:root {
            --primary: #0d9488;
            --primary-deep: #0f766e;
            --primary-light: #ccfbf1;
            --accent: #0369a1;
            --accent-light: #e0f2fe;
            --gold: #f59e0b;
            --gold-light: #fef3c7;
            --bg: #f6f8f9;
            --surface: #ffffff;
            --text: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-xl: 20px;
            --radius-lg: 14px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 6px 24px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.08);
            --shadow-gold: 0 4px 20px rgba(245, 158, 11, 0.25);
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.72;
            padding-top: 68px;
            background-image:
                radial-gradient(ellipse at 75% 15%, rgba(13, 148, 136, 0.04) 0%, transparent 55%),
                radial-gradient(ellipse at 20% 80%, rgba(3, 105, 161, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 50%, rgba(245, 158, 11, 0.02) 0%, transparent 60%);
            background-attachment: fixed;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition), background var(--transition);
        }
        a:hover {
            color: var(--primary-deep);
        }

        /* ============ 导航栏 ============ */
        .nav-bar-wrap {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 68px;
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(16px) saturate(130%);
            -webkit-backdrop-filter: blur(16px) saturate(130%);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            z-index: 1000;
            box-shadow: var(--shadow-sm);
        }
        .nav-bar {
            max-width: 1240px;
            height: 100%;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 750;
            font-size: 1.2rem;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .nav-brand img {
            width: 34px;
            height: 34px;
            object-fit: contain;
            border-radius: 8px;
        }
        .nav-brand span {
            background: linear-gradient(135deg, #0d9488 0%, #0369a1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
            align-items: center;
        }
        .nav-links a {
            color: var(--text-secondary);
            font-weight: 520;
            font-size: 0.92rem;
            padding: 0.4rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-links a.active,
        .nav-links a:hover {
            border-bottom-color: var(--primary);
            color: var(--primary);
        }
        .nav-gh-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #1e293b;
            color: #fff !important;
            padding: 0.4rem 1rem !important;
            border-radius: 50px !important;
            border-bottom: none !important;
            font-size: 0.84rem !important;
            font-weight: 600 !important;
            transition: background 0.25s, transform 0.2s !important;
        }
        .nav-gh-btn:hover {
            background: #0f172a !important;
            color: #fff !important;
            transform: translateY(-1px);
            border-bottom: none !important;
        }

        /* ============ 主布局 ============ */
        .main-grid {
            max-width: 1240px;
            margin: 0 auto;
            padding: 2rem 1.5rem 3rem;
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 2rem;
        }
        @media (max-width: 980px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .side-col {
                display: none;
            }
            .nav-links {
                gap: 0.7rem;
                font-size: 0.82rem;
            }
            .nav-gh-btn {
                padding: 0.35rem 0.7rem !important;
                font-size: 0.78rem !important;
                gap: 3px;
            }
        }
        @media (max-width: 640px) {
            .nav-links a {
                font-size: 0.78rem;
            }
            .nav-brand span {
                font-size: 1rem;
            }
            .hero-section {
                padding: 2rem 1rem 1.5rem;
            }
            .hero-section h1 {
                font-size: 1.6rem;
            }
            .platform-row {
                grid-template-columns: 1fr 1fr;
            }
            .verify-flow {
                grid-template-columns: 1fr;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .quick-row {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.5rem;
            }
        }

        /* ============ Hero ============ */
        .hero-section {
            text-align: center;
            padding: 2.8rem 1.5rem 2.2rem;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-md);
            margin-bottom: 2rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(13, 148, 136, 0.07) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(3, 105, 161, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-logo-wrap {
            width: 110px;
            height: 110px;
            margin: 0 auto 1.2rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(13, 148, 136, 0.08) 0%, rgba(3, 105, 161, 0.06) 100%);
            position: relative;
            z-index: 1;
        }
        .hero-logo-wrap img {
            width: 90px;
            height: 90px;
            object-fit: contain;
        }
        .hero-section h1 {
            font-size: 2.3rem;
            margin-bottom: 0.3rem;
            font-weight: 800;
            letter-spacing: -0.6px;
            color: #0c3d3a;
            position: relative;
            z-index: 1;
        }
        .hero-sub {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
            font-weight: 500;
            position: relative;
            z-index: 1;
        }
        .hero-tagline {
            font-size: 0.95rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 1.4rem;
            position: relative;
            z-index: 1;
        }
        .hero-platform-icons {
            display: flex;
            justify-content: center;
            gap: 1.4rem;
            flex-wrap: wrap;
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 1;
        }
        .hero-platform-icons .plat-icon {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            font-size: 0.78rem;
            color: var(--text-muted);
            font-weight: 500;
            transition: transform var(--transition), color var(--transition);
        }
        .hero-platform-icons .plat-icon:hover {
            transform: translateY(-3px);
            color: var(--primary);
        }
        .hero-platform-icons .plat-icon svg {
            width: 28px;
            height: 28px;
            fill: currentColor;
        }
        .hero-cta-row {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 0.7rem 1.8rem;
            border-radius: 50px;
            font-weight: 620;
            font-size: 0.94rem;
            transition: all 0.25s;
            cursor: pointer;
        }
        .btn-primary {
            background: linear-gradient(135deg, #0d9488 0%, #0369a1 100%);
            color: #fff;
            box-shadow: 0 4px 18px rgba(13, 148, 136, 0.3);
        }
        .btn-primary:hover {
            box-shadow: 0 8px 28px rgba(13, 148, 136, 0.45);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline {
            border: 2px solid var(--primary);
            color: var(--primary);
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(13, 148, 136, 0.05);
            color: var(--primary-deep);
        }
        .btn-gold {
            background: var(--gold);
            color: #1e293b;
            box-shadow: var(--shadow-gold);
            font-weight: 650;
        }
        .btn-gold:hover {
            background: #e6890a;
            color: #1e293b;
            transform: translateY(-2px);
        }
        .tg-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: rgba(34, 158, 217, 0.08);
            color: #229ed9;
            padding: 0.45rem 1.2rem;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.88rem;
            transition: background 0.2s;
            position: relative;
            z-index: 1;
            margin-top: 1rem;
        }
        .tg-badge:hover {
            background: rgba(34, 158, 217, 0.16);
            color: #1a8bc0;
        }

        /* ============ 内容卡片区 ============ */
        .content-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 2.2rem 2rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            margin-bottom: 2rem;
        }
        .content-card h2 {
            font-size: 1.45rem;
            margin: 1.8rem 0 0.9rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-light);
            color: #0c3d3a;
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.2px;
        }
        .content-card h2:first-of-type {
            margin-top: 0;
        }
        .content-card h3 {
            font-size: 1.15rem;
            margin: 1.4rem 0 0.7rem;
            color: #334155;
        }
        .content-card p {
            margin-bottom: 1.15rem;
            color: var(--text-secondary);
            text-align: justify;
        }
        .content-card .highlight-box {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 1rem 1.3rem;
            margin: 1.2rem 0;
            font-size: 0.92rem;
            color: #0f766e;
            font-weight: 500;
        }
        .inline-code {
            background: #f1f5f9;
            color: #c2410c;
            padding: 0.14rem 0.4rem;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.88em;
            font-weight: 500;
        }
        .post-img {
            display: block;
            width: 100%;
            height: auto;
            min-height: 220px;
            max-height: 380px;
            background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
            border-radius: var(--radius-md);
            margin: 1.4rem 0;
            border: 1px dashed #cbd5e1;
            object-fit: cover;
            transition: all 0.3s;
        }

        /* ============ 多端平台卡片行 ============ */
        .platform-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .platform-row {
                grid-template-columns: 1fr 1fr;
            }
        }
        .plat-card {
            background: #fafcfc;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.3rem 1rem;
            text-align: center;
            transition: box-shadow var(--transition), transform var(--transition);
            cursor: default;
        }
        .plat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .plat-card .plat-icon-lg {
            font-size: 2.4rem;
            margin-bottom: 0.6rem;
        }
        .plat-card h4 {
            font-size: 1rem;
            color: var(--text);
            margin-bottom: 0.3rem;
            font-weight: 700;
        }
        .plat-card p {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin: 0;
            text-align: center;
            line-height: 1.5;
        }
        .plat-card .plat-ver {
            display: inline-block;
            margin-top: 0.5rem;
            font-size: 0.75rem;
            background: var(--accent-light);
            color: var(--accent);
            padding: 0.2rem 0.6rem;
            border-radius: 20px;
            font-weight: 600;
        }

        /* ============ 安全验证流程 ============ */
        .verify-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0.8rem;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .verify-flow {
                grid-template-columns: 1fr 1fr;
            }
        }
        .verify-step {
            text-align: center;
            padding: 1rem 0.8rem;
            background: #fafcfc;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            position: relative;
        }
        .verify-step .step-num {
            display: inline-block;
            width: 32px;
            height: 32px;
            line-height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, #0d9488, #0369a1);
            color: #fff;
            font-weight: 700;
            font-size: 0.8rem;
            margin-bottom: 0.5rem;
        }
        .verify-step strong {
            display: block;
            font-size: 0.9rem;
            color: var(--text);
            margin-bottom: 0.25rem;
        }
        .verify-step span {
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        /* ============ 特性网格 ============ */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin: 1.3rem 0;
            list-style: none;
        }
        @media (max-width: 640px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
        }
        .feature-item {
            padding: 1.1rem 1.2rem;
            background: #fafcfc;
            border-radius: var(--radius-sm);
            border-left: 4px solid var(--primary);
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: box-shadow var(--transition);
        }
        .feature-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .feature-item strong {
            display: block;
            margin-bottom: 0.3rem;
            color: #1e293b;
            font-size: 0.95rem;
        }

        /* ============ 快速入门 ============ */
        .quick-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
            margin: 1.3rem 0;
        }
        @media (max-width: 640px) {
            .quick-row {
                grid-template-columns: 1fr;
            }
        }
        .quick-step {
            background: #fafcfc;
            border-radius: var(--radius-sm);
            padding: 1.2rem 1rem;
            text-align: center;
            border: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .quick-step:hover {
            box-shadow: var(--shadow-sm);
        }
        .quick-num {
            display: inline-block;
            width: 34px;
            height: 34px;
            line-height: 34px;
            border-radius: 50%;
            background: linear-gradient(135deg, #0d9488, #0369a1);
            color: #fff;
            font-weight: 700;
            font-size: 0.82rem;
            margin-bottom: 0.65rem;
        }
        .quick-step strong {
            display: block;
            margin-bottom: 0.25rem;
            color: #1e293b;
            font-size: 0.9rem;
        }
        .quick-step span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ============ 侧边栏 ============ */
        .side-col {
            position: sticky;
            top: 84px;
            height: fit-content;
        }
        .side-widget {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 1.2rem;
            box-shadow: var(--shadow-sm);
            margin-bottom: 1.2rem;
        }
        .side-widget-highlight {
            border-left: 3px solid var(--gold);
            background: #fffdf7;
        }
        .side-title {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: #0c3d3a;
            border-bottom: 1px solid var(--border-light);
            padding-bottom: 0.45rem;
        }
        .side-list {
            list-style: none;
        }
        .side-list li {
            margin-bottom: 0.6rem;
            font-size: 0.86rem;
        }
        .side-list a {
            color: var(--text-muted);
            display: inline-block;
            transition: color var(--transition), padding-left 0.2s;
        }
        .side-list a:hover {
            color: var(--primary);
            padding-left: 3px;
        }
        .side-community-text {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }

        /* ============ 页脚 ============ */
        footer {
            margin-top: 3rem;
            background: #0f172a;
            color: #94a3b8;
            padding: 2.8rem 1.5rem 1.8rem;
            font-size: 0.87rem;
        }
        .footer-grid {
            max-width: 1140px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-col h4 {
            color: #e2e8f0;
            font-size: 0.95rem;
            margin-bottom: 0.8rem;
            font-weight: 600;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 0.5rem;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.84rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            max-width: 1140px;
            margin: 0 auto;
            padding-top: 1.4rem;
            border-top: 1px solid rgba(148, 163, 184, 0.13);
            text-align: center;
            font-size: 0.8rem;
            color: #64748b;
        }

        /* ============ 信任条 ============ */
        .trust-strip {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1.8rem;
            padding: 1rem 0;
            margin: 1.2rem 0;
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        .trust-strip span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .trust-strip .trust-icon {
            color: var(--primary);
            font-weight: 700;
        }

        /* ============ 版本同步徽章 ============ */
        .sync-badge-row {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            justify-content: center;
            margin: 1rem 0;
        }
        .sync-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: #f0fdf4;
            color: #166534;
            border: 1px solid #bbf7d0;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 550;
        }
        .sync-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: #22c55e;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.4;
            }
        }