/* =====================================================
   偷拍 - 主样式文件
   品牌色：深红 #C8102E | 金色 #D4A017 | 深色背景 #0D0D0D
   ===================================================== */

/* ---- CSS变量 ---- */
:root {
    --brand-red: #C8102E;
    --brand-gold: #D4A017;
    --brand-dark: #0D0D0D;
    --brand-dark2: #161616;
    --brand-dark3: #1E1E1E;
    --brand-gray: #2A2A2A;
    --brand-light: #F5F0E8;
    --brand-text: #E8E0D0;
    --brand-muted: #9A9080;
    --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Noto Sans SC', sans-serif;
    --transition: all 0.3s ease;
    --shadow-gold: 0 4px 20px rgba(212,160,23,0.3);
    --shadow-red: 0 4px 20px rgba(200,16,46,0.4);
    --radius: 8px;
    --radius-lg: 16px;
}

/* ---- 重置与基础 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-main);
    background-color: var(--brand-dark);
    color: var(--brand-text);
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: var(--brand-gold); text-decoration: none; transition: var(--transition); }
a:hover { color: #F0C040; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: var(--font-main); }

/* ---- 通用工具类 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background-color: var(--brand-dark2); }
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--brand-gold);
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: 2px;
}
.section-title span { color: var(--brand-red); }
.section-subtitle {
    text-align: center;
    color: var(--brand-muted);
    margin-bottom: 50px;
    font-size: 1rem;
}
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 1px;
    transition: var(--transition);
    border: none;
}
.btn-primary {
    background: linear-gradient(135deg, var(--brand-red), #9B0020);
    color: #fff;
    box-shadow: var(--shadow-red);
}
.btn-primary:hover { background: linear-gradient(135deg, #E0142F, var(--brand-red)); transform: translateY(-2px); color: #fff; }
.btn-gold {
    background: linear-gradient(135deg, var(--brand-gold), #A07010);
    color: #0D0D0D;
    box-shadow: var(--shadow-gold);
}
.btn-gold:hover { background: linear-gradient(135deg, #F0C040, var(--brand-gold)); transform: translateY(-2px); color: #0D0D0D; }
.btn-outline {
    border: 2px solid var(--brand-gold);
    color: var(--brand-gold);
    background: transparent;
}
.btn-outline:hover { background: var(--brand-gold); color: #0D0D0D; }
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-red { background: var(--brand-red); color: #fff; }
.badge-gold { background: var(--brand-gold); color: #0D0D0D; }
.badge-new { background: #E74C3C; color: #fff; animation: pulse 2s infinite; }
.divider {
    width: 60px; height: 3px;
    background: linear-gradient(90deg, var(--brand-red), var(--brand-gold));
    margin: 16px auto 40px;
    border-radius: 2px;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.6} }

/* ---- 顶部公告栏 ---- */
.top-bar {
    background: linear-gradient(90deg, var(--brand-red), #8B0015, var(--brand-red));
    background-size: 200% 100%;
    animation: gradientMove 4s ease infinite;
    color: #fff;
    font-size: 0.82rem;
    padding: 8px 0;
    text-align: center;
    letter-spacing: 1px;
}
@keyframes gradientMove { 0%{background-position:0%} 50%{background-position:100%} 100%{background-position:0%} }
.top-bar a { color: var(--brand-gold); }

/* ---- 导航栏 ---- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(13,13,13,0.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(212,160,23,0.2);
    padding: 0;
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 20px;
}
.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.navbar-brand img.site-logo { height: 44px; width: auto; }
.navbar-brand img.site-favicon { height: 28px; width: 28px; border-radius: 4px; }
.navbar-brand .brand-name {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--brand-gold);
    letter-spacing: 2px;
    white-space: nowrap;
}
.navbar-brand .brand-name span { color: var(--brand-red); }
.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-item { position: relative; }
.nav-link {
    display: block;
    padding: 8px 14px;
    color: var(--brand-text);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
    color: var(--brand-gold);
    background: rgba(212,160,23,0.1);
}
.nav-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 180px;
    background: var(--brand-dark2);
    border: 1px solid rgba(212,160,23,0.2);
    border-radius: var(--radius);
    box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: var(--transition);
    z-index: 100;
}
.nav-item:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--brand-text);
    font-size: 0.88rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
}
.nav-dropdown a:last-child { border-bottom: none; }
.nav-dropdown a:hover { color: var(--brand-gold); background: rgba(212,160,23,0.08); padding-left: 22px; }

/* 搜索框 */
.nav-search {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(212,160,23,0.25);
    border-radius: 24px;
    padding: 6px 14px;
    gap: 8px;
    flex-shrink: 0;
}
.nav-search input {
    background: none;
    border: none;
    outline: none;
    color: var(--brand-text);
    font-size: 0.88rem;
    width: 160px;
    font-family: var(--font-main);
}
.nav-search input::placeholder { color: var(--brand-muted); }
.nav-search button {
    background: none;
    border: none;
    color: var(--brand-gold);
    font-size: 1rem;
    padding: 0;
    line-height: 1;
}
.nav-search button:hover { color: #F0C040; }
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--brand-gold);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- Hero 区域 ---- */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--brand-dark);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/hero_banner.png');
    background-size: cover;
    background-position: center;
    filter: brightness(0.35);
    z-index: 0;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13,13,13,0.85) 0%, rgba(200,16,46,0.15) 50%, rgba(13,13,13,0.9) 100%);
    z-index: 1;
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
}
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(200,16,46,0.2);
    border: 1px solid rgba(200,16,46,0.4);
    border-radius: 20px;
    padding: 5px 14px;
    font-size: 0.82rem;
    color: var(--brand-gold);
    margin-bottom: 20px;
    letter-spacing: 2px;
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    line-height: 1.2;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: 2px;
}
.hero h1 .highlight { color: var(--brand-gold); }
.hero h1 .red { color: var(--brand-red); }
.hero-desc {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.75);
    margin-bottom: 32px;
    max-width: 560px;
    line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(212,160,23,0.2);
}
.hero-stat-num {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--brand-gold);
    line-height: 1;
}
.hero-stat-label { font-size: 0.82rem; color: var(--brand-muted); margin-top: 4px; }

/* ---- 视频卡片 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: var(--brand-dark2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(212,160,23,0.1);
    transition: var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-6px);
    border-color: rgba(212,160,23,0.4);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #111;
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(200,16,46,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(200,16,46,0.6);
    transform: scale(0.8);
    transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
    content: '';
    border: 0 solid transparent;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    border-left: 20px solid #fff;
    margin-left: 4px;
}
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    font-size: 0.75rem;
    padding: 2px 7px;
    border-radius: 4px;
}
.video-tag {
    position: absolute;
    top: 10px;
    left: 10px;
}
.video-info { padding: 16px; }
.video-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--brand-text);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--brand-muted);
}
.video-stats { display: flex; gap: 12px; }
.video-stat { display: flex; align-items: center; gap: 4px; }

/* ---- 专家卡片 ---- */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}
.expert-card {
    background: var(--brand-dark2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(212,160,23,0.15);
    transition: var(--transition);
}
.expert-card:hover {
    border-color: rgba(212,160,23,0.4);
    transform: translateY(-4px);
    box-shadow: var(--shadow-gold);
}
.expert-photo {
    height: 240px;
    overflow: hidden;
    position: relative;
}
.expert-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    transition: transform 0.5s ease;
}
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-role {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
    padding: 20px 16px 12px;
    font-size: 0.82rem;
    color: var(--brand-gold);
    letter-spacing: 1px;
}
.expert-body { padding: 20px; }
.expert-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}
.expert-bio {
    font-size: 0.88rem;
    color: var(--brand-muted);
    line-height: 1.6;
    margin-bottom: 14px;
}
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.award-tag {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    background: rgba(212,160,23,0.12);
    border: 1px solid rgba(212,160,23,0.25);
    color: var(--brand-gold);
}
.expert-actions { display: flex; gap: 10px; }
.expert-actions .btn { flex: 1; text-align: center; padding: 8px 12px; font-size: 0.85rem; }

/* ---- 合作品牌 ---- */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}
.partner-item {
    background: var(--brand-dark2);
    border: 1px solid rgba(212,160,23,0.15);
    border-radius: var(--radius);
    padding: 16px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--brand-muted);
    transition: var(--transition);
    text-align: center;
    min-width: 140px;
}
.partner-item:hover {
    color: var(--brand-gold);
    border-color: rgba(212,160,23,0.4);
    background: rgba(212,160,23,0.06);
}

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--brand-dark2);
    border: 1px solid rgba(212,160,23,0.12);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover { border-color: rgba(212,160,23,0.3); }
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--brand-text);
    transition: var(--transition);
    user-select: none;
}
.faq-question:hover { color: var(--brand-gold); }
.faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(200,16,46,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-red);
    font-size: 1.1rem;
    flex-shrink: 0;
    transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--brand-red); color: #fff; }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 22px;
    color: var(--brand-muted);
    font-size: 0.9rem;
    line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 22px 18px; }

/* ---- 用户评论 ---- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.review-card {
    background: var(--brand-dark2);
    border: 1px solid rgba(212,160,23,0.1);
    border-radius: var(--radius-lg);
    padding: 22px;
    transition: var(--transition);
    position: relative;
}
.review-card:hover { border-color: rgba(212,160,23,0.3); transform: translateY(-3px); }
.review-card::before {
    content: '"';
    position: absolute;
    top: 12px;
    right: 18px;
    font-size: 4rem;
    color: rgba(212,160,23,0.1);
    font-family: Georgia, serif;
    line-height: 1;
}
.review-stars { color: var(--brand-gold); font-size: 1rem; margin-bottom: 10px; letter-spacing: 2px; }
.review-text { font-size: 0.9rem; color: var(--brand-muted); line-height: 1.7; margin-bottom: 16px; }
.reviewer { display: flex; align-items: center; gap: 12px; }
.reviewer-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-red), var(--brand-gold));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}
.reviewer-name { font-size: 0.9rem; font-weight: 600; color: var(--brand-text); }
.reviewer-tag { font-size: 0.75rem; color: var(--brand-muted); }

/* ---- 联系区域 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}
.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}
.contact-icon {
    width: 48px;
    height: 48px;
    background: rgba(200,16,46,0.15);
    border: 1px solid rgba(200,16,46,0.3);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}
.contact-label { font-size: 0.82rem; color: var(--brand-muted); margin-bottom: 4px; }
.contact-value { font-size: 0.95rem; color: var(--brand-text); font-weight: 500; }
.qr-grid { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-item { text-align: center; }
.qr-item img {
    width: 120px;
    height: 120px;
    border-radius: var(--radius);
    border: 2px solid rgba(212,160,23,0.3);
    object-fit: cover;
}
.qr-label { font-size: 0.8rem; color: var(--brand-muted); margin-top: 8px; }

/* ---- 社区入口 ---- */
.community-entries {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}
.community-entry {
    background: var(--brand-dark2);
    border: 1px solid rgba(212,160,23,0.12);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}
.community-entry:hover {
    border-color: var(--brand-gold);
    background: rgba(212,160,23,0.06);
    transform: translateY(-4px);
}
.community-entry-icon { font-size: 2.2rem; margin-bottom: 10px; }
.community-entry-name { font-size: 0.95rem; font-weight: 600; color: var(--brand-text); margin-bottom: 4px; }
.community-entry-desc { font-size: 0.78rem; color: var(--brand-muted); }

/* ---- AI赋能区域 ---- */
.ai-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.ai-feature-card {
    background: linear-gradient(135deg, var(--brand-dark2), var(--brand-dark3));
    border: 1px solid rgba(100,180,255,0.15);
    border-radius: var(--radius-lg);
    padding: 28px 22px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.ai-feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #4A90D9, #7B68EE, #4A90D9);
}
.ai-feature-card:hover { border-color: rgba(100,180,255,0.4); transform: translateY(-4px); }
.ai-icon { font-size: 2rem; margin-bottom: 14px; }
.ai-title { font-size: 1.05rem; font-weight: 700; color: #7BB8F0; margin-bottom: 10px; }
.ai-desc { font-size: 0.88rem; color: var(--brand-muted); line-height: 1.7; }

/* ---- 分享按钮 ---- */
.share-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}
.share-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 24px;
    font-size: 0.88rem;
    font-weight: 600;
    border: none;
    transition: var(--transition);
    cursor: pointer;
}
.share-btn:hover { transform: translateY(-2px); }
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #69C9D0; }
.share-bilibili { background: #00A1D6; color: #fff; }

/* ---- 面包屑 ---- */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.85rem;
    color: var(--brand-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--brand-muted); }
.breadcrumb a:hover { color: var(--brand-gold); }
.breadcrumb-sep { color: rgba(255,255,255,0.2); }
.breadcrumb-current { color: var(--brand-gold); }

/* ---- 页脚 ---- */
.footer {
    background: #080808;
    border-top: 1px solid rgba(212,160,23,0.15);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .brand-logo { height: 50px; margin-bottom: 16px; }
.footer-brand p { font-size: 0.88rem; color: var(--brand-muted); line-height: 1.8; margin-bottom: 20px; }
.footer-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--brand-gold);
    margin-bottom: 16px;
    letter-spacing: 1px;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: var(--brand-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--brand-gold); padding-left: 6px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--brand-muted);
}
.footer-bottom a { color: var(--brand-muted); }
.footer-bottom a:hover { color: var(--brand-gold); }
.footer-logo-bottom { height: 32px; }

/* ---- 弹幕效果 ---- */
.danmu-container {
    position: relative;
    overflow: hidden;
    height: 60px;
    background: rgba(0,0,0,0.3);
    border-radius: var(--radius);
    margin: 20px 0;
}
.danmu-item {
    position: absolute;
    white-space: nowrap;
    font-size: 0.88rem;
    color: rgba(255,255,255,0.8);
    top: 50%;
    transform: translateY(-50%);
    animation: danmuMove linear infinite;
}
@keyframes danmuMove { from{left:100%} to{left:-100%} }

/* ---- 加入指南 ---- */
.join-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    counter-reset: step;
}
.join-step {
    text-align: center;
    padding: 28px 16px;
    background: var(--brand-dark2);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(212,160,23,0.12);
    position: relative;
    transition: var(--transition);
}
.join-step:hover { border-color: rgba(212,160,23,0.35); transform: translateY(-4px); }
.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--brand-red), #9B0020);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin: 0 auto 14px;
    box-shadow: var(--shadow-red);
}
.step-title { font-size: 1rem; font-weight: 600; color: var(--brand-text); margin-bottom: 8px; }
.step-desc { font-size: 0.85rem; color: var(--brand-muted); line-height: 1.6; }

/* ---- 统计数字 ---- */
.stats-bar {
    background: linear-gradient(135deg, var(--brand-dark2), #1A0A0A);
    border-top: 1px solid rgba(200,16,46,0.2);
    border-bottom: 1px solid rgba(200,16,46,0.2);
    padding: 40px 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}
.stat-item { padding: 10px; }
.stat-number {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--brand-gold);
    line-height: 1;
    margin-bottom: 6px;
}
.stat-label { font-size: 0.85rem; color: var(--brand-muted); }

/* ---- 懒加载占位 ---- */
.lazy { opacity: 0; transition: opacity 0.5s ease; }
.lazy.loaded { opacity: 1; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .ai-features { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .join-steps { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .section { padding: 50px 0; }
    .section-title { font-size: 1.5rem; }
    .nav-menu, .nav-search { display: none; }
    .hamburger { display: flex; }
    .nav-menu.open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 70px; left: 0; right: 0;
        background: rgba(13,13,13,0.98);
        padding: 20px;
        border-bottom: 1px solid rgba(212,160,23,0.2);
        z-index: 999;
        gap: 4px;
    }
    .nav-dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; background: rgba(255,255,255,0.03); margin-top: 4px; }
    .hero { min-height: 480px; }
    .hero h1 { font-size: 1.8rem; }
    .hero-stats { gap: 20px; }
    .video-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .expert-grid { grid-template-columns: 1fr; }
    .ai-features { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .join-steps { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .join-steps { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--brand-dark); }
::-webkit-scrollbar-thumb { background: var(--brand-gray); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-gold); }

/* ---- 选中文字 ---- */
::selection { background: rgba(200,16,46,0.4); color: #fff; }

/* ---- 动画 ---- */
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn { from{opacity:0} to{opacity:1} }
.animate-fade-up { animation: fadeInUp 0.6s ease forwards; }
.animate-fade { animation: fadeIn 0.8s ease forwards; }

/* ---- 通知条 ---- */
.notice-bar {
    background: rgba(212,160,23,0.1);
    border: 1px solid rgba(212,160,23,0.2);
    border-radius: var(--radius);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
    font-size: 0.88rem;
    color: var(--brand-gold);
}

/* ---- 标签云 ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    background: rgba(212,160,23,0.08);
    border: 1px solid rgba(212,160,23,0.2);
    color: var(--brand-muted);
    transition: var(--transition);
    cursor: pointer;
}
.tag-item:hover { background: rgba(212,160,23,0.15); color: var(--brand-gold); border-color: rgba(212,160,23,0.4); }

/* ---- 回到顶部按钮 ---- */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--brand-red), #9B0020);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    box-shadow: var(--shadow-red);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    text-decoration: none;
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { background: linear-gradient(135deg, #E0142F, var(--brand-red)); transform: translateY(-3px); color: #fff; }

/* ---- video-card hover增强 ---- */
.video-card .video-play-btn {
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.video-card:hover .video-play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}
.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

/* ---- 移动端优化 ---- */
@media (max-width: 768px) {
    .community-entries { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { gap: 24px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .back-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 1rem; }
}
@media (max-width: 480px) {
    .community-entries { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* ---- 打印样式 ---- */
@media print {
    .navbar, .top-bar, .back-top, .danmu-container, .share-bar { display: none !important; }
    body { background: #fff; color: #000; }
    a { color: #000; }
}