/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 - TikTok风格黑白配色 */
:root {
    /* 主色调 - 纯黑白系 */
    --primary-color: #000000;
    --primary-dark: #000000;
    --primary-light: #333333;
    --primary-gradient-start: #000000;
    --primary-gradient-mid: #1a1a1a;
    --primary-gradient-end: #333333;
    
    /* 辅助色彩 */
    --secondary-color: #f0f0f0;
    --accent-color: #000000;
    --hover-color: #f5f5f5;
    
    /* 文字颜色 */
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-inverse: #ffffff;
    
    /* 背景色 - 纯白为主 */
    --background: #ffffff;
    --background-light: #fafafa;
    --background-section: #ffffff;
    --background-dark: #000000;
    --background-card: #ffffff;
    
    /* 边框和阴影 */
    --border-color: #e0e0e0;
    --border-light: #f0f0f0;
    --border-dark: #000000;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
    
    /* 圆角 - TikTok风格更圆润 */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 24px;
    --border-radius-full: 50px;
    
    /* 动画 */
    --transition: all 0.2s ease;
    --transition-fast: all 0.15s ease;
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
}

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

/* 导航栏 - TikTok风格 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: var(--transition);
    height: 64px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 900;
    font-size: 28px;
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition-bounce);
}

.nav-brand:hover {
    transform: scale(1.05);
}

.logo {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: 900;
    font-size: 18px;
    letter-spacing: -0.02em;
    position: relative;
    overflow: hidden;
}

.logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s;
}

.nav-brand:hover .logo::before {
    left: 100%;
}

.brand-name {
    letter-spacing: -0.02em;
    position: relative;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-download {
    background: var(--primary-color);
    color: var(--text-inverse) !important;
    padding: 12px 24px;
    border-radius: var(--border-radius-full);
    transition: var(--transition-bounce);
    font-weight: 600;
    font-size: 14px;
}

.btn-download:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* 语言切换器样式 */
.nav-lang-switch {
    position: relative;
}

.lang-switcher {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-primary);
    transition: var(--transition);
    min-width: 80px;
}

.lang-switcher:hover {
    border-color: var(--primary-color);
    background: var(--background-light);
}

.lang-current {
    font-weight: 500;
}

.lang-arrow {
    font-size: 12px;
    transition: transform 0.2s ease;
}

.lang-switcher.active .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 120px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

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

.lang-option {
    padding: 12px 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.lang-option:hover {
    background: var(--background-light);
}

.lang-option.active {
    background: var(--primary-color);
    color: var(--text-inverse);
}

.lang-option:first-child {
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* 英雄区域 - TikTok风格简洁设计 */
.hero {
    padding: 80px 0 60px;
    background: var(--background);
    color: var(--text-primary);
    overflow: hidden;
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.gradient-text {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 20px;
    line-height: 1.6;
    margin-bottom: 40px;
    color: var(--text-secondary);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 16px 32px;
    border-radius: var(--border-radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    transition: var(--transition-bounce);
    display: inline-block;
    border: 2px solid transparent;
    cursor: pointer;
    min-width: 140px;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--text-inverse);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 14px 28px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    display: inline-block;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
}

.hero-stats {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.stat {
    text-align: left;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 手机模型 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--primary-color);
    border-radius: 32px;
    padding: 6px;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

.app-interface {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.app-header {
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.app-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
}

.translation-demo {
    text-align: center;
    margin: 60px 0;
}

.demo-input, .demo-output {
    background: var(--background-light);
    padding: 16px 20px;
    border-radius: var(--border-radius-lg);
    margin: 12px 0;
    box-shadow: var(--shadow-card);
}

.demo-input {
    background: var(--background-light);
    color: var(--text-primary);
    font-weight: 500;
    border: 1px solid var(--border-light);
}

.demo-output {
    background: var(--primary-color);
    color: var(--text-inverse);
    font-weight: 500;
}

.demo-arrow {
    font-size: 24px;
    color: var(--text-light);
    margin: 8px 0;
}

.voice-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.voice-waves {
    display: flex;
    gap: 4px;
    align-items: center;
}

.voice-waves span {
    width: 4px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: wave 1.5s ease-in-out infinite;
}

.voice-waves span:nth-child(2) { animation-delay: 0.2s; }
.voice-waves span:nth-child(3) { animation-delay: 0.4s; }
.voice-waves span:nth-child(4) { animation-delay: 0.6s; }

@keyframes wave {
    0%, 100% { height: 20px; }
    50% { height: 40px; }
}

.screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

.app-interface {
    padding: 40px 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.language-selector {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-light);
    padding: 16px;
    border-radius: var(--border-radius);
    margin-bottom: 40px;
}

.lang-from, .lang-to {
    font-weight: 600;
    color: var(--text-primary);
}

.swap-icon {
    font-size: 20px;
    color: var(--primary-color);
}

.voice-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin: 40px 0;
}

.voice-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.voice-waves {
    display: flex;
    gap: 4px;
    align-items: end;
}

.voice-waves span {
    width: 4px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: wave 1.2s infinite;
}

.voice-waves span:nth-child(1) { height: 20px; animation-delay: 0s; }
.voice-waves span:nth-child(2) { height: 32px; animation-delay: 0.1s; }
.voice-waves span:nth-child(3) { height: 24px; animation-delay: 0.2s; }
.voice-waves span:nth-child(4) { height: 28px; animation-delay: 0.3s; }

@keyframes wave {
    0%, 100% { transform: scaleY(0.5); }
    50% { transform: scaleY(1); }
}

.translation-result {
    background: var(--background-light);
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
}

.original-text {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 500;
}

.translated-text {
    font-size: 16px;
    color: var(--primary-color);
    font-weight: 600;
}

/* 产品演示 */
.demo-section {
    padding: 60px 0;
    background: white;
}

.demo-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.demo-phone {
    width: 300px;
    height: 600px;
    background: var(--primary-color);
    border-radius: 32px;
    padding: 6px;
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
    position: relative;
}

.demo-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

.demo-interface {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 14px;
    font-weight: 600;
}

.demo-title {
    color: var(--primary-color);
}

.demo-language-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--background-light);
    padding: 16px;
    border-radius: var(--border-radius);
    margin: 20px 0;
}

.demo-lang {
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.demo-lang.active {
    background: var(--primary-color);
    color: white;
}

.demo-swap {
    font-size: 20px;
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

.demo-swap:hover {
    transform: rotate(180deg);
}

.demo-conversation {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px 0;
    overflow-y: auto;
}

.demo-message {
    max-width: 80%;
    animation: messageSlideIn 0.5s ease;
}

.demo-message.user {
    align-self: flex-end;
}

.demo-message.ai {
    align-self: flex-start;
}

.message-text {
    background: var(--primary-color);
    color: white;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 14px;
    margin-bottom: 4px;
}

.demo-message.ai .message-text {
    background: var(--background-light);
    color: var(--text-primary);
}

.message-translation {
    font-size: 12px;
    color: var(--text-light);
    padding: 0 16px;
    font-style: italic;
}

.demo-voice-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 20px 0;
}

.voice-btn-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    cursor: pointer;
    transition: var(--transition);
    animation: pulse 2s infinite;
}

.voice-btn-icon:hover {
    transform: scale(1.1);
}

.demo-waves {
    display: flex;
    gap: 3px;
    align-items: end;
}

.demo-waves span {
    width: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: demoWave 1.2s infinite;
}

.demo-waves span:nth-child(1) { height: 15px; animation-delay: 0s; }
.demo-waves span:nth-child(2) { height: 25px; animation-delay: 0.1s; }
.demo-waves span:nth-child(3) { height: 20px; animation-delay: 0.2s; }
.demo-waves span:nth-child(4) { height: 18px; animation-delay: 0.3s; }

@keyframes demoWave {
    0%, 100% { transform: scaleY(0.5); opacity: 0.5; }
    50% { transform: scaleY(1); opacity: 1; }
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.demo-features {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.demo-feature {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--background-light);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
}

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

.demo-feature-icon {
    font-size: 32px;
    width: 60px;
    height: 60px;
    background: var(--background-card);
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-card);
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.demo-feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    transform: scale(0);
    transition: var(--transition-bounce);
    border-radius: var(--border-radius-lg);
}

.demo-feature:hover .demo-feature-icon {
    border-color: var(--primary-color);
    color: var(--text-inverse);
}

.demo-feature:hover .demo-feature-icon::before {
    transform: scale(1);
}

.demo-feature h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.demo-feature p {
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* 功能特性 */
.features {
    padding: 60px 0;
    background: var(--background-section);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--background-card);
    padding: 40px 32px;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-light);
    text-align: center;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

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

.feature-icon {
    font-size: 56px;
    margin-bottom: 24px;
    transition: var(--transition-bounce);
    background: var(--background-light);
    width: 80px;
    height: 80px;
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px auto;
    border: 2px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    transform: scale(0);
    transition: var(--transition-bounce);
    border-radius: var(--border-radius-xl);
}

.feature-card:hover .feature-icon {
    border-color: var(--primary-color);
    transform: scale(1.1);
    color: var(--text-inverse);
}

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

.feature-icon span {
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

/* 使用场景 */
.use-cases {
    padding: 60px 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.use-case {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px 24px;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.use-case-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.placeholder-image {
    width: 200px;
    height: 200px;
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: var(--text-primary);
    background: var(--background-light);
    border: 2px solid var(--border-light);
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.placeholder-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    transform: scale(0);
    transition: var(--transition-bounce);
    border-radius: var(--border-radius-xl);
}

.use-case:hover .placeholder-image {
    border-color: var(--primary-color);
    color: var(--text-inverse);
    transform: scale(1.05);
}

.use-case:hover .placeholder-image::before {
    transform: scale(1);
}

.placeholder-image span {
    position: relative;
    z-index: 1;
}

.use-case-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.use-case-content p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 定价方案 */
.pricing {
    padding: 60px 0;
    background: var(--background-light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: 20px;
    color: var(--text-secondary);
}

.amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
}

.period {
    font-size: 16px;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.pricing-btn {
    width: 100%;
    background: var(--primary-color);
    color: white;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    text-decoration: none;
    text-align: center;
    font-weight: 600;
    display: block;
    transition: var(--transition);
}

.pricing-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* 用户评价 */
.testimonials {
    padding: 60px 0;
    background: var(--background-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.testimonial-rating {
    font-size: 20px;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-title {
    font-size: 14px;
    color: var(--text-light);
}

/* FAQ部分 */
.faq {
    padding: 60px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--background-light);
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.faq-toggle {
    font-size: 24px;
    font-weight: 300;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-answer {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

/* 下载应用 */
.download {
    padding: 100px 0;
    background: var(--background-dark);
    color: var(--text-inverse);
    text-align: center;
}

.download-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 32px;
}

.download-stat {
    text-align: center;
}

.download-stat .stat-number {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary-color);
}

.download-stat .stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.download-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.download-content p {
    font-size: 18px;
    margin-bottom: 48px;
    color: rgba(255, 255, 255, 0.9);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--text-inverse);
    border: 2px solid var(--text-inverse);
    padding: 20px 28px;
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition-bounce);
    box-shadow: var(--shadow-lg);
    font-weight: 600;
}

.download-btn:hover {
    background: transparent;
    border-color: var(--text-inverse);
    color: var(--text-inverse);
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(255, 255, 255, 0.2);
}

.download-btn img {
    height: 40px;
}

.download-btn.web span {
    font-size: 24px;
}

.btn-title {
    font-weight: 600;
    font-size: 16px;
}

.btn-subtitle {
    font-size: 14px;
    opacity: 0.8;
}

/* 页脚 */
.footer {
    background: var(--background);
    color: var(--text-primary);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-light);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: 900;
    font-size: 18px;
    letter-spacing: -0.02em;
    transition: var(--transition-bounce);
}

.footer-logo:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.footer-brand-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    background: var(--background-light);
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    transform: scale(0);
    transition: var(--transition-bounce);
    border-radius: var(--border-radius-lg);
}

.social-link:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.social-link:hover::before {
    transform: scale(1);
}

.social-icon {
    font-size: 20px;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.social-link:hover .social-icon {
    filter: invert(1);
}

.footer-download {
    margin-top: 32px;
}

.footer-download h4 {
    font-size: 16px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.9);
}

.footer-download-buttons {
    display: flex;
    gap: 12px;
}

.footer-download-btn {
    display: block;
    transition: var(--transition);
}

.footer-download-btn:hover {
    transform: translateY(-2px);
}

.download-icon {
    height: 32px;
    opacity: 0.8;
}

.footer-download-btn:hover .download-icon {
    opacity: 1;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid var(--border-light);
    padding-top: 32px;
    text-align: center;
    color: var(--text-light);
}

/* 法律文档页面样式 */
.page-hero {
    padding: 80px 0 40px;
    background: var(--background);
    color: var(--text-primary);
    text-align: center;
    border-bottom: 1px solid var(--border-light);
}

.page-hero-content h1 {
    font-size: 48px;
    font-weight: 900;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.page-hero-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.page-meta {
    font-size: 14px;
    color: var(--text-light);
    padding: 8px 16px;
    background: var(--background-light);
    border-radius: var(--border-radius);
    display: inline-block;
}

/* 法律文档内容样式 */
.legal-content {
    padding: 60px 0;
    background: var(--background);
}

.legal-document {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.legal-section {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-light);
}

.legal-section:last-child {
    border-bottom: none;
}

.legal-section h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

.legal-section h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 24px 0 16px 0;
}

.legal-section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 16px;
}

.legal-section ul {
    margin: 16px 0;
    padding-left: 24px;
}

.legal-section li {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 16px;
}

.legal-section li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.contact-info {
    background: var(--background-light);
    padding: 24px;
    border-radius: var(--border-radius-lg);
    margin-top: 16px;
    border-left: 4px solid var(--primary-color);
}

.contact-info p {
    margin-bottom: 8px;
    font-size: 16px;
}

.contact-info strong {
    color: var(--text-primary);
    font-weight: 600;
}

.page-hero-content h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
}

.page-hero-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
}

.nav-menu a.active {
    color: var(--primary-color);
    font-weight: 600;
}

.feature-details {
    padding: 60px 0;
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 120px;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse .feature-detail-content {
    direction: ltr;
}

.feature-detail-content h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.feature-detail-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.feature-detail-content ul {
    list-style: none;
    padding: 0;
}

.feature-detail-content ul li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 20px;
}

.feature-detail-content ul li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.demo-box {
    background: var(--background-light);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow);
}

.waveform {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 20px;
}

.waveform span {
    width: 6px;
    background: var(--primary-color);
    border-radius: 3px;
    animation: wave 1.5s infinite;
}

.waveform span:nth-child(1) { height: 30px; animation-delay: 0s; }
.waveform span:nth-child(2) { height: 40px; animation-delay: 0.1s; }
.waveform span:nth-child(3) { height: 35px; animation-delay: 0.2s; }
.waveform span:nth-child(4) { height: 45px; animation-delay: 0.3s; }
.waveform span:nth-child(5) { height: 32px; animation-delay: 0.4s; }

.demo-text {
    color: var(--text-secondary);
    font-style: italic;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.lang-item {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 14px;
}

.security-shield {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.shield-icon {
    font-size: 48px;
    animation: pulse 2s infinite;
}

.encryption-lines {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
}

.encryption-lines span {
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: encrypt 2s infinite;
}

.encryption-lines span:nth-child(1) { width: 80%; animation-delay: 0s; }
.encryption-lines span:nth-child(2) { width: 60%; animation-delay: 0.3s; }
.encryption-lines span:nth-child(3) { width: 90%; animation-delay: 0.6s; }

@keyframes encrypt {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.offline-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.wifi-off {
    font-size: 32px;
    opacity: 0.5;
}

.offline-text {
    font-weight: 600;
    color: var(--text-primary);
}

.download-progress {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-color);
    width: 70%;
    border-radius: 4px;
    animation: progress 3s infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.advanced-features {
    padding: 60px 0;
    background: var(--background-light);
}

.advanced-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.advanced-feature {
    background: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.advanced-feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.advanced-feature .feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.advanced-feature h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.advanced-feature p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.tech-specs {
    padding: 60px 0;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.spec-category {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
}

.spec-category h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
}

.specs-table td {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.specs-table td:first-child {
    color: var(--text-secondary);
    font-weight: 500;
}

.specs-table td:last-child {
    text-align: right;
    color: var(--primary-color);
    font-weight: 600;
}

.specs-table tr:last-child td {
    border-bottom: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 32px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .demo-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .demo-phone {
        width: 240px;
        height: 480px;
    }
    
    .demo-features {
        gap: 24px;
    }
    
    .demo-feature {
        flex-direction: column;
        text-align: center;
    }
    
    .download-stats {
        gap: 32px;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-download-buttons {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .use-case {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .use-case:nth-child(even) {
        direction: ltr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 60px 0 40px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .download-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .features, .use-cases, .pricing, .download, .testimonials, .faq {
        padding: 60px 0;
    }
    
    .page-hero-content h1 {
        font-size: 32px;
    }
    
    .feature-detail {
        grid-template-columns: 1fr;
        gap: 40px;
        margin-bottom: 60px;
        text-align: center;
    }
    
    .feature-detail.reverse {
        direction: ltr;
    }
    
    .feature-detail-content h2 {
        font-size: 28px;
    }
    
    .specs-grid {
        grid-template-columns: 1fr;
    }
    
    .advanced-features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-hero {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .about-highlights {
        justify-content: center;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
}

/* 关于我们 Section */
.about {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--background-light) 0%, #ffffff 100%);
}

.about-content {
    margin-top: 60px;
}

/* Hero Section */
.about-hero {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 8px 16px;
    border-radius: var(--border-radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.about-hero-text h3 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.2;
}

.about-hero-text p {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.about-highlights {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.highlight-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.highlight-number {
    font-size: 28px;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.highlight-text {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Globe Animation */
.about-globe {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    position: relative;
}

.globe-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.globe-text {
    font-size: 24px;
    font-weight: 900;
    color: white;
}

.orbit {
    position: absolute;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    animation: rotate 10s linear infinite;
}

.orbit-1 {
    width: 120%;
    height: 120%;
    top: -10%;
    left: -10%;
    animation-duration: 8s;
}

.orbit-2 {
    width: 140%;
    height: 140%;
    top: -20%;
    left: -20%;
    animation-duration: 12s;
}

.orbit-3 {
    width: 160%;
    height: 160%;
    top: -30%;
    left: -30%;
    animation-duration: 16s;
}

.orbit-dot {
    position: absolute;
    width: 32px;
    height: 32px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 12px;
    box-shadow: var(--shadow);
    top: -16px;
    left: -16px;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Values Section */
.about-values {
    margin-bottom: 80px;
}

.about-values h3 {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-primary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.value-card {
    background: white;
    padding: 40px 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    text-align: center;
}

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

.value-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

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

.value-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 15px;
}