:root {
  --cream-bg: #faf3e6;
  --cream-panel: #f6efe0;
  --cream-panel-alt: #efe4cc;
  --ink: #3a2e22;
  --ink-soft: #6b5a45;
  --accent: #b5652b;
  --accent-soft: #d99a5b;
  --brass: #8a6b45;
  --border: #d8c9a8;
  --shadow: 0 6px 20px rgba(90, 66, 34, 0.12);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  background: var(--cream-bg);
  background-image: radial-gradient(circle at 10% 10%, rgba(181, 101, 43, 0.05), transparent 40%),
    radial-gradient(circle at 90% 20%, rgba(138, 107, 69, 0.06), transparent 45%);
  color: var(--ink);
  font-family: 'Inter', 'Segoe UI', sans-serif;
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, .brand-title, .republican-date, .republican-year {
  font-family: 'Fraunces', 'Georgia', serif;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--cream-panel);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  border: 1px solid var(--brass);
  background: transparent;
  color: var(--ink);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.lang-switch:hover {
  background: var(--cream-panel-alt);
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--cream-bg);
  cursor: pointer;
  padding: 0 8px;
}

.burger-bar {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* Nav panel */
.main-nav {
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: min(300px, 85vw);
  background: var(--cream-panel);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: calc(1.5rem + env(safe-area-inset-top, 0px)) 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 30;
}

.main-nav.open {
  transform: translateX(0);
}

.nav-link {
  color: var(--ink);
  text-decoration: none;
  padding: 0.6rem 0.5rem;
  border-radius: 8px;
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  background: var(--cream-panel-alt);
  color: var(--accent);
}

.nav-section-label {
  margin: 1rem 0 0.1rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(58, 46, 34, 0.35);
  z-index: 25;
}

/* Main content */
main#app {
  flex: 1;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.today-heading {
  text-align: center;
  font-weight: 400;
  font-size: 1.4rem;
  color: var(--ink-soft);
  margin-bottom: 1.5rem;
}

.calendar-card {
  display: grid;
  grid-template-columns: minmax(180px, 220px) 1fr minmax(220px, 320px);
  gap: 1.5rem;
  align-items: stretch;
  background: var(--cream-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow);
}

.month-illustration {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  border-right: 1px dashed var(--border);
  padding-right: 1.5rem;
}

.month-illustration img {
  width: 100%;
  max-width: 150px;
  height: auto;
}

.month-period {
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-style: italic;
}

.date-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.3rem;
}

.decade-day {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0;
}

.republican-date {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0.1rem 0;
  font-weight: 600;
}

.republican-year {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin: 0;
}

.sextile-badge {
  display: inline-block;
  margin-top: 0.5rem;
  background: var(--accent);
  color: var(--cream-bg);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.gregorian-equivalent {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.description-panel {
  border-left: 1px dashed var(--border);
  padding-left: 1.5rem;
}

.month-name {
  margin: 0 0 0.2rem;
  font-size: 1.3rem;
}

.month-season-suffix {
  font-size: 0.8rem;
  color: var(--brass);
  margin: 0 0 0.6rem;
}

.month-etymology {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 0.6rem;
}

.month-description {
  margin: 0;
}

/* Form */
.convert-form {
  margin-top: 2rem;
  background: var(--cream-panel-alt);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
}

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

.convert-form label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
}

.convert-form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.convert-form-row input[type="date"] {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--cream-bg);
  color: var(--ink);
}

.convert-form-row button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.convert-form-row button.secondary {
  background: transparent;
  color: var(--accent);
}

.convert-form-row button:hover {
  filter: brightness(1.05);
}

.form-help {
  margin: 0.75rem 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.form-error {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: #a13f2b;
  font-weight: 600;
}

/* About view */
.about-view {
  background: var(--cream-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow);
}

.about-view h1 {
  margin-top: 0;
}

.about-content h2 {
  font-size: 1.15rem;
  color: var(--accent);
  margin: 1.5rem 0 0.5rem;
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  margin: 0 0 0.75rem;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem calc(1.5rem + env(safe-area-inset-bottom, 0px));
  font-size: 0.8rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 820px) {
  .calendar-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .month-illustration,
  .description-panel {
    border: none;
    padding: 0;
  }
  .month-illustration {
    padding-bottom: 1rem;
    border-bottom: 1px dashed var(--border);
  }
  .description-panel {
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 0.75rem 1rem;
  }
  main#app {
    padding: 1.5rem 0.9rem 2rem;
  }
  .calendar-card, .convert-form, .about-view {
    padding: 1.25rem;
  }
}