/* ============================================================
   课时云记 · 产品演示页（/demo）基础样式
   1. 页面外壳（深色首屏 + 浅色说明区）
   2. 播放器与控制条（含全屏 / 伪全屏）
   3. 舞台基础层（背景光晕 / 粒子画布 / 字幕 / 章节标签）
   4. 舞台通用组件（卡片 / 光标 / 提示 / 标签 / 初始隐藏类）
   各个镜头的专属样式见 demo-scenes.css
   舞台逻辑尺寸固定 1280×720，由 JS 按容器宽度等比缩放
   ============================================================ */

/* ---------- 1. 页面外壳 ---------- */
.demo-page {
    background: var(--bg-page, #f8fafc);
}

.demo-hero {
    position: relative;
    padding: 108px 0 54px;
    color: #e8ecf8;
    overflow: hidden;
    background:
        radial-gradient(900px 420px at 50% -80px, rgba(99, 102, 241, .42), rgba(99, 102, 241, 0) 70%),
        radial-gradient(640px 360px at 96% 38%, rgba(34, 211, 238, .13), rgba(34, 211, 238, 0) 70%),
        radial-gradient(560px 320px at 2% 70%, rgba(139, 92, 246, .16), rgba(139, 92, 246, 0) 70%),
        linear-gradient(180deg, #0b1030 0%, #070a1c 100%);
}

.demo-hero-head {
    text-align: center;
    margin-bottom: 28px;
}

.demo-hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: .82rem;
    font-weight: 600;
    color: #c7d2fe;
    background: rgba(99, 102, 241, .16);
    border: 1px solid rgba(129, 140, 248, .35);
}

.demo-hero h1 {
    margin: 16px 0 10px;
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -.5px;
    line-height: 1.25;
    color: #fff;
}

.demo-hero h1 em {
    font-style: normal;
    background: linear-gradient(90deg, #a5b4fc, #22d3ee);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.demo-hero .demo-lead {
    max-width: 760px;
    margin: 0 auto;
    font-size: 1.04rem;
    color: #a8b3d6;
}

.demo-chapters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 1120px;
    margin: 20px auto 0;
}

.demo-chap {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid rgba(129, 140, 248, .28);
    background: rgba(99, 102, 241, .1);
    color: #c7d2fe;
    font-size: .86rem;
    line-height: 1.2;
    cursor: pointer;
    transition: all .2s ease;
    -webkit-tap-highlight-color: transparent;
}

.demo-chap b {
    font-weight: 700;
    color: #818cf8;
    font-variant-numeric: tabular-nums;
}

.demo-chap:hover {
    background: rgba(99, 102, 241, .24);
    color: #fff;
}

.demo-chap.active {
    background: linear-gradient(135deg, #4f46e5, #0891b2);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 6px 18px -6px rgba(79, 70, 229, .8);
}

.demo-chap.active b {
    color: #fff;
}

.demo-tip {
    margin-top: 14px;
    text-align: center;
    font-size: .82rem;
    color: #7c88b0;
}

.demo-tip i {
    color: #818cf8;
    margin-right: 4px;
}

/* 播放器下方的字幕条：仅在手机竖屏等窄屏显示，保证字幕足够大 */
.demo-caption {
    display: none;
    padding: 12px 16px 14px;
    text-align: center;
    background: #0a0f2e;
    border-top: 1px solid rgba(129, 140, 248, .14);
    min-height: 74px;
}

.demo-caption .dc-t {
    font-size: 1.02rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.4;
}

.demo-caption .dc-t em {
    font-style: normal;
    color: #67e8f9;
}

.demo-caption .dc-s {
    margin-top: 2px;
    font-size: .8rem;
    color: #94a3c4;
    line-height: 1.5;
}

/* 说明区（浅色） */
.demo-intro {
    padding: 64px 0 28px;
}

.demo-intro-card {
    height: 100%;
    padding: 26px 24px;
    background: #fff;
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 20px;
    transition: all .3s ease;
}

.demo-intro-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 35px -10px rgba(15, 23, 42, .1);
    border-color: rgba(79, 70, 229, .3);
}

.demo-intro-ico {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
    margin-bottom: 14px;
}

.demo-intro-ico.i1 { background: linear-gradient(135deg, #4f46e5, #6366f1); }
.demo-intro-ico.i2 { background: linear-gradient(135deg, #059669, #10b981); }
.demo-intro-ico.i3 { background: linear-gradient(135deg, #0891b2, #22d3ee); }
.demo-intro-ico.i4 { background: linear-gradient(135deg, #7c3aed, #a78bfa); }

.demo-intro-card h3 {
    font-size: 1.08rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 8px;
}

.demo-intro-card p {
    font-size: .88rem;
    color: #64748b;
    margin-bottom: 12px;
}

.demo-intro-card a {
    font-size: .86rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--brand-primary, #4f46e5);
}

.demo-scope {
    padding: 28px 0 8px;
}

/* 副标题两行时尽量均衡断行，避免末行只剩一两个字（不支持的浏览器自动忽略） */
.demo-intro .section-subtitle,
.demo-scope .section-subtitle {
    text-wrap: balance;
}

.demo-scope-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    margin: 4px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid #e2e8f0;
    font-size: .86rem;
    color: #334155;
}

.demo-scope-chip i {
    color: var(--brand-primary, #4f46e5);
}

/* ---------- 2. 播放器与控制条 ---------- */
.demo-player {
    position: relative;
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    background: #060919;
    border: 1px solid rgba(129, 140, 248, .3);
    border-radius: 22px;
    overflow: hidden;
    outline: none;
    box-shadow: 0 34px 90px -24px rgba(79, 70, 229, .6), 0 0 0 1px rgba(255, 255, 255, .03) inset;
    -webkit-tap-highlight-color: transparent;
}

.demo-player:focus-visible {
    box-shadow: 0 0 0 3px rgba(129, 140, 248, .7), 0 34px 90px -24px rgba(79, 70, 229, .6);
}

/* 16:9 视口：用 padding-top 撑高，兼容不支持 aspect-ratio 的旧内核 */
.demo-viewport {
    position: relative;
    width: 100%;
    height: 0;
    padding-top: 56.25%;
    overflow: hidden;
    background: #060919;
    cursor: pointer;
}

.demo-stage {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    overflow: hidden;
    transform-origin: 0 0;
    background: radial-gradient(1100px 640px at 50% 36%, #151c52 0%, #0b1133 46%, #060919 100%);
    color: #e8ecf8;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    -webkit-user-select: none;
    user-select: none;
    --g1: rgba(99,102,241,.34);
    --g2: rgba(34,211,238,.22);
}

.demo-bigplay {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 6;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 0;
    border: 0;
    background: transparent;
    color: #fff;
    cursor: pointer;
}

.demo-bigplay .bp-ico {
    width: 86px;
    height: 86px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    padding-left: 5px;
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
    box-shadow: 0 14px 40px -6px rgba(79, 70, 229, .9), 0 0 0 10px rgba(129, 140, 248, .18);
    animation: demoPulse 2.2s ease-out infinite;
}

.demo-bigplay .bp-txt {
    padding: 6px 16px;
    border-radius: 999px;
    font-size: .9rem;
    font-weight: 600;
    letter-spacing: .5px;
    background: rgba(8, 12, 38, .72);
    border: 1px solid rgba(165, 180, 252, .3);
}

@keyframes demoPulse {
    0% { box-shadow: 0 14px 40px -6px rgba(79, 70, 229, .9), 0 0 0 0 rgba(129, 140, 248, .5); }
    70% { box-shadow: 0 14px 40px -6px rgba(79, 70, 229, .9), 0 0 0 26px rgba(129, 140, 248, 0); }
    100% { box-shadow: 0 14px 40px -6px rgba(79, 70, 229, .9), 0 0 0 0 rgba(129, 140, 248, 0); }
}

/* 开始前盖一层暗幕，让「播放」按钮更醒目 */
.demo-veil {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    background: radial-gradient(closest-side, rgba(6, 9, 25, .1), rgba(6, 9, 25, .55));
    transition: opacity .35s ease, visibility .35s;
}

.demo-started .demo-veil,
.demo-started .demo-bigplay {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* 播放结束后的操作条 */
.demo-end {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 5.5%;
    z-index: 7;
    display: flex;
    justify-content: center;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all .45s ease;
}

.demo-ended .demo-end {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.demo-end .de-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 999px;
    border: 1px solid rgba(165, 180, 252, .45);
    background: rgba(8, 12, 38, .78);
    color: #fff;
    font-size: .95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all .2s ease;
}

.demo-end .de-btn:hover {
    background: rgba(99, 102, 241, .45);
    color: #fff;
}

.demo-end .de-btn.primary {
    border-color: transparent;
    background: linear-gradient(135deg, #4f46e5, #0891b2);
    box-shadow: 0 10px 26px -8px rgba(79, 70, 229, .9);
}

.demo-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 14px;
    background: linear-gradient(180deg, #0c1236, #080c26);
    border-top: 1px solid rgba(129, 140, 248, .18);
    color: #cbd5f5;
}

.dc-btn {
    flex: 0 0 auto;
    min-width: 34px;
    height: 34px;
    padding: 0 8px;
    border: 0;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #e0e7ff;
    background: rgba(129, 140, 248, .14);
    cursor: pointer;
    transition: background .2s ease;
}

.dc-btn:hover {
    background: rgba(129, 140, 248, .32);
}

.dc-time {
    flex: 0 0 auto;
    min-width: 86px;
    font-size: 13px;
    color: #94a3c4;
    font-variant-numeric: tabular-nums;
}

.dc-time b {
    font-weight: 600;
    color: #e0e7ff;
}

.dc-track {
    position: relative;
    flex: 1 1 auto;
    height: 26px;
    cursor: pointer;
    touch-action: none;
}

.dc-track::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 4px;
    margin-top: -2px;
    border-radius: 4px;
    background: rgba(148, 163, 184, .25);
}

.dc-fill {
    position: absolute;
    left: 0;
    top: 50%;
    width: 0;
    height: 4px;
    margin-top: -2px;
    border-radius: 4px;
    background: linear-gradient(90deg, #6366f1, #22d3ee);
}

.dc-mark {
    position: absolute;
    top: 50%;
    width: 2px;
    height: 12px;
    margin: -6px 0 0 -1px;
    border-radius: 1px;
    background: rgba(255, 255, 255, .38);
    pointer-events: none;
}

.dc-knob {
    position: absolute;
    top: 50%;
    left: 0;
    width: 14px;
    height: 14px;
    margin: -7px 0 0 -7px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, .38);
    pointer-events: none;
}

.dc-tip {
    position: absolute;
    bottom: 28px;
    left: 0;
    padding: 4px 9px;
    border-radius: 7px;
    background: #141c52;
    border: 1px solid rgba(129, 140, 248, .4);
    color: #fff;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    transform: translateX(-50%);
    pointer-events: none;
    transition: opacity .15s ease;
}

.dc-track:hover .dc-tip,
.dc-track.dragging .dc-tip {
    opacity: 1;
}

/* 全屏：桌面端走浏览器 Fullscreen API，手机端（含微信 / iOS）走伪全屏 */
.demo-lock {
    overflow: hidden !important;
}

.demo-player.is-fs {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    max-width: none;
    margin: 0;
    border: 0;
    border-radius: 0;
    z-index: 2000;
    background: #000;
    box-shadow: none;
}

.demo-player.is-fs .demo-viewport {
    flex: 1 1 0;
    height: auto;
    min-height: 0;
    padding-top: 0;
}

.demo-player.is-fs .demo-caption {
    display: none;
}

/* 竖屏手机上的伪全屏：整体旋转 90°，让横向动画占满竖屏（尺寸由脚本写入内联样式） */
.demo-player.is-rot {
    transform-origin: 0 0;
    transform: rotate(90deg);
}

/* ---------- 3. 舞台基础层 ---------- */
.dm-glow {
    position: absolute;
    width: 920px;
    height: 920px;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform;
}

.dm-glow.g1 {
    left: -240px;
    top: -330px;
    background: radial-gradient(closest-side, var(--g1), rgba(0, 0, 0, 0));
}

.dm-glow.g2 {
    right: -280px;
    bottom: -420px;
    background: radial-gradient(closest-side, var(--g2), rgba(0, 0, 0, 0));
}

.dm-grid {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(129, 140, 248, .07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(129, 140, 248, .07) 1px, transparent 1px);
    background-size: 48px 48px;
    background-position: center center;
    -webkit-mask-image: radial-gradient(closest-side at 50% 46%, #000 25%, transparent 100%);
    mask-image: radial-gradient(closest-side at 50% 46%, #000 25%, transparent 100%);
}

.dm-bg-canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    pointer-events: none;
}

.dm-scenes,
.dm-chaps,
.dm-cues {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    pointer-events: none;
}

.dm-scene {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    opacity: 0;
    visibility: hidden;
}

/* 镜头切换时横扫而过的光带 */
.dm-sweep {
    position: absolute;
    left: 0;
    top: -120px;
    width: 280px;
    height: 960px;
    pointer-events: none;
    transform: skewX(-16deg);
    background: linear-gradient(90deg, rgba(99, 102, 241, 0), rgba(129, 140, 248, .26) 40%, rgba(34, 211, 238, .2) 60%, rgba(34, 211, 238, 0));
    opacity: 0;
    visibility: hidden;
}

/* 左上角章节标签 */
.dm-chap {
    position: absolute;
    left: 34px;
    top: 26px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 16px 7px 8px;
    border-radius: 999px;
    background: rgba(99, 102, 241, .16);
    border: 1px solid rgba(165, 180, 252, .32);
    font-size: 15px;
    font-weight: 600;
    color: #e0e7ff;
    letter-spacing: .5px;
    opacity: 0;
    visibility: hidden;
}

.dm-chap b {
    min-width: 28px;
    height: 28px;
    padding: 0 6px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: #fff;
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
}

/* 右上角品牌水印 */
.dm-brand {
    position: absolute;
    right: 34px;
    top: 28px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    color: rgba(226, 232, 255, .86);
    opacity: 0;
    visibility: hidden;
}

.dm-brand img {
    width: 26px;
    height: 26px;
    border-radius: 7px;
}

/* 字幕（标题 + 副标题），位置由镜头的 cueBox 决定，默认位于底部居中 */
.dm-cue {
    position: absolute;
    left: 60px;
    right: 60px;
    bottom: 34px;
    text-align: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
}

.dm-cue-t {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.28;
    letter-spacing: 1px;
    color: #fff;
    text-shadow: 0 4px 24px rgba(8, 12, 48, .95), 0 0 2px rgba(8, 12, 48, .9);
}

.dm-cue-t .dm-ch {
    display: inline-block;
    opacity: 0;
    transform: translateY(14px);
}

.dm-cue-t .hl {
    color: #67e8f9;
    text-shadow: 0 0 22px rgba(34, 211, 238, .55), 0 4px 24px rgba(8, 12, 48, .95);
}

.dm-cue-s {
    margin-top: 8px;
    font-size: 19px;
    line-height: 1.5;
    letter-spacing: .5px;
    color: #aab6dd;
    text-shadow: 0 2px 14px rgba(8, 12, 48, .95);
    opacity: 0;
    transform: translateY(8px);
}

/* ---------- 4. 舞台通用组件 ---------- */
/* 初始隐藏态：由时间轴 to() 补间到自然状态，保证拖动进度条时可逆 */
.h { opacity: 0; visibility: hidden; }
.h-up { opacity: 0; visibility: hidden; transform: translateY(26px); }
.h-down { opacity: 0; visibility: hidden; transform: translateY(-26px); }
.h-left { opacity: 0; visibility: hidden; transform: translateX(-44px); }
.h-right { opacity: 0; visibility: hidden; transform: translateX(44px); }
.h-pop { opacity: 0; visibility: hidden; transform: scale(.82); }
.h-zoom { opacity: 0; visibility: hidden; transform: scale(1.18); }

.dm-abs { position: absolute; }

/* 白色 UI 卡片 */
.dm-card {
    background: #fff;
    color: #0f172a;
    border-radius: 14px;
    box-shadow: 0 22px 46px -14px rgba(2, 6, 40, .7), 0 0 0 1px rgba(255, 255, 255, .06);
}

/* 假光标与点击涟漪 */
.dm-cur {
    position: absolute;
    left: 0;
    top: 0;
    width: 0;
    height: 0;
    z-index: 60;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.dm-cur .dm-cur-in {
    position: absolute;
    left: 0;
    top: 0;
    transform-origin: 0 0;
}

.dm-cur svg {
    position: absolute;
    left: -5px;
    top: -3px;
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, .45));
}

.dm-cur.touch .dm-cur-dot {
    position: absolute;
    left: -17px;
    top: -17px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .55);
    border: 2px solid rgba(79, 70, 229, .85);
    box-shadow: 0 6px 18px rgba(2, 6, 40, .45);
}

.dm-cur .dm-cur-rip {
    position: absolute;
    left: -22px;
    top: -22px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 3px solid rgba(34, 211, 238, .95);
    background: rgba(34, 211, 238, .22);
    opacity: 0;
    visibility: hidden;
    transform: scale(.2);
}

/* 高亮光圈（强调某个按钮 / 区域） */
.dm-ring {
    position: absolute;
    border-radius: 12px;
    border: 3px solid #22d3ee;
    box-shadow: 0 0 0 4px rgba(34, 211, 238, .22), 0 0 24px rgba(34, 211, 238, .65);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 40;
}

/* 飘字：+10 / -1 */
.dm-float {
    position: absolute;
    z-index: 50;
    font-size: 22px;
    font-weight: 800;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    text-shadow: 0 2px 10px rgba(0, 0, 0, .35);
}

.dm-float.red { color: #f43f5e; }
.dm-float.green { color: #10b981; }
.dm-float.cyan { color: #22d3ee; }
.dm-float.amber { color: #f59e0b; }

/* 提示条（Toast） */
.dm-toast {
    position: absolute;
    z-index: 55;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    background: rgba(15, 23, 42, .92);
    box-shadow: 0 14px 30px -8px rgba(2, 6, 40, .7);
    opacity: 0;
    visibility: hidden;
}

.dm-toast i { color: #34d399; }

/* 小标签 */
.dm-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
}

.dm-tag.indigo { background: #eef2ff; color: #4f46e5; }
.dm-tag.green { background: #dcfce7; color: #15803d; }
.dm-tag.red { background: #fee2e2; color: #dc2626; }
.dm-tag.amber { background: #fef3c7; color: #b45309; }
.dm-tag.cyan { background: #cffafe; color: #0e7490; }
.dm-tag.gray { background: #f1f5f9; color: #64748b; }

/* 通用 SVG 文字 */
.dm-svg-text {
    font-family: inherit;
    fill: #e8ecf8;
}

/* ---------- 5. 响应式（外壳与控制条） ---------- */
@media (max-width: 991px) {
    .demo-hero h1 { font-size: 2.1rem; }
}

@media (max-width: 767px) {
    .demo-hero { padding: 92px 0 36px; }
    .demo-hero h1 { font-size: 1.7rem; }
    .demo-hero .demo-lead { font-size: .94rem; }
    .demo-player { border-radius: 14px; }
    /* 窄屏：字幕改由下方字幕条显示，舞台内字幕隐藏避免过小 */
    .demo-player:not(.is-fs) .dm-cues { display: none; }
    .demo-player:not(.is-fs) .demo-caption { display: block; }
    .demo-controls { gap: 8px; padding: 8px 10px; }
    .dc-time { min-width: 0; font-size: 12px; }
    .dc-time .dc-sep, .dc-time .dc-tot { display: none; }
    .demo-bigplay .bp-ico { width: 60px; height: 60px; font-size: 22px; }
    .demo-bigplay .bp-txt { font-size: .78rem; padding: 4px 12px; }
    .demo-end { bottom: 3%; gap: 8px; }
    .demo-end .de-btn { padding: 7px 14px; font-size: .78rem; }
    .demo-chap { padding: 6px 11px; font-size: .78rem; }
}

@media (prefers-reduced-motion: reduce) {
    .demo-bigplay .bp-ico { animation: none; }
}