:root {
  --font-display: 'Cinzel', serif;
  --font-body: 'Crimson Pro', Georgia, serif;
  --font-glagolitic: 'Noto Sans Glagolitic', serif;

  --color-bg: #e8dcc8;
  --color-bg-pattern: rgba(139, 109, 76, 0.06);
  --color-surface: #f5efe3;
  --color-surface-border: #8b6d4c;
  --color-surface-shadow: rgba(62, 44, 28, 0.15);
  --color-text: #2c1e12;
  --color-text-muted: #5c4a38;
  --color-accent: #7a4f2e;
  --color-accent-hover: #5c3a22;
  --color-accent-light: #c9a66b;
  --color-input-bg: #faf6ef;
  --color-input-border: #a08060;
  --color-btn-secondary-bg: #ddd0bc;
  --color-btn-secondary-hover: #cfc0a8;
  --color-focus: #7a4f2e;
  --color-toggle-bg: #b8a48c;
  --color-toggle-active: #7a4f2e;
}

[data-theme='dark'] {
  --color-bg: #1a1410;
  --color-bg-pattern: rgba(201, 166, 107, 0.04);
  --color-surface: #2a2218;
  --color-surface-border: #6b5438;
  --color-surface-shadow: rgba(0, 0, 0, 0.4);
  --color-text: #e8dcc8;
  --color-text-muted: #a89070;
  --color-accent: #c9a66b;
  --color-accent-hover: #dbb97e;
  --color-accent-light: #8b6d4c;
  --color-input-bg: #1f1812;
  --color-input-border: #5c4a38;
  --color-btn-secondary-bg: #3a3028;
  --color-btn-secondary-hover: #4a3e34;
  --color-focus: #c9a66b;
  --color-toggle-bg: #4a3e34;
  --color-toggle-active: #c9a66b;
}

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

html {
  font-size: 18px;
}

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

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

/* Header */

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header-ornament {
  font-size: 1.2rem;
  color: var(--color-accent-light);
  margin-bottom: 0.5rem;
  letter-spacing: 0.5em;
}

.title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

.subtitle {
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 1rem;
}

.header-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-display);
}

.select {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--color-input-border);
  border-radius: 3px;
  background: var(--color-input-bg);
  color: var(--color-text);
  cursor: pointer;
}

.select:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Theme toggle */

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.theme-toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.theme-toggle-slider {
  position: relative;
  width: 2.8rem;
  height: 1.4rem;
  background: var(--color-toggle-bg);
  border-radius: 1rem;
  border: 1px solid var(--color-input-border);
  transition: background 0.2s;
}

.theme-toggle-slider::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 1rem;
  height: 1rem;
  background: var(--color-surface);
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px var(--color-surface-shadow);
}

.theme-toggle-input:checked + .theme-toggle-slider {
  background: var(--color-toggle-active);
}

.theme-toggle-input:checked + .theme-toggle-slider::after {
  transform: translateX(1.4rem);
}

.theme-toggle-input:focus-visible + .theme-toggle-slider {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Manuscript card */

.manuscript {
  background: var(--color-surface);
  border: 2px solid var(--color-surface-border);
  border-radius: 4px;
  padding: 1.75rem;
  box-shadow:
    0 4px 20px var(--color-surface-shadow),
    inset 0 0 60px var(--color-bg-pattern);
  position: relative;
}

.manuscript::before,
.manuscript::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-accent-light);
  opacity: 0.5;
}

.manuscript::before {
  top: 8px;
  left: 8px;
  border-right: none;
  border-bottom: none;
}

.manuscript::after {
  bottom: 8px;
  right: 8px;
  border-left: none;
  border-top: none;
}

/* Controls */

.controls {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-input-border);
}

.fieldset {
  border: none;
  margin: 0;
  padding: 0;
}

.fieldset legend {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-right: 1.25rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.radio-label input[type='radio'] {
  accent-color: var(--color-accent);
}

/* Text panels */

.text-panels {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: start;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.panel-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

.textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--color-input-border);
  border-radius: 3px;
  background: var(--color-input-bg);
  color: var(--color-text);
  resize: vertical;
  min-height: 180px;
  line-height: 1.6;
}

.textarea-output {
  font-family: var(--font-glagolitic), var(--font-body);
  font-size: 1.15rem;
}

.textarea:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

.textarea[readonly] {
  opacity: 0.95;
}

.panel-actions {
  display: flex;
  align-items: center;
  padding-top: 2rem;
}

/* Buttons */

.btn {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--color-surface-border);
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-primary {
  align-self: flex-start;
  background: var(--color-accent);
  color: #faf6ef;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-secondary {
  background: var(--color-btn-secondary-bg);
  color: var(--color-text);
  white-space: nowrap;
}

.btn-secondary:hover {
  background: var(--color-btn-secondary-hover);
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Tabs */

.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-input-border);
}

.tab {
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.65rem 1.25rem;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.tab-panel[hidden] {
  display: none;
}

.controls-shared {
  padding-bottom: 1rem;
  margin-bottom: 0;
  border-bottom: none;
}

/* Train */

.train-reference {
  margin-bottom: 1.5rem;
}

.train-table-toggle {
  width: 100%;
}

.train-table-panel {
  margin-top: 0.75rem;
  max-height: 280px;
  overflow: auto;
  border: 1px solid var(--color-input-border);
  border-radius: 3px;
  background: var(--color-input-bg);
}

.train-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.train-table th,
.train-table td {
  padding: 0.45rem 0.75rem;
  text-align: center;
  border-bottom: 1px solid var(--color-input-border);
}

.train-table th {
  font-family: var(--font-display);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  background: var(--color-btn-secondary-bg);
  position: sticky;
  top: 0;
}

.train-table tbody tr:last-child td {
  border-bottom: none;
}

.train-table tbody tr:hover {
  background: var(--color-bg-pattern);
}

.train-table-glagolitic {
  font-family: var(--font-glagolitic), var(--font-body);
  font-size: 1.15rem;
}

.train-area {
  text-align: center;
  padding: 1rem 0 0.5rem;
}

.train-instruction {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin: 0 0 1.25rem;
}

.train-prompt {
  font-family: var(--font-body);
  font-size: 4rem;
  line-height: 1.2;
  color: var(--color-accent);
  margin-bottom: 2rem;
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.train-prompt-glagolitic {
  font-family: var(--font-glagolitic), var(--font-body);
}

.train-choices {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  max-width: 420px;
  margin: 0 auto 1.5rem;
}

.train-choice {
  font-family: var(--font-body);
  font-size: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--color-input-border);
  border-radius: 3px;
  background: var(--color-input-bg);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.train-choice-glagolitic {
  font-family: var(--font-glagolitic), var(--font-body);
  font-size: 1.75rem;
}

.train-choice:hover:not(:disabled) {
  border-color: var(--color-accent);
  background: var(--color-btn-secondary-bg);
}

.train-choice:disabled {
  cursor: default;
}

.train-choice-correct {
  border-color: #3a7d44;
  background: rgba(58, 125, 68, 0.15);
  color: #3a7d44;
}

[data-theme='dark'] .train-choice-correct {
  border-color: #6db87a;
  background: rgba(109, 184, 122, 0.15);
  color: #6db87a;
}

.train-choice-wrong {
  border-color: #a04040;
  background: rgba(160, 64, 64, 0.15);
  color: #a04040;
}

[data-theme='dark'] .train-choice-wrong {
  border-color: #e07070;
  background: rgba(224, 112, 112, 0.15);
  color: #e07070;
}

.train-feedback {
  min-height: 1.5rem;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.train-feedback-correct {
  color: #3a7d44;
}

[data-theme='dark'] .train-feedback-correct {
  color: #6db87a;
}

.train-feedback-wrong {
  color: #a04040;
}

[data-theme='dark'] .train-feedback-wrong {
  color: #e07070;
}

.train-score {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin: 0;
}

/* Footer */

.footer {
  text-align: center;
  margin-top: 2rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-ornament {
  font-family: var(--font-glagolitic);
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  opacity: 0.6;
}

.footer-link:hover.footer-ornament {
  opacity: 1;
}

.footer-link {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Responsive */

@media (max-width: 700px) {
  html {
    font-size: 16px;
  }

  .text-panels {
    grid-template-columns: 1fr;
  }

  .panel-actions {
    justify-content: center;
    padding-top: 0;
  }

  .controls {
    flex-direction: column;
    gap: 1rem;
  }

  .train-prompt {
    font-size: 3rem;
    min-height: 4rem;
  }

  .train-choices {
    grid-template-columns: 1fr 1fr;
    max-width: none;
  }
}