/* ── Shared light / dark theme ── */
[data-theme="light"] {
  --bg: #fafaf8;
  --surface: #fff;
  --surface-alt: #f5f5f2;
  --border: #e5e5e0;
  --border-hover: #ccc;
  --text: #1a1a1a;
  --text-muted: #666;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-dim: rgba(124, 58, 237, 0.08);
  --green: #16a34a;
  --green-dim: rgba(22, 163, 74, 0.08);
  --red: #dc2626;
  --red-dim: rgba(220, 38, 38, 0.08);
  --amber: #d97706;
  --amber-dim: rgba(217, 119, 6, 0.08);
  --blue: #2563eb;
  --blue-dim: rgba(37, 99, 235, 0.08);
  --drop-hover: #f5f0ff;
  --thumb-bg: #eee;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #111113;
  --surface: #1c1c1e;
  --surface-alt: #232326;
  --border: #2e2e30;
  --border-hover: #444;
  --text: #e4e4e7;
  --text-muted: #888;
  --accent: #a78bfa;
  --accent-hover: #8b5cf6;
  --accent-dim: rgba(167, 139, 250, 0.1);
  --green: #34d399;
  --green-dim: rgba(52, 211, 153, 0.1);
  --red: #f87171;
  --red-dim: rgba(248, 113, 113, 0.1);
  --amber: #fbbf24;
  --amber-dim: rgba(251, 191, 36, 0.1);
  --blue: #60a5fa;
  --blue-dim: rgba(96, 165, 250, 0.1);
  --drop-hover: rgba(124, 58, 237, 0.08);
  --thumb-bg: #2a2a2c;
  color-scheme: dark;
}

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

/* ── Base ── */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Container ── */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* ── Header ── */
header { margin-bottom: 2rem; }
header h1 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.25rem; }
header a { color: var(--text-muted); font-size: 0.85rem; text-decoration: none; }
header a:hover { color: var(--accent); }
.desc { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 2rem; }

/* ── Drop zone ── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin-bottom: 1.5rem;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: var(--drop-hover);
}
.drop-zone p { font-size: 0.9rem; color: var(--text-muted); }
.drop-zone .icon { font-size: 2rem; margin-bottom: 0.5rem; display: block; }

/* ── Buttons ── */
.btn {
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.6rem 1.25rem;
  transition: all 0.15s;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-secondary {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-secondary:hover:not(:disabled) {
  border-color: var(--border-hover);
  color: var(--text);
}

/* ── Inputs ── */
input, select, textarea {
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
}
input[type="range"] { accent-color: var(--accent); }

/* ── Theme toggle ── */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: border-color 0.15s, color 0.15s;
  padding: 0;
  line-height: 1;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* ── Utility ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}