/**
 * 蜜芽 - 国内领先修车改装视频社区平台
 * 外部CSS样式文件
 * Domain: jjpwpwj.cn
 * Version: 1.0
 * 配色：赛车红 #E63946 / 机械蓝 #1D3557 / 琥珀橙 #F4A261 / 碳纤维黑 #0D1117
 */

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#2B2D42;background:#F8F9FA;line-height:1.7;overflow-x:hidden}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#F4A261}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:#1D3557}

/* ===== Layout ===== */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-block{padding:60px 0}
.section-block:nth-child(even){background:#fff}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#E63946,#F4A261);margin:12px auto 0;border-radius:2px}
.section-title p{color:#8D99AE;font-size:1rem;max-width:600px;margin:0 auto}

/* ===== Header ===== */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,17,23,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(230,57,70,.3);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo-area{display:flex;align-items:center;gap:10px}
.logo-area img{width:40px;height:40px;border-radius:8px}
.logo-area h1{font-size:1.25rem;color:#fff;white-space:nowrap}
.logo-area h1 span{display:block;font-size:.7rem;color:#8D99AE;font-weight:400}
.main-nav{display:flex;gap:24px;align-items:center}
.main-nav a{color:#ccc;font-size:.9rem;padding:6px 0;position:relative;transition:color .3s}
.main-nav a:hover,.main-nav a.active{color:#E63946}
.main-nav a.active::after{content:'';position:absolute;bottom:0;left:0;width:100%;height:2px;background:#E63946;border-radius:1px}

/* Search Box */
.header-search{position:relative;margin-left:16px}
.header-search input{width:180px;height:34px;border:1px solid rgba(255,255,255,.2);border-radius:17px;background:rgba(255,255,255,.08);color:#fff;padding:0 36px 0 14px;font-size:.85rem;transition:all .3s;outline:none}
.header-search input:focus{border-color:#E63946;width:220px;background:rgba(255,255,255,.12)}
.header-search input::placeholder{color:#8D99AE}
.header-search-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;color:#8D99AE;cursor:pointer;font-size:1rem}
.search-tip-popup{display:none;position:absolute;top:42px;right:0;background:#1D3557;color:#fff;padding:12px 16px;border-radius:8px;font-size:.8rem;white-space:nowrap;box-shadow:0 4px 20px rgba(0,0,0,.3)}

/* Hamburger */
.hamburger-btn{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;background:none;border:none}
.hamburger-btn span{display:block;width:24px;height:2px;background:#fff;border-radius:1px;transition:all .3s}
.mobile-menu{display:none;position:fixed;top:64px;left:0;width:100%;background:#0D1117;padding:20px;border-top:1px solid rgba(230,57,70,.3)}
.mobile-menu.show{display:block}
.mobile-menu a{display:block;color:#ccc;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06);font-size:1rem}
.mobile-menu a:hover{color:#E63946}

/* ===== Hero Banner ===== */
.hero-section{position:relative;min-height:600px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:64px;background:#0D1117}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,17,23,.8),rgba(29,53,87,.6))}
.hero-content{position:relative;z-index:2;text-align:center;padding:40px 20px;max-width:800px}
.hero-content h1{font-size:3rem;color:#fff;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 em{font-style:normal;color:#E63946}
.hero-content p{font-size:1.15rem;color:rgba(255,255,255,.85);margin-bottom:30px;line-height:1.8}
.hero-stats{display:flex;justify-content:center;gap:40px;flex-wrap:wrap}
.hero-stat{text-align:center}
.hero-stat .num{font-size:2.2rem;font-weight:800;color:#F4A261;display:block}
.hero-stat .label{font-size:.85rem;color:rgba(255,255,255,.7)}
.hero-cta{display:inline-block;margin-top:24px;padding:14px 36px;background:linear-gradient(135deg,#E63946,#c62828);color:#fff;border-radius:30px;font-size:1.05rem;font-weight:600;transition:all .3s;box-shadow:0 4px 20px rgba(230,57,70,.4)}
.hero-cta:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(230,57,70,.5);color:#fff}

/* ===== Video Cards Grid ===== */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s;cursor:pointer}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1D3557}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;pointer-events:none}
.play-btn::after{content:'';display:block;width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-info{padding:16px}
.video-info h3{font-size:1rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.video-meta{display:flex;align-items:center;gap:12px;color:#8D99AE;font-size:.8rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:2px 8px;background:rgba(230,57,70,.1);color:#E63946;border-radius:4px;font-size:.72rem;margin-top:8px}

/* ===== Short Video Section (TikTok style) ===== */
.short-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.short-card{position:relative;border-radius:12px;overflow:hidden;padding-top:160%;background:#0D1117;cursor:pointer}
.short-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.short-card:hover img{transform:scale(1.05)}
.short-card-overlay{position:absolute;bottom:0;left:0;right:0;padding:16px;background:linear-gradient(transparent,rgba(0,0,0,.8));color:#fff;z-index:2}
.short-card-overlay h4{font-size:.9rem;margin-bottom:6px}
.short-card-overlay .short-stats{font-size:.75rem;color:rgba(255,255,255,.7);display:flex;gap:10px}
.short-play-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:48px;height:48px;background:rgba(255,255,255,.2);backdrop-filter:blur(4px);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;z-index:3}
.short-play-icon::after{content:'';width:0;height:0;border-left:16px solid #fff;border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:3px}
.short-card:hover .short-play-icon{opacity:1}

/* ===== AI Feature Section ===== */
.ai-section{background:linear-gradient(135deg,#0D1117,#1D3557);color:#fff}
.ai-section .section-title h2{color:#fff}
.ai-section .section-title p{color:rgba(255,255,255,.6)}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.ai-features{display:grid;gap:20px}
.ai-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:24px;transition:all .3s}
.ai-card:hover{background:rgba(230,57,70,.1);border-color:rgba(230,57,70,.3)}
.ai-card h4{color:#F4A261;margin-bottom:8px;font-size:1.05rem}
.ai-card p{color:rgba(255,255,255,.7);font-size:.9rem}
.ai-image{border-radius:12px;overflow:hidden;box-shadow:0 8px 40px rgba(0,0,0,.3)}

/* ===== Community Section ===== */
.community-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:30px;flex-wrap:wrap}
.community-tab{padding:8px 20px;border:2px solid #e0e0e0;border-radius:20px;cursor:pointer;font-size:.9rem;transition:all .3s;background:#fff}
.community-tab.active,.community-tab:hover{border-color:#E63946;color:#E63946;background:rgba(230,57,70,.05)}
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.community-card{background:#fff;border-radius:12px;padding:20px;border:1px solid #eee;transition:all .3s}
.community-card:hover{border-color:#E63946;box-shadow:0 4px 20px rgba(230,57,70,.1)}
.community-card h4{margin-bottom:8px;font-size:1rem}
.community-card p{color:#8D99AE;font-size:.88rem;margin-bottom:12px}
.community-card .card-footer{display:flex;justify-content:space-between;align-items:center;color:#8D99AE;font-size:.8rem}

/* ===== Expert Section ===== */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.expert-avatar{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:24px auto 16px;border:3px solid #E63946}
.expert-card h4{font-size:1.05rem;margin-bottom:4px}
.expert-card .expert-role{color:#E63946;font-size:.85rem;margin-bottom:12px}
.expert-card p{padding:0 16px;color:#8D99AE;font-size:.85rem;margin-bottom:16px;line-height:1.5}
.expert-actions{padding:0 16px 20px;display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid #E63946;color:#E63946;transition:all .3s;display:inline-block}
.btn-sm:hover{background:#E63946;color:#fff}

/* ===== Brand Partners ===== */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{width:120px;height:60px;background:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,0,0,.06);padding:10px;font-weight:700;color:#1D3557;font-size:.9rem;border:1px solid #eee;transition:all .3s}
.brand-wall .brand-item:hover{border-color:#E63946;box-shadow:0 4px 16px rgba(230,57,70,.15)}

/* ===== How-To Steps ===== */
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step-card{text-align:center;padding:30px 20px;background:#fff;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.06);position:relative}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,#E63946,#c62828);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:800;margin:0 auto 16px}
.step-card h4{margin-bottom:8px;font-size:1rem}
.step-card p{color:#8D99AE;font-size:.88rem}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:8px;margin-bottom:12px;border:1px solid #eee;overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:background .3s}
.faq-question:hover{background:rgba(230,57,70,.03)}
.faq-question::after{content:'+';font-size:1.4rem;color:#E63946;transition:transform .3s}
.faq-item.open .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#8D99AE;line-height:1.8}
.faq-item.open .faq-answer{padding:0 24px 18px;max-height:500px}

/* ===== Reviews ===== */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.06);border-left:4px solid #E63946}
.review-stars{color:#F4A261;margin-bottom:8px;font-size:1rem}
.review-card p{color:#555;font-size:.92rem;margin-bottom:12px;line-height:1.7;font-style:italic}
.review-author{font-weight:600;color:#1D3557;font-size:.85rem}
.review-author span{color:#8D99AE;font-weight:400}

/* ===== Contact Section ===== */
.contact-section{background:#0D1117;color:#fff}
.contact-section .section-title h2{color:#fff}
.contact-section .section-title p{color:rgba(255,255,255,.6)}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.contact-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:24px;text-align:center}
.contact-card h4{color:#F4A261;margin-bottom:12px}
.contact-card p{color:rgba(255,255,255,.7);font-size:.9rem;margin-bottom:4px}
.contact-card img{width:140px;height:140px;margin:12px auto 0;border-radius:8px}

/* ===== Share Buttons ===== */
.share-bar{display:flex;justify-content:center;gap:12px;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* ===== Footer ===== */
.site-footer{background:#0a0e14;color:#8D99AE;padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-brand p{font-size:.88rem;line-height:1.7;margin-top:12px}
.footer-links h5{color:#fff;margin-bottom:12px;font-size:.95rem}
.footer-links a{display:block;color:#8D99AE;font-size:.85rem;padding:4px 0;transition:color .3s}
.footer-links a:hover{color:#E63946}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-size:.82rem}
.footer-qrcodes{display:flex;gap:20px;align-items:center}
.footer-qrcodes img{width:80px;height:80px;border-radius:6px}
.footer-qrcodes span{font-size:.75rem;display:block;text-align:center;margin-top:4px}

/* ===== Back to Top ===== */
.back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:linear-gradient(135deg,#E63946,#c62828);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;z-index:999;border:none;box-shadow:0 4px 16px rgba(230,57,70,.4)}
.back-to-top.show{opacity:1;visibility:visible}
.back-to-top:hover{transform:translateY(-3px)}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:80px 0 16px;font-size:.85rem;color:#8D99AE}
.breadcrumb a{color:#E63946}
.breadcrumb span{margin:0 6px}

/* ===== Inner Page ===== */
.page-hero{background:linear-gradient(135deg,#0D1117,#1D3557);padding:100px 0 50px;text-align:center;color:#fff}
.page-hero h1{font-size:2.2rem;color:#fff;margin-bottom:10px}
.page-hero p{color:rgba(255,255,255,.7);font-size:1rem}
.page-content{padding:40px 0 60px}
.page-content h2{font-size:1.6rem;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid rgba(230,57,70,.2)}
.page-content h3{font-size:1.25rem;margin:20px 0 10px;color:#E63946}
.page-content p{margin-bottom:16px;color:#555;line-height:1.8}

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

/* ===== Responsive ===== */
@media(max-width:1024px){
    .video-grid,.community-grid{grid-template-columns:repeat(2,1fr)}
    .expert-grid,.steps-grid{grid-template-columns:repeat(2,1fr)}
    .ai-grid{grid-template-columns:1fr}
    .footer-top{grid-template-columns:1fr 1fr}
    .review-grid{grid-template-columns:repeat(2,1fr)}
    .contact-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
    .main-nav,.header-search{display:none}
    .hamburger-btn{display:flex}
    .hero-content h1{font-size:2rem}
    .hero-stats{gap:20px}
    .hero-stat .num{font-size:1.6rem}
    .video-grid{grid-template-columns:1fr}
    .short-video-grid{grid-template-columns:repeat(2,1fr)}
    .community-grid{grid-template-columns:1fr}
    .expert-grid{grid-template-columns:1fr}
    .steps-grid{grid-template-columns:1fr 1fr}
    .review-grid{grid-template-columns:1fr}
    .contact-grid{grid-template-columns:1fr}
    .footer-top{grid-template-columns:1fr}
    .footer-bottom{flex-direction:column;text-align:center}
    .section-block{padding:40px 0}
    .section-title h2{font-size:1.6rem}
    .hero-section{min-height:500px}
}
@media(max-width:480px){
    .short-video-grid{grid-template-columns:1fr}
    .steps-grid{grid-template-columns:1fr}
    .hero-content h1{font-size:1.6rem}
    .hero-content p{font-size:.95rem}
}