/* ============ 全局与基础 ============ */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif;
        }
        :root {
            --primary: #7c3aed;
            --primary-light: #a78bfa;
            --primary-dark: #5b21b6;
            --secondary: #3b82f6;
            --accent: #ec4899;
            --bg: #faf5ff;
            --bg-card: #ffffff;
            --text-dark: #0f172a;
            --text-mid: #475569;
            --text-light: #94a3b8;
            --border: #e2e8f0;
            --shadow: 0 4px 24px rgba(124, 58, 237, 0.08);
            --radius: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --red: #dc2626;
            --green: #16a34a;
        }
        body {
            background: var(--bg);
            color: var(--text-dark);
            line-height: 1.6;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        /* ============ 头部导航 ============ */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.72);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(124, 58, 237, 0.06);
        }
        .nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.8rem 0;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0.8rem 2rem;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--primary-dark);
        }
        .brand svg {
            width: 32px;
            height: 32px;
        }
        .brand span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-links {
            display: flex;
            gap: 2.2rem;
            list-style: none;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-mid);
        }
        .nav-links a {
            transition: var(--transition);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
        }
        .nav-actions {
            display: flex;
            gap: 0.8rem;
            align-items: center;
        }
        .btn-outline {
            padding: 0.5rem 1.2rem;
            border: 1.5px solid var(--border);
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--text-mid);
            transition: var(--transition);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-primary {
            padding: 0.5rem 1.4rem;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.85rem;
            color: #fff;
            transition: var(--transition);
            box-shadow: 0 2px 12px rgba(124, 58, 237, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(124, 58, 237, 0.35);
        }

        /* ============ Hero 区域 ============ */
        .hero {
            padding: 5rem 0 4rem;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(124, 58, 237, 0.08);
            color: var(--primary);
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 1.2rem;
            border: 1px solid rgba(124, 58, 237, 0.12);
        }
        .hero h1 {
            font-size: 3.6rem;
            font-weight: 900;
            line-height: 1.1;
            letter-spacing: -1.5px;
            margin-bottom: 1.2rem;
        }
        .hero h1 .gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero p {
            font-size: 1.15rem;
            color: var(--text-mid);
            max-width: 480px;
            margin-bottom: 2rem;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .hero-actions .btn-primary {
            padding: 0.8rem 2rem;
            font-size: 1rem;
        }
        .hero-actions .btn-outline {
            padding: 0.8rem 2rem;
            font-size: 1rem;
            border-color: var(--border);
        }
        .hero-actions .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        .hero-stats {
            display: flex;
            gap: 2.5rem;
            margin-top: 2.5rem;
            padding-top: 2rem;
            border-top: 1px solid var(--border);
        }
        .hero-stats strong {
            display: block;
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--primary-dark);
        }
        .hero-stats span {
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .hero-visual {
            background: linear-gradient(145deg, #fff, #f5f0ff);
            border-radius: var(--radius);
            padding: 2rem;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }
        .hero-visual::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.06), transparent 70%);
            border-radius: 50%;
        }
        .visual-card {
            background: var(--bg-card);
            border-radius: 12px;
            padding: 1.5rem;
            border: 1px solid var(--border);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
            position: relative;
            z-index: 1;
        }
        .visual-card .row {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--border);
            font-size: 0.9rem;
            color: var(--text-mid);
        }
        .visual-card .row:last-child {
            border-bottom: none;
        }
        .visual-card .dot-green {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #22c55e;
            flex-shrink: 0;
        }
        .visual-card .dot-purple {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
            flex-shrink: 0;
        }
        .visual-card .dot-red {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--red);
            flex-shrink: 0;
        }
        .visual-card .badge {
            background: rgba(124, 58, 237, 0.08);
            color: var(--primary);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 0.1rem 0.5rem;
            border-radius: 12px;
            margin-left: auto;
        }
        .visual-card .badge.danger {
            background: rgba(220, 38, 38, 0.08);
            color: var(--red);
        }
        .visual-card .key {
            font-family: monospace;
            font-size: 0.75rem;
            color: var(--text-light);
            background: var(--bg);
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
        }
        .visual-card .shield {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1rem;
            background: rgba(124, 58, 237, 0.04);
            border-radius: 8px;
            margin-top: 0.8rem;
            font-size: 0.85rem;
            color: var(--primary-dark);
            border: 1px solid rgba(124, 58, 237, 0.08);
        }
        .visual-card .shield svg {
            width: 18px;
            height: 18px;
            fill: var(--primary);
            flex-shrink: 0;
        }

        /* ============ 信任栏 ============ */
        .trust {
            padding: 2rem 0 3rem;
            border-top: 1px solid var(--border);
        }
        .trust-inner {
            display: flex;
            justify-content: space-around;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            color: var(--text-mid);
            font-weight: 500;
            font-size: 0.95rem;
        }
        .trust-item svg {
            width: 20px;
            height: 20px;
            fill: var(--primary);
            opacity: 0.7;
        }

        /* ============ 核心特性 ============ */
        .features {
            padding: 5rem 0;
            background: #fff;
        }
        .section-label {
            text-align: center;
            color: var(--primary);
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 0.5rem;
        }
        .features h2, .comparison h2, .blog h2, .faq h2 {
            text-align: center;
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 1rem;
        }
        .sub {
            text-align: center;
            color: var(--text-mid);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 3rem;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .feature-card {
            background: var(--bg);
            padding: 2rem 1.8rem;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--primary-light);
        }
        .feature-card .icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(124, 58, 237, 0.08), rgba(59, 130, 246, 0.08));
            display: grid;
            place-items: center;
            margin-bottom: 1.2rem;
        }
        .feature-card .icon svg {
            width: 24px;
            height: 24px;
            fill: var(--primary);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }
        .feature-card p {
            color: var(--text-mid);
            font-size: 0.95rem;
        }

        /* ============ 对比表格 ============ */
        .comparison {
            padding: 5rem 0;
            background: #fff;
            border-top: 1px solid var(--border);
        }
        .comparison-table {
            max-width: 900px;
            margin: 2rem auto 1rem;
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
        }
        .compare-row {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }
        .compare-row:last-child {
            border-bottom: none;
        }
        .compare-header {
            background: var(--bg);
            font-weight: 700;
            color: var(--text-dark);
        }
        .compare-cell {
            padding: 1rem 1.5rem;
            font-size: 0.95rem;
            color: var(--text-mid);
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .feature-name {
            font-weight: 600;
            color: var(--text-dark);
            background: #fafafa;
        }
        .compare-safew {
            background: rgba(22, 163, 74, 0.04);
        }
        .compare-telegram {
            background: rgba(220, 38, 38, 0.04);
        }
        .check {
            color: var(--green);
            font-weight: 700;
        }
        .cross {
            color: var(--red);
            font-weight: 700;
        }
        .compare-note {
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 1rem;
        }

        /* ============ 工作原理 ============ */
        .showcase {
            padding: 5rem 0;
            background: var(--bg);
        }
        .showcase .section-label {
            color: var(--primary);
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 0.5rem;
        }
        .showcase h2 {
            font-size: 2.4rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 0.8rem;
            text-align: left;
        }
        .showcase .sub {
            color: var(--text-mid);
            font-size: 1.05rem;
            max-width: 520px;
            margin-bottom: 2.5rem;
            text-align: left;
        }
        .showcase-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .showcase-item {
            background: #fff;
            border-radius: var(--radius);
            padding: 2rem;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .showcase-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow);
        }
        .showcase-item .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-light);
            margin-bottom: 0.2rem;
        }
        .showcase-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }
        .showcase-item p {
            color: var(--text-mid);
            font-size: 0.95rem;
        }

        /* ============ 博客板块 ============ */
        .blog {
            padding: 5rem 0;
            background: #fff;
            border-top: 1px solid var(--border);
        }
        .blog-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 2rem;
        }
        .blog-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 2rem;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .blog-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--primary-light);
        }
        .blog-tag {
            display: inline-block;
            background: rgba(124, 58, 237, 0.08);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            margin-bottom: 1rem;
        }
        .blog-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            line-height: 1.4;
        }
        .blog-card h3 a:hover {
            color: var(--primary);
        }
        .blog-card p {
            color: var(--text-mid);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }
        .blog-link {
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .blog-link:hover {
            color: var(--primary-dark);
        }

        /* ============ FAQ 板块 ============ */
        .faq {
            padding: 5rem 0;
            background: var(--bg);
        }
        .faq-list {
            max-width: 800px;
            margin: 2rem auto 0;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 12px;
            margin-bottom: 1rem;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item summary {
            padding: 1.2rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .faq-item[open] summary::after {
            content: '−';
            transform: rotate(180deg);
        }
        .faq-item p {
            padding: 0 1.5rem 1.2rem;
            color: var(--text-mid);
            font-size: 0.95rem;
        }

        /* ============ CTA 区域 ============ */
        .cta {
            padding: 5rem 0;
            background: linear-gradient(135deg, var(--primary-dark), var(--secondary));
            color: #fff;
            text-align: center;
        }
        .cta h2 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 0.8rem;
        }
        .cta p {
            font-size: 1.1rem;
            opacity: 0.8;
            max-width: 500px;
            margin: 0 auto 2rem;
        }
        .btn-white {
            padding: 0.9rem 2.4rem;
            background: #fff;
            color: var(--primary-dark);
            border-radius: 40px;
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
            display: inline-block;
        }
        .btn-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
        }

        /* ============ 页脚 ============ */
        footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 4rem 0 2rem;
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-brand p {
            margin-top: 0.8rem;
            max-width: 300px;
            color: #64748b;
        }
        .footer-col h4 {
            color: #f1f5f9;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        .footer-col a {
            color: #94a3b8;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary-light);
        }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        /* ============ 页脚下拉工具区（新增） ============ */
        .footer-tools {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin: 2rem 0;
            padding-top: 1.5rem;
            border-top: 1px solid #1e293b;
        }
        .footer-select {
            position: relative;
            display: inline-block;
        }
        .footer-select-btn {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            width: 220px;
            padding: 10px 14px;
            background: rgba(255, 255, 255, 0.05);
            color: #fff;
            border: 1px solid rgba(168, 85, 247, 0.3);
            border-radius: 6px;
            font-size: 13px;
            cursor: pointer;
            transition: var(--transition);
        }
        .footer-select-btn:hover {
            border-color: var(--primary-light);
            background: rgba(124, 58, 237, 0.08);
        }
        .footer-select-btn svg {
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }
        .footer-select.active .footer-select-btn svg {
            transform: rotate(180deg);
        }
        .footer-select-dropdown {
            position: absolute;
            bottom: calc(100% + 8px);
            left: 0;
            width: 100%;
            max-height: 260px;
            overflow-y: auto;
            background: rgba(20, 10, 35, 0.98);
            border: 1px solid rgba(168, 85, 247, 0.3);
            border-radius: 8px;
            padding: 6px 0;
            display: none;
            z-index: 999;
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(8px);
        }
        .footer-select.active .footer-select-dropdown {
            display: block;
        }
        .footer-select-dropdown a {
            display: block;
            padding: 8px 14px;
            color: #b0aac2;
            text-decoration: none;
            font-size: 12px;
            transition: var(--transition);
        }
        .footer-select-dropdown a:hover {
            color: #fff;
            background: rgba(124, 58, 237, 0.15);
        }
        .footer-select-dropdown::-webkit-scrollbar {
            width: 4px;
        }
        .footer-select-dropdown::-webkit-scrollbar-track {
            background: transparent;
        }
        .footer-select-dropdown::-webkit-scrollbar-thumb {
            background: rgba(168, 85, 247, 0.4);
            border-radius: 4px;
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            .hero {
                grid-template-columns: 1fr;
                gap: 2rem;
                text-align: center;
            }
            .hero p {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-stats {
                justify-content: center;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
            .showcase-grid {
                grid-template-columns: 1fr;
            }
            .blog-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .compare-row {
                grid-template-columns: 1fr;
            }
            .compare-cell {
                border-bottom: 1px solid var(--border);
            }
        }
        @media (max-width: 640px) {
            .hero h1 {
                font-size: 2.4rem;
            }
            .features-grid,
            .blog-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
            }
            .hero-stats {
                flex-wrap: wrap;
                gap: 1.5rem;
            }
            .trust-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .container {
                padding: 0 1rem;
            }
            .nav-inner {
                padding: 0.8rem 1rem;
            }
            .comparison-table {
                overflow-x: auto;
            }
            .compare-row {
                min-width: 600px;
            }
            .footer-tools {
                flex-direction: column;
                gap: 1rem;
            }
            .footer-select,
            .footer-select-btn {
                width: 100%;
            }
        }