:root {
            --yy-primary: #22d3ee;
            --yy-accent: #fb923c;
            --yy-bg: #0f172a;
            --yy-text: #e2e8f0;
            --yy-muted: #94a3b8;
            --yy-card-bg: #1e293b;
            --yy-border: #334155;
            --yy-radius-lg: 24px;
            --yy-radius-md: 18px;
            --yy-radius-sm: 12px;
            --yy-shadow: 0 20px 35px -8px rgba(0,0,0,0.4), 0 8px 18px -6px rgba(34,211,238,0.08);
        }
        * { box-sizing: border-box; }
        body {
            background-color: var(--yy-bg);
            color: var(--yy-text);
            font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
            font-weight: 300;
            letter-spacing: 0.2px;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, .serif-title {
            font-family: 'Noto Serif SC', 'Inter', serif;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        /* 大圆角柔和风 */
        .card, .rounded-card, .custom-block {
            border-radius: var(--yy-radius-lg) !important;
            border: 1px solid var(--yy-border);
            background: rgba(30, 41, 59, 0.6);
            backdrop-filter: blur(2px);
            box-shadow: var(--yy-shadow);
        }
        /* 导航 */
        .navbar-yy {
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--yy-border);
            border-radius: 0 0 28px 28px;
            padding: 0.8rem 1.5rem;
            margin-bottom: 1rem;
            box-shadow: 0 8px 30px -10px rgba(0,0,0,0.6);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--yy-primary) !important;
            font-family: 'Noto Serif SC', serif;
            letter-spacing: 1px;
            transition: 0.2s;
        }
        .navbar-brand:hover { text-shadow: 0 0 20px #22d3ee80; }
        .navbar-nav .nav-link {
            color: var(--yy-text) !important;
            font-weight: 400;
            padding: 0.5rem 1.2rem;
            border-radius: 40px;
            transition: 0.2s;
        }
        .navbar-nav .nav-link:hover {
            color: var(--yy-accent) !important;
            background: rgba(251, 146, 60, 0.08);
        }
        .navbar-toggler {
            border: 1px solid var(--yy-border);
            color: var(--yy-text);
        }
        .navbar-toggler:focus { box-shadow: 0 0 0 2px #fb923c40; }

        /* hero 渐变文字 + 浮动装饰 */
        .hero-title {
            font-size: 4rem;
            font-weight: 900;
            line-height: 1.1;
            background: linear-gradient(120deg, #22d3ee 0%, #f0abfc 45%, #fb923c 80%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            animation: heroFloat 6s ease-in-out infinite;
        }
        @keyframes heroFloat {
            0%,100% { transform: translateY(0); }
            50% { transform: translateY(-12px); }
        }
        .hero-float-icon {
            position: absolute;
            font-size: 3rem;
            opacity: 0.25;
            filter: drop-shadow(0 0 20px #22d3ee);
            animation: floaty 8s infinite alternate ease-in-out;
        }
        @keyframes floaty {
            0% { transform: translateY(0) rotate(0deg); }
            100% { transform: translateY(-30px) rotate(8deg); }
        }
        /* parallax 背景 */
        .parallax-hero {
            background-image: radial-gradient(circle at 20% 30%, #164e63 0%, #0f172a 60%);
            background-attachment: fixed;
            background-position: center;
            background-size: cover;
        }

        /* 时间线/步骤条 */
        .timeline-container {
            position: relative;
            padding-left: 30px;
        }
        .timeline-container::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, var(--yy-primary), var(--yy-accent));
            border-radius: 10px;
            opacity: 0.5;
        }
        .timeline-step {
            position: relative;
            margin-bottom: 28px;
            padding-left: 20px;
        }
        .timeline-step::before {
            content: '';
            position: absolute;
            left: -22px;
            top: 8px;
            width: 16px;
            height: 16px;
            background: var(--yy-bg);
            border: 3px solid var(--yy-primary);
            border-radius: 50%;
            box-shadow: 0 0 0 5px #22d3ee20;
        }
        .timeline-step h3 { font-weight: 600; }

        /* 对比表格 */
        .compare-table {
            border-collapse: separate;
            border-spacing: 0 10px;
            width: 100%;
        }
        .compare-table td, .compare-table th {
            background: #1e293b;
            padding: 16px 18px;
            border-radius: var(--yy-radius-md);
            border: 1px solid #2c3a4f;
        }
        .compare-table th {
            font-family: 'Noto Serif SC', serif;
            background: #172032;
            color: var(--yy-primary);
            font-weight: 700;
        }
        .compare-table tr:first-child th:first-child { border-radius: 20px 0 0 20px; }
        .compare-table tr:first-child th:last-child { border-radius: 0 20px 20px 0; }

        /* 按钮光泽扫过 */
        .btn-gloss {
            position: relative;
            overflow: hidden;
            transition: transform 0.2s, box-shadow 0.3s;
            border-radius: 50px;
            font-weight: 500;
            z-index: 1;
        }
        .btn-gloss::after {
            content: '';
            position: absolute;
            top: 0;
            left: -80%;
            width: 50%;
            height: 100%;
            background: linear-gradient(120deg, transparent, rgba(255,255,255,0.45), transparent);
            transform: skewX(-25deg);
            transition: 0.6s;
            z-index: 0;
        }
        .btn-gloss:hover::after {
            left: 150%;
        }
        .btn-gloss:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px -8px #fb923c60;
        }

        /* 滚动淡入 */
        .fade-up {
            opacity: 0;
            transform: translateY(40px);
            transition: opacity 0.7s cubic-bezier(0.2,0.9,0.3,1), transform 0.7s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* 区块标题 */
        .section-title {
            font-size: 2.8rem;
            font-weight: 800;
            margin-bottom: 2.5rem;
            letter-spacing: -0.02em;
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60%;
            height: 5px;
            background: linear-gradient(90deg, var(--yy-primary), var(--yy-accent));
            border-radius: 20px;
        }
        .link-plain { color: var(--yy-accent); text-decoration: none; }
        .link-plain:hover { color: var(--yy-primary); text-decoration: underline; }
        footer a { color: var(--yy-text); text-decoration: none; }
        footer a:hover { color: var(--yy-accent); }
        .friend-link a {
            display: inline-block;
            padding: 0.3rem 1rem;
            background: #1e293b;
            border-radius: 30px;
            margin: 0 0.5rem 0.5rem 0;
            border: 1px solid var(--yy-border);
            transition: 0.2s;
            color: var(--yy-text);
        }
        .friend-link a:hover {
            background: #fb923c20;
            border-color: var(--yy-accent);
        }
        .card-icon-circle {
            width: 60px; height: 60px;
            background: #172032;
            border-radius: 20px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.8rem;
            color: var(--yy-primary);
            margin-bottom: 1rem;
            border: 1px solid #2a3a52;
        }
        /* 通用 */
        .btn-primary-yy {
            background: linear-gradient(135deg, #22d3ee, #0ea5b7);
            border: none;
            color: #0f172a;
            font-weight: 600;
            border-radius: 60px;
            padding: 0.8rem 2.2rem;
            box-shadow: 0 8px 24px #22d3ee30;
        }
        .btn-accent-yy {
            background: linear-gradient(135deg, #fb923c, #ea6a1a);
            border: none;
            color: #0f172a;
            font-weight: 600;
            border-radius: 60px;
            padding: 0.8rem 2.2rem;
            box-shadow: 0 8px 24px #fb923c40;
        }
        .text-gradient { background: linear-gradient(135deg, #22d3ee, #fb923c); -webkit-background-clip: text; background-clip: text; color: transparent; }
        .bg-soft-card { background: #1e293b; border: 1px solid #2c3a4f; border-radius: var(--yy-radius-lg); }
        hr { border-color: var(--yy-border); opacity: 0.6; }

/* --- 子页面追加 --- */
/* 本页专属微调，仅补充少量页面特有样式 */
        .about-hero {
            background: radial-gradient(circle at 20% 20%, rgba(34,211,238,0.12), transparent 50%),
                        radial-gradient(circle at 80% 30%, rgba(251,146,60,0.08), transparent 60%);
            border-bottom: 1px solid var(--yy-border);
        }
.stat-card {
            background: var(--yy-card-bg);
            border: 1px solid var(--yy-border);
            border-radius: var(--yy-radius-md);
            padding: 1.5rem 1rem;
            text-align: center;
            transition: transform .2s ease;
            height: 100%;
        }
.stat-card:hover {
            transform: translateY(-4px);
            border-color: var(--yy-primary);
            box-shadow: var(--yy-shadow);
        }
.stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--yy-primary);
            line-height: 1.2;
        }
.stat-label {
            color: var(--yy-muted);
            font-size: .9rem;
            letter-spacing: .5px;
            margin-top: .3rem;
        }
.section-break {
            border-top: 1px dashed var(--yy-border);
            opacity: .4;
            margin: 3rem 0;
        }
.principle-icon {
            background: rgba(34,211,238,0.1);
            width: 50px;
            height: 50px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--yy-primary);
            margin-bottom: 1rem;
        }
.highlight-bg {
            background: rgba(251,146,60,0.08);
            border-left: 4px solid var(--yy-accent);
            padding: 1.2rem 1.5rem;
            border-radius: 0 var(--yy-radius-sm) var(--yy-radius-sm) 0;
        }

/* --- 子页面追加 --- */
/* 确保bootstrap组件不出现白底黑字，覆盖为本站深色风格 */
        .card, .card-body, .card-title, .card-text, .card-header, .card-footer,
        .form-control, .form-select, .form-label, .input-group-text,
        .table, .list-group-item, .accordion-item, .accordion-button, .accordion-body,
        .modal-content, .modal-header, .modal-body, .dropdown-menu, .dropdown-item,
        .nav-link, .navbar, .navbar-brand, .btn-light, .btn-outline-* {
            background: var(--yy-card-bg) !important;
            color: var(--yy-text) !important;
            border-color: var(--yy-border) !important;
        }
.form-control::placeholder {
            color: rgba(255,255,255,0.45) !important;
        }
.accordion-button:not(.collapsed) {
            background: var(--yy-card-bg) !important;
            color: var(--yy-primary) !important;
        }
.accordion-button::after {
            filter: invert(1);
        }
.navbar-toggler-icon {
            filter: invert(1);
        }
/* 强化卡片微调 */
        .card {
            border-radius: var(--yy-radius-md);
            box-shadow: var(--yy-shadow);
        }
.list-group-item {
            background: transparent;
        }

/* --- 子页面追加 --- */
.disclaimer-hero {
            background: linear-gradient(135deg, rgba(15,23,42,0.9) 0%, rgba(30,41,59,0.8) 100%), url('https://picsum.photos/1920/600?random=11') center/cover no-repeat;
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
        }
.disclaimer-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(34,211,238,0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
.disclaimer-hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(251,146,60,0.1) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
.disclaimer-section {
            background: var(--yy-card-bg);
            border: 1px solid var(--yy-border);
            border-radius: var(--yy-radius-md);
            padding: 35px 30px;
            margin-bottom: 30px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
.disclaimer-section:hover {
            box-shadow: var(--yy-shadow);
            transform: translateY(-2px);
            border-color: rgba(34,211,238,0.4);
        }
.disclaimer-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(180deg, var(--yy-primary), var(--yy-accent));
            border-radius: 4px 0 0 4px;
            opacity: 0.6;
        }
.disclaimer-section h3 {
            color: var(--yy-primary);
            font-weight: 700;
            margin-bottom: 20px;
            font-size: 1.4rem;
            display: flex;
            align-items: center;
            gap: 12px;
        }
.disclaimer-section h3 i {
            font-size: 1.2rem;
            color: var(--yy-accent);
        }
.disclaimer-section p {
            color: var(--yy-text);
            line-height: 1.8;
            margin-bottom: 15px;
            font-size: 0.95rem;
        }
.disclaimer-section p:last-child {
            margin-bottom: 0;
        }
.disclaimer-section ul {
            list-style: none;
            padding: 0;
            margin: 15px 0;
        }
.disclaimer-section ul li {
            color: var(--yy-text);
            padding: 8px 0 8px 28px;
            position: relative;
            line-height: 1.7;
            font-size: 0.95rem;
        }
.disclaimer-section ul li::before {
            content: '▸';
            position: absolute;
            left: 0;
            color: var(--yy-accent);
            font-size: 1.1rem;
        }
.disclaimer-highlight {
            background: rgba(34,211,238,0.08);
            border-left: 3px solid var(--yy-primary);
            padding: 15px 20px;
            border-radius: 0 var(--yy-radius-sm) var(--yy-radius-sm) 0;
            margin: 20px 0;
        }
.disclaimer-highlight p {
            margin: 0;
            color: var(--yy-text);
            font-size: 0.9rem;
        }
.disclaimer-hero {
                padding: 60px 0 40px;
            }
.disclaimer-section {
                padding: 25px 20px;
            }
.disclaimer-section h3 {
                font-size: 1.2rem;
            }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-header { background:transparent !important; }