-top:26px}
.cr-lib-section>h2{
  display:flex;align-items:center;gap:9px;margin:0 0 12px;font-size:17px;letter-spacing:-.015em;color:var(--cr-ink);
}
.cr-lib-section>h2::after{content:"";flex:1;height:1px;background:var(--cr-line-soft)}
.cr-lib{display:grid;gap:12px}
.cr-lib-card{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:center;
  padding:18px 20px;background:var(--cr-surface);border:1px solid var(--cr-line-soft);
  border-radius:var(--cr-radius-lg);box-shadow:var(--cr-shadow);
}
.cr-lib-card h3{margin:0;font-size:16.5px;letter-spacing:-.015em}
.cr-lib-card h3 a{color:var(--cr-ink);text-decoration:none}
.cr-lib-card .cr-card-meta{margin:0 0 8px}
.cr-progress{display:flex;align-items:center;gap:10px;margin-top:10px;max-width:420px}
.cr-progress-bar{flex:1;height:5px;border-radius:99px;background:var(--cr-surface-2);overflow:hidden}
.cr-progress-bar i{display:block;height:100%;border-radius:99px;background:var(--cr-accent)}
.cr-progress span{font-size:12.5px;color:var(--cr-ink-2);white-space:nowrap;font-variant-numeric:tabular-nums}
.cr-lib-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.cr-lib-actions form{margin:0}

/* ---------- 11. 空状态 / 无权页 / Toast ---------- */
.classroom-page .classroom-empty{
  background:var(--cr-surface);border:1px solid var(--cr-line-soft);border-radius:var(--cr-radius-lg);
  box-shadow:var(--cr-shadow);padding:52px 24px;text-align:center;
}
.classroom-page .classroom-empty h2,.classroom-page .classroom-empty h1{color:var(--cr-ink);letter-spacing:-.015em}
.classroom-page .classroom-empty p{color:var(--cr-ink-2)}
.classroom-page .classroom-empty .cr-ic-lg{color:var(--cr-ink-3);margin-bottom:6px}
.classroom-page .classroom-toast{
  background:var(--cr-ink);color:var(--cr-bg);box-shadow:var(--cr-shadow-hover);
  padding:12px 18px;border-radius:12px;font-size:14px;
}

/* ---------- 12. 悬停只给精确指针设备 ---------- */
@media (hover:hover) and (pointer:fine){
  .classroom-page .classroom-topbar nav a:hover{background:var(--cr-surface-2);color:var(--cr-ink)}
  .cr-card:hover{transform:translateY(-3px);box-shadow:var(--cr-shadow-hover);border-color:var(--cr-line)}
  .cr-card:hover .cr-cover-image{transform:scale(1.015)}
  .cr-btn-primary:hover{background:var(--cr-accent-strong)}
  .cr-btn-secondary:hover{background:var(--cr-surface-2)}
  .cr-btn-ghost:hover{background:var(--cr-accent-soft)}
  .cr-btn-danger:hover{background:var(--cr-red-soft)}
  .cr-cats a:hover{border-color:var(--cr-ink-3);color:var(--cr-ink)}
  .cr-card-body h3 a:hover{color:var(--cr-accent-strong)}
  .cr-card-cta:hover{text-decoration:underline}
  .cr-back:hover{color:var(--cr-ink)}
  .cr-lesson-play:hover{background:var(--cr-accent);color:var(--cr-on-accent)}
  .cr-prevnext a:hover{background:var(--cr-accent-soft);color:var(--cr-accent-strong)}
  .cr-toc a:hover{background:var(--cr-surface-2);color:var(--cr-ink)}
  .cr-lib-card h3 a:hover{color:var(--cr-accent-strong)}
  .classroom-page .attachment-button:hover{background:var(--cr-surface-2)}
}

/* ---------- 13. 响应式 ---------- */
@media(max-width:1024px){
  .cr-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cr-detail{grid-template-columns:minmax(0,1fr) 300px;gap:26px}
  .cr-player-layout{grid-template-columns:1fr}
  .cr-side{position:static;max-height:none}
}
@media(max-width:640px){
  .cr-intro{padding:26px 0 4px}
  .cr-intro h1{font-size:26px}
  .cr-searchbar{grid-template-columns:1fr;padding:10px}
  .cr-searchbar input{padding:8px 4px}
  .cr-searchbar .cr-btn{width:100%}
  .cr-grid{grid-template-columns:1fr}
  .cr-detail{grid-template-columns:1fr;gap:22px}
  .cr-detail-cover{border-radius:var(--cr-radius)}
  .cr-buy{position:static}
  .cr-course-introduction,.cr-course-images{margin-top:24px;padding:20px}
  .cr-lesson{grid-template-columns:26px minmax(0,1fr);row-gap:8px}
  .cr-lesson-state{grid-column:2;justify-content:flex-start}
  .cr-lib-card{grid-template-columns:1fr;gap:14px}
  .cr-lib-actions{justify-content:flex-start}
  .cr-lib-actions .cr-btn{width:100%}
  .cr-player-title{flex-direction:column}
  .cr-prevnext{grid-template-columns:1fr}
  .classroom-page .candidate-player{
    min-height:330px;aspect-ratio:auto;padding:22px 16px;
    border-radius:var(--cr-radius);
  }
}

/* ---------- 14. 动效约束 ---------- */
@media(prefers-reduced-motion:reduce){
  .cr-card,.cr-cover-image,.cr-btn,.cr-cats a,.cr-lesson-play,
  .classroom-page .classroom-topbar nav a,.classroom-page .attachment-button{transition:none}
  .cr-card:hover{transform:none}
  .classroom-page .cr-btn:active{transform:none}
}
@media(prefers-reduced-transparency:reduce){
  .classroom-page .classroom-topbar,.classroom-page .classroom-tabbar{
    background:var(--cr-bg);-webkit-backdrop-filter:none;backdrop-filter:none;
  }
}
@media(prefers-contrast:more){
  .classroom-page{--cr-line:currentColor;--cr-line-soft:rgba(29,29,31,.35)}
  .cr-card,.cr-buy,.cr-course-introduction,.cr-course-images,.cr-chapter{box-shadow:none}
}