:root {
            --accent: #0d9488;
            --accent-hover: #0f766e;
            --accent-light: #f0fdfa;
            --accent-soft: #ccfbf1;
            --accent-glow: rgba(13, 148, 136, 0.22);
            --bg: #f9fafb;
            --surface: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --border-light: #eef2ff;
            --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.035);
            --shadow: 0 8px 24px rgba(0, 0, 0, 0.055);
            --shadow-lg: 0 18px 32px rgba(0, 0, 0, 0.07);
            --radius-sm: 0.75rem;
            --radius: 1.2rem;
            --radius-lg: 2rem;
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --header-bg: #0f172a;
            --header-text: #e2e8f0;
            --hero-gradient: linear-gradient(145deg, #f0fdfa 0%, #f9fafb 35%, #ffffff 100%);
            --cta-gradient: linear-gradient(135deg, #0f172a 0%, #134e4a 45%, #0f766e 100%);
        }

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

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== HEADER ===== */
        header {
            background: var(--header-bg);
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.2);
            backdrop-filter: blur(8px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 0.85rem 0;
            gap: 0.7rem;
        }
        .logo h1 {
            font-size: 1.65rem;
            font-weight: 750;
            letter-spacing: -0.02em;
            white-space: nowrap;
            color: #fff;
        }
        .logo span {
            background: var(--accent);
            font-size: 0.7rem;
            padding: 0.16rem 0.55rem;
            border-radius: 9999px;
            margin-left: 0.35rem;
            vertical-align: middle;
            font-weight: 600;
            letter-spacing: 0.02em;
            color: #fff;
        }
        .nav-links {
            display: flex;
            gap: 1.4rem;
            flex-wrap: wrap;
            list-style: none;
            align-items: center;
        }
        .nav-links a {
            color: var(--header-text);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.92rem;
            transition: color var(--transition);
            position: relative;
            padding: 0.2rem 0;
            white-space: nowrap;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #5eead4;
            border-radius: 2px;
            transition: width var(--transition);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: #5eead4;
        }

        /* ===== HERO ===== */
        .hero {
            background: var(--hero-gradient);
            padding: 3.2rem 0 2.6rem 0;
            border-bottom: 1px solid var(--border);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -70px;
            right: -90px;
            width: 340px;
            height: 340px;
            background: radial-gradient(circle, rgba(13, 148, 136, 0.07) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -40px;
            left: -50px;
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(94, 234, 212, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 2.5rem;
            position: relative;
            z-index: 2;
        }
        .hero-text {
            flex: 1 1 440px;
        }
        .hero-badge {
            display: inline-block;
            background: var(--accent-soft);
            color: #0f766e;
            font-size: 0.82rem;
            font-weight: 600;
            padding: 0.3rem 0.9rem;
            border-radius: 9999px;
            margin-bottom: 0.9rem;
            letter-spacing: 0.02em;
        }
        .hero-text h2 {
            font-size: clamp(1.9rem, 3.8vw, 2.6rem);
            font-weight: 800;
            line-height: 1.16;
            background: linear-gradient(135deg, #0f172a 30%, #0d9488 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.03em;
        }
        .hero-text p {
            font-size: 1.1rem;
            color: #334155;
            margin: 0.9rem 0 1.5rem 0;
            max-width: 92%;
            line-height: 1.6;
        }
        .badge-group {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.7rem 1.7rem;
            border-radius: 2.5rem;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
            cursor: pointer;
            font-size: 0.95rem;
            white-space: nowrap;
            letter-spacing: 0.01em;
            border: none;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px var(--accent-glow);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(13, 148, 136, 0.3);
        }
        .btn-outline {
            border: 1.5px solid var(--accent);
            color: var(--accent);
            background: transparent;
        }
        .btn-outline:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
        }
        .hero-stats {
            flex: 0 0 310px;
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 1.5rem 1.7rem;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
        }
        .stats-item {
            display: flex;
            align-items: center;
            gap: 0.9rem;
            margin-bottom: 0.9rem;
            padding: 0.45rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .stats-item:last-child {
            margin-bottom: 0;
            border-bottom: none;
        }
        .stats-icon {
            font-size: 1.7rem;
            flex-shrink: 0;
        }
        .stats-info h4 {
            font-size: 0.85rem;
            color: #64748b;
            font-weight: 500;
        }
        .stats-info p {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text);
        }

        /* ===== SECTION ===== */
        .section {
            padding: 2.6rem 0;
        }
        .section-title {
            font-size: clamp(1.45rem, 2.8vw, 1.85rem);
            font-weight: 700;
            text-align: center;
            margin-bottom: 0.35rem;
            color: var(--text);
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.93rem;
            margin-bottom: 2rem;
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.4rem;
        }
        .card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: #99f6e4;
        }
        .card-icon {
            font-size: 2rem;
            margin-bottom: 0.7rem;
            display: block;
        }
        .card h3 {
            font-size: 1.22rem;
            margin-bottom: 0.35rem;
            font-weight: 650;
            letter-spacing: -0.01em;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 1rem;
            line-height: 1.5;
        }
        .btn-sm {
            display: inline-block;
            padding: 0.42rem 1.05rem;
            font-size: 0.84rem;
            border-radius: 2rem;
            background: #f1f5f9;
            color: #1e293b;
            text-decoration: none;
            font-weight: 500;
            transition: all var(--transition);
        }
        .btn-sm:hover {
            background: #e2e8f0;
            transform: translateX(2px);
        }
        .btn-sm.accent {
            background: var(--accent);
            color: #fff;
        }
        .btn-sm.accent:hover {
            background: var(--accent-hover);
        }

        /* ===== STEPS ===== */
        .steps-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
            max-width: 900px;
            margin: 0 auto;
            counter-reset: step;
        }
        .step-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 1.6rem 1.3rem;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
            border-color: #99f6e4;
        }
        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-weight: 800;
            font-size: 1.3rem;
            margin-bottom: 0.7rem;
        }
        .step-card h4 {
            font-size: 1.05rem;
            margin-bottom: 0.3rem;
            font-weight: 650;
        }
        .step-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0.7rem;
        }

        /* ===== COMPARE MINI ===== */
        .compare-mini {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            max-width: 950px;
            margin: 0 auto;
        }
        .compare-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 1.3rem 1rem;
            border: 1px solid var(--border-light);
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
            display: block;
        }
        .compare-card:hover {
            box-shadow: var(--shadow);
            border-color: #99f6e4;
            transform: translateY(-3px);
        }
        .compare-card .cc-icon {
            font-size: 2rem;
            margin-bottom: 0.4rem;
        }
        .compare-card h4 {
            font-size: 0.95rem;
            font-weight: 650;
            margin-bottom: 0.15rem;
        }
        .compare-card .cc-sub {
            font-size: 0.78rem;
            color: var(--text-muted);
        }
        .compare-card.recommended {
            border: 2px solid var(--accent);
            position: relative;
            background: #f9fefc;
        }
        .compare-card.recommended::after {
            content: '⭐ 安卓首选';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            font-size: 0.7rem;
            padding: 0.18rem 0.7rem;
            border-radius: 9999px;
            font-weight: 600;
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        /* ===== UPDATE LIST ===== */
        .update-list {
            max-width: 700px;
            margin: 0 auto;
            list-style: none;
            display: grid;
            gap: 0.7rem;
        }
        .update-list li {
            background: var(--surface);
            padding: 1rem 1.3rem;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            font-size: 0.92rem;
            display: flex;
            align-items: flex-start;
            gap: 0.6rem;
            transition: all var(--transition);
        }
        .update-list li:hover {
            border-color: #99f6e4;
            box-shadow: var(--shadow-sm);
        }
        .update-list .ul-icon {
            font-size: 1.1rem;
            flex-shrink: 0;
            margin-top: 1px;
        }

        /* ===== CTA BOTTOM ===== */
        .cta-bottom {
            background: var(--cta-gradient);
            color: #fff;
            text-align: center;
            padding: 2.8rem 1.5rem;
            border-radius: var(--radius-lg);
            margin: 2rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-bottom::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -50px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(94, 234, 212, 0.22) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-bottom h3 {
            font-size: 1.65rem;
            font-weight: 700;
            margin-bottom: 0.55rem;
            position: relative;
            z-index: 2;
        }
        .cta-bottom p {
            color: #cbd5e1;
            margin-bottom: 1.3rem;
            position: relative;
            z-index: 2;
            font-size: 0.98rem;
        }
        .cta-bottom .btn {
            position: relative;
            z-index: 2;
            font-size: 1.05rem;
            padding: 0.8rem 2.2rem;
            background: #fff;
            color: #0f766e;
            font-weight: 700;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }
        .cta-bottom .btn:hover {
            background: #f0fdfa;
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
        }

        /* ===== FOOTER ===== */
        footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 2rem 0;
            margin-top: 1.5rem;
            border-top: 1px solid #1e293b;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.9rem;
        }
        .footer-content a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color var(--transition);
        }
        .footer-content a:hover {
            color: #5eead4;
        }
        .copyright {
            text-align: center;
            padding-top: 1.2rem;
            margin-top: 1rem;
            border-top: 1px solid #1e293b;
            font-size: 0.8rem;
            color: #94a3b8;
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 900px) {
            .compare-mini {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-row {
                grid-template-columns: 1fr;
                max-width: 400px;
            }
        }
        @media (max-width: 768px) {
            .hero-grid {
                flex-direction: column;
                gap: 1.5rem;
            }
            .hero-stats {
                flex: 1 1 auto;
                width: 100%;
            }
            .hero-text h2 {
                font-size: 1.7rem;
            }
            .hero-text p {
                max-width: 100%;
                font-size: 0.98rem;
            }
            .header-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.5rem;
            }
            .nav-links {
                gap: 0.8rem;
                font-size: 0.82rem;
            }
            .badge-group {
                flex-direction: column;
                align-items: flex-start;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .compare-mini {
                grid-template-columns: 1fr 1fr;
            }
            .cta-bottom h3 {
                font-size: 1.3rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 1rem;
            }
            .hero {
                padding: 2rem 0;
            }
            .hero-text h2 {
                font-size: 1.45rem;
            }
            .logo h1 {
                font-size: 1.3rem;
            }
            .btn {
                padding: 0.55rem 1.2rem;
                font-size: 0.88rem;
            }
            .section {
                padding: 1.8rem 0;
            }
            .compare-mini {
                grid-template-columns: 1fr;
                max-width: 280px;
                margin: 0 auto;
            }
            .nav-links {
                gap: 0.55rem;
            }
            .nav-links a {
                font-size: 0.78rem;
            }
        }