/* 
 * 龙猫云机场官方网站全局样式表
 * 风格：现代极简淡雅灰 (Soft Gray & Indigo Accents)
 * 采用 CSS 变量与响应式网格系统，提供流畅微动效
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-base: #f6f8fa;
    --bg-card: #ffffff;
    --bg-card-hover: #fafbfc;
    --primary: #1e293b;
    --primary-light: #334155;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
    --accent-light: rgba(79, 70, 229, 0.08);
    --text-main: #334155;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --success: #10b981;
    --max-width: 1200px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.02);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.02);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.04);
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: --text-main;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 容器与布局 */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem auto;
}

/* 链接与排版 */
a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-dark);
    font-weight: 600;
    line-height: 1.25;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 6px 15px rgba(79, 70, 229, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-base);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-outline:hover {
    background-color: var(--accent);
    color: #ffffff;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 玻璃折射顶部导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    height: 70px;
    display: flex;
    align-items: center;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
}

.nav-logo-icon {
    font-size: 1.5rem;
    margin-right: 0.5rem;
}

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

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
}

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

.nav-cta {
    display: flex;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
}

/* 首屏 Hero Section */
.hero {
    padding: 8rem 0 5rem 0;
    background: radial-gradient(circle at top right, rgba(79, 70, 229, 0.03) 0%, rgba(246, 248, 250, 0) 60%);
    display: flex;
    align-items: center;
    min-height: 85vh;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    background-color: var(--accent-light);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-tag span {
    width: 6px;
    height: 6px;
    background-color: var(--accent);
    border-radius: 50%;
    margin-right: 8px;
    animation: pulse 1.5s infinite;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.hero-title span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.stat-item h4 {
    font-size: 1.75rem;
    color: var(--accent);
    font-weight: 700;
}

.stat-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(226, 232, 240, 0.8);
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-card-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.hero-card-brand {
    font-weight: 700;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-card-status {
    color: var(--success);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

.hero-card-status::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
}

.speed-meter {
    margin-top: 1rem;
}

.speed-bar-bg {
    width: 100%;
    height: 8px;
    background-color: var(--bg-base);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.speed-bar-fill {
    height: 100%;
    background: var(--accent-gradient);
    width: 96%;
}

.hero-bg-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.15) 0%, rgba(255,255,255,0) 70%);
    z-index: 1;
    top: -50px;
    right: -50px;
}

/* 核心优势 */
.advantages {
    background-color: var(--bg-card);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.adv-card {
    background-color: var(--bg-base);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.adv-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    background: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.adv-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.adv-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 套餐与价格 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    align-items: stretch;
    margin-bottom: 4rem;
}

.price-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    position: relative;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.price-card.popular {
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-xl);
    transform: scale(1.03);
}

.price-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    color: #ffffff;
    padding: 0.25rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.price-header h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.price-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.price-value-container {
    display: flex;
    align-items: baseline;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.price-val {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-dark);
}

.price-unit {
    color: var(--text-muted);
    margin-left: 0.25rem;
    font-size: 0.95rem;
}

.price-features {
    list-style: none;
    margin-bottom: 2.5rem;
    flex-grow: 1;
}

.price-features li {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.price-features li svg {
    width: 18px;
    height: 18px;
    fill: var(--success);
    margin-right: 10px;
    flex-shrink: 0;
}

.price-cta {
    width: 100%;
}

/* 价格对比表 */
.pricing-table-container {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow-x: auto;
}

.pricing-table-container h3 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 700px;
}

.pricing-table th, .pricing-table td {
    padding: 1.25rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
    font-weight: 700;
    color: var(--text-dark);
    background-color: var(--bg-base);
}

.pricing-table tr:hover td {
    background-color: var(--bg-base);
}

.pricing-table td.highlight {
    font-weight: 700;
    color: var(--accent);
}

/* 适合人群 */
.audience {
    background-color: var(--bg-card);
}

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

.audience-img-wrapper {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.audience-img-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.audience-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.audience-item {
    display: flex;
    gap: 1.5rem;
}

.audience-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.audience-content h4 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

.audience-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 客户端下载与教程汇总 */
.tutorials-hub {
    background-color: var(--bg-base);
}

.tutorials-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 0.75rem 2rem;
    border-radius: 50px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.tab-content {
    display: none;
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 3rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

.tut-content-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
}

.tut-left h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.tut-left p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.tut-steps {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.tut-step {
    display: flex;
    gap: 1.25rem;
}

.step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--accent);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 3px;
}

.step-info h4 {
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

.step-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.tut-right {
    background-color: var(--bg-base);
    border-radius: 12px;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
}

.tut-sub-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-card);
    border-radius: 8px;
    border: 1px dashed var(--border-hover);
    text-align: center;
}

.tut-sub-box h4 {
    margin-bottom: 0.5rem;
}

/* 用户评价 */
.testimonials {
    background-color: var(--bg-card);
}

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

.test-card {
    background-color: var(--bg-base);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    position: relative;
}

.test-rating {
    color: #f59e0b;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.test-text {
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.test-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.test-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--border-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-dark);
}

.test-author-info h4 {
    font-size: 0.95rem;
    color: var(--text-dark);
}

.test-author-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 常见问题 (FAQ) 折叠面板 */
.faq {
    background-color: var(--bg-base);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background-color: var(--bg-card);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
}

.faq-icon {
    font-size: 1.5rem;
    transition: var(--transition);
    color: var(--text-muted);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding: 0 1.5rem;
    color: var(--text-main);
    font-size: 0.95rem;
}

.faq-answer p {
    padding-bottom: 1.5rem;
}

.faq-item.active {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent);
}

.faq-item.active .faq-answer {
    max-height: 250px;
}

/* 文章目录 */
.articles-dir {
    background-color: var(--bg-card);
}

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

.article-card {
    background-color: var(--bg-base);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

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

.article-card-body {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    gap: 1rem;
}

.article-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
    color: var(--text-dark);
}

.article-card h3 a:hover {
    color: var(--accent);
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.article-link:hover {
    color: var(--accent-hover);
}

/* 独立文章详情页布局 */
.article-page {
    padding: 8rem 0 5rem 0;
}

.article-layout {
    display: grid;
    grid-template-columns: 2.5fr 1fr;
    gap: 3.5rem;
    align-items: start;
}

.article-post {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 3.5rem 3rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.article-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
    margin-bottom: 2.5rem;
}

.article-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    line-height: 1.25;
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-main);
}

.article-content h2 {
    font-size: 1.6rem;
    margin: 2.5rem 0 1rem 0;
    border-bottom: 2px solid var(--bg-base);
    padding-bottom: 0.5rem;
}

.article-content h3 {
    font-size: 1.25rem;
    margin: 1.75rem 0 0.75rem 0;
}

.article-content p {
    margin-bottom: 1.5rem;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content blockquote {
    border-left: 4px solid var(--accent);
    background-color: var(--bg-base);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    border-radius: 0 8px 8px 0;
}

.article-content strong {
    color: var(--text-dark);
}

/* 侧边栏 */
.sidebar {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.widget {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.widget-title {
    font-size: 1.15rem;
    margin-bottom: 1.25rem;
    border-left: 4px solid var(--accent);
    padding-left: 10px;
    font-weight: 700;
}

.widget-cta {
    text-align: center;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
}

.widget-cta-gradient {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
}

.widget-cta-gradient h3 {
    color: #ffffff;
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.widget-cta-gradient p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.widget-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.widget-links li a {
    font-size: 0.95rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-main);
    padding: 0.25rem 0;
}

.widget-links li a:hover {
    color: var(--accent);
}

/* 页脚 */
.footer {
    background-color: var(--primary);
    color: rgba(255, 255, 255, 0.7);
    padding: 5rem 0 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand h3 {
    color: #ffffff;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand p {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.footer-section h4 {
    color: #ffffff;
    font-size: 1rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.footer-legal-links {
    display: flex;
    gap: 1.5rem;
}

.footer-legal-links a:hover {
    color: #ffffff;
}

/* 动效 */
@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.5; }
    50% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.5; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式媒体查询 */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-stats {
        justify-content: center;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        max-width: 450px;
        margin: 0 auto 3rem auto;
    }
    .price-card.popular {
        transform: scale(1);
    }
    .audience-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .tut-content-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .test-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .article-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    section {
        padding: 3.5rem 0;
    }
    .navbar {
        height: 60px;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-lg);
    }
    .nav-links.active {
        display: flex;
    }
    .nav-cta {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .hero-title {
        font-size: 2.25rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    .articles-grid {
        grid-template-columns: 1fr;
        max-width: 450px;
        margin: 0 auto;
    }
    .article-post {
        padding: 2rem 1.5rem;
    }
    .article-header h1 {
        font-size: 1.75rem;
    }
}