/* 基础重置和变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 参考Pingo AI的配色方案 */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #8b5cf6;
    --secondary-color: #f59e0b;
    --accent-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --background-primary: #ffffff;
    --background-secondary: #f9fafb;
    --background-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
}

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

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

/* 导航栏 */
.navbar {
    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;
    transition: all 0.3s ease;
}

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

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: transform 0.2s ease;
}

.logo-link:hover {
    transform: scale(1.05);
}

.logo-text {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-oo {
    color: var(--primary-color);
    position: relative;
}

.logo-oo::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.download-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
    min-width: 600px;
    white-space: nowrap;
}

.brand-name {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.greeting {
    font-size: 2rem;
    color: var(--secondary-color);
    font-weight: 600;
    margin-top: 10px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.supported-languages {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.language-tag {
    background: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

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

.phone-mockup {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1f2937, #374151);
    border-radius: 30px;
    padding: 10px;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 20px;
    padding: 20px;
    overflow: hidden;
}

.chat-interface {
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chat-message {
    display: flex;
    align-items: flex-end;
    gap: 12px;
}

.chat-message.user {
    flex-direction: row-reverse;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.ai-avatar {
    background: var(--gradient-primary);
}

.user-avatar {
    background: var(--gradient-secondary);
}

.message {
    background: var(--background-secondary);
    padding: 12px 16px;
    border-radius: 18px;
    max-width: 200px;
    font-size: 14px;
    line-height: 1.4;
}

.chat-message.user .message {
    background: var(--primary-color);
    color: white;
}

.voice-indicator {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: auto;
}

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

.wave:nth-child(2) {
    animation-delay: 0.2s;
}

.wave:nth-child(3) {
    animation-delay: 0.4s;
}

/* 核心价值主张 */
.value-proposition {
    padding: 80px 0;
    background: var(--background-primary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.value-item {
    text-align: center;
    padding: 40px 20px;
}

.value-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.value-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

/* 功能特色 */
.features {
    padding: 80px 0;
    background: var(--background-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
}

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

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

/* 学习场景 */
.scenarios {
    padding: 80px 0;
    background: var(--background-primary);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.scenario-card {
    background: white;
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.scenario-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.scenario-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    display: inline-block;
    margin-bottom: 16px;
}

.scenario-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.scenario-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* AI反馈系统 */
.ai-feedback {
    padding: 80px 0;
    background: var(--background-secondary);
}

.feedback-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.feedback-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.feedback-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.feedback-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.feedback-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.feedback-item i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.feedback-visual {
    display: flex;
    justify-content: center;
}

.feedback-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.feedback-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.score-item span:first-child {
    flex: 1;
    font-size: 14px;
    color: var(--text-secondary);
}

.score-bar {
    flex: 2;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.score-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 0.8s ease;
}

.score-item span:last-child {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 40px;
}

.improvement-tip {
    background: #fef3c7;
    padding: 16px;
    border-radius: 8px;
    margin-top: 20px;
    font-size: 14px;
    color: #92400e;
    border-left: 4px solid var(--secondary-color);
}

/* 个性化课程 */
.personalized-lessons {
    padding: 80px 0;
    background: var(--background-primary);
    text-align: center;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.lesson-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.lesson-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
}

.lesson-quote {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.6;
}

.lesson-quote::before,
.lesson-quote::after {
    content: '"';
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
}

/* 全球社区 */
.community {
    padding: 100px 0;
    background: var(--background-secondary) !important;
    position: relative;
    overflow: hidden;
}


.community .container {
    position: relative;
    z-index: 1;
}

.community .section-title {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.community .section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 80px;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.community-features {
    margin-bottom: 80px;
}

.community-feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 60px;
    padding: 40px 0;
}

.community-feature:last-child {
    margin-bottom: 0;
}

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

.community-feature.reverse > * {
    direction: ltr;
}

.feature-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-highlights {
    list-style: none;
}

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

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

/* 演示组件通用样式 */
.feature-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 语音朋友圈演示 */
.voice-post-demo {
    background: white;
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    max-width: 380px;
    width: 100%;
    border: 1px solid rgba(99, 102, 241, 0.1);
    transition: all 0.3s ease;
}

.voice-post-demo:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

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

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.user-info {
    display: flex;
    flex-direction: column;
}

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

.location {
    font-size: 12px;
    color: var(--text-light);
}

.voice-content {
    margin-bottom: 16px;
}

.voice-wave-demo {
    display: flex;
    align-items: center;
    gap: 3px;
    margin-bottom: 12px;
    padding: 12px;
    background: var(--background-secondary);
    border-radius: 8px;
}

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

.wave-bar:nth-child(2) { animation-delay: 0.2s; }
.wave-bar:nth-child(3) { animation-delay: 0.4s; }
.wave-bar:nth-child(4) { animation-delay: 0.6s; }
.wave-bar:nth-child(5) { animation-delay: 0.8s; }

.voice-content p {
    color: var(--text-secondary);
    font-style: italic;
    margin: 0;
}

.post-actions {
    display: flex;
    gap: 12px;
}

.action-btn {
    background: var(--background-secondary);
    border: none;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* 挑战赛演示 */
.challenge-demo {
    background: white;
    border-radius: 20px;
    padding: 28px;
    box-shadow: var(--shadow-lg);
    max-width: 380px;
    width: 100%;
    border: 1px solid rgba(16, 185, 129, 0.1);
    transition: all 0.3s ease;
}

.challenge-demo:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.challenge-header h4 {
    margin: 0;
    color: var(--text-primary);
}

.challenge-badge {
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.challenge-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.challenge-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
}

.stat {
    text-align: center;
}

.stat .number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat .label {
    font-size: 12px;
    color: var(--text-light);
}

.top-participants {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.participant {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.participant .rank {
    font-size: 18px;
}

.participant .name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.participant .votes {
    font-size: 12px;
    color: var(--text-light);
}

/* 纠错演示 */
.correction-demo {
    background: white;
    border-radius: 20px;
    padding: 28px;
    box-shadow: var(--shadow-lg);
    max-width: 380px;
    width: 100%;
    border: 1px solid rgba(245, 158, 11, 0.1);
    transition: all 0.3s ease;
}

.correction-demo:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.message-bubble {
    padding: 12px 16px;
    border-radius: 18px;
    margin-bottom: 12px;
    max-width: 280px;
}

.message-bubble.user {
    background: var(--primary-color);
    color: white;
    margin-left: auto;
}

.message-bubble.helper {
    background: var(--background-secondary);
    color: var(--text-primary);
}

.correction-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 12px 0;
}

.correction-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.helper-name {
    font-weight: 600;
    font-size: 14px;
}

.correction-badge {
    background: var(--accent-color);
    color: white;
    padding: 2px 8px;
    border-radius: 8px;
    font-size: 10px;
}

.correction {
    background: var(--secondary-color);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.explanation {
    font-size: 12px;
    color: var(--text-light);
    margin: 8px 0 0 0;
}

/* 社区统计 */
.community-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 80px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 24px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);
    padding: 32px 24px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(99, 102, 241, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

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

/* 社区CTA */
.community-cta {
    text-align: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    padding: 60px 40px;
    border-radius: 24px;
    border: 1px solid rgba(99, 102, 241, 0.2);
    position: relative;
    overflow: hidden;
}

.community-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

.community-cta h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 32px;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.community-join-btn {
    font-size: 1.125rem;
    padding: 18px 36px;
    border-radius: 50px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

.community-join-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* 用户评价 */
.testimonials {
    padding: 80px 0;
    background: var(--background-primary);
    text-align: center;
}

.testimonial-stat {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 50px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    text-align: left;
}

.stars {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.testimonial-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
    font-style: italic;
}

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

.testimonial-author span {
    color: var(--text-light);
    font-size: 14px;
    display: block;
    margin-top: 4px;
}

/* 价格方案 */
.pricing {
    padding: 80px 0;
    background: var(--background-primary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

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

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

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

.pricing-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.price span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.price-with-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

.save-badge {
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
    white-space: nowrap;
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    padding: 12px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    padding-left: 24px;
}

.pricing-features li:last-child {
    border-bottom: none;
}

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

.pricing-btn {
    width: 100%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* FAQ */
.faq {
    padding: 80px 0;
    background: var(--background-secondary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
}

.faq-item {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.faq-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

/* CTA区域 */
.cta {
    padding: 80px 0;
    background: var(--gradient-primary);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

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

.cta .btn-primary:hover {
    background: var(--background-secondary);
}


/* 页脚 */
.footer {
    background: var(--background-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand .logo-oo {
    color: var(--primary-light);
}

.footer-brand p {
    color: #9ca3af;
    margin-top: 16px;
    font-style: italic;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-column a {
    display: block;
    color: #9ca3af;
    text-decoration: none;
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    color: #9ca3af;
    font-size: 14px;
}

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

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

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.2rem;
        min-width: auto;
        white-space: normal;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .feedback-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feedback-features {
        grid-template-columns: 1fr;
    }
    
    .value-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .community-feature {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
        margin-bottom: 60px;
        padding: 20px 0;
    }
    
    .community-feature.reverse {
        direction: ltr;
    }
    
    .community-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        padding: 30px 20px;
    }
    
    .community-cta {
        padding: 40px 20px;
    }
    
    .community-cta h3 {
        font-size: 1.5rem;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cta h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 1.8rem;
        min-width: auto;
        white-space: normal;
    }
    
    .greeting {
        font-size: 1.5rem;
    }
    
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .community-stats {
        grid-template-columns: 1fr;
        padding: 20px 15px;
    }
    
    .stat-card {
        padding: 24px 16px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .supported-languages {
        justify-content: center;
    }
    
    .language-tag {
        font-size: 12px;
        padding: 6px 12px;
    }
}