:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #2a2f3a;
  --text: #e8eaed;
  --text-dim: #9aa1ac;
  --accent: #5b8cff;
  --accent-hover: #7ba0ff;
  --danger: #ff6b6b;
  --radius: 0;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --panel: #ffffff;
    --border: #dfe3e8;
    --text: #16181d;
    --text-dim: #5b6270;
    --accent: #3f66e0;
    --accent-hover: #3355c9;
    --danger: #d43f3f;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.header {
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 60ch;
}

.input-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 0.35rem 0.5rem;
  flex: 1 1 200px;
  min-width: 160px;
}

.input-group .swatch-dot {
  width: 20px;
  height: 20px;
  border-radius: 0;
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: transparent;
  transition: background-color 0.15s ease;
}

.input-group input {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.95rem;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  width: 100%;
  outline: none;
  padding: 0.3rem 0;
}

.input-group input::placeholder {
  color: var(--text-dim);
  font-family: inherit;
}

.input-group.invalid {
  border-color: var(--danger);
}

.remove-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}

.remove-btn:hover {
  color: var(--danger);
  background: rgba(255, 107, 107, 0.1);
}

.controls {
  display: flex;
  gap: 0.75rem;
}

.btn {
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

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

.form-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0.75rem 0 0;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  border: 1px solid var(--border);
}

.swatch-card {
  border-right: 1px solid var(--border);
  background: var(--panel);
}

.swatch-card:last-child {
  border-right: none;
}

.swatch-block {
  width: 100%;
  aspect-ratio: 1.4 / 1;
}

.swatch-label {
  text-align: center;
  padding: 0.6rem 0.5rem;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.empty-state {
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
  padding: 2rem 1rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.url-error-banner {
  grid-column: 1 / -1;
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 0;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
}