/* 
 * 影视天堂 - 主样式表
 * 版本: 1.0.0
 * 移动优先响应式设计
 */

/* CSS变量定义 */
:root {
    --primary-color: #7c3aed;
    --primary-dark: #5b21b6;
    --primary-light: #a78bfa;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #252542;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border-color: #2d2d4a;
    --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(--bg-dark) 0%, #16162a 100%);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --font-primary: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* 重置样式 */
*, *::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: var(--font-primary);
    background: var(--gradient-dark);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--secondary-color);
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 24px;
    }
}

@media (min-width: 1200px) {
    .container {
        padding: 0 32px;
    }
}

/* 导航栏 - 非sticky */
.header {
    background: rgba(15, 15, 26, 0.95);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

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

@media (min-width: 992px) {
    .mobile-menu-btn {
        display: none;
    }
}

/* 导航菜单 */
.nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 8px;
    padding: 16px 0;
}

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

@media (min-width: 992px) {
    .nav-menu {
        display: flex;
        width: auto;
        flex-direction: row;
        gap: 24px;
        padding: 0;
    }
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 0;
    transition: color var(--transition-fast);
}

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

/* CTA按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

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

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

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

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

.btn-accent {
    background: var(--accent-color);
    color: var(--bg-dark);
}

.btn-accent:hover {
    background: #d97706;
    transform: translateY(-2px);
}

/* Hero区域 */
.hero {
    position: relative;
    padding: 48px 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: -1;
}

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

.hero-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }
}

@media (min-width: 1200px) {
    .hero-title {
        font-size: 3.5rem;
    }
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

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

@media (min-width: 576px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* 视频播放器区域 */
.video-player-section {
    padding: 48px 0;
    background: var(--bg-card);
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-wrapper img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.video-overlay:hover {
    background: rgba(0, 0, 0, 0.3);
}

.play-btn {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast);
}

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

.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 24px solid var(--text-primary);
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    margin-left: 6px;
}

/* 内容区块 */
.section {
    padding: 48px 0;
}

@media (min-width: 768px) {
    .section {
        padding: 64px 0;
    }
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .section-title {
        font-size: 2.25rem;
    }
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 视频卡片网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (min-width: 576px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (min-width: 768px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

@media (min-width: 1200px) {
    .video-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.video-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

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

.video-card-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.video-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.video-card:hover .video-card-image img {
    transform: scale(1.05);
}

.video-card-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--gradient-primary);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.video-card-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: var(--text-primary);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-card-content {
    padding: 16px;
}

.video-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.video-card-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-color);
}

/* 特色功能区 */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 576px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 关于我们 */
.about-section {
    background: var(--bg-card);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 992px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--primary-light);
}

.about-text p {
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 支付方式 */
.payment-section {
    padding: 48px 0;
}

.payment-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (min-width: 576px) {
    .payment-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .payment-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 992px) {
    .payment-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

.payment-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.payment-item:hover {
    border-color: var(--primary-color);
}

.payment-item img {
    height: 32px;
    margin: 0 auto 8px;
    object-fit: contain;
}

.payment-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* FAQ区域 */
.faq-section {
    background: var(--bg-card);
}

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

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
}

.faq-question {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-light);
    flex-shrink: 0;
}

.faq-item.active .faq-question::after {
    content: '−';
}

.faq-answer {
    display: none;
    padding-top: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

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

/* 用户评论 */
.reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 576px) {
    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .reviews-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

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

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

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

.review-rating {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}

.star {
    color: var(--accent-color);
    font-size: 1rem;
}

.star.empty {
    color: var(--text-muted);
}

.review-content {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.review-date {
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 客户支持 */
.support-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .support-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .support-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.support-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.support-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.support-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.support-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.support-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 标签页面 */
.tags-section {
    padding: 48px 0;
}

.tags-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.tag-item {
    background: var(--bg-card);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.tag-item:hover {
    background: var(--primary-color);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* 面包屑导航 */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

.breadcrumb-item a:hover {
    color: var(--primary-light);
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    color: var(--text-muted);
}

.breadcrumb-item:last-child {
    color: var(--primary-light);
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
}

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

@media (min-width: 576px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .footer-grid {
        grid-template-columns: 2fr repeat(3, 1fr);
    }
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

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

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

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

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

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--text-primary);
}

.footer-bottom {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

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

.footer-badges {
    display: flex;
    gap: 16px;
    align-items: center;
}

.age-badge {
    background: var(--error-color);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
}

.footer-payment {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-payment img {
    height: 24px;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.footer-payment img:hover {
    opacity: 1;
}

/* APP下载页面 */
.app-hero {
    padding: 64px 0;
    text-align: center;
}

.app-mockup {
    max-width: 300px;
    margin: 0 auto 32px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.app-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 600px;
    margin: 32px auto 0;
}

@media (min-width: 576px) {
    .app-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

.app-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
}

.app-feature-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    margin-top: 32px;
}

@media (min-width: 576px) {
    .download-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.download-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-card-hover);
}

.download-btn-icon {
    font-size: 28px;
}

.download-btn-text {
    text-align: left;
}

.download-btn-text small {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.download-btn-text span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 内容页面 */
.content-page {
    padding: 32px 0;
}

.content-header {
    margin-bottom: 32px;
}

.content-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .content-title {
        font-size: 2.25rem;
    }
}

.content-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.content-body {
    color: var(--text-secondary);
    line-height: 1.9;
}

.content-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 32px 0 16px;
    color: var(--text-primary);
}

.content-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 24px 0 12px;
    color: var(--primary-light);
}

.content-body p {
    margin-bottom: 16px;
}

.content-body ul,
.content-body ol {
    margin: 16px 0;
    padding-left: 24px;
}

.content-body li {
    margin-bottom: 8px;
}

.content-image {
    margin: 24px 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

/* 响应式工具类 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

/* 隐藏类 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* 懒加载图片占位 */
img[loading="lazy"] {
    background: var(--bg-card);
}

/* 打印样式 */
@media print {
    .header,
    .footer,
    .btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}