/* ========== 基础样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --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: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-vibrant: linear-gradient(135deg, #2563eb 0%, #8b5cf6 50%, #ec4899 100%);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
}

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

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

.nav-cta {
    background: var(--primary-color);
    color: white;
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

/* ========== 主标题区 ========== */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
    margin-top: 60px;
}

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

.hero-title {
    font-size: 56px;
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

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

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

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-vibrant);
    color: white;
    box-shadow: var(--shadow-lg);
}

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

.btn-large {
    padding: 20px 48px;
    font-size: 20px;
}

.cta-note {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 浏览器模拟 */
.browser-mockup {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.browser-header {
    background: #f3f4f6;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.browser-dots {
    display: flex;
    gap: 6px;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #e5e7eb;
}

.browser-dots span:nth-child(1) {
    background: #ef4444;
}

.browser-dots span:nth-child(2) {
    background: #f59e0b;
}

.browser-dots span:nth-child(3) {
    background: #10b981;
}

.browser-url {
    flex: 1;
    background: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-secondary);
}

.browser-content {
    padding: 32px;
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
    min-height: 300px;
}

.search-demo {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.search-query {
    background: var(--primary-color);
    color: white;
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 16px;
}

.search-results {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.result-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== 特性区 ========== */
.features {
    padding: 80px 0;
    background: var(--bg-white);
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    background: white;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

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

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

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

/* ========== 用户故事 ========== */
.stories {
    padding: 80px 0;
    background: var(--bg-light);
}

.stories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.story-card {
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.story-header {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.avatar {
    font-size: 48px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 50%;
}

.story-info h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.story-role {
    font-size: 14px;
    color: var(--text-secondary);
}

.story-content {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.story-highlight {
    background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    padding: 12px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    color: #92400e;
}

/* ========== Pro 会员福利 ========== */
.pro-benefits {
    padding: 80px 0;
    background: var(--gradient);
    color: white;
}

.pro-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.pro-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.pro-content h2 {
    font-size: 36px;
    margin-bottom: 12px;
}

.pro-content h3 {
    font-size: 42px;
    margin-bottom: 40px;
}

.benefits-list {
    list-style: none;
    display: inline-block;
    text-align: left;
    margin-top: 20px;
}

.benefits-list li {
    font-size: 18px;
    padding: 12px 0;
    margin-left: 20px;
}

/* ========== 对比表格 ========== */
.comparison {
    padding: 80px 0;
    background: white;
}

.comparison-table {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.comparison-header,
.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    border-bottom: 1px solid var(--border-color);
}

.comparison-header {
    background: var(--bg-light);
    font-weight: 700;
}

.comparison-cell {
    padding: 20px 24px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comparison-cell.feature-name {
    text-align: left;
    justify-content: flex-start;
    font-weight: 600;
}

.comparison-cell.highlight {
    background: linear-gradient(135deg, #ede9fe 0%, #e0f2fe 100%);
    color: var(--primary-color);
    font-weight: 600;
}

/* ========== 行动召唤 ========== */
.cta {
    padding: 100px 0;
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
}

.cta-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 42px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.cta-description {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 60px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 50px;
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-vibrant);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step p {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 16px;
}

.cta-footnote {
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== 常见问题 ========== */
.faq {
    padding: 80px 0;
    background: white;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    padding: 28px;
    background: var(--bg-light);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 16px;
}

.footer-section p {
    color: #9ca3af;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: #9ca3af;
    font-size: 14px;
    margin-bottom: 10px;
}

.disclaimer {
    font-size: 12px;
    opacity: 0.8;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 42px;
    }

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

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

@media (max-width: 768px) {
    .navbar .container {
        padding: 12px 20px;
    }

    .logo {
        font-size: 20px;
    }

    .nav-cta {
        padding: 8px 16px;
        font-size: 14px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .btn {
        padding: 14px 28px;
        font-size: 16px;
    }

    .btn-large {
        padding: 16px 32px;
        font-size: 18px;
    }

    .section-title {
        font-size: 32px;
    }

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

    .comparison-table {
        font-size: 14px;
    }

    .comparison-cell {
        padding: 16px 12px;
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .browser-content {
        padding: 20px;
    }

    .cta-content h2 {
        font-size: 28px;
    }

    .cta-description {
        font-size: 16px;
    }
}

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

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

.feature-card,
.story-card,
.faq-item {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }