/* =============================================
   国产自拍 修车改装视频社区 - 原创CSS样式表
   官网: cevw68.cn
   原创配色：深钢铁蓝 #1B2A4A + 火焰橙 #E8501A + 银灰 #F4F6F9
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary:     #E8501A;   /* 火焰橙 - 主色 */
  --primary-dark:#C43D10;   /* 深橙 */
  --secondary:   #1B2A4A;   /* 深钢铁蓝 - 辅色 */
  --accent:      #F5A623;   /* 金黄 - 点缀 */
  --bg:          #F4F6F9;   /* 浅灰背景 */
  --bg-card:     #FFFFFF;
  --text:        #1A1A2E;
  --text-light:  #5A6478;
  --text-muted:  #9AA3B2;
  --border:      #E2E8F0;
  --shadow-sm:   0 2px 8px rgba(27,42,74,0.08);
  --shadow-md:   0 8px 24px rgba(27,42,74,0.12);
  --shadow-lg:   0 20px 60px rgba(27,42,74,0.16);
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --transition:  0.25s 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);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;height:auto;display:block;}
button{cursor:pointer;border:none;background:none;font-family:inherit;}
ul,ol{list-style:none;}

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

/* ---- 顶部公告栏 ---- */
.top-bar{background:var(--secondary);color:rgba(255,255,255,0.85);font-size:0.78rem;padding:7px 0;}
.top-bar-inner{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;}
.top-bar-links{display:flex;gap:16px;}
.top-bar-links a{color:rgba(255,255,255,0.7);transition:color var(--transition);}
.top-bar-links a:hover{color:#fff;}

/* ---- Header ---- */
.header{background:#fff;position:sticky;top:0;z-index:900;border-bottom:1px solid var(--border);transition:box-shadow var(--transition);}
.header.scrolled{box-shadow:var(--shadow-md);}
.header-inner{display:flex;align-items:center;gap:24px;height:68px;}

/* ---- Logo ---- */
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.logo img{width:52px;height:auto;}
.logo-text{display:flex;flex-direction:column;line-height:1.2;}
.logo-name{font-size:1.5rem;font-weight:900;color:var(--primary);letter-spacing:-0.5px;}
.logo-tagline{font-size:0.68rem;color:var(--text-muted);white-space:nowrap;}

/* ---- 主导航 ---- */
.main-nav{display:flex;align-items:center;gap:4px;flex:1;}
.nav-item{padding:6px 12px;border-radius:var(--radius-sm);font-size:0.88rem;font-weight:500;color:var(--text-light);transition:all var(--transition);white-space:nowrap;}
.nav-item:hover,.nav-item.active{color:var(--primary);background:rgba(232,80,26,0.08);}

/* ---- 汉堡菜单 ---- */
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:var(--radius-sm);}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:all var(--transition);}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---- 搜索栏 ---- */
.search-bar-wrap{background:#fff;border-bottom:1px solid var(--border);padding:10px 0;}
.search-bar{display:flex;gap:0;max-width:600px;margin:0 auto;border-radius:50px;overflow:hidden;border:2px solid var(--primary);box-shadow:0 2px 12px rgba(232,80,26,0.12);}
#mainSearchInput{flex:1;padding:10px 20px;font-size:0.9rem;border:none;outline:none;font-family:var(--font);}
#searchBtn{padding:10px 24px;background:var(--primary);color:#fff;font-size:0.9rem;font-weight:600;transition:background var(--transition);}
#searchBtn:hover{background:var(--primary-dark);}

/* ---- Hero Banner ---- */
.hero{position:relative;min-height:580px;display:flex;align-items:center;overflow:hidden;color:#fff;}
.hero-bg{position:absolute;inset:0;background:url('../images/banner_bg.jpg') center/cover no-repeat;z-index:0;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(27,42,74,0.88) 0%,rgba(232,80,26,0.55) 100%);z-index:1;}
.hero .container{position:relative;z-index:2;padding-top:40px;padding-bottom:40px;}
.hero-content{max-width:680px;}
.hero-badge{display:inline-block;background:rgba(245,166,35,0.2);border:1px solid rgba(245,166,35,0.5);color:var(--accent);padding:5px 14px;border-radius:50px;font-size:0.78rem;font-weight:600;margin-bottom:20px;letter-spacing:0.5px;}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:900;line-height:1.15;margin-bottom:20px;letter-spacing:-1px;}
.hero h1 span{color:var(--accent);}
.hero-desc{font-size:0.95rem;line-height:1.8;opacity:0.88;margin-bottom:32px;max-width:560px;}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px;}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap;}
.hero-stat-num{font-size:1.6rem;font-weight:800;color:var(--accent);}
.hero-stat-label{font-size:0.78rem;opacity:0.7;margin-top:2px;}

/* ---- 统计栏 ---- */
.stats-bar{background:var(--secondary);color:#fff;padding:24px 0;}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.stat-item{}
.stat-num{font-size:1.8rem;font-weight:800;color:var(--accent);}
.stat-label{font-size:0.78rem;opacity:0.65;margin-top:4px;}

/* ---- 通用Section ---- */
.section{padding:64px 0;}
.section-alt{background:#fff;}
.section-title{font-size:clamp(1.3rem,3vw,1.7rem);font-weight:800;color:var(--secondary);margin-bottom:8px;line-height:1.3;}
.section-title span{color:var(--primary);}
.section-subtitle{font-size:0.9rem;color:var(--text-light);max-width:600px;}
.text-center{text-align:center;}
.text-center .section-subtitle{margin:0 auto;}
.mb-24{margin-bottom:24px;}
.flex-between{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;}
.gap-24{gap:24px;}

/* ---- Grid ---- */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 24px;border-radius:50px;font-size:0.9rem;font-weight:600;transition:all var(--transition);cursor:pointer;border:2px solid transparent;white-space:nowrap;}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary);}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(232,80,26,0.35);}
.btn-white{background:#fff;color:var(--secondary);border-color:#fff;}
.btn-white:hover{background:rgba(255,255,255,0.9);transform:translateY(-1px);}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary);}
.btn-outline:hover{background:var(--primary);color:#fff;}
.btn-sm{padding:7px 16px;font-size:0.82rem;}

/* ---- 标签 ---- */
.tag{display:inline-block;padding:3px 10px;border-radius:50px;font-size:0.75rem;font-weight:600;background:rgba(232,80,26,0.1);color:var(--primary);}
.tag-orange{background:rgba(245,166,35,0.12);color:#C47A00;}
.tag-blue{background:rgba(27,42,74,0.1);color:var(--secondary);}
.tag-green{background:rgba(34,197,94,0.1);color:#16A34A;}

/* ---- 视频卡片 ---- */
.video-card{background:var(--bg-card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);cursor:pointer;}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#1a1a2e;}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease;}
.video-thumb video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity 0.3s;}
.video-card:hover .video-thumb video{opacity:1;}
.video-card:hover .video-thumb img{transform:scale(1.04);}
.video-play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition);background:rgba(0,0,0,0.25);}
.video-card:hover .video-play-btn{opacity:1;}
.play-icon{width:52px;height:52px;background:rgba(232,80,26,0.92);border-radius:50%;display:flex;align-items:center;justify-content:center;transform:scale(0.85);transition:transform var(--transition);}
.play-icon::after{content:'';border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px;}
.video-card:hover .play-icon{transform:scale(1);}
.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;font-weight:600;}
.video-category{position:absolute;top:8px;left:8px;}
.video-info{padding:14px;}
.video-title{font-size:0.88rem;font-weight:600;line-height:1.5;color:var(--text);margin-bottom:8px;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:0.75rem;color:var(--text-muted);}
.video-stats{display:flex;gap:10px;}
.video-stat{display:flex;align-items:center;gap:3px;}
.stat-views::before{content:'👁 ';}
.stat-likes::before{content:'❤️ ';}
.stat-comments::before{content:'💬 ';}

/* ---- 功能卡片 ---- */
.feature-card{background:var(--bg-card);border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-sm);transition:all var(--transition);border:1px solid var(--border);}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:rgba(232,80,26,0.2);}
.feature-icon{font-size:2.2rem;margin-bottom:14px;}
.feature-title{font-size:1rem;font-weight:700;color:var(--secondary);margin-bottom:10px;}
.feature-desc{font-size:0.85rem;color:var(--text-light);line-height:1.7;}

/* ---- 步骤卡片 ---- */
.step-card{display:flex;gap:16px;align-items:flex-start;padding:16px;background:var(--bg);border-radius:var(--radius-md);transition:all var(--transition);}
.step-card:hover{background:#fff;box-shadow:var(--shadow-sm);}
.step-num{width:40px;height:40px;min-width:40px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.9rem;font-weight:700;}
.step-content h4{font-size:0.92rem;font-weight:700;color:var(--secondary);margin-bottom:5px;}
.step-content p{font-size:0.83rem;color:var(--text-light);line-height:1.6;}

/* ---- 专家卡片 ---- */
.expert-card{background:var(--bg-card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:all var(--transition);}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.expert-avatar{position:relative;aspect-ratio:4/3;overflow:hidden;}
.expert-avatar img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}
.expert-card:hover .expert-avatar img{transform:scale(1.05);}
.expert-badge{position:absolute;top:10px;right:10px;background:var(--primary);color:#fff;font-size:0.72rem;padding:3px 10px;border-radius:50px;font-weight:600;}
.expert-info{padding:16px;}
.expert-name{font-size:1.05rem;font-weight:800;color:var(--secondary);margin-bottom:3px;}
.expert-role{font-size:0.78rem;color:var(--primary);font-weight:600;margin-bottom:10px;}
.expert-desc{font-size:0.8rem;color:var(--text-light);line-height:1.6;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.expert-awards{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px;}
.expert-btns{display:flex;gap:8px;}

/* ---- 品牌Logo展示 ---- */
.brand-logos{display:grid;grid-template-columns:repeat(6,1fr);gap:16px;}
.brand-logo-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;text-align:center;font-size:0.82rem;font-weight:600;color:var(--text-light);transition:all var(--transition);}
.brand-logo-item:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-sm);}

/* ---- 联系卡片 ---- */
.contact-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-md);border:1px solid var(--border);}
.contact-item{display:flex;gap:14px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--border);}
.contact-item:last-child{border-bottom:none;}
.contact-icon{width:36px;height:36px;min-width:36px;background:rgba(232,80,26,0.1);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;}
.contact-label{font-size:0.75rem;color:var(--text-muted);margin-bottom:2px;}
.contact-value{font-size:0.88rem;font-weight:600;color:var(--text);}

/* ---- 用户评价 ---- */
.review-card{background:var(--bg-card);border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-sm);border:1px solid var(--border);transition:all var(--transition);}
.review-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);}
.review-stars{color:#F5A623;font-size:0.9rem;margin-bottom:10px;letter-spacing:2px;}
.review-text{font-size:0.83rem;color:var(--text-light);line-height:1.7;margin-bottom:14px;font-style:italic;}
.review-author{display:flex;gap:10px;align-items:center;}
.review-avatar{width:36px;height:36px;min-width:36px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.85rem;font-weight:700;}
.review-name{font-size:0.85rem;font-weight:700;color:var(--secondary);}
.review-date{font-size:0.72rem;color:var(--text-muted);}

/* ---- FAQ ---- */
.faq-item{border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:10px;overflow:hidden;background:var(--bg-card);}
.faq-question{padding:16px 20px;font-size:0.92rem;font-weight:600;color:var(--secondary);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background var(--transition);}
.faq-question:hover{background:rgba(232,80,26,0.04);}
.faq-question.open{color:var(--primary);}
.faq-icon{font-size:1.2rem;font-weight:400;color:var(--primary);transition:transform var(--transition);}
.faq-question.open .faq-icon{transform:rotate(45deg);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease,padding 0.25s;}
.faq-answer.open{max-height:300px;padding:0 20px 16px;}
.faq-answer{font-size:0.86rem;color:var(--text-light);line-height:1.8;}

/* ---- 社区话题 ---- */
.community-topic{padding:16px;background:var(--bg-card);border-radius:var(--radius-md);margin-bottom:12px;border:1px solid var(--border);transition:all var(--transition);}
.community-topic:hover{border-color:var(--primary);transform:translateX(4px);}
.topic-header{display:flex;gap:10px;align-items:flex-start;margin-bottom:8px;}
.topic-title{font-size:0.88rem;font-weight:600;color:var(--text);line-height:1.5;}
.topic-meta{display:flex;gap:16px;font-size:0.75rem;color:var(--text-muted);}

/* ---- 面包屑 ---- */
.breadcrumb{padding:10px 0;font-size:0.82rem;color:var(--text-muted);}
.breadcrumb a{color:var(--primary);}
.breadcrumb-sep{margin:0 6px;color:var(--border);}

/* ---- 页面Hero（内页） ---- */
.page-hero{background:linear-gradient(135deg,var(--secondary) 0%,#2D4A7A 100%);color:#fff;padding:48px 0;}
.page-hero h1{font-size:clamp(1.5rem,4vw,2.2rem);font-weight:900;margin-bottom:10px;}
.page-hero h1 span{color:var(--accent);}
.page-hero p{font-size:0.95rem;opacity:0.8;max-width:600px;}

/* ---- 分享栏 ---- */
.share-bar{background:var(--bg);border-top:1px solid var(--border);padding:14px 0;}
.share-inner{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.share-label{font-size:0.82rem;color:var(--text-muted);}
.share-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 14px;border-radius:50px;font-size:0.78rem;font-weight:600;border:1px solid var(--border);background:#fff;color:var(--text-light);transition:all var(--transition);cursor:pointer;}
.share-btn:hover{border-color:var(--primary);color:var(--primary);}

/* ---- 页脚 ---- */
.footer{background:var(--secondary);color:rgba(255,255,255,0.8);padding:56px 0 0;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.1);}
.footer-brand .logo-name{font-size:1.8rem;font-weight:900;color:var(--primary);}
.footer-brand p{font-size:0.83rem;line-height:1.8;opacity:0.7;margin-top:12px;}
.footer-qr{display:flex;gap:16px;margin-top:20px;}
.footer-qr-item{text-align:center;}
.footer-qr-item p{font-size:0.72rem;opacity:0.6;margin-top:6px;}
.footer-col h4{font-size:0.88rem;font-weight:700;color:#fff;margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--primary);display:inline-block;}
.footer-links{display:flex;flex-direction:column;gap:8px;}
.footer-links a{font-size:0.82rem;opacity:0.65;transition:opacity var(--transition);}
.footer-links a:hover{opacity:1;color:var(--accent);}
.footer-bottom{background:rgba(0,0,0,0.25);padding:16px 0;text-align:center;font-size:0.78rem;opacity:0.6;}
.footer-bottom a{color:var(--accent);}

/* ---- 回到顶部 ---- */
.back-to-top{position:fixed;bottom:28px;right:28px;width:44px;height:44px;background:var(--primary);color:#fff;border-radius:50%;font-size:1.1rem;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);opacity:0;transform:translateY(10px);transition:all var(--transition);z-index:800;pointer-events:none;}
.back-to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto;}
.back-to-top:hover{background:var(--primary-dark);transform:translateY(-2px);}

/* ---- 淡入动画 ---- */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity 0.5s ease,transform 0.5s ease;}
.fade-in.visible{opacity:1;transform:translateY(0);}

/* ---- 响应式 ---- */
@media (max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .brand-logos{grid-template-columns:repeat(4,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
}

@media (max-width:768px){
  .top-bar-links{display:none;}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:12px 0;box-shadow:var(--shadow-md);border-top:1px solid var(--border);}
  .main-nav.open{display:flex;}
  .nav-item{width:100%;padding:12px 20px;border-radius:0;}
  .nav-toggle{display:flex;}
  .header-inner{position:relative;}
  .hero{min-height:480px;}
  .hero h1{font-size:1.8rem;}
  .hero-stats{gap:20px;}
  .grid-2,.grid-3{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .brand-logos{grid-template-columns:repeat(3,1fr);}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr;}
  .section{padding:40px 0;}
  .flex-between{flex-direction:column;align-items:flex-start;}
}

@media (max-width:480px){
  .grid-4{grid-template-columns:1fr;}
  .brand-logos{grid-template-columns:repeat(2,1fr);}
  .hero-btns{flex-direction:column;}
  .stats-grid{grid-template-columns:1fr 1fr;}
  .hero-stats{gap:16px;}
  .hero-stat-num{font-size:1.2rem;}
}