/* ═══════════════════════════════════════════════
   AI Video Studio — Stylesheet v3
   Multi-theme · Dark / Light / Warm / Neon
   ═══════════════════════════════════════════════ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* ─── Theme: Dark (default) ─── */
:root,
[data-theme="dark"]{
  --bg:#08080a;
  --bg-elev:#0e0e12;
  --bg-card:#121218;
  --bg-card-hi:#16161e;
  --border:rgba(255,255,255,.06);
  --border-hi:rgba(255,255,255,.12);
  --text:#ececee;
  --text-dim:rgba(255,255,255,.5);
  --text-faint:rgba(255,255,255,.22);
  --accent:#6c5ce7;
  --accent-hi:#8174f0;
  --accent-glow:rgba(108,92,231,.12);
  --accent-soft:rgba(108,92,231,.06);
  --danger:#ef5350;
  --success:#66bb6a;
}

/* ─── Theme: Light ─── */
[data-theme="light"]{
  --bg:#f8f8fa;
  --bg-elev:#ffffff;
  --bg-card:#ffffff;
  --bg-card-hi:#f0f0f4;
  --border:rgba(0,0,0,.08);
  --border-hi:rgba(0,0,0,.14);
  --text:#1a1a2e;
  --text-dim:rgba(0,0,0,.5);
  --text-faint:rgba(0,0,0,.25);
  --accent:#5b4bd1;
  --accent-hi:#7263e0;
  --accent-glow:rgba(91,75,209,.1);
  --accent-soft:rgba(91,75,209,.05);
  --danger:#e53935;
  --success:#43a047;
}

/* ─── Theme: Warm ─── */
[data-theme="warm"]{
  --bg:#faf6f0;
  --bg-elev:#f5efe6;
  --bg-card:#fffaf2;
  --bg-card-hi:#f5ede0;
  --border:rgba(139,90,43,.1);
  --border-hi:rgba(139,90,43,.2);
  --text:#3d2b1f;
  --text-dim:rgba(61,43,31,.5);
  --text-faint:rgba(61,43,31,.25);
  --accent:#c0653e;
  --accent-hi:#d4754a;
  --accent-glow:rgba(192,101,62,.1);
  --accent-soft:rgba(192,101,62,.05);
  --danger:#c0392b;
  --success:#5d8c3f;
}

/* ─── Theme: Neon ─── */
[data-theme="neon"]{
  --bg:#0a0014;
  --bg-elev:#13001f;
  --bg-card:#160028;
  --bg-card-hi:#1c0030;
  --border:rgba(255,0,255,.08);
  --border-hi:rgba(255,0,255,.18);
  --text:#f0e0ff;
  --text-dim:rgba(240,224,255,.5);
  --text-faint:rgba(240,224,255,.22);
  --accent:#00ffc8;
  --accent-hi:#33ffd4;
  --accent-glow:rgba(0,255,200,.12);
  --accent-soft:rgba(0,255,200,.05);
  --danger:#ff0066;
  --success:#00ff88;
}

/* ─── Base ─── */
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;
  -webkit-font-smoothing:antialiased;min-height:100vh;
  display:flex;flex-direction:column;overflow-x:hidden;
  transition:background .3s ease,color .3s ease;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit}

/* ─── Navbar ─── */
.navbar{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb,var(--bg) 85%,transparent);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1400px;margin:0 auto;padding:0 40px;
  height:60px;display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:600;letter-spacing:-.01em}
.nav-logo svg{color:var(--accent)}
.nav-actions{display:flex;align-items:center;gap:24px}
.nav-link{font-size:14px;color:var(--text-dim);transition:color var(--T,.3s);position:relative}
.nav-link:hover{color:var(--text)}
.nav-link::after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--accent);transition:width .3s;border-radius:1px}
.nav-link:hover::after{width:100%}
.nav-btn{
  font-size:13px;font-weight:500;padding:7px 22px;
  background:var(--accent);color:#fff;border-radius:100px;
  transition:all .3s;box-shadow:0 0 0 0 var(--accent-glow);
}
[data-theme="neon"] .nav-btn{color:#0a0014}
.nav-btn:hover{background:var(--accent-hi);box-shadow:0 0 20px var(--accent-glow);transform:translateY(-1px)}
.nav-logout{color:var(--text-faint)!important}
.nav-logout:hover{color:var(--danger)!important}

/* ─── Theme Switcher ─── */
.theme-switcher{display:flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--border);border-radius:100px}
.theme-btn{
  width:30px;height:30px;display:flex;align-items:center;justify-content:center;
  background:transparent;border:none;border-radius:50%;cursor:pointer;
  color:var(--text-faint);transition:all .25s;
}
.theme-btn:hover{color:var(--text-dim);background:var(--accent-soft)}
.theme-btn.active{color:var(--accent);background:var(--accent-glow)}
[data-theme="neon"] .theme-btn.active{color:var(--accent);filter:drop-shadow(0 0 4px var(--accent-glow))}

/* ─── Main ─── */
main{flex:1;max-width:1400px;width:100%;margin:0 auto;padding:0 40px}

/* ─── Hero ─── */
.hero{position:relative;padding:100px 0 72px;text-align:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.hero-glow{
  position:absolute;top:-40%;left:50%;transform:translateX(-50%);
  width:800px;height:500px;
  background:radial-gradient(ellipse at center,var(--accent-glow) 0%,transparent 60%);
  filter:blur(40px);
}
.hero-glow-2{top:10%;left:50%;width:500px;height:300px;background:radial-gradient(ellipse at center,var(--accent-soft) 0%,transparent 50%)}
.hero-content{position:relative;z-index:1}
.hero-tag{
  display:inline-block;font-family:"SF Mono","Fira Code",monospace;
  font-size:11px;letter-spacing:.18em;color:var(--accent-hi);
  padding:5px 14px;border:1px solid var(--accent-glow);border-radius:100px;background:var(--accent-soft);margin-bottom:24px;
}
.hero h1{
  font-size:clamp(40px,6vw,64px);font-weight:700;letter-spacing:-.03em;line-height:1.08;margin-bottom:16px;
  background:linear-gradient(180deg,var(--text) 0%,var(--text-dim) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{font-size:17px;color:var(--text-dim);margin-bottom:36px}
.hero-stats{display:inline-flex;align-items:center;gap:0;padding:16px 0}
.stat{display:flex;flex-direction:column;align-items:center;padding:0 28px}
.stat-num{font-family:"SF Mono","Fira Code",monospace;font-size:28px;font-weight:600;color:var(--text);letter-spacing:-.02em;line-height:1}
.stat-label{font-size:12px;color:var(--text-faint);letter-spacing:.05em;margin-top:6px}
.stat-divider{width:1px;height:28px;background:var(--border-hi)}

/* ─── Video Section ─── */
.video-section{padding:0 0 80px}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.section-title-wrap{display:flex;align-items:baseline;gap:12px}
.section-header h2{font-size:20px;font-weight:600;letter-spacing:-.01em}
.section-count{font-size:13px;color:var(--text-faint)}
.filter-bar{display:flex;gap:6px}
.filter-btn{padding:6px 18px;font-size:13px;color:var(--text-dim);background:transparent;border:1px solid var(--border);border-radius:100px;cursor:pointer;transition:all .3s}
.filter-btn:hover{color:var(--text);border-color:var(--border-hi)}
.filter-btn.active{color:#fff;background:var(--accent);border-color:var(--accent);box-shadow:0 0 12px var(--accent-glow)}
[data-theme="neon"] .filter-btn.active{color:#0a0014}

/* ─── Video Grid ─── */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:28px}
.video-card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;overflow:hidden;transition:all .4s cubic-bezier(.4,0,.2,1)}
.video-card:hover{border-color:var(--border-hi);background:var(--bg-card-hi);transform:translateY(-3px);box-shadow:0 12px 40px rgba(0,0,0,.15)}
[data-theme="neon"] .video-card:hover{box-shadow:0 0 24px var(--accent-glow),0 12px 40px rgba(0,0,0,.3)}
.thumb-wrap{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg-elev)}
.thumb-wrap img{width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.4,0,.2,1)}
.video-card:hover .thumb-wrap img{transform:scale(1.06)}
.thumb-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--bg-elev)}
.thumb-gradient{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,transparent 50%,rgba(0,0,0,.4) 100%);opacity:.6}
.duration-badge{position:absolute;bottom:8px;right:8px;padding:3px 8px;font-size:11px;font-weight:500;background:rgba(0,0,0,.8);color:#fff;border-radius:3px;backdrop-filter:blur(4px);font-family:"SF Mono","Fira Code",monospace}
.views-badge{position:absolute;top:8px;left:8px;display:flex;align-items:center;gap:4px;padding:3px 8px;font-size:11px;font-weight:500;background:rgba(0,0,0,.7);color:rgba(255,255,255,.8);border-radius:3px;backdrop-filter:blur(4px)}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.25)}
.video-card:hover .play-overlay{opacity:1}
.play-circle{width:52px;height:52px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 0 24px var(--accent-glow);transition:transform .3s}
[data-theme="neon"] .play-circle{color:#0a0014}
.video-card:hover .play-circle{transform:scale(1.1)}
.card-info{padding:14px 16px 16px}
.card-info h3{font-size:15px;font-weight:500;line-height:1.4;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:8px;color:var(--text)}
.card-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.card-tag{font-size:11px;padding:2px 8px;background:var(--accent-soft);color:var(--accent-hi);border-radius:100px}
.card-meta{display:flex;gap:12px;font-size:12px;color:var(--text-faint)}
.meta-date::before,.meta-size::before{content:"";display:inline-block;width:3px;height:3px;border-radius:50%;background:var(--text-faint);margin-right:6px;vertical-align:middle}

/* ─── Empty State ─── */
.empty-state{text-align:center;padding:80px 20px}
.empty-icon{margin-bottom:28px;display:flex;justify-content:center}
.empty-state h3{font-size:20px;font-weight:600;margin-bottom:8px}
.empty-state p{color:var(--text-dim);margin-bottom:28px}

/* ─── Player Page ─── */
.player-section{padding:24px 0 80px}
.player-wrap{display:grid;grid-template-columns:1fr 340px;gap:32px}
.player-main video{width:100%;aspect-ratio:16/9;background:#000;border-radius:10px;border:1px solid var(--border)}
.player-info{margin-top:24px}
.player-info h1{font-size:22px;font-weight:600;line-height:1.3;margin-bottom:12px;letter-spacing:-.01em}
.info-meta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-faint);margin-bottom:16px}
.info-meta .dot{opacity:.5}
.info-desc{padding:16px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;margin-bottom:16px;font-size:14px;color:var(--text-dim);line-height:1.7}
.info-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.tag-chip{padding:4px 12px;font-size:13px;background:var(--accent-glow);color:var(--accent-hi);border:1px solid var(--accent-glow);border-radius:100px}
.info-actions{display:flex;gap:12px}
.action-btn{display:flex;align-items:center;gap:8px;padding:8px 20px;font-size:14px;color:var(--text-dim);background:var(--bg-card);border:1px solid var(--border);border-radius:6px;cursor:pointer;transition:all .3s}
.action-btn:hover{color:var(--text);border-color:var(--border-hi);background:var(--bg-card-hi)}

/* ─── Sidebar ─── */
.player-sidebar h3{font-size:15px;font-weight:600;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.related-list{display:flex;flex-direction:column;gap:16px}
.related-item{display:flex;gap:12px;cursor:pointer;transition:opacity .3s}
.related-item:hover{opacity:.8}
.related-thumb{position:relative;width:140px;height:79px;flex-shrink:0;border-radius:4px;overflow:hidden;background:var(--bg-elev)}
.related-thumb img{width:100%;height:100%;object-fit:cover}
.thumb-placeholder-sm{width:100%;height:100%;background:var(--bg-elev)}
.duration-badge-sm{position:absolute;bottom:4px;right:4px;padding:1px 6px;font-size:11px;background:rgba(0,0,0,.75);color:#fff;border-radius:2px}
.related-info h4{font-size:14px;font-weight:500;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:4px}
.related-info span{font-size:12px;color:var(--text-faint)}

/* ─── Upload Page ─── */
.upload-section{padding:48px 0 80px}
.upload-container{max-width:680px;margin:0 auto}
.upload-container h1{font-size:26px;font-weight:600;margin-bottom:8px;letter-spacing:-.01em}
.upload-container > p{color:var(--text-dim);margin-bottom:32px}
.dropzone{border:2px dashed var(--border-hi);border-radius:10px;padding:48px 24px;text-align:center;cursor:pointer;transition:all .3s;margin-bottom:24px;background:var(--bg-elev)}
.dropzone:hover,.dropzone.dragover{border-color:var(--accent);background:var(--accent-soft)}
.dropzone-content h3{font-size:18px;font-weight:500;margin:16px 0 4px}
.dropzone-content p{font-size:14px;color:var(--text-dim)}
.link-text{color:var(--accent-hi)}
.dropzone-preview video{max-width:100%;max-height:300px;border-radius:6px;margin-bottom:16px}
.preview-info{display:flex;justify-content:center;gap:16px;font-size:14px;color:var(--text-dim);margin-bottom:12px}
.reselect-btn{font-size:13px;color:var(--text-dim);background:transparent;border:1px solid var(--border);padding:6px 16px;border-radius:6px;cursor:pointer}
.form-fields{margin-bottom:24px}
.field{margin-bottom:20px}
.field label{display:block;font-size:14px;font-weight:500;margin-bottom:6px;color:var(--text)}
.field input,.field textarea{width:100%;padding:10px 14px;font-size:14px;background:var(--bg-elev);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:inherit;transition:border .3s}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.field textarea{resize:vertical}
.upload-progress{margin-bottom:24px}
.progress-bar{height:6px;background:var(--bg-elev);border-radius:3px;overflow:hidden;margin-bottom:8px}
.progress-fill{height:100%;width:0;background:var(--accent);border-radius:3px;transition:width .3s ease;box-shadow:0 0 8px var(--accent-glow)}
#progressText{font-size:13px;color:var(--text-dim)}
.form-actions{display:flex;justify-content:flex-end;gap:12px}
.cancel-btn{padding:10px 24px;font-size:14px;color:var(--text-dim);border:1px solid var(--border);border-radius:6px;transition:all .3s}
.cancel-btn:hover{color:var(--text);border-color:var(--border-hi)}
.submit-btn{padding:10px 32px;font-size:14px;font-weight:500;background:var(--accent);color:#fff;border:none;border-radius:6px;cursor:pointer;transition:all .3s}
[data-theme="neon"] .submit-btn{color:#0a0014}
.submit-btn:hover:not(:disabled){background:var(--accent-hi);box-shadow:0 0 16px var(--accent-glow)}
.submit-btn:disabled{opacity:.4;cursor:not-allowed}

/* ─── Modal ─── */
.modal-overlay{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);display:none;align-items:center;justify-content:center}
.modal-overlay.active{display:flex}
.modal-box{background:var(--bg-elev);border:1px solid var(--border);border-radius:10px;padding:32px;max-width:440px;width:90%;text-align:center}
.modal-box h3{font-size:18px;font-weight:600;margin-bottom:8px}
.modal-box p{color:var(--text-dim);margin-bottom:20px}
.share-link-wrap{display:flex;gap:8px;margin-bottom:16px}
.share-link-wrap input{flex:1;padding:10px 14px;font-size:14px;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text)}
.share-link-wrap button{padding:0 20px;font-size:14px;font-weight:500;background:var(--accent);color:#fff;border:none;border-radius:6px;cursor:pointer}
[data-theme="neon"] .share-link-wrap button{color:#0a0014}
.modal-close{padding:8px 24px;font-size:14px;color:var(--text-dim);background:transparent;border:1px solid var(--border);border-radius:6px;cursor:pointer}
.modal-actions{display:flex;justify-content:center;gap:12px;margin-top:8px}
.modal-actions .submit-btn{background:var(--danger);padding:8px 20px}
.modal-actions .submit-btn:hover{box-shadow:0 0 12px rgba(239,83,80,.2)}

/* ─── Flash ─── */
.flash-wrap{max-width:680px;margin:16px auto 0}
.flash{padding:10px 20px;border-radius:6px;font-size:14px;margin-bottom:8px;animation:fadeInUp .3s ease}
.flash-success{background:color-mix(in srgb,var(--success) 12%,transparent);color:var(--success);border:1px solid color-mix(in srgb,var(--success) 20%,transparent)}
.flash-error{background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger);border:1px solid color-mix(in srgb,var(--danger) 20%,transparent)}

/* ─── Login ─── */
.login-section{min-height:70vh;display:flex;align-items:center;justify-content:center;padding:40px 20px}
.login-card{width:100%;max-width:400px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:40px 36px}
.login-header{text-align:center;margin-bottom:32px}
.login-header svg{margin-bottom:16px}
.login-header h1{font-size:22px;font-weight:600;margin-bottom:6px}
.login-header p{font-size:14px;color:var(--text-dim)}
.login-form .field{margin-bottom:18px}
.login-submit{width:100%;padding:12px;margin-top:8px}

/* ─── Admin ─── */
.admin-section{padding:32px 0 80px}
.admin-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.admin-header h1{font-size:22px;font-weight:600;margin-bottom:4px}
.admin-header p{font-size:13px;color:var(--text-faint)}
.admin-table-wrap{overflow-x:auto}
.admin-table{width:100%;border-collapse:collapse;font-size:14px}
.admin-table th{text-align:left;padding:10px 14px;font-size:12px;font-weight:500;color:var(--text-faint);letter-spacing:.04em;text-transform:uppercase;border-bottom:1px solid var(--border);white-space:nowrap}
.admin-table td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:middle}
.admin-table tr:hover td{background:var(--bg-card)}
.col-thumb{width:80px}
.admin-thumb{width:64px;height:36px;object-fit:cover;border-radius:3px}
.admin-thumb-placeholder{width:64px;height:36px;border-radius:3px;background:var(--bg-elev)}
.col-title a{font-weight:500;color:var(--text)}
.col-title a:hover{color:var(--accent-hi)}
.admin-tags{display:flex;gap:4px;margin-top:4px}
.col-meta{color:var(--text-dim);font-size:13px;white-space:nowrap}
.col-actions{display:flex;gap:8px;white-space:nowrap}
.admin-action-btn{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;font-size:13px;border:1px solid var(--border);border-radius:6px;cursor:pointer;background:transparent;transition:all .3s}
.edit-btn{color:var(--text-dim)}
.edit-btn:hover{color:var(--accent-hi);border-color:var(--accent-glow)}
.del-btn{color:var(--text-dim)}
.del-btn:hover{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 30%,transparent)}

/* ─── Edit Page ─── */
.edit-preview{margin-bottom:24px;padding:16px;background:var(--bg-elev);border:1px solid var(--border);border-radius:6px;display:flex;gap:16px;align-items:center}
.edit-thumb{width:120px;height:68px;object-fit:cover;border-radius:4px}
.edit-meta{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--text-dim)}

/* ─── Footer ─── */
footer{padding:32px 40px;border-top:1px solid var(--border);text-align:center}
footer p{font-size:13px;color:var(--text-faint)}

/* ─── Animations ─── */
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.video-card{animation:fadeInUp .5s ease forwards;opacity:0}
.video-card:nth-child(1){animation-delay:.05s}
.video-card:nth-child(2){animation-delay:.1s}
.video-card:nth-child(3){animation-delay:.15s}
.video-card:nth-child(4){animation-delay:.2s}
.video-card:nth-child(5){animation-delay:.25s}
.video-card:nth-child(6){animation-delay:.3s}
.video-card:nth-child(7){animation-delay:.35s}
.video-card:nth-child(8){animation-delay:.4s}
.video-card:nth-child(n+9){animation-delay:.45s}

/* ─── Responsive ─── */
@media(max-width:1024px){.player-wrap{grid-template-columns:1fr}.player-sidebar{margin-top:32px}}
@media(max-width:768px){
  .nav-inner,main{padding:0 20px}
  .hero{padding:64px 0 40px}
  .hero-stats{flex-wrap:wrap;justify-content:center}
  .stat{padding:0 16px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px}
  .card-info{padding:10px 12px}
  .card-info h3{font-size:13px}
  .filter-bar{display:none}
  .section-header{margin-bottom:24px}
  .player-wrap{gap:20px}
  .related-thumb{width:100px;height:56px}
  .play-circle{width:40px;height:40px}
  .play-circle svg{width:18px;height:18px}
  .theme-switcher{padding:2px}
  .theme-btn{width:26px;height:26px}
}