:root {
  --color-primary: #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-background: #f4f6fb;
  --color-surface: #ffffff;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-danger: #b91c1c;
  --color-success: #15803d;
  --radius-medium: 14px;
  --radius-large: 20px;
  --shadow-soft: 0 4px 16px rgba(30, 58, 138, 0.08);
  --transition-fast: 0.18s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-background);
  color: var(--color-text);
  font-family: Arial, Helvetica, sans-serif;
}

.app-header {
  position: relative;
  padding: 1.25rem 1rem;
  color: #ffffff;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  box-shadow: var(--shadow-soft);
}

.header-icon-link {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  line-height: 1;
  text-decoration: none;
  color: #ffffff;
  opacity: 0.9;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.header-icon-left {
  left: 1rem;
}

.header-icon-right {
  right: 1rem;
}

.header-icon-link:hover,
.header-icon-link:focus-visible {
  opacity: 1;
  transform: translateY(calc(-50% - 2px));
}

.app-header h1 {
  font-size: 1.4rem;
}

.app-header span {
  font-weight: 400;
  opacity: 0.85;
}

.app-container {
  flex: 1;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.screen {
  animation: fade-in 0.25s ease;
}

.hidden {
  display: none !important;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

#selection-screen h2 {
  margin-bottom: 0.4rem;
  font-size: 1.15rem;
  text-align: center;
}

.subtitle {
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: center;
}

.digit-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
}

.digit-button {
  aspect-ratio: 1;
  border: 0;
  border-radius: var(--radius-medium);
  color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  font-size: 1.4rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.digit-button:hover,
.digit-button:focus-visible {
  color: #ffffff;
  background: var(--color-primary);
  transform: translateY(-2px);
}

.digit-button:active {
  transform: scale(0.96);
}

.plate-summary-card {
  margin-bottom: 1.25rem;
  padding: 1.5rem;
  border-radius: var(--radius-large);
  color: #ffffff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.plate-summary-label {
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
  opacity: 0.85;
}

.selected-digit-display {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
}

.result-card {
  margin-bottom: 1rem;
  padding: 1.5rem;
  border-radius: var(--radius-large);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.result-status {
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.result-message {
  font-size: 1.1rem;
  font-weight: 700;
}

.result-message.restricted {
  color: var(--color-danger);
}

.result-message.free {
  color: var(--color-success);
}

.next-restriction-message {
  min-height: 1.25rem;
  margin-top: 0.75rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.listen-btn,
.calendar-btn,
.secondary-btn {
  display: block;
  width: 100%;
  padding: 0.85rem;
  border-radius: var(--radius-medium);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.listen-btn {
  margin-bottom: 0.75rem;
  border: 0;
  color: #ffffff;
  background: var(--color-primary-light);
}

.listen-btn:hover,
.listen-btn:focus-visible {
  background: var(--color-primary);
  transform: translateY(-1px);
}

.calendar-btn {
  margin-bottom: 0.75rem;
  border: 0;
  color: #ffffff;
  background: var(--color-success);
}

.calendar-btn:hover,
.calendar-btn:focus-visible {
  background: #0f5c30;
  transform: translateY(-1px);
}

.secondary-btn {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.secondary-btn:hover,
.secondary-btn:focus-visible {
  color: #ffffff;
  background: var(--color-primary);
}

.app-footer {
  padding: 1rem;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-align: center;
}

.app-footer .credits {
  margin-top: 0.35rem;
  font-size: 0.7rem;
  opacity: 0.85;
}

#calendar-screen h2 {
  margin-bottom: 0.4rem;
  font-size: 1.15rem;
  text-align: center;
}

.calendar-dates-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 1rem 0 1.25rem;
}

.calendar-date-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.calendar-date-label {
  font-size: 0.9rem;
  color: var(--color-text);
}

.calendar-date-add-btn {
  flex-shrink: 0;
  border: 0;
  border-radius: 10px;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--color-success);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.calendar-date-add-btn:hover,
.calendar-date-add-btn:focus-visible {
  background: #0f5c30;
  transform: translateY(-1px);
}

.calendar-empty {
  margin: 1rem 0 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: center;
}

@media (min-width: 480px) {
  .digit-grid {
    gap: 1rem;
  }
}

/* ---------------------------- Info page ---------------------------- */

.info-container {
  flex: 1;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.info-section {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  border-radius: var(--radius-large);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.info-section h2 {
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  color: var(--color-primary);
}

.info-section p {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.info-section p:last-child {
  margin-bottom: 0;
}

.info-section ol,
.info-section ul {
  margin: 0 0 0.75rem 1.25rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

.info-section ol:last-child,
.info-section ul:last-child {
  margin-bottom: 0;
}

.info-highlight {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-medium);
  background: rgba(30, 58, 138, 0.08);
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
}