:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --bg-elevated: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #0d9488;
  --accent-strong: #0f766e;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --random-number: #512bd4;
  --random-weather: #0d9488;
  --current-datetime: #2563eb;
  --success: #059669;
  --error: #dc2626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --bg-elevated: #111827;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1f2937;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(13, 148, 136, 0.18), transparent),
    var(--bg);
  line-height: 1.5;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: 2rem 1.5rem 1rem;
}

.header__brand {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header__logo {
  flex-shrink: 0;
  filter: drop-shadow(0 4px 12px rgba(13, 148, 136, 0.35));
}

.header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header__subtitle {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.main {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
}

.intro {
  margin-bottom: 1.75rem;
}

.intro h2 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.intro p {
  margin: 0;
  color: var(--text-muted);
  max-width: 52ch;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
}

.card--random_number { --runtime-color: var(--random-number); }
.card--random_weather { --runtime-color: var(--random-weather); }
.card--current_datetime { --runtime-color: var(--current-datetime); }

.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.card__label {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--runtime-color);
  background: color-mix(in srgb, var(--runtime-color) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--runtime-color) 28%, transparent);
}

.card__value-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 4.5rem;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--runtime-color) 6%, var(--bg));
  border: 1px dashed color-mix(in srgb, var(--runtime-color) 22%, var(--border));
}

.card--current_datetime .card__value-wrap {
  min-height: 5.5rem;
}

.card--current_datetime .card__value {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  padding: 0 0.75rem;
  white-space: normal;
  word-break: break-word;
  hyphens: auto;
}

.card--random_weather .card__value {
  font-size: 1.75rem;
  text-transform: capitalize;
}

.card__value {
  font-size: 2.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  color: var(--runtime-color);
}

.card__value--loading {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.card__value--error {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--error);
  text-align: center;
  padding: 0 0.5rem;
}

.spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid color-mix(in srgb, var(--runtime-color) 25%, transparent);
  border-top-color: var(--runtime-color);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.card--loaded .card__value-wrap {
  border-style: solid;
  background: color-mix(in srgb, var(--success) 8%, var(--bg));
  border-color: color-mix(in srgb, var(--success) 25%, var(--border));
}

.card--loaded .card__value {
  color: var(--text);
}

.card--error .card__value-wrap {
  background: color-mix(in srgb, var(--error) 8%, var(--bg));
  border-color: color-mix(in srgb, var(--error) 30%, var(--border));
}

.card__refresh {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  align-self: flex-start;
  margin-top: auto;
  padding: 0.45rem 0.85rem;
  border: 1px solid color-mix(in srgb, var(--runtime-color) 30%, var(--border));
  border-radius: 999px;
  background: color-mix(in srgb, var(--runtime-color) 8%, var(--bg-elevated));
  color: var(--runtime-color);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.card__refresh:hover:not(:disabled) {
  background: color-mix(in srgb, var(--runtime-color) 16%, var(--bg-elevated));
  border-color: color-mix(in srgb, var(--runtime-color) 45%, var(--border));
}

.card__refresh:active:not(:disabled) {
  transform: scale(0.97);
}

.card__refresh:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.card__refresh-icon {
  width: 1rem;
  height: 1rem;
}

.card__refresh:not(:disabled):hover .card__refresh-icon {
  animation: spin 0.7s linear;
}

.footer {
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-elevated) 70%, transparent);
}

.footer p {
  margin: 0;
}

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

@media (max-width: 480px) {
  .header {
    padding-top: 1.5rem;
  }

  .card__value {
    font-size: 1.85rem;
  }
}