/* CSS Variables - Light Mode (Default) */
:root {
    --primary-color: #ff2442;
    --primary-dark: #e01030;
    --primary-light: #ff4d66;
    --secondary-color: #ff4757;
    --accent-color: #10b981;
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --transition-fast: 150ms ease;
    --transition: 300ms ease;
    --transition-slow: 500ms ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
}

/* Dark Mode - Follows System Preference */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #ff2442;
        --primary-dark: #ff4d66;
        --primary-light: #ff6b7a;
        --secondary-color: #ff4757;
        --accent-color: #34d399;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-light: #94a3b8;
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --border-color: #334155;
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
        --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
        --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
        --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.5);
        --phone-bg: #1e293b;
        --phone-header-bg: #1e293b;
        --xhs-bg: #0f172a;
        --xhs-content-bg: #1e293b;
        --note-bg: #334155;
        --chat-bg: #1e293b;
    }
    
    /* 修复夜间模式下的颜色问题 */
    .skip-link {
        background: var(--primary-color);
        color: white;
    }
    
    .phone-screen {
        background: var(--phone-bg) !important;
    }
    
    .xhs-header {
        background: var(--phone-header-bg) !important;
        border-bottom-color: var(--border-color);
    }
    
    .xhs-header span {
        color: var(--text-primary);
    }
    
    .xhs-content {
        background: var(--xhs-content-bg) !important;
    }
    
    .xhs-note {
        background: var(--note-bg) !important;
    }
    
    .xhs-note .note-name {
        color: var(--text-primary);
    }
    
    .xhs-note .note-text {
        color: var(--text-secondary);
    }
    
    .action-btn {
        background: var(--primary-color) !important;
    }
    
    .wechat-preview {
        background: var(--chat-bg) !important;
    }
    
    .wechat-header {
        background: var(--bg-tertiary) !important;
        border-bottom-color: var(--border-color);
    }
    
    .wechat-header span {
        color: var(--text-primary);
    }
    
    .welcome-msg {
        color: var(--text-light);
    }
    
    .bubble {
        background: var(--bg-tertiary) !important;
        color: var(--text-primary);
    }
    
    .chat-bubble.self .bubble {
        /* background: var(--primary-color) !important; */
        color: white !important;
        background: linear-gradient(135deg, #07c160, #06ad56) !important;
    }
    
    .chat-bubble .avatar {
        background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    }
    
    .chat-bubble.self .avatar {
        background: linear-gradient(135deg, #07c160, #06ad56) !important;
    }
    
    .chat-bubble .bubble .time {
        color: rgba(255, 255, 255, 0.7);
    }
    
    .feature-card:hover {
        background: var(--bg-tertiary) !important;
    }
    
    .usage-card {
        background: var(--bg-secondary);
    }
    
    .usage-title {
        color: var(--text-primary);
    }
    
    .usage-description {
        color: var(--text-secondary);
    }
    
    .advantage-item {
        background: var(--bg-secondary);
        border-radius: var(--radius-lg);
    }
    
    .advantage-title {
        color: var(--text-primary);
    }
    
    .advantage-text {
        color: var(--text-secondary);
    }
    
    .faq-item {
        background: var(--bg-secondary);
        border-color: var(--border-color);
    }
    
    .faq-question {
        color: var(--text-primary);
    }
    
    .faq-answer {
        color: var(--text-secondary);
        border-color: var(--border-color);
    }
    
    .cta {
        background: linear-gradient(135deg, #1e293b, #0f172a) !important;
    }
    
    .cta-content {
        color: var(--text-primary) !important;
    }
    
    .footer {
        background: #020617;
    }
    
    .footer-desc {
        color: rgba(255, 255, 255, 0.6);
    }
    
    .footer-links h4 {
        color: white;
    }
    
    .footer-links a {
        color: rgba(255, 255, 255, 0.6);
    }
    
    .footer-links a:hover {
        color: var(--primary-color);
    }
    
    .footer-bottom {
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    .footer-bottom p {
        color: rgba(255, 255, 255, 0.4);
    }
    
    .footer-social a {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .footer-social a:hover {
        background: var(--primary-color);
    }
    
    /* 导航栏暗黑模式 */
    .header {
        background: rgba(15, 23, 42, 0.95) !important;
        border-color: var(--border-color) !important;
    }
    
    .nav-links a {
        color: var(--text-secondary) !important;
    }
    
    .nav-links a:hover {
        color: var(--primary-color) !important;
    }
    
    /* 底部暗黑模式 */
    .footer {
        background: #020617 !important;
    }
    
    .footer-brand .logo-text {
        background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .footer-desc {
        color: rgba(255, 255, 255, 0.6) !important;
    }
    
    .footer-links h4 {
        color: white !important;
    }
    
    .footer-links a {
        color: rgba(255, 255, 255, 0.6) !important;
    }
    
    .footer-links a:hover {
        color: var(--primary-color) !important;
    }
    
    .footer-bottom {
        border-color: rgba(255, 255, 255, 0.1) !important;
    }
    
    .footer-bottom p {
        color: rgba(255, 255, 255, 0.4) !important;
    }
    
    /* 修复硬编码的白色背景 */
    .btn-white {
        background: var(--bg-primary) !important;
        color: var(--primary-color) !important;
    }
    
    .phone-frame {
        background: #1e293b !important;
    }
    
    .phone-notch {
        background: #1e293b !important;
    }
    
    .phone-home {
        background: #1e293b !important;
    }
    
    .xhs-note {
        background: var(--bg-tertiary) !important;
    }
    
    .xhs-content {
        background: var(--xhs-content-bg) !important;
    }
    
    .note-img {
        background: var(--bg-tertiary) !important;
    }
    
    .usage-card {
        background: var(--bg-secondary);
    }
    
    .advantage-item {
        background: var(--bg-secondary);
    }
    
    .faq-item {
        background: var(--bg-secondary);
    }
    
    .step-item {
        background: var(--bg-tertiary) !important;
        border-color: var(--border-color) !important;
    }
    
    .step-text {
        color: var(--text-primary) !important;
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius);
    z-index: 9999;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 1rem;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.938rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-white {
    background: var(--bg-primary);
    color: var(--primary-color);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.938rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

.nav-btn {
    padding: 0.625rem 1.25rem;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 8rem 0 6rem;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255, 36, 66, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 36, 66, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-left {
    max-width: 540px;
}

.product-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 36, 66, 0.1);
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-steps {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1.25rem 0;
}

.step-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.step-icon {
    font-size: 1.25rem;
}

.step-text {
    font-size: 0.938rem;
    font-weight: 500;
    color: var(--text-primary);
}

.step-arrow {
    font-size: 1rem;
    color: var(--text-light);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

/* Phone Demo */
.hero-right {
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-container {
    position: relative;
}

.demo-phone {
    position: relative;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: var(--text-primary);
    border-radius: 2.5rem;
    padding: 0.75rem;
    box-shadow: var(--shadow-xl);
}

.phone-notch {
    width: 120px;
    height: 28px;
    background: var(--text-primary);
    border-radius: 0 0 1.25rem 1.25rem;
    margin: 0 auto 0.5rem;
}

.phone-screen {
    background: var(--bg-primary);
    border-radius: 2rem;
    height: calc(100% - 2rem);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.xhs-header {
    padding: 1rem;
    background: white;
    text-align: center;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
}

.xhs-content {
    flex: 1;
    padding: 1rem;
    background: var(--bg-tertiary);
}

.xhs-note {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 0.75rem;
    box-shadow: var(--shadow-sm);
}

.note-avatar {
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    margin-bottom: 0.5rem;
}

.note-name {
    font-size: 0.813rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.note-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.note-images {
    display: flex;
    gap: 0.375rem;
    margin-bottom: 0.5rem;
}

.note-img {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--border-color));
    border-radius: var(--radius-sm);
}

.note-action {
    text-align: center;
}

.action-btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
}

.phone-home {
    width: 80px;
    height: 4px;
    background: var(--text-primary);
    border-radius: 100px;
    margin: 0.5rem auto;
}

.floating-arrow {
    position: absolute;
    right: -3rem;
    top: 50%;
    transform: translateY(-50%);
    width: 4rem;
    height: 4rem;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    animation: bounce 2s infinite;
}

.floating-arrow svg {
    width: 2rem;
    height: 2rem;
    color: var(--primary-color);
}

@keyframes bounce {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50% { transform: translateY(-50%) translateX(10px); }
}

.wechat-preview {
    position: absolute;
    left: 50%;
    bottom: -1rem;
    transform: translateX(-20%);
    width: 200px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-20%) translateY(0); }
    50% { transform: translateX(-20%) translateY(-10px); }
}

.wechat-header {
    padding: 0.75rem;
    background: #f5f5f5;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
}

.wechat-content {
    padding: 1rem;
}

.welcome-msg {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.chat-bubble {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.chat-bubble .avatar {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    flex-shrink: 0;
}

.chat-bubble.self .avatar {
    background: linear-gradient(135deg, #07c160, #06ad56);
}

.bubble {
    background: var(--bg-tertiary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.75rem;
    max-width: 140px;
}

.chat-bubble.self .bubble {
    background: #e7f9ed;
}

.bubble .time {
    display: block;
    font-size: 0.625rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

/* Wave Decoration */
.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    color: var(--bg-primary);
}

.hero-wave svg {
    display: block;
    width: 100%;
    height: auto;
}

/* Section Styles */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Features Section */
.features {
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    border: 1px solid transparent;
}

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

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, rgba(255, 36, 66, 0.1), rgba(255, 36, 66, 0.05));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.feature-icon svg {
    width: 1.75rem;
    height: 1.75rem;
    color: var(--primary-color);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-description {
    font-size: 0.938rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Usage Section */
.usage {
    background: var(--bg-secondary);
}

.usage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.usage-card {
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.usage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform var(--transition);
}

.usage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.usage-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--bg-tertiary);
    position: absolute;
    top: 1rem;
    right: 1.5rem;
}

.usage-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.usage-description {
    font-size: 0.938rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Advantages Section */
.advantages {
    background: var(--bg-primary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.advantage-item {
    text-align: center;
    padding: 2rem;
    transition: all var(--transition);
}

.advantage-item:hover {
    transform: translateY(-5px);
}

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.advantage-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.advantage-text {
    font-size: 0.938rem;
    color: var(--text-secondary);
}

/* FAQ Section */
.faq {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-primary);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    list-style: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question:hover {
    color: var(--primary-color);
}

.faq-arrow {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--text-light);
    transition: transform var(--transition);
    flex-shrink: 0;
}

details[open] .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.938rem;
    line-height: 1.7;
    border-top: 1px solid transparent;
}

details[open] > .faq-item {
    border-color: var(--primary-light);
}

details[open] > .faq-answer {
    border-color: var(--border-color);
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #fff1f2, #ffe4e6);
    padding: 6rem 0;
}

.cta-content {
    text-align: center;
    color: var(--text-primary);
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cta-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta .btn-primary {
    background: var(--primary-color);
    color: white;
}

.cta .btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
    background: #24292f;
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand .logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.938rem;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: white;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.938rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
}

.footer-social svg {
    width: 1.25rem;
    height: 1.25rem;
}

.back-to-top {
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.back-to-top svg {
    width: 1.25rem;
    height: 1.25rem;
    color: rgba(255, 255, 255, 0.7);
}

.back-to-top:hover {
    background: var(--primary-color);
}

.back-to-top:hover svg {
    color: white;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero-left {
        max-width: 100%;
        text-align: center;
    }

    .hero-steps {
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .step-item {
        padding: 0.625rem 0.875rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-note {
        text-align: center;
    }

    .hero-right {
        order: -1;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .usage-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .hero {
        padding: 7rem 0 4rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-item {
        align-items: center;
    }

    .hero-actions {
        flex-direction: column;
        gap: 0.75rem;
    }

    .phone-frame {
        width: 240px;
        height: 480px;
    }

    .floating-arrow {
        display: none;
    }

    .wechat-preview {
        display: none;
    }

    .section {
        padding: 3.5rem 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

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

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

    .cta-title {
        font-size: 1.75rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-title {
        font-size: 1.875rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 0.938rem;
    }

    .feature-card,
    .usage-card {
        padding: 1.5rem;
    }

    .cta {
        padding: 4rem 0;
    }
}

/* Print Styles */
@media print {
    .header,
    .cta,
    .footer {
        display: none;
    }

    .hero {
        padding: 2rem 0;
    }

    body {
        font-size: 12pt;
        color: black;
    }
}