/* 
 * budin-edu.com 全新原创样式
 * 91视频在线观看18 - 专业视频分享平台
 * 设计风格：深蓝霓虹 + 玻璃拟态
 * 创建时间：2025-12-19
 */

/* CSS变量定义 */
:root {
    --neon-blue: #00f0ff;
    --neon-pink: #ff00e5;
    --neon-purple: #9d00ff;
    --bg-primary: #080c1a;
    --bg-secondary: #0d1228;
    --bg-card: #111633;
    --bg-glass: rgba(17, 22, 51, 0.8);
    --text-white: #ffffff;
    --text-gray: #8b95b0;
    --text-dim: #5a6380;
    --border-glow: rgba(0, 240, 255, 0.3);
    --gradient-neon: linear-gradient(135deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    --gradient-dark: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    --glow-blue: 0 0 30px rgba(0, 240, 255, 0.4);
    --glow-pink: 0 0 30px rgba(255, 0, 229, 0.4);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 50px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.35s ease;
}

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

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

body {
    font-family: 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-white);
    line-height: 1.65;
    overflow-x: hidden;
    min-height: 100vh;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

/* 容器 */
.wrapper {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 顶部导航 ========== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: rgba(8, 12, 26, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glow);
}

.nav-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.brand-icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-neon);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.1rem;
    color: #fff;
    box-shadow: var(--glow-blue);
}

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

.nav-menu {
    display: flex;
    gap: 36px;
}

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-gray);
    padding: 6px 0;
    position: relative;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-neon);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--neon-blue);
}

.nav-menu a:hover::before,
.nav-menu a.active::before {
    width: 100%;
}

.nav-search {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-full);
    padding: 6px 6px 6px 18px;
    transition: var(--transition-normal);
}

.nav-search:focus-within {
    border-color: var(--neon-blue);
    box-shadow: var(--glow-blue);
}

.nav-search input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-white);
    font-size: 0.9rem;
    width: 180px;
}

.nav-search input::placeholder {
    color: var(--text-dim);
}

.nav-search button {
    background: var(--gradient-neon);
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.nav-search button:hover {
    transform: scale(1.1);
}

/* ========== 搜索横幅 ========== */
.search-hero {
    padding: 100px 24px 30px;
    background: var(--gradient-dark);
}

.search-box {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
}

.search-box input {
    flex: 1;
    background: var(--bg-card);
    border: 2px solid var(--border-glow);
    border-radius: var(--radius-full);
    padding: 16px 28px;
    color: var(--text-white);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-normal);
}

.search-box input:focus {
    border-color: var(--neon-blue);
    box-shadow: var(--glow-blue);
}

.search-box button {
    background: var(--gradient-neon);
    color: #fff;
    padding: 16px 36px;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition-normal);
}

.search-box button:hover {
    transform: translateY(-3px);
    box-shadow: var(--glow-blue);
}

/* ========== 主视觉区 ========== */
.main-hero {
    padding: 50px 24px 80px;
    text-align: center;
    background: radial-gradient(ellipse at center top, rgba(0, 240, 255, 0.08) 0%, transparent 60%);
}

.hero-inner {
    max-width: 880px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 36px;
}

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

.btn-glow {
    background: var(--gradient-neon);
    color: #fff;
    padding: 15px 36px;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-normal);
}

.btn-glow:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow-blue);
}

.btn-ghost {
    background: transparent;
    color: var(--neon-blue);
    padding: 15px 36px;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid var(--neon-blue);
    transition: var(--transition-normal);
}

.btn-ghost:hover {
    background: var(--neon-blue);
    color: var(--bg-primary);
}

/* ========== 视频区块 ========== */
.video-block {
    padding: 70px 24px;
    background: var(--bg-primary);
}

.block-header {
    text-align: center;
    margin-bottom: 45px;
}

.block-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.block-title em {
    font-style: normal;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.block-desc {
    color: var(--text-gray);
    font-size: 1rem;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-item {
    background: var(--bg-card);
    color: var(--text-gray);
    padding: 11px 26px;
    border-radius: var(--radius-full);
    font-size: 0.92rem;
    border: 1px solid transparent;
    transition: var(--transition-normal);
}

.tab-item:hover,
.tab-item.on {
    background: var(--gradient-neon);
    color: #fff;
    border-color: transparent;
}

/* 视频网格 */
.video-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
    max-width: 1440px;
    margin: 0 auto;
}

.video-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(0, 240, 255, 0.1);
    transition: var(--transition-normal);
}

.video-item:hover {
    transform: translateY(-10px);
    border-color: var(--neon-blue);
    box-shadow: var(--glow-blue);
}

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

.video-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.video-item:hover .video-cover img {
    transform: scale(1.12);
}

.video-time {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 500;
}

.play-mask {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.video-item:hover .play-mask {
    opacity: 1;
}

.play-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-neon);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--glow-blue);
    transform: scale(0.85);
    transition: var(--transition-normal);
}

.video-item:hover .play-icon {
    transform: scale(1);
}

.play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 22px solid #fff;
    border-top: 13px solid transparent;
    border-bottom: 13px solid transparent;
    margin-left: 5px;
}

.video-detail {
    padding: 18px;
}

.video-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-stats {
    display: flex;
    justify-content: space-between;
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ========== 特色功能 ========== */
.feature-block {
    padding: 80px 24px;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
    max-width: 1440px;
    margin: 0 auto;
}

.feature-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    text-align: center;
    border: 1px solid var(--border-glow);
    transition: var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-8px);
    border-color: var(--neon-pink);
    box-shadow: var(--glow-pink);
}

.feature-icon {
    width: 72px;
    height: 72px;
    background: var(--gradient-neon);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 22px;
    font-size: 2rem;
}

.feature-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 14px;
}

.feature-text {
    color: var(--text-gray);
    font-size: 0.92rem;
    line-height: 1.65;
}

/* ========== 专家团队 ========== */
.team-block {
    padding: 80px 24px;
    background: var(--bg-primary);
}

.team-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
    max-width: 1440px;
    margin: 0 auto;
}

.team-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid rgba(0, 240, 255, 0.1);
    transition: var(--transition-normal);
}

.team-card:hover {
    transform: translateY(-8px);
    border-color: var(--neon-purple);
}

.team-photo {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 20px;
    border: 3px solid var(--neon-blue);
    box-shadow: var(--glow-blue);
}

.team-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.team-role {
    color: var(--neon-blue);
    font-size: 0.9rem;
    margin-bottom: 14px;
}

.team-intro {
    color: var(--text-gray);
    font-size: 0.88rem;
    line-height: 1.6;
}

/* ========== 社区展示 ========== */
.gallery-block {
    padding: 80px 24px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 1440px;
    margin: 0 auto;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 1;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-item:hover img {
    transform: scale(1.15);
}

.gallery-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 18px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
    color: #fff;
    font-size: 0.92rem;
    font-weight: 500;
    transform: translateY(100%);
    transition: var(--transition-normal);
}

.gallery-item:hover .gallery-label {
    transform: translateY(0);
}

/* ========== 用户评价 ========== */
.review-block {
    padding: 80px 24px;
    background: var(--bg-primary);
}

.review-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
    max-width: 1440px;
    margin: 0 auto;
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid rgba(0, 240, 255, 0.1);
}

.review-top {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.review-face {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    overflow: hidden;
}

.review-face img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.review-info {
    flex: 1;
}

.review-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.review-date {
    font-size: 0.82rem;
    color: var(--text-dim);
}

.review-stars {
    color: #fbbf24;
    font-size: 1rem;
}

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

/* ========== 合作伙伴 ========== */
.partner-block {
    padding: 60px 24px;
    background: var(--bg-secondary);
}

.partner-list {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
    max-width: 1440px;
    margin: 0 auto;
}

.partner-logo {
    background: var(--bg-card);
    padding: 18px 42px;
    border-radius: var(--radius-md);
    color: var(--text-dim);
    font-size: 1.1rem;
    font-weight: 600;
    border: 1px solid rgba(0, 240, 255, 0.1);
    transition: var(--transition-normal);
}

.partner-logo:hover {
    color: var(--neon-blue);
    border-color: var(--neon-blue);
}

/* ========== 联系区块 ========== */
.contact-block {
    padding: 80px 24px;
    background: var(--bg-primary);
}

.contact-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
    max-width: 1440px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 36px 24px;
    text-align: center;
    border: 1px solid rgba(0, 240, 255, 0.1);
    transition: var(--transition-normal);
}

.contact-item:hover {
    border-color: var(--neon-blue);
}

.contact-icon {
    font-size: 2.8rem;
    margin-bottom: 18px;
}

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

.contact-value {
    color: var(--neon-blue);
    font-size: 0.95rem;
    word-break: break-all;
}

/* ========== 底部 ========== */
.site-footer {
    background: #050810;
    padding: 65px 24px 35px;
    border-top: 1px solid var(--border-glow);
}

.footer-inner {
    max-width: 1440px;
    margin: 0 auto;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 45px;
    margin-bottom: 45px;
}

.footer-about .brand-name {
    font-size: 1.4rem;
    display: block;
    margin-bottom: 16px;
}

.footer-about p {
    color: var(--text-gray);
    font-size: 0.92rem;
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 18px;
}

.footer-col a {
    display: block;
    color: var(--text-gray);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.footer-col a:hover {
    color: var(--neon-blue);
}

.footer-copy {
    text-align: center;
    padding-top: 35px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
    .video-list,
    .feature-list,
    .team-list {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-main {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .video-list,
    .feature-list,
    .team-list,
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .review-list {
        grid-template-columns: 1fr;
    }
    
    .contact-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 2.4rem;
    }
}

@media (max-width: 768px) {
    .nav-search {
        display: none;
    }
    
    .video-list,
    .feature-list,
    .team-list,
    .gallery-grid,
    .contact-list {
        grid-template-columns: 1fr;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 1.9rem;
    }
    
    .block-title {
        font-size: 1.6rem;
    }
}

/* ========== 内页样式 ========== */
.page-banner {
    padding: 130px 24px 60px;
    background: radial-gradient(ellipse at center, rgba(157, 0, 255, 0.1) 0%, transparent 60%), var(--gradient-dark);
    text-align: center;
}

.page-title {
    font-size: 2.6rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-crumb {
    color: var(--text-gray);
    font-size: 0.92rem;
}

.page-crumb a {
    color: var(--neon-blue);
}

.page-body {
    padding: 60px 24px;
    background: var(--bg-primary);
}

.page-container {
    max-width: 1100px;
    margin: 0 auto;
}

.content-block {
    margin-bottom: 45px;
}

.content-block h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--neon-blue);
}

.content-block p {
    color: var(--text-gray);
    line-height: 1.85;
    margin-bottom: 14px;
}

.content-block ul {
    color: var(--text-gray);
    padding-left: 24px;
    line-height: 2;
}


/* 面包屑导航 */
.breadcrumb {
    background: rgba(0, 240, 255, 0.05);
    padding: 12px 20px;
    border-bottom: 1px solid rgba(0, 240, 255, 0.1);
}

.breadcrumb ol {
    display: flex;
    align-items: center;
    gap: 10px;
    list-style: none;
    margin: 0;
    padding: 0;
    max-width: 1400px;
    margin: 0 auto;
}

.breadcrumb li {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb li:not(:last-child)::after {
    content: ">";
    margin-left: 10px;
    color: rgba(0, 240, 255, 0.5);
}

.breadcrumb a {
    color: #00f0ff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    color: #ff00e5;
}

/* 娱乐专区、AI赋能、社区功能 */
.entertainment-block,
.ai-block,
.community-func-block {
    padding: 60px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

.entertainment-grid,
.ai-grid,
.func-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-top: 40px;
}

.entertainment-item,
.ai-item,
.func-item {
    background: rgba(0, 240, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.15);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
}

.entertainment-item:hover,
.ai-item:hover,
.func-item:hover {
    transform: translateY(-5px);
    border-color: #00f0ff;
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.2);
}

.ent-icon,
.ai-icon,
.func-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.entertainment-item h3,
.ai-item h3,
.func-item h3 {
    font-size: 16px;
    color: #fff;
    margin-bottom: 12px;
}

.entertainment-item p,
.ai-item p,
.func-item p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .entertainment-grid,
    .ai-grid,
    .func-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .entertainment-grid,
    .ai-grid,
    .func-grid {
        grid-template-columns: 1fr;
    }
    
    .breadcrumb ol {
        flex-wrap: wrap;
    }
}