:root {
            --main: #64748b;
            --accent: #94a3b8;
            --bg: #f1f5f9;
            --text: #1e293b;
            --card-radius: 1.2rem;
            --shadow-sm: 0 8px 20px rgba(100, 116, 139, 0.08);
            --shadow-hover: 0 12px 28px rgba(100, 116, 139, 0.18);
        }

        * { box-sizing: border-box; }

        body {
            background-color: var(--bg);
            color: var(--text);
            font-family: 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.7;
            scroll-behavior: smooth;
        }

        h1, h2, h3, .serif-title {
            font-family: 'Noto Serif SC', serif;
            font-weight: 700;
            letter-spacing: 0.02em;
        }

        /* 滚动进度条 */
        #scroll-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 4px;
            width: 0%;
            background: linear-gradient(90deg, var(--main), var(--accent));
            z-index: 9999;
            border-radius: 2px;
            transition: width 0.1s ease;
        }

        /* 导航 */
        .navbar-ya {
            background: rgba(241, 245, 249, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(100, 116, 139, 0.15);
            padding: 0.8rem 0;
        }
        .navbar-brand {
            font-family: 'Noto Serif SC', serif;
            font-weight: 700;
            font-size: 1.7rem;
            color: var(--main) !important;
            letter-spacing: 1px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .navbar-brand i {
            font-size: 1.8rem;
            color: var(--main);
        }
        .nav-link {
            color: var(--text) !important;
            font-weight: 500;
            margin: 0 0.2rem;
            border-radius: 40px;
            padding: 0.5rem 1.2rem !important;
            transition: 0.2s;
        }
        .nav-link:hover {
            background: rgba(100, 116, 139, 0.1);
            color: var(--main) !important;
        }
        .navbar-toggler {
            border: none;
            color: var(--main);
            font-size: 1.4rem;
        }

        /* Hero */
        .hero-section {
            min-height: 88vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 5rem 0 3rem;
            background: radial-gradient(circle at 20% 20%, #e2e8f0 0%, transparent 60%),
                        radial-gradient(circle at 80% 70%, #cbd5e1 0%, transparent 50%);
            position: relative;
            overflow: hidden;
        }
        .hero-title {
            font-size: 3.6rem;
            font-weight: 900;
            background: linear-gradient(145deg, var(--main), #334155 60%, var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.3;
        }
        .hero-sub {
            font-size: 1.2rem;
            color: #475569;
            margin-top: 1.2rem;
            max-width: 600px;
            margin-inline: auto;
            font-weight: 300;
        }
        .hero-cta .btn {
            padding: 0.8rem 2.5rem;
            border-radius: 60px;
            font-weight: 600;
            background: var(--main);
            color: white;
            border: none;
            box-shadow: var(--shadow-sm);
            transition: 0.3s;
            position: relative;
            overflow: hidden;
        }
        .btn-glow::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(120deg, transparent, rgba(255,255,255,0.3), transparent);
            transition: 0.6s;
        }
        .btn-glow:hover::after {
            left: 100%;
        }
        .btn-glow:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px rgba(100,116,139,0.3);
            background: #556b86;
        }
        /* 浮动装饰 */
        .float-deco {
            position: absolute;
            border-radius: 40px;
            background: rgba(100, 116, 139, 0.08);
            animation: float 8s infinite ease-in-out;
        }
        .float-deco.one { width: 120px; height: 120px; top: 10%; left: 8%; }
        .float-deco.two { width: 80px; height: 80px; bottom: 15%; right: 12%; animation-delay: 2s; background: rgba(148, 163, 178, 0.2); }
        @keyframes float {
            0%,100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(5deg); }
        }

        /* 区块通用 */
        .section-padding { padding: 5rem 0; }
        .section-subtitle {
            color: var(--main);
            font-weight: 600;
            letter-spacing: 2px;
            margin-bottom: 0.5rem;
        }
        .section-title {
            font-size: 2.2rem;
            margin-bottom: 1.5rem;
        }

        /* 特色卡片 */
        .feature-card {
            background: white;
            border-radius: var(--card-radius);
            padding: 2rem 1.8rem;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
            border: 1px solid rgba(148, 163, 184, 0.1);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--main);
            margin-bottom: 1.2rem;
        }
        .feature-card h5 {
            font-weight: 700;
            margin-bottom: 0.8rem;
            font-size: 1.2rem;
        }

        /* FAQ 折叠 */
        .faq-item {
            background: white;
            border-radius: 20px;
            padding: 1.2rem 1.8rem;
            box-shadow: var(--shadow-sm);
            border: none;
            margin-bottom: 1rem;
        }
        .accordion-button {
            background: transparent;
            font-weight: 600;
            color: var(--text);
            font-size: 1.1rem;
            padding: 0.8rem 0;
            border: none;
            box-shadow: none;
        }
        .accordion-button:not(.collapsed) {
            color: var(--main);
            background: transparent;
            box-shadow: none;
        }
        .accordion-button::after {
            color: var(--main);
        }

        /* 介绍区 步骤条 */
        .steps-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
        }
        .step-item {
            background: white;
            border-radius: 40px;
            padding: 1.8rem 1.2rem;
            box-shadow: var(--shadow-sm);
            flex: 1 1 180px;
            text-align: center;
            transition: 0.3s;
            border: 1px solid rgba(100,116,139,0.05);
        }
        .step-num {
            width: 45px;
            height: 45px;
            background: var(--main);
            color: white;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            box-shadow: 0 8px 16px rgba(100,116,139,0.2);
        }
        .step-item:hover { transform: scale(1.02); background: #ffffff; }

        /* CTA */
        .cta-section {
            background: linear-gradient(145deg, #e2e8f0, #f8fafc);
            border-radius: 60px;
            padding: 4rem 2rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .cta-section h2 { font-size: 2rem; }

        /* 友链 */
        .friend-links {
            background: white;
            border-radius: 40px;
            padding: 2rem 2.5rem;
            margin-top: 3rem;
            box-shadow: var(--shadow-sm);
        }
        .friend-links .fl-item {
            background: #f1f5f9;
            padding: 0.4rem 1.2rem;
            border-radius: 30px;
            margin: 0.2rem 0.4rem;
            display: inline-block;
            color: var(--main);
        }

        /* 回到顶部 */
        #back-to-top {
            position: fixed;
            bottom: 2.5rem;
            right: 2.5rem;
            width: 50px;
            height: 50px;
            background: var(--main);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            opacity: 0;
            visibility: hidden;
            transition: 0.4s;
            box-shadow: 0 8px 20px rgba(100,116,139,0.4);
            border: none;
            z-index: 999;
        }
        #back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        #back-to-top:hover { background: #556b86; transform: translateY(-3px); }

        footer {
            background: #e2e8f0;
            padding: 2.5rem 0;
            margin-top: 4rem;
            border-radius: 40px 40px 0 0;
            color: var(--text);
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .hero-title { font-size: 2.5rem; }
            .section-title { font-size: 1.8rem; }
            .navbar-collapse { background: rgba(241,245,249,0.98); padding: 1rem; border-radius: 20px; }
        }

/* --- 子页面追加 --- */
/* 本页专属微调 */
        .about-hero {
            background: linear-gradient(135deg, rgba(100, 116, 139, 0.08) 0%, rgba(148, 163, 184, 0.12) 100%);
            border-bottom: 1px solid rgba(100, 116, 139, 0.15);
        }
.about-hero .hero-title {
            color: var(--text);
            font-weight: 800;
        }
.about-section {
            padding: 3.5rem 0;
        }
.about-section .section-subtitle {
            color: var(--main);
            font-weight: 600;
        }
.about-section .section-title {
            color: var(--text);
            font-weight: 800;
        }
.value-card {
            background: rgba(255, 255, 255, 0.75);
            border-radius: var(--card-radius);
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            height: 100%;
            border: 1px solid rgba(100, 116, 139, 0.1);
            backdrop-filter: blur(4px);
        }
.value-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
.value-card .feature-icon {
            background: rgba(100, 116, 139, 0.12);
            color: var(--main);
            width: 3.5rem;
            height: 3.5rem;
            border-radius: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1.25rem;
        }
.value-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.75rem;
        }
.value-card p {
            font-size: 0.95rem;
            color: #475569;
            line-height: 1.7;
            margin-bottom: 0;
        }
.story-block {
            background: rgba(255, 255, 255, 0.6);
            border-radius: var(--card-radius);
            padding: 2rem 2rem;
            box-shadow: var(--shadow-sm);
            border-left: 4px solid var(--accent);
        }
.story-block p {
            color: #334155;
            line-height: 1.85;
            margin-bottom: 1rem;
        }
.story-block p:last-child {
            margin-bottom: 0;
        }
.steps-wrapper .step-item {
            background: rgba(255, 255, 255, 0.6);
            border-radius: var(--card-radius);
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow-sm);
            position: relative;
            transition: transform 0.2s ease;
        }
.steps-wrapper .step-item:hover {
            transform: translateY(-4px);
        }
.steps-wrapper .step-num {
            background: var(--main);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 0.75rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
        }
.steps-wrapper h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.6rem;
        }
.steps-wrapper p {
            color: #475569;
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 0;
        }
.quote-block {
            background: rgba(100, 116, 139, 0.06);
            border-radius: var(--card-radius);
            padding: 2rem 2.5rem;
            text-align: center;
            border: 1px dashed rgba(100, 116, 139, 0.25);
        }
.quote-block i {
            color: var(--accent);
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
.quote-block p {
            font-size: 1.1rem;
            color: var(--text);
            font-weight: 500;
            font-style: italic;
            line-height: 1.8;
            margin-bottom: 0.75rem;
        }
.quote-block span {
            color: var(--main);
            font-size: 0.9rem;
            font-weight: 600;
        }
.about-section {
                padding: 2.5rem 0;
            }
.story-block {
                padding: 1.5rem;
            }
.quote-block {
                padding: 1.5rem 1.25rem;
            }

/* --- 子页面追加 --- */
.legal-page { max-width: 900px; margin: 0 auto; }
.legal-card {
            background: #ffffff;
            border-radius: var(--card-radius);
            box-shadow: var(--shadow-sm);
            padding: 2.5rem;
            margin-bottom: 2rem;
            border-left: 4px solid var(--main);
            transition: box-shadow 0.3s ease;
        }
.legal-card:hover {
            box-shadow: var(--shadow-hover);
        }
.legal-card h2 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
.legal-card h2 i {
            color: var(--main);
            font-size: 1.2rem;
        }
.legal-card p, .legal-card li {
            color: #475569;
            line-height: 1.9;
            font-size: 0.95rem;
        }
.legal-card ul {
            padding-left: 1.2rem;
            margin-bottom: 1rem;
        }
.legal-card li {
            margin-bottom: 0.5rem;
        }
.highlight-box {
            background: rgba(100, 116, 139, 0.08);
            border-radius: 0.8rem;
            padding: 1.2rem 1.5rem;
            margin: 1.2rem 0;
            border: 1px solid rgba(100, 116, 139, 0.15);
        }
.highlight-box p {
            margin-bottom: 0.3rem;
            color: var(--text);
        }
.update-date {
            display: inline-block;
            background: var(--main);
            color: #fff;
            font-size: 0.8rem;
            padding: 0.3rem 0.9rem;
            border-radius: 2rem;
            margin-bottom: 1.5rem;
            font-weight: 500;
        }
.legal-card {
                padding: 1.5rem;
            }
.legal-card h2 {
                font-size: 1.2rem;
            }

/* --- 子页面追加 --- */
/* 本页专属样式 */
        .privacy-section {
            padding: 4rem 0;
        }
.privacy-card {
            background: #ffffff;
            border-radius: var(--card-radius);
            box-shadow: var(--shadow-sm);
            padding: 2.5rem;
            margin-bottom: 2rem;
            border: 1px solid rgba(100, 116, 139, 0.1);
        }
.privacy-card h2 {
            color: var(--main);
            font-weight: 700;
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            position: relative;
            padding-left: 1.2rem;
        }
.privacy-card h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.3rem;
            width: 4px;
            height: 1.6rem;
            background: var(--accent);
            border-radius: 2px;
        }
.privacy-card p {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 1rem;
        }
.privacy-card ul {
            color: var(--text);
            line-height: 1.8;
            padding-left: 1.5rem;
        }
.privacy-card ul li {
            margin-bottom: 0.5rem;
        }
.privacy-card .highlight-box {
            background: rgba(100, 116, 139, 0.05);
            border-left: 4px solid var(--main);
            padding: 1.2rem 1.5rem;
            border-radius: 0.8rem;
            margin: 1.5rem 0;
        }
.privacy-card .highlight-box p {
            margin-bottom: 0;
        }
.privacy-card .contact-info {
            background: rgba(148, 163, 184, 0.08);
            border-radius: 0.8rem;
            padding: 1.5rem;
            margin-top: 1.5rem;
        }
.privacy-card .contact-info p {
            margin-bottom: 0.5rem;
        }
.privacy-card .contact-info i {
            color: var(--main);
            margin-right: 0.5rem;
        }
.privacy-card .last-updated {
            display: inline-block;
            background: var(--bg);
            color: var(--main);
            padding: 0.3rem 1rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
        }
.privacy-card {
                padding: 1.8rem;
            }
.privacy-card h2 {
                font-size: 1.3rem;
            }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-body { background:transparent !important; color:#1e293b !important; }
.accordion-header { background:transparent !important; }