:root {
  --bg: #0f1220;
  --bg-2: #181c34;
  --panel: #1f2545;
  --panel-2: #2a3162;
  --ink: #e9ecff;
  --ink-dim: #a4abd2;
  --accent: #ffb454;
  --accent-2: #ff7a59;
  --good: #4ad29a;
  --bad: #ff6b8a;
  --line: #2f3666;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, #25295a 0%, var(--bg) 60%) fixed;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 28px;
}
.topbar h1 {
  font-size: 22px; margin: 0; letter-spacing: 0.3px;
}
.topbar nav a { margin-left: 18px; color: var(--ink-dim); }
.topbar nav a.active, .topbar nav a:hover { color: var(--ink); }

.hero {
  background: linear-gradient(135deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 32px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}
.hero h2 { margin: 0 0 8px; font-size: 30px; }
.hero p { margin: 0; color: var(--ink-dim); font-size: 16px; }

.grid-2 {
  display: grid; grid-template-columns: 1fr 1fr; gap: 22px;
}
@media (max-width: 760px) { .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { color: var(--ink-dim); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  background: var(--accent);
  color: #1c1500;
  font-weight: 600;
  border: none; border-radius: 10px;
  cursor: pointer;
  transition: transform 0.08s, box-shadow 0.15s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 18px rgba(255,180,84,0.25); }
.btn.secondary {
  background: transparent; color: var(--ink);
  border: 1px solid var(--line);
}
.btn.secondary:hover { background: var(--bg-2); }
.btn.danger { background: var(--bad); color: #2a0010; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 160px;
  border: 2px dashed var(--line);
  border-radius: 14px;
  padding: 28px 20px;
  text-align: center;
  cursor: pointer;
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s;
}
.upload-zone:hover, .upload-zone.drag {
  border-color: var(--accent);
  background: rgba(255,180,84,0.05);
}
.upload-zone .upload-icon {
  font-size: 28px;
  line-height: 1;
  margin-bottom: 4px;
  opacity: 0.85;
}
.upload-zone strong { font-size: 15px; }
.upload-zone .hint { margin: 0; }
.upload-zone input { display: none; }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.thumb {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  aspect-ratio: 3 / 2;
  background: #000;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb .label {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 6px 8px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  font-size: 12px;
}
.thumb .dots {
  position: absolute; top: 6px; right: 6px;
  font-size: 11px;
  background: rgba(0,0,0,0.55);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 10px;
}
.thumb.selected { border-color: var(--accent); }

.controls {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 18px;
}
.controls .group {
  display: flex; align-items: center; gap: 8px;
}
.controls label {
  color: var(--ink-dim); font-size: 13px;
}
.controls select, .controls input[type="range"] {
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 14px;
}
.controls .stat { color: var(--accent); font-weight: 600; }
.controls .stat-dim { color: var(--ink-dim); }

.stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  position: relative;
  overflow: hidden;
  min-height: 480px;
}

.flash {
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 14px;
}
.flash.error { background: rgba(255,107,138,0.12); color: var(--bad); border: 1px solid rgba(255,107,138,0.3); }
.flash.ok    { background: rgba(74,210,154,0.12); color: var(--good); border: 1px solid rgba(74,210,154,0.3); }

.win-overlay {
  position: absolute; inset: 0;
  display: none;
  align-items: center; justify-content: center;
  background: rgba(15,18,32,0.85);
  z-index: 50;
}
.win-overlay.show { display: flex; }
.win-card {
  background: var(--panel-2);
  padding: 28px 36px;
  border-radius: 16px;
  text-align: center;
  border: 1px solid var(--accent);
}
.win-card h2 { margin: 0 0 8px; color: var(--accent); }
.win-card p { color: var(--ink-dim); margin: 0 0 16px; }

.kbd {
  background: var(--bg-2); border: 1px solid var(--line);
  border-bottom-width: 2px;
  padding: 1px 6px; border-radius: 4px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
}

/* slider game */
.slider-stage {
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  user-select: none;
}
.slider-board {
  position: relative;
  background: var(--bg-2);
  border-radius: 8px;
  box-shadow: inset 0 0 0 1px var(--line);
}
.slider-tile {
  position: absolute;
  background-size: cover;
  background-repeat: no-repeat;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.3);
  transition: left 0.16s ease, top 0.16s ease;
}
.slider-tile.peek { opacity: 0.35; }
.slider-tile:hover { box-shadow: inset 0 0 0 2px var(--accent); }
.slider-tile.empty { background: transparent; cursor: default; box-shadow: none; }

.hint {
  font-size: 13px;
  color: var(--ink-dim);
  margin-top: 10px;
}