/* ===== 同人动漫 - 汽车改装视频社区 原创CSS ===== */
/* 配色：#FF6B00橙色主色 #1A1D2E深蓝黑 #252840次深 #F5F5F7浅灰白 */
:root{--c-primary:#FF6B00;--c-primary-dark:#E05E00;--c-dark:#1A1D2E;--c-dark2:#252840;--c-light:#F5F5F7;--c-text:#333;--c-text2:#666;--c-border:#E0E0E0;--c-white:#FFF;--c-accent:#00B4D8;--font-main:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;--shadow:0 4px 20px rgba(0,0,0,.08);--shadow-lg:0 8px 40px rgba(0,0,0,.12);--radius:12px;--radius-sm:8px;--transition:all .3s ease}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-main);color:var(--c-text);background:var(--c-light);line-height:1.7}
a{color:var(--c-primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--c-primary-dark)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.dy-noise{display:none!important;visibility:hidden;width:0;height:0;overflow:hidden;position:absolute;left:-9999px}

/* ===== Header导航 ===== */
.site-header{background:var(--c-dark);position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1200px;margin:0 auto;padding:0 20px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{width:40px;height:40px;border-radius:50%}
.site-logo-text{color:var(--c-primary);font-size:22px;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{color:var(--c-white);font-size:14px;padding:8px 14px;border-radius:var(--radius-sm);transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{background:var(--c-primary);color:var(--c-white)}
.nav-hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-hamburger span{width:24px;height:2px;background:var(--c-white);transition:var(--transition)}
.search-bar{background:var(--c-dark2);padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08)}
.search-bar-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:12px}
.search-input{flex:1;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);border-radius:24px;padding:10px 20px;color:var(--c-white);font-size:14px;outline:none;transition:var(--transition)}
.search-input::placeholder{color:rgba(255,255,255,.4)}
.search-input:focus{border-color:var(--c-primary);background:rgba(255,255,255,.15)}
.search-btn{background:var(--c-primary);color:var(--c-white);border:none;padding:10px 24px;border-radius:24px;cursor:pointer;font-size:14px;font-weight:600;transition:var(--transition)}
.search-btn:hover{background:var(--c-primary-dark)}

/* ===== 面包屑 ===== */
.breadcrumb{padding:14px 0;font-size:13px;color:var(--c-text2)}
.breadcrumb a{color:var(--c-primary)}
.breadcrumb span{margin:0 6px;color:#999}

/* ===== Hero Banner ===== */
.hero-section{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;background:var(--c-dark)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.55}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,29,46,.92) 0%,rgba(255,107,0,.18) 100%)}
.hero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:60px 20px;width:100%}
.hero-badge{display:inline-block;background:var(--c-primary);color:var(--c-white);padding:6px 18px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:20px}
.hero-content h1{color:var(--c-white);font-size:42px;font-weight:800;line-height:1.3;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.hero-desc{color:rgba(255,255,255,.85);font-size:17px;line-height:1.8;max-width:650px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn-fire{display:inline-flex;align-items:center;gap:8px;background:var(--c-primary);color:var(--c-white);padding:14px 32px;border-radius:30px;font-size:15px;font-weight:700;transition:var(--transition);border:none;cursor:pointer}
.btn-fire:hover{background:var(--c-primary-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,107,0,.4);color:var(--c-white)}
.btn-ghost{display:inline-flex;align-items:center;gap:8px;background:transparent;color:var(--c-white);padding:14px 32px;border-radius:30px;font-size:15px;font-weight:600;border:2px solid rgba(255,255,255,.4);transition:var(--transition);cursor:pointer}
.btn-ghost:hover{border-color:var(--c-primary);color:var(--c-primary)}
.hero-stats{display:flex;gap:40px;margin-top:36px}
.hero-stat{text-align:center}
.hero-stat-num{color:var(--c-primary);font-size:28px;font-weight:800;display:block}
.hero-stat-label{color:rgba(255,255,255,.6);font-size:13px}

/* ===== 通用Section ===== */
.section{padding:60px 0}
.section-dark{background:var(--c-dark);color:var(--c-white)}
.section-alt{background:var(--c-white)}
.section-header{text-align:center;margin-bottom:40px}
.section-tag{display:inline-block;background:rgba(255,107,0,.1);color:var(--c-primary);padding:5px 16px;border-radius:16px;font-size:13px;font-weight:600;margin-bottom:12px}
.section-header h2{font-size:30px;font-weight:800;color:var(--c-dark);margin-bottom:10px}
.section-dark .section-header h2{color:var(--c-white)}
.section-header p{color:var(--c-text2);font-size:15px;max-width:600px;margin:0 auto}
.section-dark .section-header p{color:rgba(255,255,255,.6)}

/* ===== 视频卡片网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:var(--c-white);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;padding-top:56.25%;overflow:hidden;background:var(--c-dark)}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(255,107,0,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition);opacity:0}
.video-card:hover .video-play-btn{transform:translate(-50%,-50%) scale(1);opacity:1}
.video-play-btn svg{width:24px;height:24px;fill:var(--c-white);margin-left:3px}
.video-badge{position:absolute;top:10px;left:10px;background:var(--c-primary);color:var(--c-white);padding:3px 10px;border-radius:4px;font-size:11px;font-weight:600}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.75);color:var(--c-white);padding:2px 8px;border-radius:4px;font-size:12px}
.video-info{padding:16px}
.video-info h5{font-size:15px;font-weight:700;color:var(--c-dark);margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-info h6{font-size:12px;color:var(--c-text2);font-weight:400;margin-bottom:8px}
.video-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--c-text2)}
.video-meta span{display:flex;align-items:center;gap:3px}
.section-dark .video-card{background:var(--c-dark2)}
.section-dark .video-info h5{color:var(--c-white)}

/* ===== 专家卡片 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:var(--c-white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);text-align:center;padding:30px 20px;transition:var(--transition)}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.expert-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;object-fit:cover;border:3px solid var(--c-primary)}
.expert-name{font-size:18px;font-weight:700;color:var(--c-dark);margin-bottom:4px}
.expert-role{font-size:13px;color:var(--c-primary);font-weight:600;margin-bottom:10px}
.expert-desc{font-size:13px;color:var(--c-text2);line-height:1.6;margin-bottom:14px}
.expert-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin-bottom:16px}
.expert-tag{background:rgba(255,107,0,.08);color:var(--c-primary);padding:3px 10px;border-radius:12px;font-size:11px}
.expert-btns{display:flex;justify-content:center;gap:10px}
.expert-btn{padding:6px 16px;border-radius:20px;font-size:12px;font-weight:600;transition:var(--transition);border:none;cursor:pointer}
.expert-btn-primary{background:var(--c-primary);color:var(--c-white)}
.expert-btn-outline{background:transparent;border:1px solid var(--c-primary);color:var(--c-primary)}

/* ===== AI功能卡片 ===== */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.ai-card{background:linear-gradient(145deg,var(--c-dark) 0%,var(--c-dark2) 100%);border-radius:var(--radius);padding:30px;border:1px solid rgba(255,107,0,.15);transition:var(--transition)}
.ai-card:hover{border-color:var(--c-primary);transform:translateY(-4px)}
.ai-icon{width:52px;height:52px;background:rgba(255,107,0,.15);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:24px}
.ai-card h4{color:var(--c-white);font-size:18px;font-weight:700;margin-bottom:10px}
.ai-card p{color:rgba(255,255,255,.6);font-size:14px;line-height:1.7}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--c-white);border-radius:var(--radius-sm);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:18px 24px;font-size:15px;font-weight:700;color:var(--c-dark);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.faq-q:hover{color:var(--c-primary)}
.faq-q::after{content:'+';font-size:22px;color:var(--c-primary);font-weight:300;transition:var(--transition)}
.faq-item.open .faq-q::after{content:'-';transform:rotate(180deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease;font-size:14px;color:var(--c-text2);line-height:1.8}
.faq-item.open .faq-a{max-height:300px;padding:0 24px 18px}

/* ===== 用户评价 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:var(--c-white);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:var(--transition)}
.review-card:hover{box-shadow:var(--shadow-lg)}
.review-stars{color:var(--c-primary);font-size:16px;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:14px;color:var(--c-text);line-height:1.7;margin-bottom:14px;font-style:italic}
.review-author{font-size:13px;color:var(--c-text2);font-weight:600}

/* ===== 社区话题 ===== */
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.topic-card{background:var(--c-white);border-radius:var(--radius-sm);padding:20px;text-align:center;box-shadow:var(--shadow);transition:var(--transition);border:2px solid transparent}
.topic-card:hover{border-color:var(--c-primary);transform:translateY(-3px)}
.topic-icon{font-size:32px;margin-bottom:10px;display:block}
.topic-card h4{font-size:15px;font-weight:700;color:var(--c-dark);margin-bottom:6px}
.topic-card p{font-size:12px;color:var(--c-text2)}

/* ===== 合作品牌墙 ===== */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:24px;padding:20px 0}
.brand-item{background:var(--c-white);border-radius:var(--radius-sm);padding:16px 28px;box-shadow:var(--shadow);font-size:16px;font-weight:700;color:var(--c-dark);transition:var(--transition)}
.brand-item:hover{color:var(--c-primary);transform:scale(1.05)}

/* ===== CTA区域 ===== */
.cta-section{background:linear-gradient(135deg,var(--c-primary) 0%,#FF8C38 100%);padding:60px 0;text-align:center}
.cta-section h3{color:var(--c-white);font-size:28px;font-weight:800;margin-bottom:14px}
.cta-section p{color:rgba(255,255,255,.85);font-size:16px;margin-bottom:28px}
.cta-btns{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}

/* ===== 标签云 ===== */
.tag-cloud{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:20px 0}
.tag{display:inline-block;background:rgba(255,107,0,.08);color:var(--c-primary);padding:6px 16px;border-radius:20px;font-size:13px;transition:var(--transition)}
.tag:hover{background:var(--c-primary);color:var(--c-white)}

/* ===== 分享按钮 ===== */
.share-bar{display:flex;align-items:center;gap:12px;padding:16px 0}
.share-label{font-size:14px;color:var(--c-text2);font-weight:600}
.share-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:var(--c-white);transition:var(--transition);cursor:pointer}
.share-btn:hover{transform:scale(1.15)}
.share-wx{background:#07C160}
.share-wb{background:#E6162D}
.share-dy{background:#161823}
.share-bl{background:#00A1D6}

/* ===== Footer ===== */
.site-footer{background:var(--c-dark);color:rgba(255,255,255,.7);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:40px}
.footer-col h4{color:var(--c-white);font-size:16px;font-weight:700;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--c-primary)}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:13px;padding:4px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--c-primary)}
.footer-col p{font-size:13px;line-height:1.8;color:rgba(255,255,255,.6)}
.footer-qr{display:flex;gap:16px;margin-top:12px}
.footer-qr img{width:80px;height:80px;border-radius:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:13px}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-logo img{width:36px;height:36px;border-radius:50%}
.footer-logo-name{color:var(--c-primary);font-size:20px;font-weight:700}

/* ===== 内页Hero ===== */
.page-hero{background:var(--c-dark);padding:50px 0 30px;text-align:center}
.page-hero h1{color:var(--c-white);font-size:32px;font-weight:800;margin-bottom:10px}
.page-hero p{color:rgba(255,255,255,.6);font-size:15px}

/* ===== 视频弹窗 ===== */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:9999;align-items:center;justify-content:center}
.modal-overlay.show{display:flex}
.modal-box{background:var(--c-dark);border-radius:var(--radius);max-width:800px;width:90%;overflow:hidden;position:relative}
.modal-close{position:absolute;top:12px;right:16px;color:var(--c-white);font-size:28px;cursor:pointer;z-index:10;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.5);border-radius:50%}
.modal-video{width:100%;aspect-ratio:16/9;background:#000;display:flex;align-items:center;justify-content:center;color:var(--c-white);font-size:18px}
.modal-info{padding:20px}
.modal-info h3{color:var(--c-white);font-size:18px;margin-bottom:8px}
.modal-info p{color:rgba(255,255,255,.6);font-size:14px}

/* ===== 回到顶部 ===== */
.back-top{position:fixed;bottom:30px;right:30px;width:46px;height:46px;background:var(--c-primary);color:var(--c-white);border-radius:50%;display:none;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:0 4px 16px rgba(255,107,0,.4);z-index:999;transition:var(--transition);border:none}
.back-top.show{display:flex}
.back-top:hover{background:var(--c-primary-dark);transform:translateY(-3px)}

/* ===== 动画 ===== */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== 步骤指南 ===== */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.step-card{background:var(--c-white);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow);position:relative}
.step-num{width:40px;height:40px;background:var(--c-primary);color:var(--c-white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;margin:0 auto 14px}
.step-card h4{font-size:15px;font-weight:700;color:var(--c-dark);margin-bottom:8px}
.step-card p{font-size:13px;color:var(--c-text2);line-height:1.6}

/* ===== 视频筛选栏 ===== */
.filter-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:24px}
.filter-label{font-size:14px;font-weight:700;color:var(--c-dark)}
.filter-btn{padding:6px 18px;border-radius:20px;font-size:13px;border:1px solid var(--c-border);background:var(--c-white);color:var(--c-text);cursor:pointer;transition:var(--transition)}
.filter-btn:hover,.filter-btn.active{background:var(--c-primary);color:var(--c-white);border-color:var(--c-primary)}

/* ===== 响应式 ===== */
@media(max-width:768px){
.header-inner{height:56px}
.main-nav{display:none;position:absolute;top:56px;left:0;right:0;background:var(--c-dark);flex-direction:column;padding:16px;gap:4px}
.main-nav.open{display:flex}
.nav-hamburger{display:flex}
.hero-content h1{font-size:26px}
.hero-stats{gap:20px}
.hero-stat-num{font-size:22px}
.footer-grid{grid-template-columns:repeat(2,1fr);gap:20px}
.video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.section{padding:40px 0}
.section-header h2{font-size:24px}
.hero-section{min-height:400px}
.hero-desc{font-size:15px}
.expert-grid{grid-template-columns:1fr 1fr}
.ai-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
.footer-grid{grid-template-columns:1fr}
.hero-actions{flex-direction:column}
.hero-stats{flex-direction:column;gap:12px;align-items:flex-start}
.expert-grid{grid-template-columns:1fr}
.video-grid{grid-template-columns:1fr}
.review-grid{grid-template-columns:1fr}
}