/* ========================================
           SafeW 接入私有服务器页样式 — 延续深蓝翡翠主题
           ======================================== */
        :root {
            --bg-primary: #0b1120;
            --bg-secondary: #0f1729;
            --bg-card: rgba(15, 23, 42, 0.88);
            --bg-card-hover: rgba(20, 30, 55, 0.95);
            --text-primary: #f0f4f8;
            --text-secondary: #b8c4d0;
            --text-muted: #7a8a9e;
            --accent-primary: #00d4aa;
            --accent-primary-hover: #00e6ba;
            --accent-secondary: #38bdf8;
            --accent-gold: #f5c542;
            --accent-danger: #f87171;
            --border-color: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(0, 212, 170, 0.45);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-card-hover: 0 16px 48px rgba(0, 212, 170, 0.15);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
            --container-width: 1200px;
            --header-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-primary); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }

        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background: var(--accent-primary);
            color: #0b1120;
            border-color: var(--accent-primary);
        }
        .btn-primary:hover {
            background: var(--accent-primary-hover);
            border-color: var(--accent-primary-hover);
            color: #0b1120;
            box-shadow: 0 8px 24px rgba(0, 212, 170, 0.3);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: transparent;
            color: var(--accent-primary);
            border-color: rgba(0, 212, 170, 0.5);
        }
        .btn-secondary:hover {
            background: rgba(0, 212, 170, 0.1);
            border-color: var(--accent-primary);
            color: var(--accent-primary);
            transform: translateY(-2px);
        }
        .btn-sm { padding: 8px 18px; font-size: 0.875rem; border-radius: 8px; }
        .btn-lg { padding: 16px 36px; font-size: 1.1rem; border-radius: var(--radius-lg); }

        /* 头部导航（与首页一致） */
        .site-header {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            background: rgba(11, 17, 32, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .site-header.scrolled {
            background: rgba(11, 17, 32, 0.95);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            gap: 20px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            flex-shrink: 0;
        }
        .logo-link img { width: 40px; height: 40px; border-radius: 8px; }
        .logo-link span {
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .main-nav { display: flex; align-items: center; gap: 8px; }
        .nav-links { display: flex; align-items: center; gap: 4px; }
        .nav-links li a {
            display: block;
            padding: 8px 14px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav-links li a:hover,
        .nav-links li a[aria-current='page'] {
            color: var(--accent-primary);
            background: rgba(0, 212, 170, 0.08);
        }
        .nav-links li a[aria-current='page']::after {
            content: '';
            position: absolute;
            bottom: 2px; left: 50%;
            transform: translateX(-50%);
            width: 20px; height: 2px;
            background: var(--accent-primary);
            border-radius: 2px;
        }
        .nav-cta { margin-left: 8px; flex-shrink: 0; }

        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px; height: 40px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
        }
        .menu-toggle:hover { background: rgba(255,255,255,0.05); }
        .menu-toggle span {
            display: block;
            width: 100%; height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition);
        }
        #nav-checkbox { display: none; }

        @media (max-width: 992px) {
            .menu-toggle { display: flex; }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0; right: 0;
                background: rgba(11,17,32,0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 20px 24px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-120%);
                opacity: 0; visibility: hidden;
                transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
                max-height: calc(100vh - var(--header-height));
                overflow-y: auto;
                gap: 8px;
            }
            #nav-checkbox:checked ~ .main-nav {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav-links { flex-direction: column; gap: 2px; }
            .nav-links li a { padding: 12px 16px; font-size: 1rem; }
            .nav-cta { margin-left: 0; margin-top: 12px; text-align: center; }
            .nav-cta .btn { width: 100%; }
        }

        /* 区块通用 */
        .section { padding: 80px 0; }
        .section + .section { padding-top: 40px; }
        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }
        .section-tag {
            display: inline-block;
            color: var(--accent-primary);
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 12px;
            background: rgba(0, 212, 170, 0.08);
            padding: 4px 14px;
            border-radius: 100px;
        }
        .section-header h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }
        .section-header p { color: var(--text-secondary); font-size: 1.05rem; }
        .gradient-text {
            background: linear-gradient(135deg, #00d4aa 0%, #38bdf8 50%, #f5c542 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* ========== Hero区域 ========== */
        .hero-private {
            position: relative;
            padding: calc(var(--header-height) + 60px) 0 80px;
            background: linear-gradient(155deg, #0b1120 0%, #0d1f2e 30%, #0e2038 60%, #0b1120 100%);
            overflow: hidden;
            min-height: 75vh;
            display: flex;
            align-items: center;
        }
        .hero-private::before {
            content: '';
            position: absolute;
            top: -20%; right: -5%;
            width: 500px; height: 500px;
            background: radial-gradient(circle, rgba(0,212,170,0.12) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-private::after {
            content: '';
            position: absolute;
            bottom: -30%; left: -10%;
            width: 600px; height: 600px;
            background: radial-gradient(circle, rgba(56,189,248,0.08) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-private .container { position: relative; z-index: 1; }
        .hero-private .hero-content {
            max-width: 850px;
            margin: 0 auto;
            text-align: center;
        }
        .hero-private .badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0,212,170,0.1);
            border: 1px solid rgba(0,212,170,0.25);
            color: var(--accent-primary);
            padding: 8px 20px;
            border-radius: 100px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 0.02em;
        }
        .hero-private h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 24px;
        }
        .hero-private .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-private .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== 安全机制双保险（卡片） ========== */
        .dual-security-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
            max-width: 900px;
            margin: 0 auto;
        }
        .security-pillar {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-xl);
            padding: 36px 28px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .security-pillar:hover {
            border-color: var(--border-hover);
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
        }
        .security-pillar .pillar-icon {
            font-size: 3rem;
            margin-bottom: 16px;
        }
        .security-pillar h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .security-pillar p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .security-pillar .pillar-badge {
            position: absolute;
            top: 16px;
            right: -35px;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #0b1120;
            padding: 4px 40px;
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            transform: rotate(45deg);
        }

        /* ========== 接入步骤（创意时间线） ========== */
        .steps-timeline {
            max-width: 700px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 20px;
            position: relative;
        }
        .steps-timeline::before {
            content: '';
            position: absolute;
            left: 24px;
            top: 0; bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary), var(--accent-gold));
            opacity: 0.4;
        }
        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding-left: 12px;
            position: relative;
        }
        .step-item .step-number {
            flex-shrink: 0;
            width: 40px; height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
            color: #0b1120;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            z-index: 1;
            box-shadow: 0 4px 16px rgba(0,212,170,0.35);
        }
        .step-item .step-content {
            flex: 1;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: all var(--transition);
        }
        .step-item .step-content:hover {
            border-color: var(--border-hover);
            background: var(--bg-card-hover);
        }
        .step-item .step-content h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-item .step-content p {
            color: var(--text-muted);
            font-size: 0.85rem;
            line-height: 1.6;
        }

        /* ========== 配置检查清单 ========== */
        .checklist-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            max-width: 900px;
            margin: 0 auto;
        }
        .checklist-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px 18px;
            text-align: center;
            transition: all var(--transition);
        }
        .checklist-item:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
        }
        .checklist-item .check-icon {
            font-size: 1.8rem;
            margin-bottom: 8px;
        }
        .checklist-item .check-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            font-weight: 600;
        }

        /* ========== 对比表格 ========== */
        .compare-wrapper {
            max-width: 900px;
            margin: 0 auto;
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--bg-card);
            min-width: 600px;
        }
        .compare-table th,
        .compare-table td {
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
        }
        .compare-table th {
            background: rgba(0,212,170,0.06);
            font-weight: 700;
            color: var(--accent-primary);
            letter-spacing: 0.03em;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .compare-table td:first-child {
            font-weight: 600;
            color: var(--text-primary);
        }
        .compare-table td {
            color: var(--text-secondary);
        }
        .compare-check { color: var(--accent-primary); font-weight: 700; }
        .compare-cross { color: var(--accent-danger); font-weight: 700; }

        /* FAQ */
        .faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: rgba(0,212,170,0.3); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            gap: 16px;
            user-select: none;
        }
        .faq-question .faq-icon {
            font-size: 1.2rem;
            color: var(--accent-primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
            padding: 0 24px;
        }
        .faq-answer p { color: var(--text-secondary); font-size: 0.9rem; padding-bottom: 18px; line-height: 1.7; }
        .faq-item input[type='checkbox'] { display: none; }
        .faq-item input[type='checkbox']:checked ~ .faq-answer { max-height: 300px; }
        .faq-item input[type='checkbox']:checked ~ .faq-question .faq-icon { transform: rotate(45deg); }

        /* CTA区域 */
        .cta-section { padding: 60px 0; }
        .cta-box {
            background: linear-gradient(135deg, #0f1b2e 0%, #0b1120 60%, #1a0f2e 100%);
            border: 1px solid rgba(0,212,170,0.3);
            border-radius: var(--radius-xl);
            padding: 56px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%; right: -20%;
            width: 400px; height: 400px;
            background: radial-gradient(circle, rgba(0,212,170,0.15) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cta-box h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-box p { color: var(--text-secondary); margin-bottom: 28px; position: relative; z-index: 1; }
        .cta-box .btn { position: relative; z-index: 1; }

        /* 页脚（与首页一致） */
        .site-footer {
            background: #080c16;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin-top: 12px; max-width: 280px; }
        .footer-col h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); letter-spacing: 0.02em; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: var(--text-muted); font-size: 0.9rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--accent-primary); }
        .friend-links {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            margin-bottom: 24px;
        }
        .friend-links h3 { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; margin-bottom: 12px; letter-spacing: 0.04em; }
        .friend-links-list { display: flex; gap: 16px; flex-wrap: wrap; }
        .friend-links-list a {
            color: var(--text-muted);
            font-size: 0.85rem;
            padding: 6px 12px;
            border-radius: 6px;
            background: rgba(255,255,255,0.03);
            transition: all var(--transition);
        }
        .friend-links-list a:hover { color: var(--accent-primary); background: rgba(0,212,170,0.08); }
        .copyright {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }

        /* 响应式 */
        @media (max-width: 992px) {
            .dual-security-grid { grid-template-columns: 1fr; gap: 20px; }
            .checklist-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
        }
        @media (max-width: 768px) {
            .hero-private { min-height: auto; padding: calc(var(--header-height) + 40px) 0 60px; }
            .section { padding: 50px 0; }
            .checklist-grid { grid-template-columns: 1fr; gap: 12px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .cta-box { padding: 36px 20px; }
            .steps-timeline::before { left: 12px; }
            .step-item { padding-left: 0; gap: 12px; }
            .step-item .step-number { width: 32px; height: 32px; font-size: 0.9rem; }
        }
        @media (max-width: 480px) {
            .hero-private .hero-actions { flex-direction: column; align-items: center; }
            .hero-private .hero-actions .btn { width: 100%; max-width: 320px; }
        }
        .visually-hidden {
            position: absolute;
            width: 1px; height: 1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border: 0;
        }