* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        html, body { min-height: 100%; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

        body {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            background: #ffffff;
        }

        .page-content {
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        /* ==================== 首屏 ==================== */
        .hero {
            position: relative;
            flex: 1;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #ffffff;
            overflow: hidden;
        }

        /* 背景碎片舞台：每个碎片是一张完整 cover 背景，用 clip-path 裁出网格小块 */
        .bg-debris {
            position: absolute;
            inset: 0;
            z-index: 1;
            pointer-events: none;
        }

        .shard {
            position: absolute;
            inset: 0;
            background-image: url('/cdn/file/index_bg.jpg');
            background-color: #10151c;
            background-size: cover;
            background-position: center center;
            will-change: transform, opacity;
        }

        /* 透明遮罩：直接显示原图，不做暗色处理 */
        .hero-overlay {
            position: absolute;
            inset: 0;
            z-index: 2;
            background: transparent;
            transition: opacity 0.1s linear;
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            z-index: 3;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            padding: 0 20px;
            will-change: transform, opacity;
        }

        /* 沉浸光感方块 */
        .core-block {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 240px;
            height: 240px;
            padding: 20px;
            border-radius: 26px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.28);
            box-shadow:
                0 0 0 1px rgba(255, 255, 255, 0.06) inset,
                0 8px 40px rgba(0, 0, 0, 0.45),
                0 0 60px rgba(120, 160, 255, 0.18),
                0 0 120px rgba(120, 160, 255, 0.08);
            color: #fff;
            transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.45s;
        }

        .core-block:hover {
            transform: translateY(-4px);
            box-shadow:
                0 0 0 1px rgba(255, 255, 255, 0.1) inset,
                0 12px 50px rgba(0, 0, 0, 0.5),
                0 0 80px rgba(120, 160, 255, 0.3),
                0 0 160px rgba(120, 160, 255, 0.14);
        }

        .core-block .logo-emoji {
            font-size: 3.4em;
            line-height: 1;
            margin-bottom: 6px;
            filter: drop-shadow(0 4px 16px rgba(255, 255, 255, 0.35));
        }

        .core-block h1 {
            font-size: 1.7em;
            font-weight: 700;
            letter-spacing: 5px;
            margin-bottom: 4px;
            text-shadow: 0 2px 24px rgba(0, 0, 0, 0.5);
        }

        .core-block p {
            font-size: 0.92em;
            opacity: 0.82;
            letter-spacing: 3px;
        }

        /* 两个连在一起的半透明小按钮 */
        .mini-btns {
            display: flex;
            margin-top: 30px;
        }

        .mini-btn {
            padding: 12px 34px;
            font-size: 0.95em;
            letter-spacing: 2px;
            color: #fff;
            text-decoration: none;
            background: rgba(255, 255, 255, 0.14);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-top: 1px solid rgba(255, 255, 255, 0.24);
            border-bottom: 1px solid rgba(255, 255, 255, 0.24);
            transition: background 0.3s, transform 0.3s;
            white-space: nowrap;
        }

        .mini-btn + .mini-btn {
            border-left: none;
        }

        .mini-btn:first-child {
            border-left: 1px solid rgba(255, 255, 255, 0.24);
            border-radius: 40px 0 0 40px;
        }

        .mini-btn:last-child {
            border-right: 1px solid rgba(255, 255, 255, 0.24);
            border-radius: 0 40px 40px 0;
        }

        .mini-btn:hover {
            background: rgba(255, 255, 255, 0.28);
            transform: translateY(-2px);
        }

        /* 上下浮动箭头 + 探索一下 */
        .scroll-cue {
            position: absolute;
            left: 50%;
            /* 贴在底栏上方 26px：底栏一行时是 96px，底栏变成多行时自动抬高 */
            bottom: calc(var(--footer-h, 70px) + 26px);
            transform: translateX(-50%);
            z-index: 3;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            color: rgba(255, 255, 255, 0.86);
            text-decoration: none;
            cursor: pointer;
            transition: opacity 0.1s linear, bottom 0.22s ease;
            will-change: opacity;
        }

        .cue-arrow {
            font-size: 1.7em;
            line-height: 1;
            animation: cueFloat 1.8s ease-in-out infinite;
            filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.4));
        }

        .cue-text {
            font-size: 0.82em;
            letter-spacing: 5px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
        }

        @keyframes cueFloat {
            0%, 100% { transform: translateY(0); }
            50%      { transform: translateY(9px); }
        }

        /* ==================== 介绍区（整页） ==================== */
        .about {
            background: #ffffff;
            min-height: 100vh;
            padding: 90px 24px 100px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .about-inner {
            max-width: 1000px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .about-text {
            flex: 1;
            opacity: 0;
            transform: translateY(46px);
            transition: opacity 0.9s ease, transform 0.9s ease;
        }

        .about-media {
            flex: 1;
            opacity: 0;
            transform: translateY(46px);
            transition: opacity 0.9s ease 0.18s, transform 0.9s ease 0.18s;
        }

        .about.visible .about-text,
        .about.visible .about-media {
            opacity: 1;
            transform: translateY(0);
        }

        .about-text h2 {
            font-size: 1.9em;
            color: #1c2733;
            margin-bottom: 16px;
            letter-spacing: 2px;
        }

        .about-text p {
            font-size: 1.05em;
            line-height: 1.9;
            color: #55606b;
        }

        /* 4:3 图片占位符 */
        .img-placeholder {
            width: 100%;
            aspect-ratio: 4 / 3;
            border-radius: 14px;
            background:
                linear-gradient(135deg, rgba(28, 39, 51, 0.05) 25%, transparent 25%) 0 0 / 24px 24px,
                linear-gradient(225deg, rgba(28, 39, 51, 0.05) 25%, transparent 25%) 0 0 / 24px 24px,
                #f0f3f6;
            border: 2px dashed #b8c2cc;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #8a95a1;
            font-size: 0.95em;
            letter-spacing: 2px;
            text-align: center;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
        }

        @media (max-width: 768px) {
            .hero { min-height: 100vh; }
            .core-block { width: 180px; height: 180px; }
            .core-block .logo-emoji { font-size: 2.6em; }
            .core-block h1 { font-size: 1.35em; letter-spacing: 3px; }
            .mini-btn { padding: 10px 20px; font-size: 0.88em; }
            .cue-arrow { font-size: 1.4em; }

            .about { padding: 56px 20px 96px; min-height: 100vh; }
            .about-inner { flex-direction: column; gap: 36px; }
            .about-text h2 { font-size: 1.55em; }
            .about-text p { font-size: 1em; }
        }

        /* ==================== 首页：图片整屏覆盖（含顶部与底部） ==================== */
        body.home-page > header,
        body.home-page > footer {
            background: transparent !important;
            box-shadow: none !important;
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }

        body.home-page > header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 60;
        }

        body.home-page > header a {
            color: #fff;
            text-shadow: 0 1px 12px rgba(0, 0, 0, 0.55);
        }

        body.home-page > footer {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 60;
            background: rgba(20, 28, 40, 0.72) !important;
            color: #fff !important;
        }

        body.home-page > header.scrolled {
            background: rgba(44, 62, 80, 0.92) !important;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15) !important;
            text-shadow: none;
        }