/* ========================================
   黑丝 - 原创样式表
   配色方案：深紫 #6C3CE1 / 樱粉 #FF6B9D / 薄荷 #00D4AA / 暗夜 #0F0B1E
   ======================================== */

/* === CSS Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;color:#e8e0f5;background:#0F0B1E;line-height:1.7;overflow-x:hidden}
a{color:#c4a8ff;text-decoration:none;transition:color .25s}
a:hover{color:#FF6B9D}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
h1,h2,h3,h4,h5,h6{line-height:1.35;font-weight:700}
em{font-style:normal;color:#FF6B9D}

/* === Container === */
.sv-container{max-width:1280px;margin:0 auto;padding:0 24px}

/* === Header === */
.sv-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,11,30,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(108,60,225,.2);transition:background .3s}
.sv-header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.sv-logo img{height:42px;width:auto}
.sv-nav ul{display:flex;gap:8px}
.sv-nav a{display:block;padding:8px 16px;border-radius:8px;font-size:15px;font-weight:500;color:#c4a8ff;transition:all .25s}
.sv-nav a:hover,.sv-nav a.active{background:rgba(108,60,225,.2);color:#fff}
.sv-header-actions{display:flex;align-items:center;gap:12px}
.sv-search-box{position:relative;display:flex;align-items:center;background:rgba(108,60,225,.15);border:1px solid rgba(108,60,225,.3);border-radius:24px;overflow:hidden;transition:border-color .3s}
.sv-search-box:focus-within{border-color:#6C3CE1}
#searchInput{background:transparent;border:none;outline:none;color:#e8e0f5;padding:8px 16px;font-size:14px;width:200px}
#searchInput::placeholder{color:rgba(196,168,255,.5)}
#searchBtn{background:none;border:none;color:#c4a8ff;cursor:pointer;padding:8px 14px;display:flex;align-items:center;transition:color .25s}
#searchBtn:hover{color:#FF6B9D}
.sv-mobile-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.sv-mobile-toggle span{display:block;width:24px;height:2px;background:#c4a8ff;border-radius:2px;transition:all .3s}

/* === Hero === */
.sv-hero{position:relative;min-height:580px;display:flex;align-items:center;overflow:hidden;margin-top:68px}
.sv-hero-bg{position:absolute;inset:0;z-index:0}
.sv-hero-bg img{width:100%;height:100%;object-fit:cover}
.sv-hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,11,30,.88) 0%,rgba(108,60,225,.45) 50%,rgba(255,107,157,.25) 100%)}
.sv-hero-content{position:relative;z-index:2;max-width:720px;padding:60px 0}
.sv-hero h1{font-size:2.4rem;margin-bottom:16px;background:linear-gradient(135deg,#fff 0%,#c4a8ff 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.sv-hero-subtitle{font-size:1.1rem;color:rgba(232,224,245,.85);margin-bottom:20px;line-height:1.8}
.sv-hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.sv-tag{display:inline-block;padding:4px 14px;background:rgba(108,60,225,.25);border:1px solid rgba(108,60,225,.4);border-radius:20px;font-size:13px;color:#c4a8ff}
.sv-hero-btns{display:flex;gap:12px;margin-bottom:32px}
.sv-btn{display:inline-block;padding:12px 28px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:all .3s;text-align:center}
.sv-btn-primary{background:linear-gradient(135deg,#6C3CE1,#FF6B9D);color:#fff;border:none}
.sv-btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(108,60,225,.4);color:#fff}
.sv-btn-outline{background:transparent;color:#c4a8ff;border:2px solid rgba(108,60,225,.5)}
.sv-btn-outline:hover{border-color:#6C3CE1;background:rgba(108,60,225,.15);color:#fff}
.sv-btn-sm{padding:8px 18px;font-size:13px;border-radius:8px}
.sv-btn-outline-sm{background:transparent;color:#c4a8ff;border:1px solid rgba(108,60,225,.4)}
.sv-btn-outline-sm:hover{border-color:#6C3CE1;color:#fff}
.sv-hero-stats{display:flex;gap:40px}
.sv-stat-item{text-align:center}
.sv-stat-item strong{display:block;font-size:1.6rem;color:#00D4AA}
.sv-stat-item span{font-size:13px;color:rgba(232,224,245,.6)}

/* === Danmaku === */
.sv-danmaku-area{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;overflow:hidden;z-index:1}
.sv-danmaku-item{position:absolute;white-space:nowrap;font-size:14px;color:rgba(255,255,255,.6);text-shadow:1px 1px 2px rgba(0,0,0,.5);animation:danmakuScroll linear forwards}
@keyframes danmakuScroll{from{transform:translateX(100vw)}to{transform:translateX(-100%)}}

/* === Sections === */
.sv-section{padding:72px 0}
.sv-section-alt{background:rgba(108,60,225,.04)}
.sv-section-header{text-align:center;margin-bottom:48px}
.sv-section-header h2{font-size:1.8rem;margin-bottom:12px;color:#fff}
.sv-section-header p{font-size:1rem;color:rgba(232,224,245,.65);max-width:680px;margin:0 auto}
.sv-breadcrumb{margin-top:12px;font-size:13px;color:rgba(232,224,245,.5)}
.sv-breadcrumb a{color:#c4a8ff}

/* === Video Grid === */
.sv-video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.sv-video-card{background:rgba(108,60,225,.08);border:1px solid rgba(108,60,225,.15);border-radius:14px;overflow:hidden;transition:all .35s}
.sv-video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(108,60,225,.2);border-color:rgba(108,60,225,.35)}
.sv-video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.sv-video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.sv-video-card:hover .sv-video-thumb img{transform:scale(1.06)}
.sv-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(108,60,225,.75);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s,transform .3s}
.sv-video-card:hover .sv-play-btn{opacity:1;transform:translate(-50%,-50%) scale(1)}
.sv-play-btn svg{margin-left:3px}
.sv-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.sv-video-info{padding:14px}
.sv-video-info h3{font-size:14px;font-weight:600;color:#e8e0f5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.sv-video-meta{display:flex;gap:12px;font-size:12px;color:rgba(232,224,245,.5);margin-bottom:8px}
.sv-video-tags{display:flex;flex-wrap:wrap;gap:6px}
.sv-video-tags span{padding:2px 8px;background:rgba(108,60,225,.15);border-radius:12px;font-size:11px;color:#c4a8ff}
.sv-more-link{text-align:center;margin-top:36px}
.sv-more-link a{color:#6C3CE1;font-weight:600;font-size:15px;transition:color .25s}
.sv-more-link a:hover{color:#FF6B9D}

/* === Feature Grid === */
.sv-feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sv-feature-card{background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.12);border-radius:16px;padding:32px 24px;transition:all .35s}
.sv-feature-card:hover{transform:translateY(-4px);border-color:rgba(108,60,225,.3);box-shadow:0 8px 28px rgba(108,60,225,.15)}
.sv-feature-icon{margin-bottom:16px}
.sv-feature-card h3{font-size:1.1rem;color:#fff;margin-bottom:10px}
.sv-feature-card p{font-size:14px;color:rgba(232,224,245,.65);line-height:1.7}

/* === Entertainment Grid === */
.sv-ent-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto;gap:20px}
.sv-ent-card{position:relative;border-radius:14px;overflow:hidden;min-height:200px}
.sv-ent-large{grid-row:1/3}
.sv-ent-img{width:100%;height:100%}
.sv-ent-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.sv-ent-card:hover .sv-ent-img img{transform:scale(1.05)}
.sv-ent-overlay{position:absolute;bottom:0;left:0;right:0;padding:24px;background:linear-gradient(transparent,rgba(15,11,30,.9))}
.sv-ent-overlay h3{font-size:1.3rem;color:#fff;margin-bottom:8px}
.sv-ent-overlay h4{font-size:1rem;color:#fff;margin-bottom:6px}
.sv-ent-overlay p{font-size:13px;color:rgba(232,224,245,.7);margin-bottom:10px}

/* === AI Grid === */
.sv-ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sv-ai-card{background:linear-gradient(145deg,rgba(108,60,225,.08),rgba(0,212,170,.04));border:1px solid rgba(108,60,225,.15);border-radius:16px;padding:36px 28px;transition:all .35s}
.sv-ai-card:hover{border-color:rgba(0,212,170,.3);box-shadow:0 8px 32px rgba(0,212,170,.1)}
.sv-ai-icon{margin-bottom:20px}
.sv-ai-card h3{font-size:1.1rem;color:#fff;margin-bottom:12px}
.sv-ai-card p{font-size:14px;color:rgba(232,224,245,.65);margin-bottom:16px}
.sv-ai-features{padding-left:18px;list-style:disc}
.sv-ai-features li{font-size:13px;color:rgba(232,224,245,.55);margin-bottom:6px}

/* === Community Grid === */
.sv-community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.sv-comm-card{background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.12);border-radius:14px;padding:28px 22px;position:relative;transition:all .3s}
.sv-comm-card:hover{border-color:rgba(255,107,157,.3);transform:translateY(-3px)}
.sv-comm-badge{position:absolute;top:14px;right:14px;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:600;background:linear-gradient(135deg,#6C3CE1,#FF6B9D);color:#fff}
.sv-comm-card h4{font-size:1.05rem;color:#fff;margin-bottom:10px}
.sv-comm-card p{font-size:14px;color:rgba(232,224,245,.6);line-height:1.7}

/* === Expert Grid === */
.sv-expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.sv-expert-card{background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.12);border-radius:16px;padding:28px 20px;text-align:center;transition:all .35s}
.sv-expert-card:hover{border-color:rgba(108,60,225,.3);transform:translateY(-4px)}
.sv-expert-avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid rgba(108,60,225,.3)}
.sv-expert-card h4{font-size:1.05rem;color:#fff;margin-bottom:4px}
.sv-expert-title{font-size:13px;color:#FF6B9D;margin-bottom:10px}
.sv-expert-desc{font-size:13px;color:rgba(232,224,245,.6);line-height:1.6;margin-bottom:12px}
.sv-expert-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin-bottom:14px}
.sv-expert-tags span{padding:3px 10px;background:rgba(0,212,170,.1);border:1px solid rgba(0,212,170,.2);border-radius:12px;font-size:11px;color:#00D4AA}
.sv-expert-actions{display:flex;justify-content:center;gap:8px}

/* === Partner Wall === */
.sv-partner-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.sv-partner-item{background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.1);border-radius:12px;padding:24px;text-align:center;transition:all .3s}
.sv-partner-item:hover{border-color:rgba(108,60,225,.3)}
.sv-partner-item span{font-size:15px;font-weight:600;color:rgba(232,224,245,.7)}

/* === Steps === */
.sv-steps{display:flex;align-items:flex-start;justify-content:center;gap:16px}
.sv-step{flex:1;max-width:300px;text-align:center;padding:28px 20px;background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.12);border-radius:16px}
.sv-step-num{width:48px;height:48px;line-height:48px;border-radius:50%;background:linear-gradient(135deg,#6C3CE1,#FF6B9D);color:#fff;font-size:1.2rem;font-weight:700;margin:0 auto 14px;text-align:center}
.sv-step h4{font-size:1rem;color:#fff;margin-bottom:8px}
.sv-step p{font-size:13px;color:rgba(232,224,245,.6)}
.sv-step-arrow{font-size:1.5rem;color:rgba(108,60,225,.4);padding-top:48px}

/* === FAQ === */
.sv-faq-list{max-width:800px;margin:0 auto}
.sv-faq-item{border:1px solid rgba(108,60,225,.12);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:border-color .3s}
.sv-faq-item:hover{border-color:rgba(108,60,225,.3)}
.sv-faq-q{display:flex;justify-content:space-between;align-items:center;padding:18px 22px;cursor:pointer;transition:background .25s}
.sv-faq-q:hover{background:rgba(108,60,225,.06)}
.sv-faq-q h3{font-size:15px;font-weight:600;color:#e8e0f5}
.sv-faq-toggle{font-size:1.4rem;color:#6C3CE1;transition:transform .3s;font-weight:300}
.sv-faq-item.open .sv-faq-toggle{transform:rotate(45deg)}
.sv-faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}
.sv-faq-item.open .sv-faq-a{max-height:300px;padding:0 22px 18px}
.sv-faq-a p{font-size:14px;color:rgba(232,224,245,.65);line-height:1.8}

/* === Reviews === */
.sv-review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.sv-review-card{background:rgba(108,60,225,.06);border:1px solid rgba(108,60,225,.1);border-radius:14px;padding:24px;transition:all .3s}
.sv-review-card:hover{border-color:rgba(255,107,157,.25)}
.sv-review-stars{color:#FFD700;font-size:16px;margin-bottom:12px;letter-spacing:2px}
.sv-review-text{font-size:14px;color:rgba(232,224,245,.7);line-height:1.7;margin-bottom:14px;font-style:italic}
.sv-review-author strong{display:block;font-size:14px;color:#e8e0f5}
.sv-review-author span{font-size:12px;color:rgba(232,224,245,.45)}

/* === Contact === */
.sv-contact-grid{display:grid;grid-template-columns:1fr auto;gap:48px;align-items:start}
.sv-contact-info h3{font-size:1.3rem;color:#fff;margin-bottom:20px}
.sv-contact-item{margin-bottom:18px}
.sv-contact-item h5{font-size:14px;color:#FF6B9D;margin-bottom:6px}
.sv-contact-item p,.sv-contact-item li{font-size:14px;color:rgba(232,224,245,.65);line-height:1.7}
.sv-contact-item ul{padding:0}
.sv-contact-item li{margin-bottom:4px}
.sv-contact-qrcodes{display:flex;gap:24px}
.sv-qrcode-item{text-align:center}
.sv-qrcode-item img{width:160px;height:160px;border-radius:12px;border:2px solid rgba(108,60,225,.2);margin-bottom:8px}
.sv-qrcode-item p{font-size:13px;color:rgba(232,224,245,.55)}

/* === Share === */
.sv-share-section{text-align:center;padding:40px 0}
.sv-share-section h3{font-size:1.2rem;color:#fff;margin-bottom:20px}
.sv-share-btns{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.sv-share-btn{display:inline-block;padding:10px 22px;border-radius:24px;font-size:14px;font-weight:500;color:#fff;transition:all .3s}
.sv-share-wechat{background:#07C160}
.sv-share-weibo{background:#E6162D}
.sv-share-douyin{background:#161823}
.sv-share-bilibili{background:#00A1D6}
.sv-share-qq{background:#12B7F5}
.sv-share-btn:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,.3);color:#fff}

/* === Footer === */
.sv-footer{background:rgba(8,5,18,.95);border-top:1px solid rgba(108,60,225,.15);padding:48px 0 0}
.sv-footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;padding-bottom:36px}
.sv-footer-brand img{height:36px;width:auto;margin-bottom:12px}
.sv-footer-brand p{font-size:13px;color:rgba(232,224,245,.5);line-height:1.7}
.sv-footer-links h5,.sv-footer-contact h5{font-size:15px;color:#e8e0f5;margin-bottom:14px}
.sv-footer-links a{display:block;font-size:13px;color:rgba(232,224,245,.5);padding:3px 0;transition:color .25s}
.sv-footer-links a:hover{color:#FF6B9D}
.sv-footer-contact li{font-size:13px;color:rgba(232,224,245,.5);margin-bottom:4px}
.sv-footer-qrcodes{display:flex;gap:10px;margin-top:12px}
.sv-footer-qrcodes img{width:64px;height:64px;border-radius:8px;border:1px solid rgba(108,60,225,.15)}
.sv-footer-bottom{border-top:1px solid rgba(108,60,225,.1);padding:20px 0;text-align:center}
.sv-footer-bottom p{font-size:13px;color:rgba(232,224,245,.4);margin-bottom:4px}
.sv-footer-bottom a{color:rgba(196,168,255,.5)}
.sv-footer-bottom a:hover{color:#FF6B9D}

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

/* === Responsive === */
@media(max-width:1024px){
    .sv-video-grid{grid-template-columns:repeat(3,1fr)}
    .sv-feature-grid,.sv-ai-grid,.sv-community-grid,.sv-review-grid{grid-template-columns:repeat(2,1fr)}
    .sv-expert-grid{grid-template-columns:repeat(2,1fr)}
    .sv-partner-wall{grid-template-columns:repeat(3,1fr)}
    .sv-footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
    .sv-nav{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(15,11,30,.98);padding:16px;border-bottom:1px solid rgba(108,60,225,.2)}
    .sv-nav.open{display:block}
    .sv-nav ul{flex-direction:column;gap:4px}
    .sv-mobile-toggle{display:flex}
    .sv-hero{min-height:auto;padding:0}
    .sv-hero-content{padding:40px 0}
    .sv-hero h1{font-size:1.6rem}
    .sv-hero-stats{gap:20px}
    .sv-stat-item strong{font-size:1.2rem}
    .sv-video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
    .sv-feature-grid,.sv-ai-grid,.sv-community-grid,.sv-review-grid{grid-template-columns:1fr}
    .sv-expert-grid{grid-template-columns:1fr}
    .sv-ent-grid{grid-template-columns:1fr}
    .sv-ent-large{grid-row:auto}
    .sv-partner-wall{grid-template-columns:repeat(2,1fr)}
    .sv-steps{flex-direction:column;align-items:center}
    .sv-step-arrow{transform:rotate(90deg);padding:0}
    .sv-contact-grid{grid-template-columns:1fr}
    .sv-contact-qrcodes{justify-content:center}
    .sv-footer-grid{grid-template-columns:1fr}
    .sv-section{padding:48px 0}
    #searchInput{width:140px}
    .sv-hero-btns{flex-direction:column;gap:10px}
}
@media(max-width:480px){
    .sv-video-grid{grid-template-columns:1fr}
    .sv-hero h1{font-size:1.3rem}
    .sv-section-header h2{font-size:1.4rem}
    .sv-hero-stats{flex-direction:column;gap:12px}
    .sv-search-box{display:none}
}