/* ==================== 全局样式 ==================== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --primary-light: #818cf8;
            --secondary: #ec4899;
            --accent: #f59e0b;
            --success: #10b981;
            --danger: #ef4444;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border: #e5e7eb;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', Trebuchet MS, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        a:hover {
            color: var(--primary-dark);
        }

        button {
            border: none;
            cursor: pointer;
            font-size: 16px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-family: inherit;
        }

        /* ==================== 头部导航 ==================== */
        header {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(249, 250, 251, 0.95) 100%);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(229, 231, 235, 0.5);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-md);
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 0;
        }

        .logo {
            font-size: 26px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }

        .logo::before {
            content: "🚀";
            font-size: 32px;
            -webkit-text-fill-color: unset;
            background: unset;
        }

        nav {
            display: flex;
            gap: 35px;
            align-items: center;
        }

        nav a {
            color: var(--text-dark);
            font-weight: 600;
            font-size: 15px;
            position: relative;
            letter-spacing: 0.3px;
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        nav a:hover::after {
            width: 100%;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        /* ==================== 语言下拉菜单 ==================== */
        .lang-dropdown {
            position: relative;
        }

        .lang-trigger {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 14px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            border-radius: 8px;
            font-weight: 600;
            font-size: 13px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .lang-trigger:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .lang-trigger::after {
            content: '▼';
            font-size: 10px;
            transition: transform 0.3s ease;
        }

        .lang-dropdown.active .lang-trigger::after {
            transform: rotate(180deg);
        }

        .lang-menu {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: 8px;
            background: var(--bg-white);
            border-radius: 12px;
            box-shadow: var(--shadow-xl);
            min-width: 180px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s ease;
            z-index: 1000;
            overflow: hidden;
        }

        .lang-dropdown.active .lang-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .lang-item {
            padding: 12px 16px;
            color: var(--text-dark);
            font-weight: 500;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 8px;
            border-left: 3px solid transparent;
        }

        .lang-item:hover {
            background: var(--bg-light);
            padding-left: 20px;
        }

        .lang-item.active {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
            color: var(--primary);
            border-left-color: var(--primary);
            font-weight: 700;
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            background: none;
            padding: 8px;
        }

        .menu-toggle span {
            width: 26px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(10px, 10px);
        }

        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -7px);
        }

/* ==================== 侧边菜单 ==================== */
.side-menu {
    position: fixed;
    right: -100%;
    top: 0;
    width: 100%;
    max-width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.15);
    z-index: 200;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.side-menu.active {
    right: 0;
}

.side-menu nav {
    flex-direction: column;
    gap: 0;
    padding: 0;
    flex: 1;
    overflow-y: auto;
    padding-top: 20px;
}

.side-menu nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border-bottom: 1px solid rgba(229, 231, 235, 0.3);
    color: var(--text-dark);
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    position: relative;
}

.side-menu nav a::before {
    content: '→';
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.side-menu nav a:hover {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.05) 0%, rgba(236, 72, 153, 0.05) 100%);
    padding-left: 28px;
    color: var(--primary);
}

.side-menu nav a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.side-menu-lang {
    padding: 20px;
    border-top: 2px solid rgba(99, 102, 241, 0.1);
    margin-top: auto;
    flex-shrink: 0;
}

.side-menu-lang-title {
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.side-menu .lang-dropdown {
    position: relative;
}

.side-menu .lang-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 12px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 8px;
    font-weight: 600;
    font-size: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.side-menu .lang-trigger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.side-menu .lang-trigger::after {
    content: '▼';
    font-size: 9px;
    transition: transform 0.3s ease;
}

.side-menu .lang-dropdown.active .lang-trigger::after {
    transform: rotate(180deg);
}

.side-menu .lang-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 6px;
    background: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s ease;
    z-index: 1000;
    overflow: hidden;
    max-height: 250px;
    overflow-y: auto;
}

.side-menu .lang-dropdown.active .lang-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.side-menu .lang-item {
    padding: 10px 12px;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    border-left: 3px solid transparent;
}

.side-menu .lang-item:hover {
    background: var(--bg-light);
    padding-left: 16px;
}

.side-menu .lang-item.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 700;
}

.menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 150;
    backdrop-filter: blur(4px);
}

.menu-overlay.active {
    display: block;
}


        /* ==================== 英雄区域 ==================== */
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--secondary) 100%);
            color: white;
            padding: 120px 0;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            animation: float 6s ease-in-out infinite;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            animation: float 8s ease-in-out infinite reverse;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(30px); }
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: 56px;
            margin-bottom: 24px;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 18px;
            margin-bottom: 40px;
            opacity: 0.95;
            max-width: 600px;
            line-height: 1.8;
            font-weight: 300;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            padding: 16px 36px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 700;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: inline-block;
            letter-spacing: 0.5px;
            box-shadow: var(--shadow-md);
        }

        .btn-primary {
            background: linear-gradient(135deg, #ffffff 0%, #f3f4f6 100%);
            color: var(--primary);
            box-shadow: 0 10px 30px rgba(255, 255, 255, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-4px);
            box-shadow: 0 15px 40px rgba(255, 255, 255, 0.4);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.15);
            color: white;
            border: 2px solid rgba(255, 255, 255, 0.3);
            backdrop-filter: blur(10px);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.25);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-4px);
        }

        /* ==================== 核心功能区 ==================== */
        .features {
            padding: 100px 0;
            background: var(--bg-white);
            position: relative;
        }

        .features::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent 0%, var(--border) 50%, transparent 100%);
        }

        .section-title {
            text-align: center;
            font-size: 42px;
            margin-bottom: 60px;
            color: var(--text-dark);
            font-weight: 800;
            letter-spacing: -1px;
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            margin: 20px auto 0;
            border-radius: 2px;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .feature-card {
            background: linear-gradient(135deg, var(--bg-light) 0%, rgba(99, 102, 241, 0.05) 100%);
            padding: 40px;
            border-radius: 16px;
            text-align: center;
            border: 1px solid rgba(99, 102, 241, 0.1);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-12px);
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
            border-color: rgba(99, 102, 241, 0.2);
            box-shadow: var(--shadow-xl);
        }

        .feature-card:hover::before {
            transform: scaleX(1);
        }

        .feature-icon {
            font-size: 56px;
            margin-bottom: 20px;
            display: inline-block;
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

        .feature-card h3 {
            font-size: 22px;
            margin-bottom: 14px;
            color: var(--text-dark);
            font-weight: 700;
        }

        .feature-card p {
            color: var(--text-light);
            line-height: 1.8;
            font-size: 15px;
        }

        /* ==================== 适用场景 ==================== */
        .scenarios {
            padding: 100px 0;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(236, 72, 153, 0.03) 100%);
        }

        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .scenario-item {
            background: var(--bg-white);
            padding: 32px;
            border-radius: 14px;
            border-left: 5px solid var(--primary);
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
            position: relative;
        }

        .scenario-item::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            opacity: 0;
            transition: all 0.3s ease;
        }

        .scenario-item:hover {
            transform: translateX(8px);
            box-shadow: var(--shadow-lg);
            border-left-color: var(--secondary);
        }

        .scenario-item:hover::after {
            opacity: 1;
        }

        .scenario-item h4 {
            color: var(--primary);
            margin-bottom: 12px;
            font-size: 20px;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }

        .scenario-item p {
            color: var(--text-light);
            font-size: 15px;
            position: relative;
            z-index: 1;
        }

        /* ==================== 下载模块 ==================== */
        .download-section {
            background: var(--bg-white);
            padding: 100px 0;
            position: relative;
        }

        .download-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent 0%, var(--border) 50%, transparent 100%);
        }

        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }

        .download-card {
            background: var(--bg-white);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid var(--border);
        }

        .download-card:hover {
            transform: translateY(-12px);
            box-shadow: var(--shadow-xl);
        }

        .download-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 28px 20px;
            text-align: center;
            font-size: 28px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }

        .download-body {
            padding: 32px;
        }

        .download-buttons {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .download-btn {
            padding: 14px 20px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            border-radius: 10px;
            font-weight: 700;
            text-align: center;
            transition: all 0.3s ease;
            display: block;
            font-size: 15px;
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
        }

        .download-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.2);
            transition: left 0.3s ease;
        }

        .download-btn:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        .download-btn:hover::before {
            left: 100%;
        }

        .download-source {
            font-size: 12px;
            color: var(--text-light);
            margin-top: 8px;
            font-weight: 500;
        }

        .download-info {
            margin-top: 18px;
            padding-top: 18px;
            border-top: 1px solid var(--border);
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.8;
        }

        .download-info strong {
            color: var(--primary);
        }

        /* ==================== 系统要求 ==================== */
        .requirements {
            padding: 100px 0;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(236, 72, 153, 0.03) 100%);
        }

        .requirements-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .requirement-card {
            background: var(--bg-white);
            padding: 36px;
            border-radius: 14px;
            border-top: 5px solid var(--primary);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .requirement-card:nth-child(2) {
            border-top-color: var(--secondary);
        }

        .requirement-card:nth-child(3) {
            border-top-color: var(--accent);
        }

        .requirement-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }

        .requirement-card h3 {
            color: var(--primary);
            margin-bottom: 18px;
            font-size: 22px;
            font-weight: 700;
        }

        .requirement-card:nth-child(2) h3 {
            color: var(--secondary);
        }

        .requirement-card:nth-child(3) h3 {
            color: var(--accent);
        }

        .requirement-card ul {
            list-style: none;
        }

        .requirement-card li {
            padding: 10px 0;
            color: var(--text-light);
            position: relative;
            padding-left: 24px;
            font-size: 15px;
            transition: all 0.3s ease;
        }

        .requirement-card li:hover {
            color: var(--text-dark);
            padding-left: 32px;
        }

        .requirement-card li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: bold;
            font-size: 18px;
        }

        /* ==================== 常见问题 ==================== */
        .faq {
            padding: 100px 0;
            background: var(--bg-white);
        }

        .faq-container {
            max-width: 850px;
            margin: 0 auto;
        }

        .faq-item {
            background: linear-gradient(135deg, var(--bg-light) 0%, rgba(99, 102, 241, 0.05) 100%);
            margin-bottom: 16px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(99, 102, 241, 0.1);
            transition: all 0.3s ease;
        }

        .faq-item.active {
            box-shadow: var(--shadow-lg);
            border-color: rgba(99, 102, 241, 0.3);
        }

        .faq-question {
            padding: 24px;
            background: linear-gradient(135deg, var(--bg-light) 0%, rgba(99, 102, 241, 0.05) 100%);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            color: var(--text-dark);
            transition: all 0.3s ease;
            user-select: none;
            font-size: 16px;
        }

        .faq-question:hover {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
        }

        .faq-toggle {
            font-size: 22px;
            transition: transform 0.3s ease;
            color: var(--primary);
        }

        .faq-item.active .faq-toggle {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-item.active .faq-answer {
            max-height: 600px;
            padding: 24px;
            background: var(--bg-white);
            border-top: 1px solid rgba(99, 102, 241, 0.1);
        }

        .faq-answer p {
            color: var(--text-light);
            line-height: 1.9;
            font-size: 15px;
        }

        /* ==================== 使用教程 ==================== */
        .tutorial {
            padding: 100px 0;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(236, 72, 153, 0.03) 100%);
        }

        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }

        .tutorial-card {
            background: var(--bg-white);
            padding: 36px;
            border-radius: 14px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid var(--border);
            position: relative;
        }

        .tutorial-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            border-radius: 14px 14px 0 0;
        }

        .tutorial-card:hover {
            transform: translateY(-12px);
            box-shadow: var(--shadow-lg);
        }

        .tutorial-step {
            font-size: 48px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 16px;
        }

        .tutorial-card h4 {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--text-dark);
            font-weight: 700;
        }

        .tutorial-card p {
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.8;
        }

        /* ==================== 友情链接 ==================== */
        .links {
            padding: 80px 0;
            background: var(--bg-white);
            border-top: 1px solid var(--border);
        }

        .links-title {
            text-align: center;
            font-size: 32px;
            margin-bottom: 50px;
            color: var(--text-dark);
            font-weight: 800;
            letter-spacing: -0.5px;
        }

        .links-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
            margin: 16px auto 0;
            border-radius: 2px;
        }

        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 16px;
        }

        .link-item {
            background: linear-gradient(135deg, var(--bg-light) 0%, rgba(99, 102, 241, 0.05) 100%);
            padding: 18px;
            border-radius: 10px;
            text-align: center;
            border: 1px solid rgba(99, 102, 241, 0.1);
            transition: all 0.3s ease;
        }

        .link-item:hover {
            border-color: var(--primary);
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .link-item a {
            font-weight: 700;
            font-size: 14px;
            display: block;
        }

        /* ==================== 底部 ==================== */
        footer {
            background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
            color: #e5e7eb;
            padding: 60px 0 20px;
            margin-top: 80px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-section h4 {
            margin-bottom: 16px;
            font-size: 16px;
            color: white;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .footer-section ul {
            list-style: none;
        }

        .footer-section li {
            margin-bottom: 12px;
        }

        .footer-section a {
            color: #d1d5db;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .footer-section a:hover {
            color: white;
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(229, 231, 235, 0.2);
            padding-top: 24px;
            text-align: center;
            color: #9ca3af;
            font-size: 13px;
        }

        .footer-disclaimer {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
            color: #d1d5db;
            padding: 24px;
            border-radius: 10px;
            margin-bottom: 30px;
            font-size: 13px;
            line-height: 1.9;
            border-left: 4px solid var(--primary);
        }

        /* ==================== 悬浮模块 ==================== */
        .floating-container {
            position: fixed;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            align-items: center;
            gap: 16px;
            z-index: 99;
        }

        .floating-download {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 14px 32px;
            border-radius: 50px;
            box-shadow: var(--shadow-lg);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 15px;
        }

        .floating-download:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
        }

        .floating-download a {
            color: white;
            font-weight: 700;
            display: inline;
            font-size: 15px;
        }

        .back-to-top {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            border-radius: 50%;
            display: none;
            justify-content: center;
            align-items: center;
            font-size: 24px;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255, 255, 255, 0.2);
            flex-shrink: 0;
        }

        .back-to-top:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
        }

        .back-to-top.show {
            display: flex;
        }

		/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    nav {
        display: none;  /* 改这里：隐藏PC端导航 */
    }

    .nav-right {
        gap: 12px;
    }

    .hero {
        padding: 80px 0;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .section-title {
        font-size: 32px;
        margin-bottom: 40px;
    }

    .features-grid,
    .scenarios-grid,
    .download-grid,
    .requirements-grid,
    .tutorial-grid,
    .links-grid {
        grid-template-columns: 1fr;
    }

    .floating-container {
        left: 50%;
        transform: translateX(-50%);
        flex-direction: column;
        gap: 12px;
        width: auto;
        padding: 0 20px;
    }

    .floating-download {
        width: 100%;
        justify-content: center;
        padding: 12px 24px;
        font-size: 14px;
    }

    .floating-download a {
        font-size: 14px;
    }

    .back-to-top {
        width: 48px;
        height: 48px;
        font-size: 22px;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* 改这里：添加侧边菜单显示 */
    .side-menu {
        display: flex;
    }

    .side-menu nav {
        display: flex;
    }

    .side-menu nav a {
        display: flex;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 20px;
    }

    .logo::before {
        font-size: 24px;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 28px;
        margin-bottom: 16px;
    }

    .hero p {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .section-title {
        font-size: 26px;
        margin-bottom: 30px;
    }

    .feature-card,
    .scenario-item,
    .requirement-card,
    .tutorial-card {
        padding: 24px;
    }

    .features,
    .scenarios,
    .download-section,
    .requirements,
    .faq,
    .tutorial,
    .links {
        padding: 60px 0;
    }

    .download-header {
        font-size: 24px;
        padding: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .lang-trigger {
        padding: 6px 10px;
        font-size: 12px;
    }

    .floating-container {
        gap: 10px;
    }

    .floating-download {
        padding: 10px 20px;
        font-size: 13px;
    }

    .floating-download a {
        font-size: 13px;
    }

    .back-to-top {
        width: 44px;
        height: 44px;
        font-size: 20px;
    }

    /* 改这里：确保侧边菜单显示 */
    .side-menu {
        display: flex;
    }

    .side-menu nav {
        display: flex;
    }

    .side-menu nav a {
        display: flex;
    }
}