* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: #333;
            background-color: #f8f9fa;
            line-height: 1.6;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* ================= 顶部通知条 ================= */
        .top-banner {
            background: linear-gradient(90deg, #d32f2f, #f44336, #d32f2f);
            background-size: 200% 100%;
            animation: gradientMove 3s ease infinite;
            color: #fff;
            text-align: center;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 500;
            position: relative;
            z-index: 1001;
        }
        .top-banner a {
            color: #ffeb3b;
            font-weight: bold;
            text-decoration: underline;
            margin-left: 8px;
        }
        @keyframes gradientMove {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

        /* ================= 头部导航 ================= */
        header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-wrap img {
            height: 45px;
            width: auto;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        .logo-text {
            font-size: 22px;
            font-weight: bold;
            color: #d32f2f;
        }
        .logo-text span { color: #1976d2; }
        
        nav {
            display: flex;
            align-items: center;
            gap: 25px;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 28px;
        }
        nav ul li a {
            font-size: 15px;
            font-weight: 500;
            color: #555;
            transition: color 0.3s;
            position: relative;
        }
        nav ul li a:hover { color: #d32f2f; }
        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: #d32f2f;
            transition: width 0.3s;
        }
        nav ul li a:hover::after { width: 100%; }

        .nav-wechat-btn {
            background: linear-gradient(135deg, #07c160, #06ad56);
            color: #fff !important;
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: bold;
            box-shadow: 0 3px 10px rgba(7, 193, 96, 0.3);
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .nav-wechat-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(7, 193, 96, 0.4);
        }
        .nav-wechat-btn::after { display: none !important; }

        .beijing-time {
            font-size: 13px;
            color: #666;
            background: #f5f5f5;
            padding: 6px 12px;
            border-radius: 20px;
            font-family: 'Courier New', monospace;
            white-space: nowrap;
        }

        /* ================= 首屏 Hero ================= */
        .hero {
            background: linear-gradient(135deg, #fff5f5 0%, #e3f2fd 50%, #f3e5f5 100%);
            padding: 90px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(211, 47, 47, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            animation: float 8s ease-in-out infinite;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(25, 118, 210, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            animation: float 10s ease-in-out infinite reverse;
        }
        @keyframes float {
            0%, 100% { transform: translate(0, 0); }
            50% { transform: translate(30px, -30px); }
        }
        .hero .container { position: relative; z-index: 1; }
        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            padding: 8px 20px;
            border-radius: 20px;
            font-size: 14px;
            color: #d32f2f;
            font-weight: 500;
            margin-bottom: 25px;
            border: 1px solid rgba(211, 47, 47, 0.2);
        }
        .hero h1 {
            font-size: 48px;
            color: #222;
            margin-bottom: 20px;
            font-weight: 800;
            letter-spacing: -1px;
        }
        .hero h1 em {
            font-style: normal;
            background: linear-gradient(135deg, #d32f2f, #f44336);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 18px;
            color: #555;
            max-width: 650px;
            margin: 0 auto 35px;
        }
        .btn-group { 
            display: flex; 
            justify-content: center; 
            gap: 15px; 
            flex-wrap: wrap;
            margin-bottom: 25px;
        }
        .btn {
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: bold;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-wechat {
            background: linear-gradient(135deg, #07c160, #06ad56);
            color: #fff;
            box-shadow: 0 6px 20px rgba(7, 193, 96, 0.35);
            animation: pulse 2s infinite;
        }
        .btn-wechat:hover { 
            transform: translateY(-3px); 
            box-shadow: 0 8px 25px rgba(7, 193, 96, 0.5);
            animation: none;
        }
        @keyframes pulse {
            0% { box-shadow: 0 6px 20px rgba(7, 193, 96, 0.35), 0 0 0 0 rgba(7, 193, 96, 0.5); }
            70% { box-shadow: 0 6px 20px rgba(7, 193, 96, 0.35), 0 0 0 15px rgba(7, 193, 96, 0); }
            100% { box-shadow: 0 6px 20px rgba(7, 193, 96, 0.35), 0 0 0 0 rgba(7, 193, 96, 0); }
        }
        .btn-outline {
            background: #fff;
            color: #1976d2;
            border: 2px solid #1976d2;
        }
        .btn-outline:hover { 
            background: #1976d2; 
            color: #fff;
            transform: translateY(-3px);
        }
        .hero-tip {
            font-size: 13px;
            color: #888;
            margin-top: 10px;
        }
        .hero-tip span { color: #07c160; font-weight: bold; }

        /* ================= 通用区块 ================= */
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-title h2 { 
            font-size: 34px; 
            color: #222; 
            margin-bottom: 12px;
            font-weight: 700;
        }
        .section-title p { color: #888; font-size: 16px; }
        .section-title .divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #d32f2f, #1976d2);
            margin: 15px auto 0;
            border-radius: 2px;
        }

        /* ================= 核心功能 ================= */
        .features { padding: 90px 0; background: #fff; }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }
        .feature-card {
            background: #fff;
            padding: 35px 25px;
            border-radius: 16px;
            text-align: center;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            border: 1px solid #f0f0f0;
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #d32f2f, #1976d2);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s;
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.1);
            border-color: transparent;
        }
        .feature-card:hover::before { transform: scaleX(1); }
        .feature-icon {
            width: 70px; height: 70px;
            background: linear-gradient(135deg, #ffebee, #e3f2fd);
            border-radius: 20px;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 20px;
            font-size: 32px;
            transition: transform 0.4s;
        }
        .feature-card:hover .feature-icon {
            transform: rotate(360deg) scale(1.1);
        }
        .feature-card h3 { font-size: 20px; margin-bottom: 12px; color: #222; font-weight: 600; }
        .feature-card p { font-size: 14px; color: #666; line-height: 1.7; }

        /* ================= App 截图展示 ================= */
        .app-showcase {
            padding: 90px 0;
            background: linear-gradient(180deg, #f8f9fa 0%, #fff 100%);
        }
        .screenshots-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .screenshot-item {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.12);
            transition: all 0.4s;
            background: #fff;
            position: relative;
        }
        .screenshot-item:hover { 
            transform: translateY(-10px) scale(1.02);
            box-shadow: 0 20px 50px rgba(0,0,0,0.2);
        }
        .screenshot-item img {
            width: 100%;
            height: auto;
            aspect-ratio: 9/16;
            object-fit: cover;
        }

        /* ================= 微信福利横幅 ================= */
        .wechat-banner {
            padding: 60px 0;
            background: linear-gradient(135deg, #07c160 0%, #06ad56 50%, #059647 100%);
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .wechat-banner::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
            border-radius: 50%;
        }
        .wechat-banner h2 {
            font-size: 32px;
            margin-bottom: 15px;
            font-weight: 700;
            position: relative;
        }
        .wechat-banner p {
            font-size: 16px;
            opacity: 0.95;
            margin-bottom: 25px;
            position: relative;
        }
        .wechat-banner .btn {
            background: #fff;
            color: #07c160;
            font-size: 17px;
            padding: 15px 40px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.2);
            position: relative;
        }
        .wechat-banner .btn:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        /* ================= 微信号展示区 ================= */
        .contact-wechat {
            padding: 90px 0;
            background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 50%, #fff9c4 100%);
            position: relative;
        }
        .wechat-cards {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
            max-width: 850px;
            margin: 0 auto;
        }
        .wechat-card {
            background: #fff;
            border-radius: 20px;
            padding: 40px 30px;
            text-align: center;
            box-shadow: 0 10px 40px rgba(7, 193, 96, 0.15);
            transition: all 0.4s;
            border: 2px solid transparent;
            position: relative;
            overflow: hidden;
        }
        .wechat-card::before {
            content: '推荐';
            position: absolute;
            top: 15px;
            right: -30px;
            background: linear-gradient(135deg, #d32f2f, #f44336);
            color: #fff;
            padding: 4px 35px;
            font-size: 12px;
            font-weight: bold;
            transform: rotate(45deg);
        }
        .wechat-card:nth-child(2)::before {
            content: '备用';
            background: linear-gradient(135deg, #1976d2, #42a5f5);
        }
        .wechat-card:hover {
            transform: translateY(-8px);
            border-color: #07c160;
            box-shadow: 0 15px 50px rgba(7, 193, 96, 0.3);
        }
        .wechat-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #07c160, #06ad56);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 40px;
            color: #fff;
            box-shadow: 0 8px 20px rgba(7, 193, 96, 0.3);
        }
        .wechat-card h3 {
            font-size: 20px;
            color: #333;
            margin-bottom: 15px;
            font-weight: 600;
        }
        .wechat-id {
            font-size: 26px;
            font-weight: bold;
            color: #07c160;
            margin-bottom: 20px;
            font-family: 'Courier New', monospace;
            letter-spacing: 1px;
            background: #f1f8e9;
            padding: 10px;
            border-radius: 10px;
            border: 2px dashed #07c160;
        }
        .copy-btn {
            background: linear-gradient(135deg, #07c160, #06ad56);
            color: #fff;
            border: none;
            padding: 14px 30px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            width: 100%;
            box-shadow: 0 4px 15px rgba(7, 193, 96, 0.3);
        }
        .copy-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(7, 193, 96, 0.5);
        }
        .copy-btn:active { transform: scale(0.98); }
        .copy-success {
            color: #07c160;
            font-size: 14px;
            margin-top: 12px;
            opacity: 0;
            transition: opacity 0.3s;
            font-weight: 500;
        }
        .copy-success.show { opacity: 1; }

        /* ================= 数据亮点 ================= */
        .stats {
            padding: 70px 0;
            background: linear-gradient(135deg, #1976d2 0%, #1565c0 100%);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .stats::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background-image: 
                radial-gradient(circle at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1) 0%, transparent 50%);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            text-align: center;
            position: relative;
        }
        .stat-item h3 { 
            font-size: 48px; 
            font-weight: bold; 
            margin-bottom: 8px;
            background: linear-gradient(135deg, #fff, #bbdefb);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-item p { font-size: 16px; opacity: 0.95; }

        /* ================= 底部 ================= */
        footer {
            background: #1a1a1a;
            color: #aaa;
            padding: 50px 0 25px;
            text-align: center;
        }
        .footer-logo { margin-bottom: 20px; }
        .footer-logo img { 
            height: 50px; 
            margin: 0 auto; 
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.3);
        }
        .footer-links { margin-bottom: 25px; }
        .footer-links a { 
            margin: 0 15px; 
            color: #ccc; 
            font-size: 14px;
            transition: color 0.3s;
        }
        .footer-links a:hover { color: #07c160; }
        
        .compliance-warning {
            background: rgba(255, 138, 128, 0.1);
            border: 1px solid rgba(255, 138, 128, 0.3);
            padding: 20px;
            border-radius: 12px;
            margin: 25px auto;
            max-width: 850px;
            font-size: 13px;
            color: #ff8a80;
            line-height: 1.9;
        }
        .copyright { font-size: 12px; color: #666; margin-top: 20px; }

        /* ================= 悬浮微信按钮 ================= */
        .float-wechat {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
        }
        .float-wechat-btn {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #07c160, #06ad56);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 28px;
            cursor: pointer;
            box-shadow: 0 6px 20px rgba(7, 193, 96, 0.4);
            transition: all 0.3s;
            position: relative;
        }
        .float-wechat-btn::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            border-radius: 50%;
            background: #07c160;
            opacity: 0.6;
            animation: ripple 1.5s infinite;
            z-index: -1;
        }
        @keyframes ripple {
            0% { transform: scale(1); opacity: 0.6; }
            100% { transform: scale(1.8); opacity: 0; }
        }
        .float-wechat-btn:hover {
            transform: scale(1.1) rotate(10deg);
        }
        .float-wechat-label {
            position: absolute;
            right: 75px;
            top: 50%;
            transform: translateY(-50%);
            background: #333;
            color: #fff;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 13px;
            white-space: nowrap;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
            animation: labelBounce 2s infinite;
        }
        .float-wechat-label::after {
            content: '';
            position: absolute;
            right: -6px;
            top: 50%;
            transform: translateY(-50%);
            border: 6px solid transparent;
            border-left-color: #333;
        }
        @keyframes labelBounce {
            0%, 100% { transform: translateY(-50%) translateX(0); }
            50% { transform: translateY(-50%) translateX(-5px); }
        }
        
        .float-wechat-panel {
            position: absolute;
            bottom: 75px;
            right: 0;
            background: #fff;
            border-radius: 16px;
            padding: 20px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.2);
            width: 260px;
            display: none;
            animation: slideUp 0.3s ease;
        }
        .float-wechat-panel.show { display: block; }
        @keyframes slideUp {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .float-wechat-panel h4 {
            font-size: 16px;
            color: #222;
            margin-bottom: 15px;
            text-align: center;
            font-weight: 600;
        }
        .float-wechat-item {
            background: #f8f9fa;
            padding: 12px;
            border-radius: 10px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            transition: all 0.3s;
        }
        .float-wechat-item:hover {
            background: #e8f5e9;
        }
        .float-wechat-item:last-child { margin-bottom: 0; }
        .float-wechat-item-info {
            flex: 1;
        }
        .float-wechat-item-info .label {
            font-size: 12px;
            color: #888;
        }
        .float-wechat-item-info .id {
            font-size: 15px;
            font-weight: bold;
            color: #07c160;
            font-family: 'Courier New', monospace;
        }
        .float-copy-btn {
            background: #07c160;
            color: #fff;
            border: none;
            padding: 6px 12px;
            border-radius: 15px;
            font-size: 12px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s;
        }
        .float-copy-btn:hover {
            background: #06ad56;
            transform: scale(1.05);
        }

        /* ================= 返回顶部 ================= */
        .back-to-top {
            position: fixed;
            bottom: 100px;
            right: 35px;
            width: 45px;
            height: 45px;
            background: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            cursor: pointer;
            z-index: 998;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            font-size: 18px;
            color: #d32f2f;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.2);
        }

        /* ================= 滚动渐入动画 ================= */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ================= 响应式：平板（768px - 1024px） ================= */
        @media (max-width: 1024px) and (min-width: 769px) {
            .container { padding: 0 30px; }
            .hero h1 { font-size: 40px; }
            .hero p { font-size: 17px; }
            .section-title h2 { font-size: 30px; }
            .screenshots-grid { grid-template-columns: repeat(2, 1fr); }
            .wechat-cards { gap: 25px; }
        }

        /* ================= 响应式：手机（768px 以下） ================= */
        @media (max-width: 768px) {
            .top-banner { 
                font-size: 12px; 
                padding: 8px 15px; 
            }
            .top-banner a { 
                display: block; 
                margin: 5px 0 0 0; 
            }
            
            .nav-container { 
                flex-direction: column; 
                height: auto; 
                padding: 12px 0; 
                gap: 10px; 
            }
            .logo-wrap img { height: 40px; }
            .logo-text { font-size: 20px; }
            
            nav { 
                flex-direction: column; 
                gap: 10px; 
                width: 100%; 
            }
            nav ul { 
                gap: 12px; 
                flex-wrap: wrap; 
                justify-content: center; 
            }
            nav ul li a { font-size: 14px; }
            .nav-wechat-btn { 
                padding: 6px 15px; 
                font-size: 13px; 
            }
            .beijing-time { 
                font-size: 11px; 
                padding: 4px 10px; 
            }
            
            .hero { 
                padding: 50px 0 60px; 
            }
            .hero-badge { 
                font-size: 12px; 
                padding: 6px 15px; 
            }
            .hero h1 { 
                font-size: 28px; 
                letter-spacing: 0;
            }
            .hero p { 
                font-size: 15px; 
                margin-bottom: 25px;
            }
            .btn { 
                padding: 12px 24px; 
                font-size: 14px; 
                width: 100%;
                max-width: 300px;
            }
            .btn-group { 
                flex-direction: column; 
                align-items: center;
            }
            .hero-tip { font-size: 12px; }
            
            .section-title h2 { font-size: 24px; }
            .section-title p { font-size: 14px; }
            .section-title { margin-bottom: 35px; }
            
            .features { padding: 60px 0; }
            .features-grid { 
                grid-template-columns: 1fr; 
                gap: 20px; 
            }
            .feature-card { padding: 25px 20px; }
            .feature-icon { width: 60px; height: 60px; font-size: 28px; }
            .feature-card h3 { font-size: 18px; }
            .feature-card p { font-size: 13px; }
            
            .app-showcase { padding: 60px 0; }
            .screenshots-grid { 
                grid-template-columns: repeat(2, 1fr); 
                gap: 15px; 
            }
            
            .wechat-banner { padding: 40px 0; }
            .wechat-banner h2 { font-size: 22px; }
            .wechat-banner p { font-size: 14px; }
            .wechat-banner .btn { 
                font-size: 15px; 
                padding: 12px 30px; 
            }
            
            .contact-wechat { padding: 60px 0; }
            .wechat-cards { 
                grid-template-columns: 1fr; 
                gap: 20px; 
            }
            .wechat-card { padding: 30px 20px; }
            .wechat-icon { width: 70px; height: 70px; font-size: 35px; }
            .wechat-card h3 { font-size: 18px; }
            .wechat-id { font-size: 20px; }
            .copy-btn { padding: 12px 25px; font-size: 15px; }
            
            .stats { padding: 50px 0; }
            .stats-grid { gap: 20px; }
            .stat-item h3 { font-size: 36px; }
            .stat-item p { font-size: 14px; }
            
            footer { padding: 40px 0 20px; }
            .footer-logo img { height: 45px; }
            .footer-links a { 
                margin: 0 10px; 
                font-size: 13px; 
            }
            .compliance-warning { 
                padding: 15px; 
                font-size: 12px; 
                margin: 20px 10px;
            }
            .copyright { font-size: 11px; }
            
            .float-wechat { 
                bottom: 20px; 
                right: 20px; 
            }
            .float-wechat-btn { 
                width: 55px; 
                height: 55px; 
                font-size: 24px; 
            }
            .float-wechat-label { display: none; }
            .float-wechat-panel { 
                width: 240px; 
                right: -5px; 
                padding: 15px;
            }
            .float-wechat-panel h4 { font-size: 15px; }
            .float-wechat-item { padding: 10px; }
            .float-wechat-item-info .id { font-size: 14px; }
            
            .back-to-top { 
                bottom: 85px; 
                right: 25px; 
                width: 40px; 
                height: 40px; 
                font-size: 16px;
            }
        }

        /* ================= 响应式：小屏手机（480px 以下） ================= */
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            .hero h1 { font-size: 24px; }
            .hero p { font-size: 14px; }
            .btn { 
                padding: 11px 20px; 
                font-size: 13px; 
            }
            .section-title h2 { font-size: 22px; }
            .feature-card h3 { font-size: 17px; }
            .wechat-id { font-size: 18px; }
            .stat-item h3 { font-size: 32px; }
            .stat-item p { font-size: 13px; }
            .screenshots-grid { 
                grid-template-columns: 1fr; 
                max-width: 300px;
                margin-left: auto;
                margin-right: auto;
            }
            .float-wechat-panel { width: 220px; }
        }
    
button{font:inherit;cursor:pointer}.float-wechat-btn{border:0}.back-to-top{border:0}section[id]{scroll-margin-top:180px}.wechat-id{overflow-wrap:anywhere}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:#15352b;color:white;border-radius:12px;padding:14px 20px;opacity:0;pointer-events:none;z-index:9999;max-width:90vw;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}

:focus-visible{outline:3px solid #177aab;outline-offset:4px}[data-copy]:disabled{opacity:.5;cursor:default}strong[data-invite]{overflow-wrap:anywhere} .fade-in{opacity:1} @media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}html{scroll-behavior:auto!important}}