/* Smooth scroll with a11y fallback */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){ html { scroll-behavior: auto; } }

/* Base */
:root{
  --bg:#0b0d10; --panel:#0d1116; --text:#eaf2ff; --muted:#9aa3ad;
  --accent-cyan:#00ffe1; --accent-mag:#ff00ff; --accent-ring: rgba(0,255,225,.28);
  --radius:18px; --shadow: 0 10px 40px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; color:var(--text);
  font-family:Inter, ui-sans-serif, system-ui, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 20% 10%, #10131a 0%, #090b0f 60%, #07080b 100%);
  -webkit-tap-highlight-color: transparent;
}

/* Header */
.site-header{ text-align:center; padding:34px 16px 16px }
.brand{ display:inline-flex; align-items:center; gap:10px; }
.logo-dot{ width:14px; height:14px; border-radius:50%; background:var(--accent-cyan); box-shadow:0 0 22px var(--accent-cyan) }
.site-header h1{ margin:0; letter-spacing:.08em; font-weight:900; font-size:38px; text-shadow:0 0 22px rgba(0,255,225,.32) }
.site-header p{margin:8px 0 0; color:var(--muted); font-size:15px}

/* Layout */
.wrap{ display:grid; grid-template-columns: auto 1fr; gap:18px; padding:16px; max-width:1200px; margin:0 auto; min-height:70vh; }

/* Glass helpers */
.glass{
  background: linear-gradient(to bottom, rgba(255,255,255,.06), rgba(255,255,255,.02)), var(--panel);
  border-radius:var(--radius);
  box-shadow: 0 0 0 1px rgba(255,255,255,.05), var(--shadow);
  backdrop-filter: blur(8px) saturate(1.05);
}
.glass-deep{
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.01)), #0b0f14;
}

/* Sidebar */
.sidebar{
  position:relative; width:60px; overflow:hidden; transition:width .25s ease;
  background: var(--panel); border-radius:var(--radius); box-shadow: var(--shadow);
  outline:1px solid rgba(255,255,255,.05);
}
.sidebar:hover, .sidebar:focus-within{ width:220px }
.sidebar .handle{ position:absolute; right:8px; top:8px; width:8px; height:36px; border-radius:99px;
  background:linear-gradient(180deg, rgba(255,255,255,.12), rgba(255,255,255,.02)) }
.sidebar h3{ margin:14px 14px 8px; font-size:12px; color:var(--muted); letter-spacing:.14em; text-transform:uppercase; white-space:nowrap; opacity:.9 }
.art-list{ display:flex; flex-direction:column; gap:10px; padding:10px }

/* Buttons */
.art-btn{
  display:flex; align-items:center; gap:12px; width:100%; padding:12px 14px; border:0; border-radius:14px;
  background:#0c1117; color:var(--text); cursor:pointer; font-weight:650;
  transition: transform .08s, box-shadow .16s, background .18s, color .18s; outline:1px solid rgba(255,255,255,.04);
}
.art-btn .dot{ width:10px; height:10px; border-radius:50%; background:var(--accent-cyan); box-shadow:0 0 14px var(--accent-cyan) }
.art-btn:hover, .art-btn:focus-visible{
  background:#0f1621;
  box-shadow:0 0 0 1px rgba(255,255,255,.06), 0 0 24px rgba(0,255,225,.18), 0 0 24px rgba(255,0,255,.10);
  transform: translateY(-1px);
}

/* Content */
.content{ padding:16px; display:flex; flex-direction:column; min-height:68vh }

/* Centered, sticky, scrollable tabs with cyan→magenta accent */
.tabs{
  position:sticky; top:0; z-index:5; margin:0 auto 16px; width:100%;
  background:linear-gradient(to bottom, rgba(255,255,255,.06), rgba(255,255,255,.02));
  border-radius:999px; box-shadow:0 0 0 1px rgba(255,255,255,.05), 0 6px 28px rgba(0,0,0,.35);
  backdrop-filter: blur(8px) saturate(1.05);
}
.tabs-track{
  display:flex; gap:10px; align-items:center; justify-content:center;
  overflow-x:auto; scrollbar-width:none; -ms-overflow-style:none;
  padding:8px 12px; border-radius:999px; -webkit-overflow-scrolling: touch; scroll-snap-type:x proximity;
}
.tabs-track::-webkit-scrollbar{ display:none; }
.tab{
  scroll-snap-align:center;
  padding:10px 16px; border-radius:999px; border:0; cursor:pointer;
  background:transparent; color:var(--muted); font-weight:800; letter-spacing:.02em; outline:none;
  transition: color .2s, transform .08s, box-shadow .2s, background .2s;
}
.tab[aria-selected="true"]{
  color:#081116;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-mag));
  box-shadow:0 0 0 1px rgba(255,255,255,.25) inset, 0 0 26px rgba(0,255,225,.35), 0 0 26px rgba(255,0,255,.25);
  text-shadow:0 0 16px rgba(0,0,0,.25);
}
.tab:hover,.tab:focus-visible{ transform: translateY(-1px); box-shadow:0 0 0 2px var(--accent-ring), 0 0 28px rgba(255,0,255,.12) }
.tab-link{ text-decoration:none; color:var(--text); background:transparent; border:1px solid rgba(255,255,255,.12) }
.tab-link:hover,.tab-link:focus-visible{ background:#0f1621; box-shadow:0 0 0 2px var(--accent-ring), 0 0 28px rgba(255,0,255,.12) }

/* Viewer */
.viewer{
  position:relative; flex:1; display:grid; place-items:center; border-radius:16px; overflow:hidden;
  background: radial-gradient(60% 65% at 50% 45%, rgba(0,255,225,.08) 0%, rgba(0,0,0,0) 60%), #0a0f14;
  min-height:430px; outline:1px solid rgba(255,255,255,.05); box-shadow: var(--shadow);
}
.viewer img{ max-width:100%; max-height:100%; display:block; filter: drop-shadow(0 0 26px rgba(0,255,225,.25)); border-radius:12px }
.caption{
  position:absolute; bottom:14px; left:14px; padding:8px 12px; border-radius:12px;
  background:rgba(0,0,0,.45); backdrop-filter:saturate(1.4) blur(8px); outline:1px solid rgba(255,255,255,.06); font-size:14px;
}

/* Responsive */
@media (max-width:900px){
  .wrap{ grid-template-columns: 1fr }
  .content{ order:1 }
  .sidebar{ order:2; width:100% }
  .art-list{ flex-direction:row; flex-wrap:wrap }
}
@media (prefers-reduced-motion:reduce){ *{transition:none !important; animation:none !important} }