:root {
  --bg: #0a0c12;
  --panel: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.14);
  --text: #f2efe6;
  --muted: #aab0c0;
  --accent: #c8a24a;     /* roman gold */
  --accent2: #b5472d;    /* roman red */
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background:
    radial-gradient(1100px 700px at 12% -8%, #1b1d28 0%, transparent 55%),
    radial-gradient(900px 600px at 112% 118%, #241712 0%, transparent 52%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

#app.loading { position: fixed; inset: 0; display: grid; place-items: center; color: var(--muted); }

#deck { position: fixed; inset: 0; display: flex; flex-direction: column; }

/* ---------- Stage (image) ---------- */
#stage {
  flex: 1;
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: clamp(0.5rem, 2vw, 1.5rem);
}
#stage img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
  background: #fff;
  animation: fade 0.35s ease;
}
@keyframes fade { from { opacity: 0; transform: scale(0.992); } to { opacity: 1; transform: none; } }

#stage::after { /* click hint zones are invisible; cursor only */ content: none; }

/* ---------- Progress ---------- */
#progress { height: 4px; background: rgba(255, 255, 255, 0.08); }
#progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  transition: width 0.3s ease;
}

/* ---------- Controls ---------- */
#controls {
  display: flex; align-items: center; justify-content: center; gap: 0.55rem;
  padding: 0.6rem; flex-wrap: wrap;
  background: rgba(8, 9, 14, 0.7);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
}
#controls button, #controls a {
  appearance: none;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--panel); color: var(--text);
  border: 1px solid var(--border); border-radius: 11px;
  min-width: 44px; height: 42px; padding: 0 0.7rem;
  font-size: 1.15rem; line-height: 1; cursor: pointer; text-decoration: none;
  transition: background 0.15s, transform 0.1s, border-color 0.15s;
}
#btn-pdf { font-size: 0.85rem; font-weight: 600; letter-spacing: 0.02em; gap: 0.3em; }
#controls button:hover, #controls a:hover { background: rgba(200, 162, 74, 0.18); border-color: var(--accent); }
#controls button:active, #controls a:active { transform: scale(0.94); }
#counter { min-width: 80px; text-align: center; color: var(--muted); font-variant-numeric: tabular-nums; font-size: 0.95rem; }
#cur { color: var(--text); font-weight: 700; }

/* ---------- Overview ---------- */
#overview {
  position: fixed; inset: 0; z-index: 20;
  background: rgba(6, 7, 12, 0.97);
  backdrop-filter: blur(6px);
  display: flex; flex-direction: column;
}
#overview-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--border);
}
#overview-head strong { font-weight: 600; }
#ov-title { color: var(--accent); }
#ov-close {
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; width: 40px; height: 38px; font-size: 1rem; cursor: pointer;
}
#ov-close:hover { border-color: var(--accent); }
#overview-grid {
  flex: 1; overflow-y: auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.8rem; padding: clamp(1rem, 4vw, 2.5rem);
  align-content: start;
}
.ov-item {
  text-align: left; background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 0; overflow: hidden; cursor: pointer;
  color: var(--text); font: inherit;
  transition: border-color 0.15s, transform 0.1s;
}
.ov-item:hover { border-color: var(--accent); transform: translateY(-2px); }
.ov-item img { display: block; width: 100%; aspect-ratio: 16/9; object-fit: cover; background: #fff; }
.ov-item .cap { display: block; padding: 0.5rem 0.6rem; font-size: 0.78rem; line-height: 1.3; color: var(--muted); }
.ov-item .cap b { color: var(--text); }

/* ---------- Hint ---------- */
#hint {
  position: fixed; left: 50%; bottom: 74px; transform: translateX(-50%);
  color: var(--muted); font-size: 0.82rem;
  background: rgba(8, 9, 14, 0.75); padding: 0.4rem 0.9rem;
  border-radius: 999px; border: 1px solid var(--border);
  transition: opacity 0.6s ease; pointer-events: none;
}

@media (max-width: 640px) {
  #controls button, #controls a { height: 40px; min-width: 42px; }
  #btn-pdf span.lbl { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  #stage img { animation: none; }
}