/* 国产 全新原创样式表 */
/* 网站：abtnfs.cn */

/* ========== 基础重置与变量 ========== */
:root {
    --primary: #FF6B8A;
    --primary-dark: #E85577;
    --secondary: #FFB347;
    --accent: #7C3AED;
    --dark: #1A1A2E;
    --light: #F8F9FA;
    --gray: #6B7280;
    --gray-light: #E5E7EB;
    --success: #10B981;
    --gradient-main: linear-gradient(135deg, #FF6B8A 0%, #FFB347 100%);
    --gradient-purple: linear-gradient(135deg, #7C3AED 0%, #EC4899 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 头部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo img {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
}

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

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu li a {
    display: block;
    padding: 10px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--dark);
    border-radius: var(--radius-xl);
    transition: var(--transition);
}

.nav-menu li a:hover,
.nav-menu li a.active {
    background: var(--gradient-main);
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

/* ========== 搜索栏 ========== */
.search-section {
    background: linear-gradient(180deg, #fff 0%, var(--light) 100%);
    padding: 90px 0 20px;
}

.search-box {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 16px 60px 16px 24px;
    font-size: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-xl);
    background: #fff;
    transition: var(--transition);
    outline: none;
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255,107,138,0.15);
}

.search-box button {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--gradient-main);
    border: none;
    color: #fff;
    padding: 12px 24px;
    border-radius: var(--radius-xl);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    transform: translateY(-50%) scale(1.02);
    box-shadow: var(--shadow-md);
}

/* ========== 英雄区域 ========== */
.hero {
    padding: 30px 0 60px;
    background: linear-gradient(180deg, var(--light) 0%, #fff 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content h1 .highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--gray);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255,107,138,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255,107,138,0.5);
}

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

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.hero-visual {
    position: relative;
}

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

.hero-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.hero-stats {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
}

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
}

/* ========== 通用区块 ========== */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--light);
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.section-header h2 .highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 视频卡片 ========== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

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

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

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.play-btn::after {
    content: "";
    width: 0;
    height: 0;
    border-left: 18px solid var(--primary);
    border-top: 11px solid transparent;
    border-bottom: 11px solid transparent;
    margin-left: 4px;
}

.video-card:hover .play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.video-info {
    padding: 18px;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--gray);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-tags {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 10px;
    background: var(--light);
    color: var(--gray);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.tag-hot {
    background: linear-gradient(135deg, #FF6B8A 0%, #FFB347 100%);
    color: #fff;
}

/* ========== 分类导航 ========== */
.category-nav {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.category-btn {
    padding: 10px 24px;
    background: #fff;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-xl);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.category-btn:hover,
.category-btn.active {
    background: var(--gradient-main);
    border-color: transparent;
    color: #fff;
}

/* ========== 特色功能 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fff;
    padding: 35px 30px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: var(--gradient-main);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--gray);
    line-height: 1.7;
}

/* ========== 专家团队 ========== */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.expert-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.expert-img {
    height: 280px;
    overflow: hidden;
}

.expert-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.expert-info {
    padding: 25px;
}

.expert-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.expert-title {
    font-size: 0.9rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.expert-desc {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 15px;
    line-height: 1.6;
}

.expert-btns {
    display: flex;
    gap: 10px;
}

.expert-btns .btn {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* ========== 用户评价 ========== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.review-card {
    background: #fff;
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.review-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.review-user h4 {
    font-size: 1rem;
    font-weight: 600;
}

.review-user span {
    font-size: 0.85rem;
    color: var(--gray);
}

.review-stars {
    color: #FFB347;
    font-size: 1rem;
    margin-bottom: 12px;
}

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

/* ========== 合作品牌 ========== */
.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
    padding: 30px 0;
}

.partner-logo {
    height: 40px;
    opacity: 0.6;
    filter: grayscale(100%);
    transition: var(--transition);
}

.partner-logo:hover {
    opacity: 1;
    filter: grayscale(0%);
}

/* ========== 联系信息 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.contact-card {
    background: #fff;
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.contact-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: var(--light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-text strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 3px;
}

.contact-text span {
    font-size: 0.9rem;
    color: var(--gray);
}

.qrcode-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 15px;
}

.qrcode-item {
    text-align: center;
}

.qrcode-item img {
    width: 120px;
    height: 120px;
    margin: 0 auto 10px;
    border-radius: var(--radius-sm);
}

.qrcode-item p {
    font-size: 0.85rem;
    color: var(--gray);
}

/* ========== FAQ ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius-md);
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--light);
}

.faq-question span:last-child {
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.faq-item.active .faq-question span:last-child {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 25px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--gray);
    line-height: 1.7;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--dark);
    color: #fff;
    padding: 60px 0 30px;
}

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

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand .logo-text {
    color: #fff;
    background: none;
    -webkit-text-fill-color: #fff;
}

.footer-brand p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-links h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-links ul li a {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--gradient-main);
}

/* ========== 面包屑 ========== */
.breadcrumb {
    padding: 100px 0 20px;
    background: var(--light);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.breadcrumb-list li a {
    color: var(--gray);
}

.breadcrumb-list li a:hover {
    color: var(--primary);
}

.breadcrumb-list li::after {
    content: "/";
    margin-left: 10px;
    color: var(--gray-light);
}

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

.breadcrumb-list li:last-child {
    color: var(--dark);
    font-weight: 500;
}

/* ========== 页面头部 ========== */
.page-header {
    background: linear-gradient(135deg, #FF6B8A 0%, #FFB347 100%);
    padding: 50px 0;
    text-align: center;
    color: #fff;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ========== 工具卡片 ========== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.tool-card {
    background: #fff;
    padding: 30px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid transparent;
}

.tool-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.tool-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--gradient-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
}

.tool-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 20px;
}

/* ========== 社区帖子 ========== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

.post-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.post-card:hover {
    box-shadow: var(--shadow-md);
}

.post-img {
    height: 200px;
    overflow: hidden;
}

.post-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.post-content {
    padding: 20px;
}

.post-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.post-excerpt {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 15px;
    line-height: 1.6;
}

.post-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--gray);
}

/* ========== 动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-btns {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .search-box input {
        padding-right: 100px;
    }
    
    .search-box button {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

/* ========== 懒加载占位 ========== */
.lazy-load {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}