:root {
  --color-bg: #f7f7f8;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-border: #e0e0e0;
  --color-primary: #1a1a1a;
  --color-primary-text: #ffffff;
  --color-slot-bg: #f0f0f1;
  --color-slot-bg-hover: #e4e4e6;
  --color-slot-selected: #1a1a1a;
  --color-slot-selected-text: #ffffff;
  --color-slot-disabled: #f7f7f8;
  --color-slot-disabled-text: #bbbbbb;
  --color-error: #b3261e;
  --color-error-bg: #fdecea;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121212;
    --color-surface: #1c1c1e;
    --color-text: #f2f2f2;
    --color-text-muted: #a0a0a0;
    --color-border: #333333;
    --color-primary: #f2f2f2;
    --color-primary-text: #121212;
    --color-slot-bg: #2a2a2c;
    --color-slot-bg-hover: #343436;
    --color-slot-selected: #f2f2f2;
    --color-slot-selected-text: #121212;
    --color-slot-disabled: #1c1c1e;
    --color-slot-disabled-text: #555555;
    --color-error: #ff6b60;
    --color-error-bg: #3a1f1d;
  }
}

* {
  box-sizing: border-box;
}

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

.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.page__header h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
}

.page__subtitle {
  color: var(--color-text-muted);
  margin: 0 0 24px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.card h2 {
  font-size: 1.05rem;
  margin: 0 0 16px;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.field__label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.field input,
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.fieldset {
  border: 0;
  padding: 0;
}

.phone-row {
  display: grid;
  grid-template-columns: minmax(108px, 0.8fr) minmax(0, 1.4fr);
  gap: 8px;
}

.phone-row__country,
.phone-row__number {
  display: block;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.status {
  min-height: 1.2em;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.slots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.slot-btn {
  padding: 10px 4px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-slot-bg);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
}

.slot-btn:hover:not(:disabled) {
  background: var(--color-slot-bg-hover);
}

.slot-btn[aria-pressed="true"] {
  background: var(--color-slot-selected);
  color: var(--color-slot-selected-text);
  border-color: var(--color-slot-selected);
}

.slot-btn:disabled {
  background: var(--color-slot-disabled);
  color: var(--color-slot-disabled-text);
  cursor: not-allowed;
}

.selected-slot {
  font-weight: 600;
  margin-top: 0;
}

.btn {
  display: inline-block;
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 4px;
}

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

.btn--primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn--text {
  background: transparent;
  color: var(--color-text-muted);
  text-decoration: underline;
  margin-top: 8px;
}

.error {
  background: var(--color-error-bg);
  color: var(--color-error);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 12px;
}