/* ============================================
   困困兔 - 汽车改装视频社区 原创CSS
   配色方案：深夜蓝 #0A1628 / 赛道橙 #FF4D00 / 银灰 #C0C8D4
   ============================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;color:#e0e6ed;background:#0A1628;line-height:1.8}
a{color:#FF4D00;text-decoration:none;transition:color .3s}
a:hover{color:#ff7a3d}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:rgba(10,22,40,0.97);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(255,77,0,0.2);backdrop-filter:blur(10px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 0;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:48px;width:auto}
.site-logo span{font-size:1.4rem;font-weight:800;color:#FF4D00}
.main-nav{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.main-nav a{color:#c0c8d4;padding:8px 14px;border-radius:6px;font-size:.9rem;font-weight:500;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(255,77,0,0.15)}
.menu-toggle{display:none;background:none;border:none;color:#FF4D00;font-size:1.6rem;cursor:pointer}

/* Search Bar */
.search-bar-wrap{background:rgba(10,22,40,0.8);padding:12px 0;border-bottom:1px solid rgba(192,200,212,0.08)}
.search-bar{display:flex;max-width:600px;margin:0 auto}
.search-bar input{flex:1;padding:10px 18px;border:2px solid rgba(255,77,0,0.3);border-right:none;border-radius:8px 0 0 8px;background:rgba(255,255,255,0.05);color:#fff;font-size:.95rem;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:#FF4D00}
.search-bar button{padding:10px 24px;background:linear-gradient(135deg,#FF4D00,#ff7a3d);color:#fff;border:none;border-radius:0 8px 8px 0;cursor:pointer;font-size:.95rem;font-weight:600;transition:opacity .3s}
.search-bar button:hover{opacity:.85}

/* Breadcrumb */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#8892a4}
.breadcrumb a{color:#FF4D00}
.breadcrumb span{margin:0 6px;color:#556}

/* Hero Section */
.hero-section{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;filter:brightness(0.4)}
.hero-content{position:relative;z-index:2;max-width:700px;padding:60px 20px}
.hero-content h1{font-size:2.6rem;font-weight:900;line-height:1.3;margin-bottom:16px;background:linear-gradient(135deg,#FF4D00,#ff7a3d,#FFB800);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content p{font-size:1.1rem;color:#c0c8d4;margin-bottom:24px;line-height:1.8}
.hero-btn{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#FF4D00,#ff7a3d);color:#fff;border-radius:8px;font-weight:700;font-size:1rem;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(255,77,0,0.4);color:#fff}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.hero-tags span{background:rgba(255,77,0,0.15);color:#ff7a3d;padding:4px 14px;border-radius:20px;font-size:.8rem;border:1px solid rgba(255,77,0,0.25)}

/* Section */
.section-padding{padding:60px 0}
.bg-dark{background:#0d1b2e}
.bg-gradient{background:linear-gradient(180deg,#0A1628 0%,#0d1b2e 100%)}
.section-title{font-size:1.8rem;font-weight:800;text-align:center;margin-bottom:12px;color:#fff}
.section-title em{font-style:normal;color:#FF4D00}
.section-desc{text-align:center;color:#8892a4;margin-bottom:40px;font-size:1rem;max-width:700px;margin-left:auto;margin-right:auto}
.sub-section-title{font-size:1.3rem;font-weight:700;color:#FFB800;margin:30px 0 16px;padding-left:14px;border-left:4px solid #FF4D00}

/* Video Grid */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:rgba(255,255,255,0.04);border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid rgba(192,200,212,0.06)}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(255,77,0,0.15)}
.card-thumb{position:relative;padding-top:56.25%;overflow:hidden}
.card-thumb img,.card-thumb video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(255,77,0,0.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s,transform .3s;cursor:pointer}
.play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.card-thumb:hover .play-btn{opacity:1;transform:translate(-50%,-50%) scale(1.1)}
.card-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.card-info{padding:14px}
.card-info h3{font-size:1rem;font-weight:700;color:#e0e6ed;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;justify-content:space-between;font-size:.8rem;color:#6b7a8d}
.card-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.card-tags span{background:rgba(255,77,0,0.1);color:#ff7a3d;padding:2px 10px;border-radius:12px;font-size:.72rem}

/* Feature Grid */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.feature-card{background:rgba(255,255,255,0.03);border:1px solid rgba(192,200,212,0.08);border-radius:12px;padding:28px;text-align:center;transition:all .3s}
.feature-card:hover{border-color:rgba(255,77,0,0.3);background:rgba(255,77,0,0.05)}
.feature-card .icon{font-size:2.4rem;margin-bottom:14px}
.feature-card h4{font-size:1.05rem;font-weight:700;color:#fff;margin-bottom:8px}
.feature-card p{font-size:.88rem;color:#8892a4;line-height:1.6}

/* Expert Grid */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.expert-card{background:rgba(255,255,255,0.03);border:1px solid rgba(192,200,212,0.08);border-radius:12px;padding:24px;text-align:center;transition:all .3s}
.expert-card:hover{border-color:rgba(255,77,0,0.3)}
.expert-card .avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;overflow:hidden;border:3px solid rgba(255,77,0,0.3)}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:1.05rem;font-weight:700;color:#fff;margin-bottom:4px}
.expert-card .title{color:#FF4D00;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#8892a4;line-height:1.6;margin-bottom:14px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.expert-btns a{padding:6px 16px;border-radius:6px;font-size:.8rem;font-weight:600;transition:all .3s}
.expert-btns .btn-primary{background:#FF4D00;color:#fff}
.expert-btns .btn-outline{border:1px solid #FF4D00;color:#FF4D00}
.expert-btns a:hover{opacity:.8;color:#fff}

/* Partners */
.partner-wall{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin-top:20px}
.partner-item{background:rgba(255,255,255,0.05);border:1px solid rgba(192,200,212,0.1);border-radius:8px;padding:12px 24px;font-size:.9rem;color:#c0c8d4;transition:all .3s}
.partner-item:hover{border-color:#FF4D00;color:#FF4D00}
.partner-label{font-size:.85rem;color:#8892a4;text-align:center;margin-top:12px}

/* HowTo */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;margin-top:24px}
.howto-step{background:rgba(255,255,255,0.03);border:1px solid rgba(192,200,212,0.08);border-radius:12px;padding:24px;text-align:center}
.howto-step .step-num{display:inline-block;width:40px;height:40px;line-height:40px;border-radius:50%;background:#FF4D00;color:#fff;font-weight:800;font-size:1.1rem;margin-bottom:12px}
.howto-step h5{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px}
.howto-step p{font-size:.85rem;color:#8892a4}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:rgba(255,255,255,0.03);border:1px solid rgba(192,200,212,0.08);border-radius:12px;padding:24px}
.review-card .stars{color:#FFB800;font-size:1rem;margin-bottom:10px}
.review-card p{font-size:.9rem;color:#c0c8d4;line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .reviewer{font-size:.82rem;color:#6b7a8d;font-style:normal}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid rgba(192,200,212,0.1);padding:18px 0}
.faq-q{font-size:1rem;font-weight:700;color:#fff;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q .arrow{transition:transform .3s;color:#FF4D00}
.faq-a{font-size:.9rem;color:#8892a4;line-height:1.7;padding-top:12px;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}

/* Share */
.share-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btns a{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:8px;font-size:.85rem;font-weight:600;color:#fff;transition:opacity .3s}
.share-btns a:hover{opacity:.8;color:#fff}
.btn-wechat{background:#07C160}
.btn-weibo{background:#E6162D}
.btn-douyin{background:#161823}
.btn-bilibili{background:#00A1D6}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.contact-card{background:rgba(255,255,255,0.03);border:1px solid rgba(192,200,212,0.08);border-radius:12px;padding:24px}
.contact-card h4{font-size:1.05rem;font-weight:700;color:#fff;margin-bottom:12px}
.contact-card p{font-size:.88rem;color:#8892a4;line-height:1.7}
.contact-form{max-width:600px;margin:30px auto 0}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:.88rem;color:#c0c8d4;margin-bottom:6px}
.form-group input,.form-group textarea{width:100%;padding:10px 14px;background:rgba(255,255,255,0.05);border:1px solid rgba(192,200,212,0.15);border-radius:8px;color:#fff;font-size:.9rem;outline:none;transition:border-color .3s}
.form-group input:focus,.form-group textarea:focus{border-color:#FF4D00}
.form-group textarea{min-height:120px;resize:vertical}

/* Info Table */
.info-table{width:100%;border-collapse:collapse;margin:20px 0}
.info-table th,.info-table td{padding:12px 16px;text-align:left;border-bottom:1px solid rgba(192,200,212,0.08);font-size:.9rem}
.info-table th{color:#FF4D00;font-weight:700;width:30%}
.info-table td{color:#c0c8d4}

/* Footer */
.site-footer{background:#060e1a;border-top:1px solid rgba(255,77,0,0.15);padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{font-size:1rem;font-weight:700;color:#fff;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid #FF4D00;display:inline-block}
.footer-col a{display:block;color:#8892a4;font-size:.88rem;padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#FF4D00}
.footer-col p{font-size:.85rem;color:#8892a4;line-height:1.7}
.footer-qr{display:flex;gap:20px;margin-top:12px}
.qr-item{text-align:center}
.qr-item img{width:100px;height:100px;border-radius:8px;border:2px solid rgba(255,77,0,0.2)}
.qr-item span{display:block;font-size:.75rem;color:#6b7a8d;margin-top:6px}
.footer-bottom{text-align:center;padding:20px 0;border-top:1px solid rgba(192,200,212,0.06);font-size:.82rem;color:#556}
.update-time{color:#6b7a8d;margin-top:6px}

/* Page Banner */
.page-banner{background:linear-gradient(135deg,#0A1628,#162a4a);padding:50px 0 40px;text-align:center}
.page-banner h1{font-size:2rem;font-weight:800;color:#FF4D00;margin-bottom:8px}
.page-banner p{color:#8892a4;font-size:1rem}
.banner-text{max-width:700px;margin:0 auto}
.content-section{padding:40px 0}

/* Utility */
.text-center{text-align:center}
.text-highlight{color:#FF4D00}
.text-gold{color:#FFB800}
.mb-20{margin-bottom:20px}
.mb-40{margin-bottom:40px}
.mt-20{margin-top:20px}
.mt-40{margin-top:40px}

/* H tags */
h1{font-size:2.2rem;font-weight:900;color:#FF4D00}
h2{font-size:1.8rem;font-weight:800;color:#fff}
h3{font-size:1.3rem;font-weight:700;color:#e0e6ed}
h4{font-size:1.1rem;font-weight:700;color:#fff}
h5{font-size:1rem;font-weight:600;color:#c0c8d4}
h6{font-size:.9rem;font-weight:600;color:#8892a4}

/* Lazy load */
.lazy-img{opacity:0;transition:opacity .5s}
.lazy-img.loaded{opacity:1}

/* Fade in animation */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s,transform .6s}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* Disturb tags - hidden but present */
.disturb-wrap{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;padding:0;margin:-1px}

/* Responsive */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.open{display:flex}
  .menu-toggle{display:block}
  .hero-content h1{font-size:1.8rem}
  .hero-section{min-height:380px}
  .section-title{font-size:1.4rem}
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .search-bar{margin:0 20px}
  .contact-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .hero-content p{font-size:.95rem}
  .section-padding{padding:40px 0}
  body{font-size:15px}
}