/* =============================================
   青柠视频 - 主样式文件
   网站：snudeajr.cn
   ============================================= */

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

:root {
    --primary: #e8320a;
    --primary-dark: #b82508;
    --primary-light: #ff5c38;
    --secondary: #1a1a2e;
    --secondary-light: #16213e;
    --accent: #f5a623;
    --accent-light: #ffc85a;
    --text-main: #1c1c1c;
    --text-light: #555;
    --text-muted: #888;
    --bg-light: #f7f7f7;
    --bg-dark: #111118;
    --bg-card: #fff;
    --border: #e0e0e0;
    --radius: 10px;
    --radius-lg: 18px;
    --shadow: 0 4px 24px rgba(0,0,0,0.10);
    --shadow-hover: 0 8px 36px rgba(232,50,10,0.18);
    --transition: 0.28s cubic-bezier(.4,0,.2,1);
    --font-main: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', monospace;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background: var(--bg-light);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-dark);
}

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

ul, ol {
    list-style: none;
}

/* ---- 通用布局 ---- */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 72px 0;
}

.section-dark {
    background: var(--secondary);
    color: #fff;
}

.section-gray {
    background: #f0f0f0;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    position: relative;
}

.section-title span {
    color: var(--primary);
}

.section-title::after {
    content: '';
    display: block;
    width: 56px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    margin: 14px auto 0;
}

.section-dark .section-title {
    color: #fff;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 44px;
}

.section-dark .section-subtitle {
    color: #aaa;
}

/* ---- 顶部导航 ---- */
#header {
    background: var(--secondary);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    padding: 0 20px;
    max-width: 1280px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    font-weight: 900;
    color: #fff;
    letter-spacing: -1px;
    flex-shrink: 0;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 900;
    color: #fff;
    letter-spacing: -0.5px;
}

.logo-text span {
    color: var(--primary);
}

.logo-tagline {
    font-size: 0.7rem;
    color: #aaa;
    display: block;
    line-height: 1;
    margin-top: 2px;
}

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.main-nav a {
    color: #ccc;
    font-size: 0.92rem;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 6px;
    transition: all var(--transition);
    white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
    color: #fff;
    background: rgba(232,50,10,0.18);
}

.main-nav a.nav-highlight {
    background: var(--primary);
    color: #fff;
    padding: 8px 16px;
}

.main-nav a.nav-highlight:hover {
    background: var(--primary-dark);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
    background: #16213e;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    padding: 10px 0;
}

.search-bar-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-bar-inner form {
    display: flex;
    flex: 1;
    max-width: 600px;
    margin: 0 auto;
    border-radius: 24px;
    overflow: hidden;
    border: 1.5px solid rgba(232,50,10,0.4);
    background: rgba(255,255,255,0.05);
}

.search-bar-inner input[type="text"] {
    flex: 1;
    border: none;
    background: transparent;
    color: #fff;
    padding: 9px 18px;
    font-size: 0.95rem;
    outline: none;
    font-family: var(--font-main);
}

.search-bar-inner input[type="text"]::placeholder {
    color: #888;
}

.search-bar-inner button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 9px 22px;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 600;
    transition: background var(--transition);
    font-family: var(--font-main);
}

.search-bar-inner button:hover {
    background: var(--primary-dark);
}

/* ---- Banner区域 ---- */
#banner {
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--bg-dark);
}

.banner-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/banner.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.45);
    z-index: 0;
}

.banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(232,50,10,0.18) 100%);
    z-index: 1;
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 20px;
    width: 100%;
}

.banner-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(232,50,10,0.25);
    border: 1px solid rgba(232,50,10,0.5);
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.banner-badge::before {
    content: '▶';
    font-size: 0.7rem;
    color: var(--primary);
}

.banner-title {
    font-size: clamp(2rem, 5vw, 3.6rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.banner-title span {
    color: var(--primary);
    display: inline-block;
}

.banner-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.82);
    max-width: 620px;
    margin-bottom: 36px;
    line-height: 1.8;
}

.banner-stats {
    display: flex;
    gap: 36px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

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

.banner-stat-num {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}

.banner-stat-label {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

.banner-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 0.98rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(232,50,10,0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    color: #fff;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 8px 18px;
    font-size: 0.88rem;
}

/* ---- 视频卡片 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #111;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.06);
}

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

.video-card:hover .video-play-btn {
    opacity: 1;
    background: rgba(0,0,0,0.45);
}

.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(232,50,10,0.92);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: transform var(--transition);
}

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

.play-icon::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

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

.video-stats {
    display: flex;
    gap: 12px;
    margin-top: 10px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

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

/* ---- 特色模块 ---- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1.5px solid transparent;
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto 18px;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 10px;
}

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

/* ---- 专家展示 ---- */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 28px;
}

.expert-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    text-align: center;
}

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

.expert-avatar {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    object-position: top;
}

.expert-info {
    padding: 20px;
}

.expert-name {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 4px;
}

.expert-title {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}

.expert-desc {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 14px;
}

.expert-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 16px;
}

.expert-tag {
    background: var(--bg-light);
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.expert-btns {
    display: flex;
    gap: 8px;
    justify-content: center;
}

/* ---- 合作品牌 ---- */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.partner-item {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    transition: all var(--transition);
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.partner-item:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: scale(1.04);
    box-shadow: var(--shadow);
}

/* ---- FAQ ---- */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    margin-bottom: 14px;
    border: 1.5px solid var(--border);
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item.open {
    border-color: var(--primary);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 22px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    gap: 12px;
    user-select: none;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
    color: var(--primary);
    transition: transform var(--transition);
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 22px 18px;
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
}

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

/* ---- 用户评论 ---- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
    transition: all var(--transition);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}

.review-user {
    flex: 1;
}

.review-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
}

.review-label {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.review-stars {
    color: var(--accent);
    font-size: 0.9rem;
    letter-spacing: 2px;
}

.review-text {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.75;
    margin-bottom: 12px;
}

.review-date {
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ---- 页脚 ---- */
#footer {
    background: var(--bg-dark);
    color: #ccc;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px 48px;
}

.footer-brand .logo-text {
    font-size: 1.6rem;
    margin-bottom: 14px;
    display: block;
}

.footer-desc {
    font-size: 0.9rem;
    color: #888;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.social-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    color: #ccc;
    transition: all var(--transition);
    text-decoration: none;
    border: 1px solid rgba(255,255,255,0.1);
}

.social-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(232,50,10,0.4);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: #888;
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

.footer-qr-wrap {
    display: flex;
    gap: 16px;
    margin-top: 8px;
}

.footer-qr-item {
    text-align: center;
}

.footer-qr {
    width: 80px;
    height: 80px;
    background: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 6px;
    overflow: hidden;
}

.footer-qr canvas {
    width: 80px !important;
    height: 80px !important;
}

.footer-qr-label {
    font-size: 0.72rem;
    color: #888;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 20px;
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-copyright {
    font-size: 0.85rem;
    color: #666;
}

.footer-copyright a {
    color: #888;
}

.footer-icp {
    font-size: 0.82rem;
    color: #555;
}

/* ---- 面包屑 ---- */
.breadcrumb {
    background: #f0f0f0;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.breadcrumb-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.breadcrumb-inner a {
    color: var(--text-muted);
}

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

.breadcrumb-sep {
    color: #bbb;
}

.breadcrumb-current {
    color: var(--primary);
    font-weight: 600;
}

/* ---- 分享按钮 ---- */
.share-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 16px 0;
}

.share-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    text-decoration: none;
}

.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00a1d6; color: #fff; }

.share-btn:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

/* ---- 联系区域 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-detail h5 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.contact-detail p {
    font-size: 0.88rem;
    color: var(--text-light);
}

/* ---- AI赋能区域 ---- */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.ai-card {
    background: linear-gradient(135deg, var(--secondary-light), var(--secondary));
    border: 1px solid rgba(232,50,10,0.2);
    border-radius: var(--radius-lg);
    padding: 28px 22px;
    text-align: center;
    transition: all var(--transition);
}

.ai-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 8px 32px rgba(232,50,10,0.2);
}

.ai-icon {
    font-size: 2.4rem;
    margin-bottom: 14px;
}

.ai-title {
    font-size: 1.05rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 10px;
}

.ai-desc {
    font-size: 0.88rem;
    color: #aaa;
    line-height: 1.7;
}

/* ---- 页面内页标题区 ---- */
.page-hero {
    background: var(--secondary);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(232,50,10,0.12), transparent);
}

.page-hero-content {
    position: relative;
    z-index: 1;
}

.page-hero h1 {
    font-size: 2.4rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 12px;
}

.page-hero h1 span {
    color: var(--primary);
}

.page-hero p {
    font-size: 1.05rem;
    color: #aaa;
    max-width: 600px;
    margin: 0 auto;
}

/* ---- 通用标签 ---- */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.tag-red { background: rgba(232,50,10,0.12); color: var(--primary); }
.tag-orange { background: rgba(245,166,35,0.12); color: var(--accent); }
.tag-blue { background: rgba(0,161,214,0.12); color: #00a1d6; }
.tag-green { background: rgba(7,193,96,0.12); color: #07c160; }

/* ---- 统计数字 ---- */
.stats-row {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
    padding: 40px 0;
}

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

.stat-num {
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}

.stat-unit {
    font-size: 1.2rem;
    color: var(--primary);
}

.stat-label {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ---- 加入社区引导 ---- */
.join-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    counter-reset: step;
}

.join-step {
    text-align: center;
    position: relative;
}

.join-step::after {
    content: '→';
    position: absolute;
    right: -16px;
    top: 24px;
    font-size: 1.4rem;
    color: var(--primary);
    opacity: 0.5;
}

.join-step:last-child::after {
    display: none;
}

.step-num {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 900;
    color: #fff;
    margin: 0 auto 14px;
}

.step-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.step-desc {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .join-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .join-step::after {
        display: none;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--secondary);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        border-top: 1px solid rgba(255,255,255,0.1);
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        padding: 12px 16px;
        border-radius: 8px;
    }

    .hamburger {
        display: flex;
    }

    #header {
        position: relative;
    }

    .banner-title {
        font-size: 1.8rem;
    }

    .banner-stats {
        gap: 20px;
    }

    .section {
        padding: 48px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .ai-grid {
        grid-template-columns: 1fr;
    }

    .join-steps {
        grid-template-columns: 1fr;
    }

    .stats-row {
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .experts-grid {
        grid-template-columns: 1fr;
    }

    .banner-btns {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}

/* ---- 懒加载占位 ---- */
img[data-src] {
    background: #e0e0e0;
    min-height: 100px;
}

/* ---- 滚动动画 ---- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- 视频播放弹窗 ---- */
.video-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.video-modal.open {
    display: flex;
}

.video-modal-inner {
    background: #111;
    border-radius: var(--radius-lg);
    overflow: hidden;
    width: 90%;
    max-width: 900px;
    position: relative;
}

.video-modal-close {
    position: absolute;
    top: 12px;
    right: 14px;
    background: rgba(255,255,255,0.15);
    border: none;
    color: #fff;
    font-size: 1.4rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    transition: background var(--transition);
}

.video-modal-close:hover {
    background: var(--primary);
}

.video-modal video {
    width: 100%;
    aspect-ratio: 16/9;
    display: block;
    background: #000;
}

/* ---- 通知提示 ---- */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--secondary);
    color: #fff;
    padding: 14px 22px;
    border-radius: var(--radius);
    font-size: 0.92rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    z-index: 9998;
    border-left: 4px solid var(--primary);
    transform: translateX(120%);
    transition: transform 0.4s cubic-bezier(.4,0,.2,1);
}

.toast.show {
    transform: translateX(0);
}