/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:#f4f5f7;color:#18191c;line-height:1.6;min-height:100vh}
a{text-decoration:none;color:inherit}

/* === Top Nav === */
.top-nav{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.06);height:60px}
.nav-inner{max-width:1400px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:8px;flex-shrink:0}
.logo-text{font-size:18px;font-weight:700;color:#18191c;letter-spacing:.5px}
.logo-text::after{content:"·视频";color:#FB7299;font-weight:400}
.search-box{flex:1;max-width:480px;display:flex;align-items:center;background:#f1f2f3;border-radius:8px;border:1px solid transparent;transition:all .2s}
.search-box:focus-within{background:#fff;border-color:#FB7299}
.search-box input{flex:1;border:none;background:none;padding:8px 12px;font-size:14px;outline:none}
.search-btn{background:none;border:none;padding:8px 12px;cursor:pointer;display:flex;align-items:center}
.nav-actions{display:flex;gap:8px;margin-left:auto}
.nav-link{padding:6px 16px;border-radius:6px;font-size:14px;color:#666;transition:all .2s}
.nav-link:hover,.nav-link.active{color:#FB7299;background:#FFF0F3}

/* === Main Layout === */
.main-layout{max-width:1400px;margin:0 auto;padding:16px 24px;display:flex;gap:16px}

/* === Sidebar === */
.sidebar{width:200px;flex-shrink:0;position:sticky;top:76px;align-self:flex-start}
.sidebar-section{margin-bottom:20px}
.sidebar-title{font-size:12px;color:#999;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;padding-left:12px}
.sidebar-menu{list-style:none}
.sidebar-item{padding:10px 12px;border-radius:8px;font-size:14px;color:#61666D;cursor:pointer;transition:all .15s;display:flex;align-items:center;gap:8px}
.sidebar-item:hover{background:#e8e8ea;color:#18191c}
.sidebar-item.active{background:#FFF0F3;color:#FB7299;font-weight:600}
/* Category icon dots */
.sidebar-item::before{content:'';width:6px;height:6px;border-radius:50%;background:#ccc;flex-shrink:0}
.sidebar-item.active::before{background:#FB7299}

/* === Content === */
.content{flex:1;min-width:0}

/* === Banner === */
.banner{background:linear-gradient(135deg,#FB7299 0%,#ff85a8 50%,#ff9bb6 100%);border-radius:12px;padding:28px 32px;margin-bottom:16px;color:#fff}
.banner h1{font-size:22px;font-weight:700;margin-bottom:6px}
.banner p{font-size:14px;opacity:.9}

/* === Stats Bar === */
.stats-bar{display:flex;gap:24px;padding:0 0 16px;font-size:13px;color:#999}
.stats-bar strong{color:#18191c;font-weight:600}

/* === Video Grid === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;cursor:pointer;transition:transform .2s,box-shadow .2s}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.video-card .card-cover{position:relative;aspect-ratio:16/9;background:#e8e8ea;overflow:hidden}
.video-card .card-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.video-card:hover .card-cover img{transform:scale(1.05)}
.video-card .card-cover .placeholder-img{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#2b2d42,#8d99ae)}
.video-card .card-cover .placeholder-img svg{opacity:.6}
.video-card .duration-badge{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;font-size:12px;padding:2px 6px;border-radius:4px;font-weight:500}
.video-card .play-badge{position:absolute;top:8px;right:8px;display:flex;align-items:center;gap:4px;background:rgba(0,0,0,.6);color:#fff;font-size:12px;padding:2px 8px;border-radius:4px}
.video-card .card-body{padding:12px}
.video-card .card-title{font-size:14px;font-weight:600;line-height:1.4;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:#18191c}
.video-card .card-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#999}
.video-card .card-category{display:inline-block;padding:2px 8px;background:#FFF0F3;color:#FB7299;border-radius:4px;font-size:11px;margin-top:8px}

/* Category labels */
.cat-tutorial{background:#E8F4FD;color:#00A1D6}
.cat-demo{background:#F0EBFF;color:#7C5CFC}
.cat-setup{background:#FFF3E5;color:#FF8C38}
.cat-tips{background:#E5FBF0;color:#2ECC71}

/* === Empty State === */
.empty-state{grid-column:1/-1;text-align:center;padding:80px 20px;color:#999}
.empty-state svg{margin-bottom:16px}
.empty-state p{font-size:15px}

/* === Player Layout === */
.player-layout{max-width:1700px;margin:0 auto;padding:16px 24px;display:flex;gap:16px}
.player-main{flex:1;min-width:0;min-width:700px}
.player-sidebar{width:320px;flex-shrink:0}
.player-wrapper{background:#000;border-radius:12px;overflow:hidden;margin-bottom:16px}
.player-wrapper video,.player-wrapper .plyr{width:100%;aspect-ratio:16/9}
@media(min-width:1600px){
  .player-main{flex:1.5}
  .player-wrapper video,.player-wrapper .plyr{aspect-ratio:16/9;max-height:80vh}
}
/* Plyr override B站 pink */
.plyr--full-ui input[type=range]{color:#FB7299}
.plyr__control--overlaid{background:#FB7299!important}
.plyr--video .plyr__control:hover{background:#FB7299!important}
.plyr__menu__container .plyr__control[role=menuitemradio][aria-checked=true]::before{background:#FB7299!important}

.video-info{background:#fff;border-radius:12px;padding:20px}
.video-title{font-size:20px;font-weight:700;margin-bottom:10px;color:#18191c}
.video-meta{display:flex;gap:20px;font-size:13px;color:#999;margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid #f0f0f0}
.video-actions{display:flex;gap:12px;margin-bottom:16px}
.action-btn{display:flex;align-items:center;gap:6px;padding:8px 16px;border:1px solid #e8e8ea;border-radius:8px;background:#fff;font-size:13px;color:#666;cursor:pointer;transition:all .2s}
.action-btn:hover{border-color:#FB7299;color:#FB7299}
.action-btn.liked{background:#FFF0F3;border-color:#FB7299;color:#FB7299}
.action-btn.liked svg{fill:#FB7299;stroke:#FB7299}
.video-desc{font-size:14px;color:#666;line-height:1.7;white-space:pre-wrap;margin-bottom:12px}
.video-tags{display:flex;flex-wrap:wrap;gap:8px}
.video-tag{display:inline-block;padding:4px 12px;background:#f1f2f3;border-radius:20px;font-size:12px;color:#61666D}

/* === Related Videos === */
.player-sidebar h3{font-size:15px;font-weight:600;margin-bottom:12px;color:#18191c}
.related-list{display:flex;flex-direction:column;gap:12px}
.related-card{display:flex;gap:10px;background:#fff;border-radius:10px;overflow:hidden;cursor:pointer;transition:all .2s}
.related-card:hover{transform:translateX(-2px);box-shadow:0 2px 12px rgba(0,0,0,.08)}
.related-card .rc-cover{width:140px;aspect-ratio:16/9;flex-shrink:0;background:#e8e8ea;position:relative;overflow:hidden}
.related-card .rc-cover img{width:100%;height:100%;object-fit:cover}
.related-card .rc-cover .placeholder-img{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#2b2d42,#8d99ae)}
.related-card .rc-cover .duration-badge{position:absolute;bottom:4px;right:4px;background:rgba(0,0,0,.75);color:#fff;font-size:11px;padding:1px 5px;border-radius:3px}
.related-card .rc-body{flex:1;padding:8px 8px 8px 0;min-width:0}
.related-card .rc-title{font-size:13px;font-weight:600;line-height:1.4;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card .rc-meta{font-size:11px;color:#999}

/* === Back link === */
.back-link{color:#FB7299;font-size:14px;padding:6px 16px;border-radius:6px;transition:all .2s}
.back-link:hover{background:#FFF0F3}

/* === Responsive === */
@media(max-width:900px){
  .main-layout{flex-direction:column;padding:12px 16px}
  .sidebar{width:100%;position:static;display:flex;gap:8px;overflow-x:auto}
  .sidebar-section{margin-bottom:0;flex-shrink:0}
  .sidebar-menu{display:flex;gap:4px}
  .sidebar-item{white-space:nowrap;font-size:13px;padding:6px 12px}
  .sidebar-item::before{display:none}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .nav-inner{gap:12px;padding:0 16px}
  .search-box{max-width:200px}
  .logo-text{font-size:15px}
  .player-layout{flex-direction:column;padding:12px 16px}
  .player-sidebar{width:100%}
  .related-list{flex-direction:row;overflow-x:auto;gap:8px}
  .related-card{flex-direction:column;min-width:200px}
  .related-card .rc-cover{width:100%}
  .video-title{font-size:17px}
}