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

        :root {
            --primary: #007aff;
            --primary-dark: #0056b3;
            --primary-light: #e8f0fe;
            --primary-soft: #d4e4fc;
            --gray-bg: #f6f8fa;
            --text-main: #1d1d1f;
            --text-secondary: #555;
            --text-muted: #888;
            --border-light: #eef2f6;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02), 0 4px 12px rgba(0, 0, 0, 0.03);
            --shadow-md: 0 8px 24px rgba(0, 122, 255, 0.08), 0 2px 6px rgba(0, 0, 0, 0.02);
            --shadow-lg: 0 16px 40px rgba(0, 122, 255, 0.12), 0 4px 12px rgba(0, 0, 0, 0.04);
            --radius-sm: 12px;
            --radius-md: 18px;
            --radius-lg: 24px;
            --radius-xl: 32px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: #ffffff;
            color: var(--text-main);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 头部 ===== */
        .header {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: saturate(180%) blur(20px);
            -webkit-backdrop-filter: saturate(180%) blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            transition: all 0.2s ease;
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            font-weight: 700;
            font-size: 20px;
            color: var(--text-main);
            letter-spacing: -0.3px;
        }

        .logo svg {
            width: 34px;
            height: 34px;
            border-radius: 10px;
            transition: transform 0.2s;
        }

        .logo:hover svg {
            transform: scale(1.02);
        }

        .logo span {
            color: var(--primary);
        }

        .nav {
            display: flex;
            gap: 6px;
            list-style: none;
            align-items: center;
        }

        .nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 20px;
            transition: all 0.2s ease;
        }

        .nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav a.download-btn {
            background: var(--primary);
            color: #fff;
            padding: 8px 22px;
            font-weight: 600;
            box-shadow: 0 4px 10px rgba(0, 122, 255, 0.2);
        }

        .nav a.download-btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 16px rgba(0, 122, 255, 0.3);
            transform: translateY(-1px);
            color: #fff;
        }

        /* ===== Hero 区域 ===== */
        .hero {
            background: linear-gradient(145deg, #007aff 0%, #0056b3 100%);
            color: #fff;
            padding: 100px 0 110px;
            text-align: center;
            position: relative;
            overflow: hidden;
            isolation: isolate;
        }

        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 25% 40%, rgba(255, 255, 255, 0.12) 0%, transparent 55%),
                radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
            pointer-events: none;
            z-index: 0;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 100%;
            height: 60px;
            background: linear-gradient(to top, #fff, transparent);
            z-index: 1;
            pointer-events: none;
            opacity: 0.15;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            letter-spacing: -1.5px;
            line-height: 1.2;
            margin-bottom: 18px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
        }

        .hero .subtitle {
            font-size: 18px;
            max-width: 680px;
            margin: 0 auto 44px;
            opacity: 0.92;
            line-height: 1.75;
            font-weight: 400;
            text-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
        }

        .download-btns {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .download-btns a {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 15px 38px;
            background: #fff;
            color: var(--primary);
            border-radius: 16px;
            text-decoration: none;
            font-size: 15px;
            font-weight: 700;
            transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.3);
            min-width: 220px;
        }

        .download-btns a:hover {
            transform: translateY(-4px) scale(1.01);
            box-shadow: 0 18px 36px rgba(0, 0, 0, 0.18);
            background: #fff;
            color: var(--primary-dark);
        }

        .download-btns .label {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            line-height: 1.3;
        }

        .download-btns .label small {
            font-size: 12px;
            font-weight: 400;
            opacity: 0.65;
            color: #444;
        }

        .hero .stats {
            display: flex;
            justify-content: center;
            gap: 60px;
            margin-top: 60px;
            flex-wrap: wrap;
        }

        .hero .stats .item {
            text-align: center;
            min-width: 90px;
        }

        .hero .stats .item .num {
            font-size: 32px;
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.2;
        }

        .hero .stats .item .desc {
            font-size: 14px;
            opacity: 0.75;
            margin-top: 4px;
            font-weight: 500;
        }

        /* ===== 通用 Section ===== */
        .section {
            padding: 88px 0;
        }

        .section-gray {
            background: var(--gray-bg);
        }

        .section-title {
            font-size: 34px;
            text-align: center;
            margin-bottom: 12px;
            color: var(--text-main);
            font-weight: 800;
            letter-spacing: -0.8px;
        }

        .section-desc {
            text-align: center;
            color: var(--text-muted);
            font-size: 16px;
            margin-bottom: 56px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }

        /* ===== 功能卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: #fff;
            border-radius: var(--radius-md);
            padding: 34px 26px;
            border: 1px solid var(--border-light);
            transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
            text-align: center;
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }

        .feature-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), #5ac8fa);
            opacity: 0;
            transition: opacity 0.3s;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-soft);
        }

        .feature-card:hover::after {
            opacity: 1;
        }

        .feature-card .ficon {
            font-size: 40px;
            margin-bottom: 16px;
            display: block;
            line-height: 1;
        }

        .feature-card h4 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--text-main);
            font-weight: 700;
            letter-spacing: -0.2px;
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ===== 下载卡片 ===== */
        .download-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }

        .download-card {
            background: linear-gradient(135deg, #eef4ff, #e0ebff);
            border-radius: var(--radius-lg);
            padding: 44px 36px;
            text-align: center;
            border: 1px solid rgba(0, 122, 255, 0.12);
            transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }

        .download-card::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 280px;
            height: 280px;
            background: radial-gradient(circle, rgba(0, 122, 255, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .download-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }

        .download-card .dicon {
            font-size: 56px;
            margin-bottom: 16px;
            display: block;
            line-height: 1;
        }

        .download-card h4 {
            font-size: 22px;
            color: var(--text-main);
            margin-bottom: 6px;
            font-weight: 700;
            letter-spacing: -0.3px;
        }

        .download-card .version {
            font-size: 13px;
            color: var(--primary);
            margin-bottom: 16px;
            font-weight: 600;
            background: rgba(0, 122, 255, 0.08);
            display: inline-block;
            padding: 4px 14px;
            border-radius: 30px;
        }

        .download-card p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 28px;
            line-height: 1.75;
            max-width: 380px;
            margin-left: auto;
            margin-right: auto;
        }

        .download-card .btn {
            display: inline-block;
            padding: 15px 42px;
            background: var(--primary);
            color: #fff;
            border-radius: 14px;
            text-decoration: none;
            font-size: 15px;
            font-weight: 700;
            transition: all 0.3s ease;
            box-shadow: 0 6px 16px rgba(0, 122, 255, 0.25);
            border: none;
            cursor: pointer;
        }

        .download-card .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 122, 255, 0.35);
        }

        /* ===== 关于区域 ===== */
        .about-wrap {
            display: flex;
            gap: 60px;
            align-items: center;
        }

        .about-wrap .text {
            flex: 1;
        }

        .about-wrap .text h3 {
            font-size: 28px;
            color: var(--text-main);
            margin-bottom: 18px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }

        .about-wrap .text p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .about-wrap .text ul {
            list-style: none;
            padding: 0;
        }

        .about-wrap .text ul li {
            font-size: 15px;
            color: var(--text-secondary);
            padding: 8px 0;
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 500;
        }

        .about-wrap .text ul li::before {
            content: '✓';
            color: var(--primary);
            font-weight: 800;
            font-size: 16px;
            background: var(--primary-light);
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .about-wrap .visual {
            flex: 0 0 300px;
            text-align: center;
        }

        .about-wrap .visual .mock {
            width: 260px;
            height: 380px;
            background: linear-gradient(180deg, #e8f0fe, #f0f4ff);
            border-radius: var(--radius-xl);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 88px;
            border: 2px solid var(--primary-soft);
            box-shadow: var(--shadow-md);
            transition: transform 0.3s;
        }

        .about-wrap .visual .mock:hover {
            transform: scale(1.02);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: 22px 28px;
            margin-bottom: 12px;
            background: #fff;
            transition: all 0.25s ease;
            box-shadow: var(--shadow-sm);
        }

        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateX(2px);
        }

        .faq-item h4 {
            font-size: 16px;
            color: var(--text-main);
            margin-bottom: 8px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .faq-item h4::before {
            content: 'Q';
            color: var(--primary);
            font-weight: 800;
            font-size: 14px;
            background: var(--primary-light);
            width: 26px;
            height: 26px;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .faq-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            padding-left: 36px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: #1a1a2e;
            color: #999;
            padding: 40px 0 30px;
            text-align: center;
            font-size: 13px;
        }

        .footer .links {
            display: flex;
            justify-content: center;
            gap: 28px;
            margin-bottom: 18px;
            flex-wrap: wrap;
        }

        .footer .links a {
            color: #aaa;
            text-decoration: none;
            font-size: 13px;
            transition: color 0.2s;
            font-weight: 500;
        }

        .footer .links a:hover {
            color: #5ac8fa;
        }

        .footer p {
            font-size: 12px;
            margin-bottom: 6px;
            opacity: 0.7;
        }

        .footer a[href*="t.me"] {
            color: #B37FEB !important;
            font-weight: 700;
            text-decoration: none;
            transition: opacity 0.2s;
        }

        .footer a[href*="t.me"]:hover {
            opacity: 0.85;
            text-decoration: underline;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 992px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .header .nav {
                display: none;
            }

            .hero {
                padding: 70px 0 80px;
            }

            .hero h1 {
                font-size: 34px;
                letter-spacing: -1px;
            }

            .hero .subtitle {
                font-size: 16px;
                margin-bottom: 32px;
            }

            .download-btns a {
                padding: 14px 24px;
                font-size: 14px;
                min-width: 180px;
            }

            .hero .stats {
                gap: 28px;
                margin-top: 40px;
            }

            .hero .stats .item .num {
                font-size: 24px;
            }

            .section {
                padding: 64px 0;
            }

            .section-title {
                font-size: 26px;
            }

            .features-grid {
                grid-template-columns: 1fr;
            }

            .download-grid {
                grid-template-columns: 1fr;
            }

            .about-wrap {
                flex-direction: column;
                text-align: center;
                gap: 40px;
            }

            .about-wrap .visual {
                flex: none;
                order: -1;
            }

            .about-wrap .text ul li {
                justify-content: center;
            }

            .about-wrap .text ul li::before {
                margin-right: 6px;
            }

            .faq-item p {
                padding-left: 0;
            }

            .about-wrap .text h3 {
                font-size: 24px;
            }

            .download-card {
                padding: 32px 24px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 18px;
            }

            .hero h1 {
                font-size: 28px;
            }

            .hero .stats .item .num {
                font-size: 20px;
            }

            .hero .stats .item .desc {
                font-size: 12px;
            }

            .section-title {
                font-size: 22px;
            }

            .download-btns {
                flex-direction: column;
                align-items: center;
            }

            .download-btns a {
                width: 100%;
                justify-content: center;
            }

            .about-wrap .visual .mock {
                width: 200px;
                height: 300px;
                font-size: 64px;
            }
        }