/* 
 * 吃瓜大赛 主样式表
 * 自媒体视频创作平台
 * 移动优先响应式设计
 */

/* CSS变量定义 */
:root {
    --primary-color: #8b5cf6;
    --primary-dark: #7c3aed;
    --primary-light: #a78bfa;
    --secondary-color: #ec4899;
    --accent-color: #06b6d4;
    --background-dark: #0f0f23;
    --background-light: #1a1a2e;
    --surface-color: #16213e;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-dark: linear-gradient(180deg, var(--background-dark) 0%, var(--background-light) 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-primary);
    background: var(--gradient-dark);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 链接样式 */
a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover, a:focus {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* 图片响应式 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 列表重置 */
ul, ol {
    list-style: none;
}

/* 按钮重置 */
button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* 表单元素 */
input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ==================== 导航样式 ==================== */
.site-header {
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.main-nav {
    max-width: 1400px;
    margin: 0 auto;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
}

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

.site-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    z-index: 100;
}

.menu-bar {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-fast);
}

.nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem 0;
    background: var(--background-dark);
}

.nav-menu.active {
    display: flex;
}

.nav-item a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.nav-item a:hover,
.nav-item.active a {
    color: var(--text-primary);
    background: var(--surface-color);
    text-decoration: none;
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb-nav {
    padding: 1rem;
    background: var(--surface-color);
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breadcrumb-list li::after {
    content: "/";
    margin-left: 0.5rem;
    color: var(--border-color);
}

.breadcrumb-list li:last-child::after {
    display: none;
}

/* ==================== 主横幅区域 ==================== */
.hero-section {
    position: relative;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
}

.hero-banner {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.hero-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    filter: brightness(0.7);
}

.hero-content {
    padding: 2rem 1rem;
    text-align: center;
    background: var(--gradient-dark);
}

.hero-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.hero-description {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* CTA按钮 */
.cta-button {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    margin: 0.5rem;
}

.primary-cta {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
}

.primary-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--text-primary);
    text-decoration: none;
}

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

.secondary-cta:hover {
    background: var(--primary-color);
    color: var(--text-primary);
    text-decoration: none;
}

/* ==================== 通用区块样式 ==================== */
.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
}

/* ==================== 品牌介绍 ==================== */
.brand-intro {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
}

.intro-content p {
    margin-bottom: 1.25rem;
    text-indent: 2em;
    color: var(--text-secondary);
}

/* ==================== 视频种类 ==================== */
.video-categories {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.category-card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-normal);
    border: 1px solid var(--border-color);
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.category-info {
    padding: 1.25rem;
}

.category-info h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.category-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.rating-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

/* ==================== 视频播放模块 ==================== */
.video-showcase {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.video-player-container {
    max-width: 900px;
    margin: 0 auto 2rem;
}

.video-wrapper {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.main-video-player {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
}

.video-caption {
    padding: 1.25rem;
}

.video-caption h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.video-caption p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.video-thumbnails {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 900px;
    margin: 0 auto;
}

.thumb-item {
    background: var(--surface-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.thumb-item:hover {
    transform: scale(1.05);
}

.thumb-item img {
    width: 100%;
    height: 80px;
    object-fit: cover;
}

.thumb-item figcaption {
    padding: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* ==================== 明星合作模块 ==================== */
.star-collaboration {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.collaboration-showcase {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.star-project {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.star-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.star-info {
    padding: 1.5rem;
}

.star-info h3 {
    font-size: 1.125rem;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
}

.star-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 咨询模块 ==================== */
.contact-section {
    padding: 3rem 1rem;
    background: var(--gradient-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
}

.contact-info h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-item {
    font-size: 0.95rem;
}

.contact-item strong {
    display: block;
    color: var(--text-primary);
}

.contact-item span {
    color: rgba(255, 255, 255, 0.8);
}

.inquiry-form {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
}

.form-group {
    border: none;
}

.form-group legend {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.submit-btn {
    width: 100%;
    padding: 0.875rem;
    background: var(--text-primary);
    color: var(--primary-dark);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.submit-btn:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

/* ==================== 海外公关模块 ==================== */
.overseas-pr {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.pr-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.pr-image-wrapper {
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.pr-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.pr-info h3 {
    font-size: 1.25rem;
    color: var(--primary-light);
    margin-bottom: 1rem;
}

.pr-info p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.pr-features {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pr-features li {
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.pr-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ==================== 近期案例 ==================== */
.recent-cases {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.cases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.case-card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-5px);
}

.case-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.case-info {
    padding: 1.25rem;
}

.case-info h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.case-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.case-info time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==================== 关于我们 ==================== */
.about-us {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-content h3 {
    font-size: 1.25rem;
    color: var(--primary-light);
    margin: 2rem 0 1rem;
}

.about-content h3:first-child {
    margin-top: 0;
}

.about-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-indent: 2em;
    line-height: 1.9;
}

/* ==================== 支付方式 ==================== */
.payment-methods {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.payment-content {
    max-width: 900px;
    margin: 0 auto;
}

.payment-highlight {
    background: var(--gradient-primary);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
}

.payment-highlight h3 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.payment-highlight p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.payment-icons-wrapper {
    text-align: center;
    margin-bottom: 2rem;
}

.payment-icons-image {
    max-width: 400px;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.payment-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.payment-item {
    background: var(--surface-color);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.payment-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.payment-item span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==================== 制作资质 ==================== */
.producer-info {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.producer-content {
    max-width: 900px;
    margin: 0 auto;
}

.license-info {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.license-info h3 {
    font-size: 1.125rem;
    color: var(--primary-light);
    margin-bottom: 1rem;
}

.license-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.license-list li:last-child {
    border-bottom: none;
}

.license-list strong {
    color: var(--text-primary);
}

.license-badge {
    text-align: center;
    margin-bottom: 2rem;
}

.badge-image {
    width: 150px;
    height: 150px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    object-fit: cover;
}

.license-badge figcaption {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.compliance-statement {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.compliance-statement h3 {
    font-size: 1.125rem;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
}

.compliance-statement p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 负责任视频 ==================== */
.responsible-video {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.responsible-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.self-limit,
.help-resources {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.self-limit h3,
.help-resources h3 {
    font-size: 1.125rem;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
}

.self-limit p,
.help-resources p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 客户支持 ==================== */
.customer-support {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.support-content {
    max-width: 900px;
    margin: 0 auto;
}

.support-channels {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.support-item {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.support-item h3 {
    font-size: 1.1rem;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
}

.support-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== FAQ ==================== */
.faq-section {
    padding: 3rem 1rem;
    background: var(--background-dark);
}

.faq-content {
    max-width: 900px;
    margin: 0 auto;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-question {
    background: var(--surface-color);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-bottom: none;
}

.faq-answer {
    background: var(--background-light);
    padding: 1rem 1.25rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    border: 1px solid var(--border-color);
    border-top: none;
    margin-bottom: 0.5rem;
}

/* ==================== 用户评论 ==================== */
.user-reviews {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.reviews-content {
    max-width: 900px;
    margin: 0 auto;
}

.reviews-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.review-item {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.review-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.review-header strong {
    font-size: 1rem;
    color: var(--text-primary);
}

.review-location {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.review-rating {
    background: var(--gradient-primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.review-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
    padding: 0;
    border: none;
    font-style: normal;
}

.review-date {
    display: block;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==================== 页脚 ==================== */
.site-footer {
    background: var(--background-dark);
    border-top: 1px solid var(--border-color);
    padding: 3rem 1rem 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.footer-section h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.contact-address {
    font-style: normal;
}

.contact-address p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.social-links a {
    padding: 0.5rem 1rem;
    background: var(--surface-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--text-primary);
    text-decoration: none;
}

.footer-payment img {
    margin-top: 1rem;
    max-width: 180px;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.legal-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.legal-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==================== 内页通用样式 ==================== */
.page-hero {
    padding: 3rem 1rem;
    background: var(--gradient-primary);
    text-align: center;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.page-description {
    font-size: 1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: 3rem 1rem;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.content-wrapper h2 {
    font-size: 1.5rem;
    color: var(--primary-light);
    margin: 2rem 0 1rem;
}

.content-wrapper h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.content-wrapper p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.9;
    text-indent: 2em;
}

.content-image {
    margin: 2rem 0;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.content-image img {
    width: 100%;
    height: auto;
}

.content-image figcaption {
    padding: 0.75rem;
    background: var(--surface-color);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

/* 视频列表样式 */
.video-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 2rem 0;
}

.video-card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.video-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.video-card-content {
    padding: 1.25rem;
}

.video-card-content h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 0 0 0.75rem;
}

.video-card-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    text-indent: 0;
}

/* APP下载页面样式 */
.download-hero {
    padding: 3rem 1rem;
    background: var(--gradient-primary);
    text-align: center;
}

.app-preview {
    max-width: 300px;
    margin: 2rem auto;
}

.app-preview img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    margin-top: 2rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-weight: 600;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--text-primary);
}

.app-features {
    padding: 3rem 1rem;
    background: var(--background-light);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.feature-item {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    text-align: center;
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feature-item h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==================== 媒体查询 - 平板 ==================== */
@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
        width: auto;
        flex-direction: row;
        padding: 0;
        background: transparent;
        gap: 0.25rem;
    }
    
    .nav-item a {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    .hero-image {
        height: 400px;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .collaboration-showcase {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .pr-content {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .payment-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .responsible-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .support-channels {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reviews-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .video-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==================== 媒体查询 - 桌面 ==================== */
@media (min-width: 1024px) {
    .nav-item a {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .hero-section {
        min-height: 70vh;
    }
    
    .hero-image {
        height: 500px;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-content {
        padding: 3rem 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .video-list {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ==================== 媒体查询 - 大屏 ==================== */
@media (min-width: 1280px) {
    .hero-image {
        height: 600px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .site-header,
    .site-footer,
    .cta-button,
    .mobile-menu-toggle {
        display: none;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
}

/* ==================== 无障碍优化 ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 焦点样式 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 跳过链接 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--text-primary);
    padding: 8px;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}