:root {
  --bg: #f7f7fb;
  --fg: #14151a;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --card: #ffffff;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --primary: #3b82f6;
    --card: #151a21;
    --border: #232832;
    --shadow: 0 4px 12px rgba(0,0,0,0.4);
  }
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  margin: 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.site-header {
  padding: var(--space-6) 0 var(--space-4);
  background: transparent;
}

.site-header h1 {
  margin: 0 0 var(--space-2) 0;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.subtitle { color: var(--muted); margin: 0; }

main.container { padding-bottom: var(--space-6); }

.controls {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
  align-items: end;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
}

.control-group { grid-column: span 4; }
.control-group.inline { grid-column: span 3; align-self: center; }
.actions { grid-column: span 5; display: flex; gap: var(--space-3); justify-content: flex-end; }

@media (max-width: 800px) {
  .control-group { grid-column: span 12; }
  .control-group.inline { grid-column: span 12; }
  .actions { grid-column: span 12; justify-content: stretch; }
  .actions .btn { flex: 1; }
}

.control-group label { display: block; font-weight: 600; margin-bottom: var(--space-2); }
.control-inputs { display: flex; gap: var(--space-3); align-items: center; }

input[type="number"],
input[type="range"],
select {
  width: 100%;
}

input[type="number"],
select {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}

input[type="number"]:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent);
}

input[type="range"] { accent-color: var(--primary); }

.btn {
  appearance: none;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .06s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}

.btn:hover { box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: color-mix(in srgb, var(--primary) 70%, #0000);
}

.status {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-5) 0;
  color: var(--muted);
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}

.status .spinner { visibility: hidden; }
.status.loading .spinner { visibility: visible; }

@keyframes spin { to { transform: rotate(360deg); } }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.isomer {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  aspect-ratio: 1 / 1;
  position: relative;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.isomer-header {
  position: absolute;
  top: 8px;
  left: 10px;
  padding: 2px 8px;
  font-size: 12px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.isomer-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 90%, transparent);
}

.icon-btn:hover { border-color: var(--primary); }

.isomer canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-5);
}

.site-footer { color: var(--muted); padding: var(--space-6) 0; }

/* Footer layout and link styles */
.site-footer .footer-inner {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}
.site-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}
.site-footer a:hover { text-decoration: underline; }
.site-footer .credits { color: var(--muted); }

@media (max-width: 700px) {
  .site-footer .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
}