:root {
  --brand: #0b5fa5;
  --brand-strong: color-mix(in srgb, var(--brand) 80%, #000);
  --brand-soft: color-mix(in srgb, var(--brand) 13%, var(--surface));
  --accent: #0f9d8f;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1c2733;
  --muted: #5f6b7a;
  --border: #d5dde7;
  --danger: #c0392b;
  --danger-soft: #fdecea;
  --success: #1e8e5a;
  --success-soft: #e5f5ec;
  --info-soft: var(--brand-soft);
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 16px rgba(16, 24, 40, 0.06);
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #4d9be0;
    --brand-strong: color-mix(in srgb, var(--brand) 80%, #fff);
    --accent: #3cc1b3;
    --bg: #0f1620;
    --surface: #17212d;
    --text: #e6edf5;
    --muted: #9aa8b8;
    --border: #2b3a4b;
    --danger: #ef6b5d;
    --danger-soft: #3a1d1b;
    --success: #4cc38a;
    --success-soft: #16352a;
    --shadow: none;
    color-scheme: dark;
  }
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

h1,
h2,
h3 {
  line-height: 1.3;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
}

h1:focus,
h2:focus {
  outline: none;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.875rem;
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

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

.btn.primary:hover:not(:disabled) {
  background: var(--brand-strong);
}

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

.btn.secondary:hover:not(:disabled) {
  border-color: var(--brand);
}

.btn.ghost {
  background: transparent;
  color: var(--muted);
}

.btn.ghost:hover:not(:disabled) {
  color: var(--text);
}

.btn.danger {
  background: var(--surface);
  color: var(--danger);
  border-color: var(--border);
}

.btn.danger:hover:not(:disabled) {
  border-color: var(--danger);
}

.btn.sm {
  min-height: 36px;
  padding: 6px 12px;
  font-size: 0.875rem;
}

.btn.loading:disabled {
  opacity: 0.85;
}

.spinner,
.btn-spinner {
  border-radius: 50%;
  border: 3px solid var(--brand-soft);
  border-top-color: var(--brand);
  animation: spin 0.8s linear infinite;
}

.spinner {
  width: 40px;
  height: 40px;
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border-width: 2px;
  border-color: rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1.5s !important;
    transition: none !important;
  }
}

.alert {
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.95rem;
}

.alert.success {
  background: var(--success-soft);
  color: var(--success);
}

.noscript {
  padding: 24px 16px;
  text-align: center;
}