/* ============================================
   黑丝植物视频社区 - 主样式文件
   rkteekg.cn | 原创设计
   ============================================ */

/* ---- CSS变量 ---- */
:root {
    --primary: #1a6b3a;
    --primary-dark: #0d4a26;
    --primary-light: #2d9e56;
    --secondary: #c8a84b;
    --secondary-light: #e8c96a;
    --accent: #e85d2a;
    --bg-dark: #0a1f0f;
    --bg-mid: #122a18;
    --bg-light: #f0f7f2;
    --text-dark: #1a2e1e;
    --text-mid: #4a6a52;
    --text-light: #7a9a82;
    --white: #ffffff;
    --border: #c8e0ce;
    --shadow: 0 4px 24px rgba(26,107,58,0.15);
    --shadow-lg: 0 8px 48px rgba(26,107,58,0.22);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    --font: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);color:var(--text-dark);background:#fff;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{cursor:pointer;font-family:var(--font);border:none;background:none}

/* ---- 容器 ---- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-padding{padding:72px 0}

/* ---- 顶部公告栏 ---- */
.top-bar{
    background:linear-gradient(90deg,var(--bg-dark),var(--primary));
    color:rgba(255,255,255,0.92);
    font-size:0.8rem;padding:8px 0;text-align:center
}
.top-bar a{color:var(--secondary);font-weight:600}
.top-bar a:hover{color:#fff}

/* ---- 头部 ---- */
.site-header{
    position:sticky;top:0;z-index:1000;
    background:rgba(255,255,255,0.97);
    backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
    box-shadow:0 2px 20px rgba(26,107,58,0.1);
    border-bottom:1px solid var(--border)
}
.header-inner{
    max-width:1200px;margin:0 auto;padding:0 20px;
    height:64px;display:flex;align-items:center;gap:24px
}
.logo-wrap{display:flex;align-items:center;gap:12px;text-decoration:none;flex-shrink:0}
.logo-img{width:48px;height:48px;border-radius:50%;object-fit:cover;border:2px solid var(--primary)}
.logo-text{display:flex;flex-direction:column}
.logo-name{font-size:1.2rem;font-weight:700;color:var(--primary);line-height:1.2}
.logo-slogan{font-size:0.68rem;color:var(--text-light);letter-spacing:0.5px}
.main-nav{display:flex;align-items:center;gap:4px;flex:1}
.main-nav a{
    padding:6px 14px;border-radius:8px;font-size:0.9rem;
    color:var(--text-dark);font-weight:500;transition:var(--transition)
}
.main-nav a:hover,.main-nav a.active{background:var(--bg-light);color:var(--primary)}
.search-wrap{margin-left:auto}
.header-search{
    display:flex;align-items:center;gap:8px;
    background:var(--bg-light);border-radius:24px;
    padding:6px 16px;border:1px solid var(--border)
}
.header-search input{
    border:none;background:none;outline:none;
    font-size:0.85rem;width:160px;color:var(--text-dark)
}
.header-search button{color:var(--primary);padding:0}
.hamburger{display:none;flex-direction:column;gap:5px;padding:4px}
.hamburger span{width:22px;height:2px;background:var(--text-dark);border-radius:2px;transition:var(--transition)}

/* ---- 导航搜索栏 ---- */
.nav-search-bar{
    background:var(--bg-light);border-bottom:1px solid var(--border);
    padding:10px 0
}
.nav-search-inner{max-width:1200px;margin:0 auto;padding:0 20px}
.nav-search-form{
    display:flex;align-items:center;gap:10px;
    background:#fff;border-radius:28px;padding:8px 20px;
    border:1.5px solid var(--border);max-width:600px;margin-bottom:10px;
    box-shadow:0 2px 8px rgba(26,107,58,0.06)
}
.nav-search-form input{
    flex:1;border:none;background:none;outline:none;
    font-size:0.95rem;color:var(--text-dark)
}
.nav-search-form button{
    background:var(--primary);color:#fff;border-radius:20px;
    padding:6px 18px;font-size:0.85rem;font-weight:600;
    transition:var(--transition)
}
.nav-search-form button:hover{background:var(--primary-dark)}
.nav-search-tags{display:flex;flex-wrap:wrap;gap:8px}
.nav-search-tags span{
    background:#fff;border:1px solid var(--border);
    border-radius:16px;padding:3px 12px;font-size:0.78rem;
    color:var(--text-mid);cursor:pointer;transition:var(--transition)
}
.nav-search-tags span:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---- Hero Banner ---- */
.hero-section{
    position:relative;min-height:580px;display:flex;
    align-items:center;overflow:hidden
}
.hero-bg{
    position:absolute;inset:0;
    background-image:url('/images/hero_banner.jpg');
    background-size:cover;background-position:center;
    transform:scale(1.05);transition:transform 8s ease
}
.hero-section:hover .hero-bg{transform:scale(1)}
.hero-overlay{
    position:absolute;inset:0;
    background:linear-gradient(135deg,rgba(10,31,15,0.82) 0%,rgba(26,107,58,0.45) 60%,rgba(10,31,15,0.3) 100%)
}
.hero-content{
    position:relative;z-index:2;
    max-width:1200px;margin:0 auto;padding:80px 20px;
    color:#fff
}
.hero-badge{
    display:inline-flex;align-items:center;gap:8px;
    background:rgba(200,168,75,0.25);border:1px solid rgba(200,168,75,0.5);
    border-radius:24px;padding:6px 18px;font-size:0.82rem;
    color:var(--secondary-light);margin-bottom:20px;backdrop-filter:blur(8px)
}
.hero-title{
    font-size:clamp(2rem,5vw,3.2rem);font-weight:800;
    line-height:1.2;margin-bottom:16px;
    text-shadow:0 2px 20px rgba(0,0,0,0.5)
}
.hero-title .highlight{color:var(--secondary-light)}
.hero-desc{
    font-size:1rem;color:rgba(255,255,255,0.85);
    max-width:560px;margin-bottom:28px;line-height:1.8
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:12px 28px;border-radius:28px;font-size:0.95rem;
    font-weight:600;transition:var(--transition);cursor:pointer
}
.btn-primary{
    background:var(--primary);color:#fff;
    box-shadow:0 4px 20px rgba(26,107,58,0.4)
}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);color:#fff}
.btn-secondary{
    background:var(--secondary);color:var(--bg-dark);
    box-shadow:0 4px 20px rgba(200,168,75,0.4)
}
.btn-secondary:hover{background:var(--secondary-light);transform:translateY(-2px);color:var(--bg-dark)}
.btn-white{
    background:rgba(255,255,255,0.15);color:#fff;
    border:1.5px solid rgba(255,255,255,0.4);backdrop-filter:blur(8px)
}
.btn-white:hover{background:rgba(255,255,255,0.25);color:#fff}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap}
.hero-stat-item{text-align:center}
.hero-stat-num{
    display:block;font-size:1.8rem;font-weight:800;
    color:var(--secondary-light)
}
.hero-stat-label{font-size:0.78rem;color:rgba(255,255,255,0.7)}

/* ---- 面包屑 ---- */
.breadcrumb{
    background:var(--bg-light);border-bottom:1px solid var(--border);
    padding:8px 0;font-size:0.82rem
}
.breadcrumb-inner{max-width:1200px;margin:0 auto;padding:0 20px;color:var(--text-light)}
.breadcrumb-inner a{color:var(--text-mid)}
.breadcrumb-inner a:hover{color:var(--primary)}

/* ---- 通用区块标题 ---- */
.section-header{text-align:center;margin-bottom:48px}
.section-title{
    font-size:clamp(1.5rem,3vw,2rem);font-weight:800;
    color:var(--text-dark);margin-bottom:12px;position:relative;
    display:inline-block
}
.section-title::after{
    content:'';position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);
    width:48px;height:3px;background:var(--primary);border-radius:2px
}
.section-subtitle{font-size:0.95rem;color:var(--text-mid);max-width:560px;margin:16px auto 0}

/* ---- 视频卡片 ---- */
.video-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
    gap:24px
}
.video-card{
    background:#fff;border-radius:var(--radius);
    overflow:hidden;box-shadow:var(--shadow);
    transition:var(--transition);cursor:pointer
}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.video-thumb{
    position:relative;overflow:hidden;
    aspect-ratio:16/9;background:#000
}
.video-thumb img{
    width:100%;height:100%;object-fit:cover;
    transition:transform 0.4s 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);transition:var(--transition)
}
.video-card:hover .video-play-btn{background:rgba(0,0,0,0.35)}
.play-icon{
    width:52px;height:52px;background:rgba(255,255,255,0.9);
    border-radius:50%;display:flex;align-items:center;justify-content:center;
    opacity:0;transform:scale(0.8);transition:var(--transition)
}
.video-card:hover .play-icon{opacity:1;transform:scale(1)}
.play-icon svg{margin-left:4px}
.video-duration{
    position:absolute;bottom:8px;right:8px;
    background:rgba(0,0,0,0.75);color:#fff;
    font-size:0.72rem;padding:2px 7px;border-radius:4px
}
.video-category{
    position:absolute;top:8px;left:8px;
    background:var(--primary);color:#fff;
    font-size:0.7rem;padding:2px 8px;border-radius:4px
}
.video-info{padding:14px}
.video-title{
    font-size:0.92rem;font-weight:600;color:var(--text-dark);
    margin-bottom:8px;line-height:1.5;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden
}
.video-meta{
    display:flex;align-items:center;gap:8px;
    font-size:0.75rem;color:var(--text-light);margin-bottom:8px
}
.video-stats{
    display:flex;gap:14px;font-size:0.75rem;color:var(--text-light)
}
.video-stats span{display:flex;align-items:center;gap:4px}

/* ---- 专家卡片 ---- */
.experts-grid{
    display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px
}
.expert-card{
    background:#fff;border-radius:var(--radius);
    padding:28px 24px;text-align:center;
    box-shadow:var(--shadow);transition:var(--transition);
    border:1px solid var(--border)
}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.expert-avatar{
    width:90px;height:90px;border-radius:50%;
    object-fit:cover;margin:0 auto 16px;
    border:3px solid var(--primary)
}
.expert-name{font-size:1.05rem;font-weight:700;color:var(--text-dark);margin-bottom:4px}
.expert-title{font-size:0.82rem;color:var(--primary);margin-bottom:10px}
.expert-desc{font-size:0.82rem;color:var(--text-mid);line-height:1.6;margin-bottom:14px}
.expert-awards{
    display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:14px
}
.award-tag{
    background:var(--bg-light);border:1px solid var(--border);
    border-radius:12px;padding:2px 10px;font-size:0.72rem;color:var(--text-mid)
}
.expert-actions{display:flex;gap:8px;justify-content:center}
.btn-sm{
    padding:6px 14px;border-radius:16px;font-size:0.78rem;
    font-weight:600;transition:var(--transition)
}
.btn-outline{
    border:1.5px solid var(--primary);color:var(--primary);background:none
}
.btn-outline:hover{background:var(--primary);color:#fff}

/* ---- 社区功能卡片 ---- */
.community-grid{
    display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px
}
.community-card{
    background:#fff;border-radius:var(--radius);
    padding:24px 20px;text-align:center;
    box-shadow:var(--shadow);transition:var(--transition);
    border-top:3px solid transparent
}
.community-card:hover{transform:translateY(-4px);border-top-color:var(--primary)}
.community-icon{
    width:56px;height:56px;border-radius:16px;
    background:var(--bg-light);display:flex;align-items:center;
    justify-content:center;margin:0 auto 14px;font-size:1.6rem
}
.community-title{font-size:0.95rem;font-weight:700;color:var(--text-dark);margin-bottom:8px}
.community-desc{font-size:0.8rem;color:var(--text-mid);line-height:1.6}

/* ---- AI功能区 ---- */
.ai-section{background:linear-gradient(135deg,var(--bg-dark),var(--bg-mid));padding:72px 0}
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.ai-card{
    background:rgba(255,255,255,0.06);border-radius:var(--radius);
    padding:28px 24px;border:1px solid rgba(255,255,255,0.1);
    transition:var(--transition)
}
.ai-card:hover{background:rgba(255,255,255,0.1);transform:translateY(-4px)}
.ai-icon{font-size:2rem;margin-bottom:14px}
.ai-title{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px}
.ai-desc{font-size:0.85rem;color:rgba(255,255,255,0.7);line-height:1.7}

/* ---- 用户评论 ---- */
.reviews-grid{
    display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px
}
.review-card{
    background:#fff;border-radius:var(--radius);
    padding:22px 20px;box-shadow:var(--shadow);
    border-left:4px solid var(--primary)
}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{
    width:44px;height:44px;border-radius:50%;
    background:linear-gradient(135deg,var(--primary),var(--primary-light));
    display:flex;align-items:center;justify-content:center;
    color:#fff;font-weight:700;font-size:1rem;flex-shrink:0
}
.review-name{font-weight:600;color:var(--text-dark);font-size:0.9rem}
.review-role{font-size:0.75rem;color:var(--text-light)}
.review-stars{color:var(--secondary);font-size:0.85rem;margin-bottom:8px}
.review-text{font-size:0.85rem;color:var(--text-mid);line-height:1.7}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
    border:1px solid var(--border);border-radius:var(--radius);
    margin-bottom:12px;overflow:hidden
}
.faq-question{
    padding:18px 20px;font-weight:600;color:var(--text-dark);
    cursor:pointer;display:flex;justify-content:space-between;
    align-items:center;background:#fff;transition:var(--transition);
    font-size:0.95rem
}
.faq-question:hover{background:var(--bg-light);color:var(--primary)}
.faq-question.active{background:var(--bg-light);color:var(--primary)}
.faq-arrow{transition:transform 0.3s;font-size:0.8rem;color:var(--text-light)}
.faq-question.active .faq-arrow{transform:rotate(180deg)}
.faq-answer{
    padding:0 20px;max-height:0;overflow:hidden;
    transition:max-height 0.4s ease,padding 0.3s;
    font-size:0.88rem;color:var(--text-mid);line-height:1.8
}
.faq-answer.open{max-height:300px;padding:16px 20px}

/* ---- 合作品牌 ---- */
.partners-grid{
    display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center
}
.partner-logo{
    background:var(--bg-light);border:1px solid var(--border);
    border-radius:var(--radius);padding:14px 24px;
    font-size:0.85rem;font-weight:600;color:var(--text-mid);
    transition:var(--transition)
}
.partner-logo:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---- 分享栏 ---- */
.share-bar{
    background:var(--bg-light);border-top:1px solid var(--border);
    border-bottom:1px solid var(--border);padding:14px 0
}
.share-inner{
    max-width:1200px;margin:0 auto;padding:0 20px;
    display:flex;align-items:center;gap:16px;flex-wrap:wrap
}
.share-label{font-size:0.85rem;color:var(--text-mid);font-weight:600}
.share-btns{display:flex;gap:8px}
.share-btn{
    display:flex;align-items:center;gap:6px;
    padding:6px 14px;border-radius:16px;font-size:0.78rem;font-weight:600;
    border:1.5px solid var(--border);color:var(--text-mid);
    transition:var(--transition)
}
.share-btn:hover{border-color:var(--primary);color:var(--primary)}
.share-btn.wechat:hover{background:#07c160;border-color:#07c160;color:#fff}
.share-btn.weibo:hover{background:#e6162d;border-color:#e6162d;color:#fff}
.share-btn.douyin:hover{background:#000;border-color:#000;color:#fff}
.share-btn.bilibili:hover{background:#00a1d6;border-color:#00a1d6;color:#fff}

/* ---- 页脚 ---- */
.site-footer{background:var(--bg-dark);color:rgba(255,255,255,0.8);padding:60px 0 0}
.footer-grid{
    display:grid;
    grid-template-columns:2fr 1fr 1fr 1fr;
    gap:40px;margin-bottom:40px
}
.footer-brand p{
    font-size:0.82rem;color:rgba(255,255,255,0.55);
    line-height:1.8;margin-top:14px;margin-bottom:16px
}
.footer-social{display:flex;gap:8px}
.footer-social a{
    width:32px;height:32px;border-radius:50%;
    background:rgba(255,255,255,0.1);display:flex;
    align-items:center;justify-content:center;
    font-size:0.75rem;color:rgba(255,255,255,0.7);
    transition:var(--transition)
}
.footer-social a:hover{background:var(--primary);color:#fff}
.footer-col h4{
    font-size:0.9rem;font-weight:700;color:#fff;
    margin-bottom:16px;padding-bottom:8px;
    border-bottom:1px solid rgba(255,255,255,0.1)
}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{
    font-size:0.82rem;color:rgba(255,255,255,0.55);
    transition:var(--transition)
}
.footer-links a:hover{color:var(--secondary)}
.footer-logo-img{
    width:36px;height:36px;border-radius:50%;
    object-fit:cover;border:2px solid var(--primary)
}
.qrcode-item{text-align:center}
.qrcode-item img{
    width:120px;height:120px;border-radius:8px;
    border:2px solid rgba(255,255,255,0.1);margin-bottom:8px
}
.qrcode-item p{font-size:0.72rem;color:rgba(255,255,255,0.5)}
.footer-bottom{
    border-top:1px solid rgba(255,255,255,0.08);
    padding:20px 0;display:flex;
    justify-content:space-between;align-items:center;
    flex-wrap:wrap;gap:12px;font-size:0.78rem;
    color:rgba(255,255,255,0.4)
}
.footer-bottom a{color:rgba(255,255,255,0.5)}
.footer-bottom a:hover{color:var(--secondary)}

/* ---- 返回顶部 ---- */
.back-to-top{
    position:fixed;bottom:28px;right:28px;
    width:44px;height:44px;border-radius:50%;
    background:var(--primary);color:#fff;
    font-size:1.1rem;display:flex;align-items:center;justify-content:center;
    box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;
    transition:var(--transition);z-index:999
}
.back-to-top.visible{opacity:1;pointer-events:auto}
.back-to-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

/* ---- 页面内页Hero ---- */
.page-hero{
    background:linear-gradient(135deg,var(--bg-dark),var(--primary));
    padding:60px 0;color:#fff;text-align:center
}
.page-hero h1{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;margin-bottom:12px}
.page-hero p{font-size:0.95rem;color:rgba(255,255,255,0.8);max-width:500px;margin:0 auto}

/* ---- 标签 ---- */
.tag{
    display:inline-block;background:var(--bg-light);
    border:1px solid var(--border);border-radius:12px;
    padding:3px 10px;font-size:0.72rem;color:var(--text-mid);
    margin:2px
}
.tag:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---- 淡入动画 ---- */
.fade-in{opacity:1;transform:translateY(0);transition:opacity 0.6s ease,transform 0.6s ease}

/* ---- 响应式 ---- */
@media(max-width:1024px){
    .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media(max-width:768px){
    .main-nav{display:none}
    .hamburger{display:flex}
    .hero-section{min-height:420px}
    .hero-content{padding:60px 20px}
    .footer-grid{grid-template-columns:1fr}
    .video-grid{grid-template-columns:1fr 1fr}
    .header-search{display:none}
    .hero-stats{gap:20px}
    .hero-stat-num{font-size:1.4rem}
    .footer-bottom{flex-direction:column;text-align:center}
}
@media(max-width:480px){
    .video-grid{grid-template-columns:1fr}
    .community-grid{grid-template-columns:1fr 1fr}
    .experts-grid{grid-template-columns:1fr}
    .reviews-grid{grid-template-columns:1fr}
    .hero-actions{flex-direction:column;align-items:flex-start}
}