:root{
  --yt-red:#ff0000;
  --bg:#0f0f0f;
  --panel:#181818;
  --text:#0f0f0f;
  --text-light:#606060;
  --border:#e5e5e5;
  --chip-bg:#f2f2f2;
  --chip-active:#0f0f0f;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html,body{height:100%;}
body{
  font-family:"Roboto","Helvetica Neue",Arial,sans-serif;
  background:#fff;
  color:var(--text);
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;}
button{font-family:inherit;cursor:pointer;}

/* ===== Header ===== */
.yt-header{
  position:sticky;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;gap:16px;
  height:56px;padding:0 16px;
  background:#fff;border-bottom:1px solid var(--border);
}
.yt-menu-btn{background:none;border:none;font-size:18px;color:var(--text);padding:8px;border-radius:50%;}
.yt-menu-btn:hover{background:var(--chip-bg);}
.yt-logo{display:flex;align-items:center;gap:6px;font-size:1.25rem;font-weight:700;flex-shrink:0;}
.yt-logo i{color:var(--yt-red);font-size:1.4rem;}
.yt-logo span{letter-spacing:-0.5px;}

.yt-search{
  flex:1;max-width:640px;display:flex;align-items:center;margin:0 auto;
}
.yt-search input{
  flex:1;height:38px;padding:0 16px;border:1px solid #ccc;border-right:none;
  border-radius:20px 0 0 20px;font-size:.95rem;outline:none;background:#fff;
}
.yt-search input:focus{border-color:#1a73e8;}
.yt-search button{
  width:60px;height:38px;background:var(--chip-bg);border:1px solid #ccc;border-radius:0 20px 20px 0;
  display:flex;align-items:center;justify-content:center;color:var(--text);
}
.yt-search button:hover{background:#e5e5e5;}

.yt-header-right{display:flex;align-items:center;gap:6px;flex-shrink:0;}
.yt-icon-btn{
  width:40px;height:40px;border-radius:50%;border:none;background:none;
  display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--text);
}
.yt-icon-btn:hover{background:var(--chip-bg);}

/* ===== Category chips ===== */
.yt-chips{
  position:sticky;top:56px;z-index:90;background:#fff;
  display:flex;gap:10px;padding:12px 16px;overflow-x:auto;
  border-bottom:1px solid var(--border);
  scrollbar-width:none;
}
.yt-chips::-webkit-scrollbar{display:none;}
.chip{
  flex-shrink:0;padding:7px 14px;border-radius:8px;background:var(--chip-bg);
  font-size:.87rem;font-weight:500;white-space:nowrap;border:none;color:var(--text);
}
.chip:hover{background:#e5e5e5;}
.chip.active{background:var(--chip-active);color:#fff;}

/* ===== Grid ===== */
.yt-main{padding:20px 16px 60px;max-width:1800px;margin:0 auto;}
.yt-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(260px, 1fr));
  gap:24px 16px;
}
.vcard{cursor:pointer;}
.vthumb-wrap{position:relative;border-radius:12px;overflow:hidden;background:#f2f2f2;aspect-ratio:16/9;}
.vthumb-wrap img{width:100%;height:100%;object-fit:cover;}
.vduration{
  position:absolute;bottom:6px;right:6px;background:rgba(0,0,0,.8);color:#fff;
  font-size:.72rem;font-weight:600;padding:2px 5px;border-radius:3px;
}
.vcard-body{display:flex;gap:10px;margin-top:10px;}
.vavatar{
  width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#ff0000,#992222);
  flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.85rem;
}
.vinfo{min-width:0;}
.vtitle{
  font-size:.95rem;font-weight:600;line-height:1.35;color:var(--text);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.vmeta{font-size:.82rem;color:var(--text-light);margin-top:4px;}
.vmeta span{display:block;}

/* ===== Empty state ===== */
.empty-state{text-align:center;padding:80px 20px;color:var(--text-light);}
.empty-state i{font-size:2.5rem;margin-bottom:14px;color:#ccc;}

/* ===== Theater / Watch view ===== */
.watch-wrap{display:none;padding:20px 16px 60px;max-width:1800px;margin:0 auto;}
.watch-wrap.show{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap;}
.watch-main{flex:2;min-width:300px;}
.player-shell{
  width:100%;aspect-ratio:16/9;background:#000;border-radius:12px;overflow:hidden;
}
.player-shell video, .player-shell iframe{width:100%;height:100%;border:none;display:block;}
.watch-title{font-size:1.2rem;font-weight:600;margin-top:14px;}
.watch-meta{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;
  padding:10px 0;border-bottom:1px solid var(--border);margin-bottom:14px;color:var(--text-light);font-size:.88rem;
}
.watch-desc{
  background:var(--chip-bg);border-radius:12px;padding:14px;font-size:.9rem;line-height:1.5;white-space:pre-wrap;
}
.back-btn{
  display:inline-flex;align-items:center;gap:8px;font-size:.88rem;font-weight:600;
  background:var(--chip-bg);border:none;padding:8px 14px;border-radius:20px;margin-bottom:14px;
}
.back-btn:hover{background:#e5e5e5;}

.watch-side{flex:1;min-width:280px;display:flex;flex-direction:column;gap:10px;}
.side-card{display:flex;gap:8px;cursor:pointer;}
.side-thumb{width:168px;flex-shrink:0;border-radius:8px;overflow:hidden;aspect-ratio:16/9;background:#f2f2f2;position:relative;}
.side-thumb img{width:100%;height:100%;object-fit:cover;}
.side-title{font-size:.87rem;font-weight:600;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.side-meta{font-size:.78rem;color:var(--text-light);margin-top:4px;}

/* ===== Loader ===== */
.loader{display:flex;justify-content:center;padding:60px;color:var(--text-light);font-size:1.4rem;}

/* ===== Responsive ===== */
@media(max-width:768px){
  .yt-logo span{display:none;}
  .yt-search{margin:0 8px;}
  .watch-wrap.show{flex-direction:column;}
  .side-card{max-width:100%;}
}
@media(max-width:480px){
  .yt-header{gap:8px;padding:0 10px;}
  .yt-grid{grid-template-columns:repeat(auto-fill, minmax(150px,1fr));gap:16px 10px;}
  .vtitle{font-size:.85rem;}
  .vmeta{font-size:.75rem;}
}