/* ============================================
   草莓视频 - 汽车改装视频社区 原创样式
   配色：赛车黑 #0D0D0D / 引擎红 #E63946 / 碳灰 #2B2D30 / 银灰 #A8AAAD / 白 #F5F5F5
   ============================================ */

/* === Reset & Base === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;background:#0D0D0D;color:#E8E8E8;line-height:1.7;overflow-x:hidden}
a{color:#E63946;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B6B}
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:#FFFFFF}

/* === Container === */
.kkt-container{max-width:1280px;margin:0 auto;padding:0 20px}

/* === Header / Navigation === */
.kkt-header{background:linear-gradient(180deg,#0D0D0D 0%,rgba(13,13,13,.95) 100%);position:sticky;top:0;z-index:1000;border-bottom:2px solid #E63946;backdrop-filter:blur(10px)}
.kkt-nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0;max-width:1280px;margin:0 auto;padding-left:20px;padding-right:20px}
.kkt-nav-logo{display:flex;align-items:center;gap:10px}
.kkt-nav-logo img{height:42px;width:auto}
.kkt-nav-logo span{font-size:1.4rem;font-weight:800;color:#FFFFFF;letter-spacing:1px}
.kkt-nav-logo span em{font-style:normal;color:#E63946}
.kkt-nav-menu{display:flex;align-items:center;gap:6px}
.kkt-nav-menu a{color:#C8C8C8;font-size:.9rem;padding:8px 14px;border-radius:6px;transition:all .3s;font-weight:500}
.kkt-nav-menu a:hover,.kkt-nav-menu a.active{color:#FFFFFF;background:rgba(230,57,70,.15)}
.kkt-menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.kkt-menu-toggle span{width:24px;height:2px;background:#FFFFFF;border-radius:2px;transition:all .3s}

/* === Search Bar === */
.kkt-search-bar{background:#1A1A1E;padding:14px 0;border-bottom:1px solid #2B2D30}
.kkt-search-wrap{max-width:680px;margin:0 auto;display:flex;gap:0;padding:0 20px}
.kkt-search-wrap input{flex:1;background:#2B2D30;border:2px solid #3A3C40;border-right:none;border-radius:8px 0 0 8px;padding:10px 18px;color:#FFFFFF;font-size:.95rem;outline:none;transition:border-color .3s}
.kkt-search-wrap input:focus{border-color:#E63946}
.kkt-search-wrap input::placeholder{color:#666}
.kkt-search-wrap button{background:#E63946;color:#FFF;border:none;padding:10px 28px;border-radius:0 8px 8px 0;font-size:.95rem;cursor:pointer;font-weight:600;transition:background .3s}
.kkt-search-wrap button:hover{background:#FF4757}

/* === Hero Banner === */
.kkt-hero{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.kkt-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.kkt-hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(230,57,70,.3) 0%,rgba(13,13,13,.8) 60%)}
.kkt-hero-content{position:relative;z-index:2;text-align:center;padding:0 20px}
.kkt-hero-content h1{font-size:2.8rem;margin-bottom:12px;text-shadow:0 4px 20px rgba(0,0,0,.6)}
.kkt-hero-content h1 em{font-style:normal;color:#E63946}
.kkt-hero-content p{font-size:1.15rem;color:#C8C8C8;max-width:700px;margin:0 auto 24px}
.kkt-hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:16px}
.kkt-hero-tags span{background:rgba(230,57,70,.2);border:1px solid rgba(230,57,70,.4);color:#FF8A8A;padding:6px 16px;border-radius:20px;font-size:.85rem}
.kkt-hero-btn{display:inline-block;background:linear-gradient(135deg,#E63946,#C0392B);color:#FFF;padding:14px 36px;border-radius:8px;font-size:1.05rem;font-weight:700;margin-top:20px;transition:transform .3s,box-shadow .3s;box-shadow:0 4px 20px rgba(230,57,70,.4)}
.kkt-hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(230,57,70,.6);color:#FFF}

/* === Section Common === */
.kkt-section{padding:60px 0}
.kkt-section-dark{background:#111114}
.kkt-section-darker{background:#0D0D0D}
.kkt-section-carbon{background:linear-gradient(180deg,#151518 0%,#1A1A1E 100%)}
.kkt-section-title{text-align:center;margin-bottom:40px}
.kkt-section-title h2{font-size:2rem;margin-bottom:8px}
.kkt-section-title h2 em{font-style:normal;color:#E63946}
.kkt-section-title p{color:#888;font-size:1rem}
.kkt-section-title .kkt-line{width:60px;height:3px;background:linear-gradient(90deg,#E63946,#FF6B6B);margin:12px auto 0;border-radius:2px}

/* === Video Card Grid === */
.kkt-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.kkt-video-card{background:#1A1A1E;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid #2B2D30}
.kkt-video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(230,57,70,.2);border-color:#E63946}
.kkt-video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#000}
.kkt-video-thumb video,.kkt-video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.kkt-video-thumb .kkt-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(230,57,70,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer;z-index:3}
.kkt-video-thumb .kkt-play-btn::after{content:"";border-left:20px solid #FFF;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.kkt-video-card:hover .kkt-play-btn{opacity:1}
.kkt-video-thumb .kkt-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#FFF;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:3}
.kkt-video-info{padding:14px}
.kkt-video-info h3{font-size:.95rem;margin-bottom:6px;color:#F0F0F0;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kkt-video-meta{display:flex;align-items:center;gap:12px;color:#777;font-size:.8rem}
.kkt-video-meta span{display:flex;align-items:center;gap:4px}

/* === Module Cards (汽车传媒/娱乐/AI/社区) === */
.kkt-mod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.kkt-mod-card{background:linear-gradient(145deg,#1A1A1E,#222226);border-radius:12px;padding:28px;border:1px solid #2B2D30;transition:all .3s}
.kkt-mod-card:hover{border-color:#E63946;box-shadow:0 8px 30px rgba(230,57,70,.15)}
.kkt-mod-card .kkt-mod-icon{width:52px;height:52px;background:linear-gradient(135deg,#E63946,#C0392B);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:16px}
.kkt-mod-card h3{font-size:1.1rem;margin-bottom:8px}
.kkt-mod-card p{color:#999;font-size:.9rem;line-height:1.6}

/* === Expert Team === */
.kkt-expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.kkt-expert-card{background:#1A1A1E;border-radius:12px;overflow:hidden;text-align:center;border:1px solid #2B2D30;transition:all .3s}
.kkt-expert-card:hover{border-color:#E63946;transform:translateY(-4px)}
.kkt-expert-card img{width:100%;aspect-ratio:1;object-fit:cover}
.kkt-expert-card .kkt-expert-info{padding:16px}
.kkt-expert-card h4{font-size:1rem;margin-bottom:4px}
.kkt-expert-card .kkt-expert-role{color:#E63946;font-size:.85rem;margin-bottom:8px}
.kkt-expert-card p{color:#888;font-size:.82rem;line-height:1.5}
.kkt-expert-card .kkt-expert-btns{display:flex;gap:8px;justify-content:center;padding:0 16px 16px}
.kkt-expert-card .kkt-expert-btns a{flex:1;padding:8px 0;border-radius:6px;font-size:.8rem;text-align:center;font-weight:600}
.kkt-expert-btns .kkt-btn-primary{background:#E63946;color:#FFF}
.kkt-expert-btns .kkt-btn-outline{border:1px solid #E63946;color:#E63946}

/* === Brand Wall === */
.kkt-brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:24px;padding:20px 0}
.kkt-brand-item{background:#1A1A1E;border:1px solid #2B2D30;border-radius:10px;padding:16px 28px;font-size:.95rem;color:#A8AAAD;font-weight:600;transition:all .3s}
.kkt-brand-item:hover{border-color:#E63946;color:#E63946}

/* === FAQ === */
.kkt-faq-list{max-width:860px;margin:0 auto}
.kkt-faq-item{background:#1A1A1E;border:1px solid #2B2D30;border-radius:10px;margin-bottom:12px;overflow:hidden}
.kkt-faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#F0F0F0;transition:background .3s}
.kkt-faq-q:hover{background:#222226}
.kkt-faq-q::after{content:"+";font-size:1.4rem;color:#E63946;transition:transform .3s}
.kkt-faq-item.active .kkt-faq-q::after{transform:rotate(45deg)}
.kkt-faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#999;line-height:1.7}
.kkt-faq-item.active .kkt-faq-a{padding:0 24px 18px;max-height:300px}

/* === Reviews === */
.kkt-review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.kkt-review-card{background:#1A1A1E;border:1px solid #2B2D30;border-radius:12px;padding:24px;transition:all .3s}
.kkt-review-card:hover{border-color:#E63946}
.kkt-review-card .kkt-stars{color:#E63946;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.kkt-review-card p{color:#CCC;font-size:.92rem;line-height:1.6;margin-bottom:12px;font-style:italic}
.kkt-review-card .kkt-reviewer{display:flex;align-items:center;gap:10px;color:#888;font-size:.85rem}
.kkt-review-card .kkt-reviewer strong{color:#F0F0F0}

/* === How-To Guide === */
.kkt-howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.kkt-howto-step{background:#1A1A1E;border:1px solid #2B2D30;border-radius:12px;padding:24px;text-align:center;position:relative;counter-increment:step}
.kkt-howto-step::before{content:counter(step);display:block;width:44px;height:44px;background:linear-gradient(135deg,#E63946,#C0392B);border-radius:50%;line-height:44px;text-align:center;font-weight:800;font-size:1.2rem;color:#FFF;margin:0 auto 14px}
.kkt-howto-step h4{margin-bottom:8px;font-size:1rem}
.kkt-howto-step p{color:#888;font-size:.85rem}

/* === Contact === */
.kkt-contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;align-items:start}
.kkt-contact-info{background:#1A1A1E;border:1px solid #2B2D30;border-radius:12px;padding:30px}
.kkt-contact-info h3{margin-bottom:16px;font-size:1.2rem}
.kkt-contact-info .kkt-info-row{display:flex;gap:12px;margin-bottom:14px;color:#CCC;font-size:.92rem;align-items:flex-start}
.kkt-contact-info .kkt-info-row strong{color:#E63946;min-width:70px}
.kkt-contact-qr{display:flex;gap:24px;justify-content:center}
.kkt-contact-qr .kkt-qr-item{text-align:center}
.kkt-contact-qr .kkt-qr-item img{width:140px;height:140px;border-radius:8px;border:2px solid #2B2D30;margin-bottom:8px}
.kkt-contact-qr .kkt-qr-item span{color:#888;font-size:.85rem}

/* === Share Buttons === */
.kkt-share-bar{display:flex;justify-content:center;gap:12px;padding:20px 0}
.kkt-share-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-size:.88rem;font-weight:600;color:#FFF;transition:all .3s}
.kkt-share-btn:hover{transform:translateY(-2px);color:#FFF}
.kkt-share-wechat{background:#07C160}
.kkt-share-weibo{background:#E6162D}
.kkt-share-douyin{background:#161823}
.kkt-share-bilibili{background:#00A1D6}

/* === Breadcrumb === */
.kkt-breadcrumb{padding:14px 0;font-size:.85rem;color:#666}
.kkt-breadcrumb a{color:#A8AAAD}
.kkt-breadcrumb a:hover{color:#E63946}
.kkt-breadcrumb span{color:#555;margin:0 6px}

/* === Footer === */
.kkt-footer{background:#0A0A0C;border-top:2px solid #E63946;padding:40px 0 0}
.kkt-footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding-bottom:30px}
.kkt-footer-col h4{color:#FFFFFF;font-size:1rem;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid #E63946;display:inline-block}
.kkt-footer-col a{display:block;color:#888;font-size:.88rem;margin-bottom:8px;transition:color .3s}
.kkt-footer-col a:hover{color:#E63946}
.kkt-footer-col p{color:#888;font-size:.88rem;line-height:1.6}
.kkt-footer-bottom{border-top:1px solid #1A1A1E;padding:18px 0;text-align:center;color:#555;font-size:.82rem}
.kkt-footer-bottom a{color:#E63946}

/* === Page Header (Inner Pages) === */
.kkt-page-header{background:linear-gradient(135deg,#1A1A1E,#0D0D0D);padding:50px 0;text-align:center;border-bottom:1px solid #2B2D30}
.kkt-page-header h1{font-size:2.2rem;margin-bottom:8px}
.kkt-page-header h1 em{font-style:normal;color:#E63946}
.kkt-page-header p{color:#888;font-size:1rem}

/* === Responsive === */
@media(max-width:1024px){
.kkt-video-grid{grid-template-columns:repeat(3,1fr)}
.kkt-mod-grid{grid-template-columns:repeat(2,1fr)}
.kkt-expert-grid{grid-template-columns:repeat(2,1fr)}
.kkt-footer-grid{grid-template-columns:repeat(2,1fr)}
.kkt-howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
.kkt-nav-menu{display:none;position:absolute;top:100%;left:0;right:0;background:#0D0D0D;flex-direction:column;padding:16px;border-bottom:2px solid #E63946}
.kkt-nav-menu.active{display:flex}
.kkt-menu-toggle{display:flex}
.kkt-hero{height:400px}
.kkt-hero-content h1{font-size:1.8rem}
.kkt-video-grid{grid-template-columns:repeat(2,1fr)}
.kkt-mod-grid{grid-template-columns:1fr}
.kkt-expert-grid{grid-template-columns:repeat(2,1fr)}
.kkt-review-grid{grid-template-columns:1fr}
.kkt-contact-grid{grid-template-columns:1fr}
.kkt-footer-grid{grid-template-columns:1fr}
.kkt-howto-steps{grid-template-columns:1fr}
.kkt-section{padding:40px 0}
.kkt-share-bar{flex-wrap:wrap}
}
@media(max-width:480px){
.kkt-video-grid{grid-template-columns:1fr}
.kkt-expert-grid{grid-template-columns:1fr}
.kkt-hero{height:320px}
.kkt-hero-content h1{font-size:1.5rem}
.kkt-section-title h2{font-size:1.5rem}
}

/* === Lazy Load === */
.kkt-lazy{opacity:0;transition:opacity .5s}
.kkt-lazy.loaded{opacity:1}

/* === Animation === */
@keyframes kktFadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.kkt-animate{animation:kktFadeUp .6s ease forwards}