/* 课程中心 · 课程组合 · 课程详情 —— 借鉴汇川星球页面逻辑，套用哈珀未来学院黑白视觉 */
.ch-search-hero{background:#0a0a0a url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><text x="0" y="20" fill="%23161616" font-size="14" font-family="monospace">01001101</text><text x="0" y="45" fill="%23161616" font-size="14" font-family="monospace">10110010</text><text x="0" y="70" fill="%23161616" font-size="14" font-family="monospace">00110101</text></svg>') repeat;color:#fff;padding:56px 0 44px;text-align:center}
.ch-search-hero h1{font-size:30px;margin:0 0 22px;font-weight:800}
.ch-search-box{max-width:640px;margin:0 auto;position:relative}
.ch-search-box input{width:100%;padding:16px 56px 16px 20px;border-radius:6px;border:0;font-size:15px}
.ch-search-box button{position:absolute;right:6px;top:6px;bottom:6px;width:44px;border:0;border-radius:4px;background:#111;color:#fff;cursor:pointer}

.ch-shell{width:min(1320px,calc(100% - 40px));margin:26px auto 70px}
.ch-filters{background:#fff;border:1px solid var(--line);border-radius:8px;padding:22px 26px;margin-bottom:22px}
.ch-filter-row{display:flex;gap:18px;padding:10px 0;border-bottom:1px solid var(--line)}
.ch-filter-row:last-child{border-bottom:0}
.ch-filter-label{flex:none;width:76px;padding-top:6px;font-weight:700;color:#333;font-size:14px}
.ch-filter-opts{flex:1;display:flex;flex-wrap:wrap;gap:8px 10px}
.ch-pill{border:1px solid transparent;background:transparent;padding:5px 4px;border-radius:5px;font-size:14px;color:#444;cursor:pointer;white-space:nowrap}
.ch-pill:hover{color:#111}
.ch-pill.active{color:#2f6fed;font-weight:700}
.ch-filter-reset{align-self:flex-start;margin-left:auto;flex:none;border:0;background:none;color:var(--muted);font-size:13px;cursor:pointer;padding-top:6px}

.ch-toolbar{display:flex;align-items:center;justify-content:space-between;padding:4px 2px 16px;flex-wrap:wrap;gap:12px}
.ch-sort{display:flex;gap:22px}
.ch-sort button{border:0;background:none;font-size:15px;color:#666;cursor:pointer;padding:4px 0}
.ch-sort button.active{color:#111;font-weight:800}
.ch-types{display:flex;gap:16px;font-size:14px;color:#444}
.ch-types label{display:flex;align-items:center;gap:5px;cursor:pointer}

.ch-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px 24px}
/* 白底卡片：圆角 + 柔和阴影，封面占顶部，内容区内边距；悬停时上浮并加深阴影 */
.ch-card{display:block;text-decoration:none;color:inherit;background:#fff;border:0;border-top:5px solid #111;border-radius:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:transform .2s,box-shadow .2s}
.ch-card:hover{transform:translateY(-3px);box-shadow:0 13px 28px rgba(0,0,0,.11)}
.ch-card-thumb{position:relative;height:190px;background:linear-gradient(135deg,#f1f2f6,#e2e5ee);display:flex;align-items:center;justify-content:center;overflow:hidden}
.ch-card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.ch-card-thumb .ch-emoji{font-size:56px;opacity:.88;filter:drop-shadow(0 5px 12px rgba(0,0,0,.14))}
.ch-card-badge{position:absolute;right:10px;bottom:10px;background:rgba(20,22,26,.72);color:#fff;font-size:11px;font-weight:500;letter-spacing:.3px;padding:4px 10px;border-radius:6px;display:flex;align-items:center;gap:5px;backdrop-filter:blur(4px)}
.ch-card-badge.video{background:rgba(0,161,214,.85)}
.ch-card-badge.collection{background:rgba(124,58,237,.85)}
.ch-card-body{padding:16px 18px 18px}
.ch-card-chip{display:inline-block;border:1px solid var(--line);border-radius:4px;padding:3px 9px;font-size:12px;color:#555;margin-bottom:8px}
.ch-card-open{display:block;color:#2f6fed;font-size:13px;font-weight:600;margin-bottom:10px}
.ch-card-body h3{font-size:16px;font-weight:700;color:#191c20;letter-spacing:.2px;line-height:1.45;margin:0 0 12px;min-height:46px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ch-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:14px}
.ch-tag{font-size:12px;font-weight:500;color:#5b6470;background:#f3f4f6;border-radius:6px;padding:4px 10px;letter-spacing:.2px}
.ch-card-foot{display:flex;align-items:center;justify-content:space-between;font-size:13px}
.ch-price{font-weight:800;color:#191c20;font-size:15px;letter-spacing:.3px}
.ch-price.free{color:#191c20}
.ch-price.member{color:#b8860b}
.ch-level{color:#9aa1a9;font-size:12px;display:flex;align-items:center;gap:4px}

.ch-empty{grid-column:1/-1;padding:70px 20px;text-align:center;color:var(--muted);border:1px dashed #ccc;border-radius:8px;background:#fff}

.ch-pager{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:34px;flex-wrap:wrap}
.ch-pager button{min-width:34px;height:34px;border:1px solid var(--line);background:#fff;border-radius:5px;cursor:pointer;font-size:13px}
.ch-pager button.active{background:#111;color:#fff;border-color:#111}
.ch-pager button:disabled{opacity:.4;cursor:default}
.ch-pager select{border:1px solid var(--line);border-radius:5px;padding:6px 8px;font-size:13px}
.ch-pager-count{color:var(--muted);font-size:13px;margin-left:10px}

@media(max-width:1080px){.ch-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:800px){.ch-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ch-filter-row{flex-direction:column;gap:8px}.ch-filter-label{width:auto}}
@media(max-width:520px){.ch-grid{grid-template-columns:1fr}.ch-search-hero h1{font-size:22px}}

/* ---- 课程详情：目录 / 详情 tab、课时列表、视频播放器 ---- */
.cd-hero-v2{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px;display:flex;gap:24px;align-items:center}
.cd-hero-thumb{flex:none;width:220px;height:130px;border-radius:8px;overflow:hidden;position:relative;background:linear-gradient(120deg,#eef1ff,#dfe6ff);display:flex;align-items:center;justify-content:center}
.cd-hero-thumb img{width:100%;height:100%;object-fit:cover}
.cd-hero-thumb .ch-card-badge{right:6px;bottom:6px}
.cd-hero-info{flex:1;min-width:0}
.cd-hero-info h1{font-size:22px;margin:0 0 8px}
.cd-hero-info .cd-desc{color:#555;font-size:14px;line-height:1.7;margin-bottom:14px}
.cd-progress-wrap{display:flex;align-items:center;gap:12px;margin-bottom:14px;font-size:13px;color:#555}
.cd-progress-bar{flex:1;max-width:360px;height:6px;border-radius:6px;background:#eceeef;overflow:hidden}
.cd-progress-bar i{display:block;height:100%;background:#2f6fed}
.cd-cta-row{display:flex;gap:12px;align-items:center}
.cd-cta{border:0;border-radius:6px;background:#111;color:#fff;padding:12px 28px;font-size:15px;font-weight:700;cursor:pointer}
.cd-cta.joined{background:#20a667}
.cd-cta:disabled{opacity:.6;cursor:default}

.cd-body-v2{display:grid;grid-template-columns:1fr 320px;gap:22px;margin-top:22px;align-items:start}
.cd-tabs{display:flex;gap:28px;border-bottom:1px solid var(--line);margin-bottom:0}
.cd-tabs button{border:0;background:none;padding:14px 2px;font-size:15px;color:#666;cursor:pointer;border-bottom:2px solid transparent}
.cd-tabs button.active{color:#111;font-weight:800;border-color:#111}
.cd-panel{background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 10px 10px;padding:20px 22px}

.cd-video{background:#000;border-radius:8px;overflow:hidden;margin-bottom:16px;position:relative;aspect-ratio:16/9}
.cd-video iframe{width:100%;height:100%;border:0;display:block}
.cd-video .cd-video-hint{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:#ccc;text-align:center;padding:20px}

.cd-lesson{display:flex;align-items:center;gap:12px;padding:14px 4px;border-top:1px solid var(--line);cursor:pointer}
.cd-lesson:first-child{border-top:0}
.cd-lesson:hover{background:#fafafa}
.cd-lesson.current{background:#f2f6ff}
.cd-lesson-idx{flex:none;width:26px;color:var(--muted);font-size:13px;text-align:center}
.cd-lesson-main{flex:1;min-width:0}
.cd-lesson-main b{display:block;font-size:14px;font-weight:600;color:#222;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cd-lesson-main span{font-size:12px;color:var(--muted)}
.cd-lesson-state{flex:none;font-size:12px;color:var(--muted)}
.cd-lesson-state.tag{color:#2f6fed;font-weight:700}
.cd-lesson.locked .cd-lesson-main b{color:#888}

.cd-noperm{padding:70px 20px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:10px}
.cd-noperm .icon{width:74px;height:74px;border-radius:50%;background:#eef0f2;display:flex;align-items:center;justify-content:center;font-size:34px;margin:0 auto 18px;color:#98a0a8}
.cd-noperm h3{font-size:17px;margin-bottom:6px}
.cd-noperm p{color:var(--muted);font-size:13px;margin-bottom:20px}

.cd-side .cd-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px;margin-bottom:16px}
.cd-side .cd-card h4{font-size:14px;margin-bottom:12px}
.cd-combo-link{display:flex;gap:10px;text-decoration:none;color:inherit;align-items:center}
.cd-combo-link img{width:64px;height:44px;object-fit:cover;border-radius:5px;background:#eee;flex:none}
.cd-combo-link b{font-size:13px;font-weight:600}

/* ---- 课程组合详情页 ---- */
.combo-hero{border-radius:12px;padding:54px 50px;background:#fff;color:#1a1a1a;position:relative;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.05);border:1px solid #eee}
.combo-hero .eyebrow{font-size:12px;letter-spacing:.1em;color:var(--muted);text-transform:uppercase;margin-bottom:10px}
.combo-hero h1{font-size:32px;margin:0 0 12px;color:#1a1a1a}
.combo-hero p{color:var(--muted);font-size:15px}
.combo-meta{margin:34px 0 18px}
.combo-meta h2{font-size:22px;margin-bottom:6px}
.combo-meta p{color:var(--muted);font-size:14px}

@media(max-width:900px){.cd-body-v2{grid-template-columns:1fr}.cd-hero-v2{flex-direction:column;align-items:stretch}.cd-hero-thumb{width:100%;height:180px}}