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

        :root {
            --primary-color: #E94E3A;
            --secondary-color: #f8fafc;
            --text-dark: #0f172a;
            --text-light: #64748b;
            --accent-color: #FA8C69;
            --gradient: linear-gradient(135deg, #FA8C69 0%, #E94E3A 100%);
            --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            overflow-x: hidden;
        }

        .language-switcher {
            /*            position: fixed;*/
            /*            top: 1rem;*/
            /*            right: 1.5rem;*/
            z-index: 9999;
            background: white;
            border: 1px solid #ccc;
            border-radius: 6px;
            padding: 0.4rem 0.6rem;
            /*            box-shadow: 0 4px 12px rgba(0,0,0,0.1);*/
            font-size: 0.95rem;
            font-weight: 500;
            color: #0f172a;
        }

        .language-switcher select {
            border: none;
            background: transparent;
            font-size: inherit;
            font-weight: inherit;
            color: inherit;
            outline: none;
            cursor: pointer;
            appearance: none;
        }

        /* Header */
        .header {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 1rem 0;
            backdrop-filter: blur(20px);
            background: rgba(248, 250, 252, 0.8);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .nav {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 2rem;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            position: relative;
        }

        .logo::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 2px;
            bottom: -4px;
            left: 0;
            background: var(--gradient);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .logo:hover::after {
            transform: scaleX(1);
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-light);
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

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

        /* Hero Section */
        .hero {
            min-height: 100vh;
            background: var(--gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            width: 200%;
            height: 200%;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
            animation: float 20s ease-in-out infinite;
        }

        @keyframes float {

            0%,
            100% {
                transform: translateY(0) rotate(0deg);
            }

            50% {
                transform: translateY(-20px) rotate(180deg);
            }
        }

        .hero-content {
            text-align: center;
            color: white;
            z-index: 2;
            max-width: 800px;
            padding: 0 2rem;
        }

        .app-logo {
            width: 116px;
            /* 可根据你 logo 大小微调 */
            height: auto;
            margin: 0 auto 1rem;
            /* 居中 + 与 h1 的间距 */
            display: block;
            border-radius: 16px;
            /* 圆角设置 */
        }

        .hero h1 {
            font-size: clamp(3rem, 8vw, 5rem);
            font-weight: 800;
            margin-bottom: 1.5rem;
            opacity: 0;
            animation: fadeInUp 1s ease 0.5s forwards;
        }

        .hero p {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
            opacity: 0;
            animation: fadeInUp 1s ease 0.7s forwards;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 0.8rem;
            background: #000000;
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 500;
            font-size: 1.1rem;
            border: 1px solid #333;
            transition: all 0.3s ease;
            opacity: 0;
            animation: fadeInUp 1s ease 0.9s forwards;
            min-width: 200px;
            justify-content: center;
        }

        .cta-button:hover {
            background: #333333;
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
        }

        .app-store-icon {
            width: 24px;
            height: 24px;
            background: linear-gradient(45deg, #007AFF, #34AADC);
            border-radius: 5px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: bold;
        }

        .download-text {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            line-height: 1.2;
        }

        .download-small {
            font-size: 0.75rem;
            opacity: 0.8;
            font-weight: 400;
        }

        .download-main {
            font-size: 1rem;
            font-weight: 500;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Features Section */
        .features {
            padding: 8rem 0;
            background: var(--secondary-color);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .section-title {
            text-align: center;
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 3rem;
            color: var(--text-dark);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 4rem;
        }

        .feature-card {
            background: white;
            padding: 2.5rem;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--gradient);
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
        }

        .feature-icon {
            width: 60px;
            height: 60px;
            background: var(--gradient);
            border-radius: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
        }

        .feature-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }

        .feature-description {
            color: var(--text-light);
            line-height: 1.8;
        }

        /* App Preview */
        .app-preview {
            padding: 8rem 0;
            background: white;
            text-align: center;
        }

        .screenshots-container {
            height: 540px;
            display: flex;
            gap: 1.5rem;
            justify-content: flex-start;
            align-items: center;
            margin: 3rem auto;
            max-width: 100%;
            padding: 0 2rem;
            overflow-x: auto;
            scroll-behavior: smooth;
            scrollbar-width: thin;
            scrollbar-color: rgba(233, 78, 58, 0.3) transparent;
            -webkit-overflow-scrolling: touch;
        }

        .screenshots-container::-webkit-scrollbar {
            height: 6px;
        }

        .screenshots-container::-webkit-scrollbar-track {
            background: rgba(0, 0, 0, 0.1);
            border-radius: 10px;
        }

        .screenshots-container::-webkit-scrollbar-thumb {
            background: var(--gradient);
            border-radius: 10px;
        }

        .screenshots-container::-webkit-scrollbar-thumb:hover {
            background: var(--primary-color);
        }

        .phone-mockup {
            width: 240px;
            height: 480px;
            background: #f8f9fa;
            border-radius: 25px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 8px solid #2c2c2e;
            flex-shrink: 0;
        }

        .phone-mockup:hover {
            transform: translateY(-10px) scale(1.02);
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.25);
        }

        .phone-mockup.featured {
            width: 260px;
            height: 520px;
            border: 10px solid #2c2c2e;
        }

        .screenshot-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 17px;
        }

        .screenshot-placeholder {
            width: 100%;
            height: 100%;
            /*            background: var(--gradient);*/
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.1rem;
            font-weight: 600;
            text-align: center;
            border-radius: 17px;
        }

        .screenshot-placeholder img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
            /* 图片也加点圆角，更柔和 */
        }

        .screenshot-placeholder .icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            opacity: 0.8;
        }

        .screenshot-placeholder .title {
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }

        .screenshot-placeholder .subtitle {
            font-size: 0.8rem;
            opacity: 0.7;
        }

        .scroll-hint {
            text-align: center;
            color: var(--text-light);
            font-size: 0.9rem;
            margin-top: 1rem;
            opacity: 0.8;
        }

        /* Pricing */
        .pricing {
            padding: 8rem 0;
            background: var(--secondary-color);
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 4rem;
        }

        .pricing-card {
            background: white;
            padding: 3rem 2rem;
            border-radius: 20px;
            text-align: center;
            position: relative;
            transition: all 0.3s ease;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .pricing-card.featured {
            background: var(--gradient);
            color: white;
            transform: scale(1.05);
        }

        .pricing-card:hover {
            transform: translateY(-10px);
        }

        .pricing-card.featured:hover {
            transform: scale(1.05) translateY(-10px);
        }

        .price {
            font-size: 3rem;
            font-weight: 800;
            margin: 1rem 0;
        }

        .price-period {
            font-size: 0.9rem;
            opacity: 0.8;
        }

        .features-list {
            list-style: none;
            margin: 2rem 0;
            text-align: left;
        }

        .features-list li {
            padding: 0.5rem 0;
            position: relative;
            padding-left: 1.5rem;
        }

        .features-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent-color);
            font-weight: bold;
        }

        /* Footer */
        .footer {
            background: var(--text-dark);
            color: white;
            padding: 4rem 0 2rem;
            text-align: center;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: white;
            text-decoration: none;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .footer-links a:hover {
            opacity: 1;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

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

            .screenshots-container {
                padding: 0 1rem;
                gap: 1rem;
            }

            .phone-mockup {
                width: 200px;
                height: 400px;
                border: 6px solid #2c2c2e;
            }

            .phone-mockup.featured {
                width: 220px;
                height: 440px;
                border: 8px solid #2c2c2e;
            }

            .scroll-hint {
                font-size: 0.8rem;
                margin-top: 0.5rem;
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .section-title {
                font-size: 2rem;
            }
        }

        /* Smooth scrolling */
        html {
            scroll-behavior: smooth;
        }

        /* Loading animation */
        .loading {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            animation: fadeOut 0.2s ease 0.4s forwards;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-top: 3px solid white;
            border-radius: 50%;
            animation: spin 0.5s linear infinite;
        }

        @keyframes spin {
            0% {
                transform: rotate(0deg);
            }

            100% {
                transform: rotate(360deg);
            }
        }

        @keyframes fadeOut {
            to {
                opacity: 0;
                visibility: hidden;
            }
        }