/* =============================================
   糖心vlog 原创爱情海风格样式表 v2.0
   域名: srxdxakt.cn
   ============================================= */
:root {
    --primary-color:   #0077b6;
    --secondary-color: #ff6b6b;
    --accent-color:    #fca311;
    --bg-color:        #f4f7fb;
    --text-color:      #333333;
    --light-text:      #ffffff;
    --border-radius:   12px;
    --box-shadow:      0 4px 18px rgba(0,0,0,0.08);
    --transition:      all 0.3s ease;
    --max-width:       1200px;
}

/* ---- Reset ---- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    font-family: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Helvetica,Arial,sans-serif;
    font-size: 15px;
}
a { text-decoration:none; color:inherit; transition:var(--transition); }
img { max-width:100%; height:auto; display:block; }
ul { list-style:none; }

/* ---- 通用按钮 ---- */
.btn-primary {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
}
.btn-primary:hover { background:#005f92; transform:translateY(-2px); }

/* =============================================
   导航栏
   ============================================= */
.header {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo img { height:40px; width:40px; border-radius:8px; object-fit:contain; }
.logo-text { font-size:22px; font-weight:800; color:var(--primary-color); white-space:nowrap; }
.logo-text span { color:var(--secondary-color); }

/* PC 导航菜单 */
.nav-menu {
    display: flex;
    gap: 4px;
    align-items: center;
}
.nav-menu li a {
    font-weight: 500;
    font-size: 15px;
    padding: 7px 13px;
    border-radius: 8px;
    white-space: nowrap;
}
.nav-menu li a:hover,
.nav-menu li a.active {
    background: var(--primary-color);
    color: #fff;
}

/* 汉堡按钮（移动端） */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 26px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}
.hamburger span {
    display: block;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* =============================================
   搜索栏
   ============================================= */
.search-bar {
    max-width: var(--max-width);
    margin: 14px auto;
    padding: 0 20px;
}
.search-wrapper {
    display: flex;
    background: #fff;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    border: 1px solid #e5eaf0;
}
.search-input {
    flex: 1;
    padding: 12px 20px;
    border: none;
    outline: none;
    font-size: 15px;
    background: transparent;
}
.search-btn {
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0 28px;
    cursor: pointer;
    font-weight: 700;
    font-size: 15px;
    transition: var(--transition);
    white-space: nowrap;
}
.search-btn:hover { background:#005f92; }

/* =============================================
   Hero Banner
   ============================================= */
.hero {
    max-width: var(--max-width);
    margin: 18px auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    box-shadow: var(--box-shadow);
}
.hero img { width:100%; height:auto; object-fit:cover; }
.hero-content {
    position: absolute;
    bottom: 0; left: 0;
    width: 100%;
    background: linear-gradient(transparent, rgba(0,0,0,0.78));
    color: #fff;
    padding: 50px 30px 22px;
}
.hero-content h1 { font-size:30px; margin-bottom:8px; font-weight:800; }
.hero-content p  { font-size:16px; opacity:.9; }

/* =============================================
   通用 Section
   ============================================= */
.section {
    max-width: var(--max-width);
    margin: 36px auto;
    padding: 0 20px;
}
.section-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 28px 28px;
    box-shadow: var(--box-shadow);
    margin: 36px auto;
    max-width: var(--max-width);
}
.section-title {
    font-size: 26px;
    color: var(--primary-color);
    margin-bottom: 18px;
    border-left: 5px solid var(--secondary-color);
    padding-left: 14px;
    font-weight: 800;
}
.section-title-light {
    font-size: 26px;
    color: #fff;
    margin-bottom: 18px;
    border-left: 5px solid rgba(255,255,255,0.5);
    padding-left: 14px;
    font-weight: 800;
}

/* AI 赋能区块 */
.section-ai {
    max-width: var(--max-width);
    margin: 36px auto;
    padding: 40px 28px;
    background: linear-gradient(135deg, #0077b6, #005f92);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}
.ai-card {
    background: rgba(255,255,255,0.12);
    border-radius: 10px;
    padding: 22px;
    color: #fff;
    transition: var(--transition);
}
.ai-card:hover { background: rgba(255,255,255,0.2); }

/* =============================================
   分类卡片网格
   ============================================= */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
    gap: 18px;
    margin-top: 18px;
}
.cat-card {
    display: block;
    text-align: center;
    padding: 20px 14px;
    background: #f4f7fb;
    border-radius: 10px;
    transition: var(--transition);
    color: var(--text-color);
    border: 1px solid transparent;
}
.cat-card:hover {
    background: #e8f4fc;
    border-color: var(--primary-color);
    transform: translateY(-3px);
}
.cat-icon { font-size:34px; margin-bottom:10px; }
.cat-card h4 { color:var(--primary-color); margin-bottom:6px; font-size:15px; }
.cat-card p  { font-size:12px; color:#666; }

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 22px;
}
.video-card {
    background: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}
.video-card:hover { transform:translateY(-5px); box-shadow:0 8px 28px rgba(0,0,0,0.12); }

.video-thumb {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #dde3ea;
    overflow: hidden;
}
.video-thumb img {
    position: absolute;
    top:0; left:0;
    width:100%; height:100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform:scale(1.06); }

/* 播放按钮遮罩 */
.play-btn-overlay {
    position: absolute;
    top:0; left:0;
    width:100%; height:100%;
    background: rgba(0,0,0,0.28);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: var(--transition);
}
.video-card:hover .play-btn-overlay { opacity:1; }
.play-icon {
    width:58px; height:58px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 16px rgba(255,107,107,0.5);
}
.play-icon::after {
    content:'';
    width:0; height:0;
    border-style:solid;
    border-width:11px 0 11px 19px;
    border-color:transparent transparent transparent #fff;
    margin-left:5px;
}

/* 视频标签 badge */
.video-badge {
    position: absolute;
    top: 8px; left: 8px;
    background: var(--secondary-color);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 1px;
}

.video-info { padding:14px; }
.video-title {
    font-size:15px;
    font-weight:700;
    margin-bottom:6px;
    display:-webkit-box;
    -webkit-line-clamp:2;
    -webkit-box-orient:vertical;
    overflow:hidden;
    line-height:1.5;
}
.video-desc {
    font-size:13px;
    color:#888;
    margin-bottom:8px;
    display:-webkit-box;
    -webkit-line-clamp:2;
    -webkit-box-orient:vertical;
    overflow:hidden;
}
.video-meta {
    display:flex;
    justify-content:space-between;
    color:#999;
    font-size:12px;
    margin-bottom:8px;
}
.video-tags { display:flex; flex-wrap:wrap; gap:5px; }
.tag {
    background:#eef2f5;
    color:var(--primary-color);
    padding:3px 8px;
    border-radius:4px;
    font-size:11px;
}

/* =============================================
   专家卡片
   ============================================= */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 28px;
}
.expert-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}
.expert-card:hover { transform:translateY(-4px); }
.expert-avatar {
    width:110px; height:110px;
    border-radius:50%;
    object-fit:cover;
    margin:0 auto 14px;
    border:3px solid var(--primary-color);
}
.expert-name  { font-size:19px; color:var(--primary-color); margin-bottom:4px; font-weight:700; }
.expert-title { color:var(--secondary-color); font-weight:700; margin-bottom:12px; font-size:14px; }
.expert-desc  { font-size:13px; color:#666; margin-bottom:12px; line-height:1.6; }
.expert-btn {
    display:inline-block;
    padding:7px 18px;
    background:var(--primary-color);
    color:#fff;
    border-radius:20px;
    font-size:13px;
    transition:var(--transition);
}
.expert-btn:hover { background:#005f92; }

/* =============================================
   评论区
   ============================================= */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}
.review-card {
    background:#fff;
    padding:20px;
    border-radius:var(--border-radius);
    box-shadow:var(--box-shadow);
    border-top:4px solid var(--accent-color);
}
.review-user {
    display:flex;
    align-items:center;
    gap:10px;
    margin-bottom:12px;
    flex-wrap:wrap;
}
.user-avatar {
    width:40px; height:40px;
    background:var(--primary-color);
    color:#fff;
    border-radius:50%;
    display:flex;
    justify-content:center;
    align-items:center;
    font-weight:700;
    font-size:16px;
    flex-shrink:0;
}
.stars { color:#ffca28; font-size:14px; }

/* =============================================
   FAQ
   ============================================= */
.faq-list {
    background:#fff;
    border-radius:var(--border-radius);
    box-shadow:var(--box-shadow);
    padding:20px 24px;
}
.faq-item { border-bottom:1px solid #eee; padding:16px 0; }
.faq-item:last-child { border-bottom:none; }
.faq-q {
    font-weight:700;
    color:var(--primary-color);
    margin-bottom:10px;
    display:flex;
    align-items:flex-start;
    gap:8px;
    font-size:15px;
}
.faq-q::before { content:'Q:'; color:var(--secondary-color); flex-shrink:0; }
.faq-a { color:#555; padding-left:26px; font-size:14px; line-height:1.7; }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
    max-width:var(--max-width);
    margin:14px auto;
    padding:0 20px;
    font-size:13px;
    color:#888;
}
.breadcrumb a { color:var(--primary-color); }
.breadcrumb a:hover { text-decoration:underline; }

/* =============================================
   底部
   ============================================= */
.footer {
    background:#1a1f2e;
    color:#bbb;
    padding:44px 20px 20px;
    margin-top:60px;
}
.footer-content {
    max-width:var(--max-width);
    margin:0 auto;
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(220px, 1fr));
    gap:28px;
    margin-bottom:28px;
}
.footer-col h3 { color:#fff; margin-bottom:14px; font-size:17px; }
.footer-col p  { margin-bottom:8px; font-size:14px; }
.footer-col a  { color:#aaa; }
.footer-col a:hover { color:#fff; }
.social-share { display:flex; gap:8px; margin-top:14px; flex-wrap:wrap; }
.share-btn {
    width:34px; height:34px;
    border-radius:50%;
    background:#333;
    display:flex;
    justify-content:center;
    align-items:center;
    color:#fff;
    font-size:12px;
    font-weight:700;
    transition:var(--transition);
    cursor:pointer;
}
.share-btn:hover { background:var(--primary-color); }
.footer-bottom {
    max-width:var(--max-width);
    margin:0 auto;
    border-top:1px solid #333;
    padding-top:18px;
    text-align:center;
    font-size:13px;
}

/* =============================================
   响应式 — 平板 (≤ 900px)
   ============================================= */
@media (max-width: 900px) {
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .cat-grid { grid-template-columns: repeat(3, 1fr); }
}

/* =============================================
   响应式 — 手机 (≤ 640px)
   ============================================= */
@media (max-width: 640px) {
    /* 汉堡菜单 */
    .hamburger { display:flex; }
    nav[aria-label="主导航"] {
        position: absolute;
        top: 70px; left: 0;
        width: 100%;
        background: #fff;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        display: none;
        z-index: 999;
    }
    nav[aria-label="主导航"].open { display:block; }
    .nav-menu {
        flex-direction: column;
        gap: 0;
        padding: 10px 0;
    }
    .nav-menu li a {
        display: block;
        padding: 12px 24px;
        border-radius: 0;
        font-size: 16px;
    }
    .nav-menu li a:hover,
    .nav-menu li a.active {
        background: #e8f4fc;
        color: var(--primary-color);
    }

    /* Hero */
    .hero-content h1 { font-size:20px; }
    .hero-content p  { font-size:14px; }

    /* 视频网格 */
    .video-grid  { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr; }
    .review-grid { grid-template-columns: 1fr; }
    .cat-grid    { grid-template-columns: repeat(2, 1fr); }

    /* Section */
    .section      { padding:0 14px; }
    .section-card { padding:20px 16px; }
    .section-ai   { padding:28px 16px; }
    .section-title { font-size:20px; }

    /* 搜索 */
    .search-btn { padding:0 16px; font-size:14px; }

    /* 底部 */
    .footer-content { grid-template-columns:1fr; }
}

/* =============================================
   图片懒加载占位
   ============================================= */
img[loading="lazy"] {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
}