:root {
  --bg: #0f1115;
  --card-bg: #171a21;
  --border: #262b36;
  --text: #e7e9ee;
  --muted: #9aa3b2;
  --accent: #5b9dff;
  --accent-strong: #3a7bff;
  --good: #4caf6d;
  --warn: #e0a13a;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --border: #e2e4ea;
    --text: #1a1d24;
    --muted: #5b6270;
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
}

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

.app {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

header h1 {
  font-size: 1.6rem;
  margin-bottom: 0.4rem;
}

.subtitle {
  color: var(--muted);
  margin-top: 0;
  font-size: 0.95rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem 1.6rem;
  margin-top: 1.4rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.loading {
  color: var(--muted);
  font-style: italic;
}

.error {
  color: #e05a5a;
}

.bios-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  margin-bottom: 1rem;
}

.bios-field .label {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.bios-field .value {
  font-size: 1.05rem;
  font-weight: 600;
}

.bios-actions {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  cursor: pointer;
}

.btn.primary {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: white;
  font-weight: 600;
}

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

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.8rem;
  line-height: 1.4;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.spec-group h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0 0 0.4rem;
}

.spec-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

.spec-group li span.k {
  color: var(--muted);
}

footer {
  margin-top: 1.6rem;
  text-align: right;
}

#refresh-btn {
  padding: 0.55rem 1.2rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
}

#refresh-btn:hover {
  border-color: var(--accent);
}