:root {
  --paper: #f4ede0;
  --paper-deep: #ebe1cd;
  --ink: #1a1612;
  --ink-soft: #4a3f33;
  --ink-faded: #7a6a55;
  --rule: #b8a888;
  --accent: #6b2c2c;        /* Russian red */
  --accent-soft: #c9a48f;
  --highlight: #e8d4a8;
  --green-go: #3d5a2c;
  --crimson: #8b1a1a;

  --serif: 'Cormorant Garamond', Georgia, serif;
  --reading: 'PT Serif', Georgia, serif;
  --mono: 'JetBrains Mono', 'Courier New', monospace;
  --type: 'Special Elite', 'Courier New', monospace;
}

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

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 25% 25%, rgba(107, 44, 44, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 75% 75%, rgba(140, 100, 60, 0.06) 0%, transparent 50%),
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.005) 2px, rgba(0,0,0,0.005) 4px);
}

/* MASTHEAD */
.masthead { border-bottom: 4px double var(--ink); padding: 2.5rem 1.5rem 2rem; text-align: center; }
.masthead-inner { max-width: 1100px; margin: 0 auto; }
.dateline {
  display: flex; justify-content: space-between;
  font-family: var(--type); font-size: 0.75rem; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--ink-soft);
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0; margin-bottom: 1.5rem;
}
.title {
  font-family: var(--serif); font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700; font-style: italic; line-height: 1; margin-bottom: 0.5rem;
}
.subtitle {
  font-family: var(--type); font-size: 0.85rem; letter-spacing: 0.05em;
  color: var(--ink-soft); max-width: 60ch; margin: 0 auto;
}

/* MODE NAV */
.mode-switch {
  display: flex; justify-content: center;
  padding: 1.5rem; border-bottom: 1px solid var(--rule);
  background: var(--paper-deep); flex-wrap: wrap;
}
.mode {
  background: transparent; border: none;
  font-family: var(--type); font-size: 0.85rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-soft);
  padding: 0.6rem 1.2rem; cursor: pointer; position: relative;
}
.mode::after {
  content: "·"; position: absolute; right: -2px; top: 50%;
  transform: translateY(-50%); color: var(--rule);
}
.mode:last-child::after { display: none; }
.mode:hover { color: var(--accent); }
.mode.active { color: var(--ink); font-weight: 700; }
.mode.active::before {
  content: "❦"; display: block; position: absolute;
  top: -0.4rem; left: 50%; transform: translateX(-50%);
  font-size: 0.8rem; color: var(--accent);
}

/* PANELS */
.bench { max-width: 900px; margin: 3rem auto; padding: 0 1.5rem; }
.panel { display: none; animation: fadeIn 0.4s ease; }
.panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.panel-header {
  display: flex; justify-content: space-between; align-items: baseline;
  flex-wrap: wrap; gap: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.75rem; margin-bottom: 1.25rem;
}
.panel-header h2,
.panel > h2 {
  font-family: var(--serif); font-style: italic; font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}
.panel > h2 {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.75rem; margin-bottom: 1.25rem;
}

.stats { display: flex; gap: 1.5rem; }
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-family: var(--serif); font-size: 1.8rem; font-weight: 700;
  font-style: italic; line-height: 1; color: var(--accent);
}
.stat-label {
  font-family: var(--type); font-size: 0.65rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-faded); margin-top: 0.2rem;
}

.lede {
  font-family: var(--serif); font-size: 1.15rem; line-height: 1.7;
  color: var(--ink-soft); font-style: italic;
  margin-bottom: 2rem; max-width: 60ch;
}

/* CARD AREA */
.card-area {
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  padding: 2.5rem 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.big-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  padding: 3rem 1.5rem;
  margin: 0 auto 2rem;
  max-width: 320px;
  position: relative;
  box-shadow: 4px 4px 0 var(--rule);
}
.big-card::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid var(--rule);
  pointer-events: none;
}

.big-letter {
  font-family: var(--reading);
  font-size: clamp(5rem, 14vw, 8rem);
  font-weight: 700;
  display: block;
  line-height: 1;
  color: var(--ink);
}

.translit-card { padding: 2rem 1.5rem; }

.cyrillic-word {
  font-family: var(--reading);
  font-size: clamp(2.5rem, 7vw, 4rem);
  font-weight: 700;
  display: block;
  color: var(--ink);
  line-height: 1.2;
}

/* CHOICES */
.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  max-width: 400px;
  margin: 0 auto;
}
.choice-btn {
  font-family: var(--reading);
  font-size: 1.4rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 1rem;
  cursor: pointer;
  transition: all 0.15s;
  font-weight: 500;
}
.choice-btn:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}
.choice-btn.correct {
  background: var(--green-go);
  color: var(--paper);
  border-color: var(--green-go);
  animation: pulseGreen 0.4s ease;
}
.choice-btn.wrong {
  background: var(--crimson);
  color: var(--paper);
  border-color: var(--crimson);
  animation: shake 0.4s ease;
}
.choice-btn:disabled { cursor: not-allowed; }

@keyframes pulseGreen {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* TRANSLIT INPUT */
.trans-input-row {
  display: flex;
  gap: 0.5rem;
  max-width: 500px;
  margin: 0 auto 1rem;
}
.trans-input-row input {
  flex: 1;
  font-family: var(--mono);
  font-size: 1.1rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 0.75rem 1rem;
  color: var(--ink);
}
.trans-input-row input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--highlight);
}
.trans-input-row input.correct {
  background: rgba(61, 90, 44, 0.15);
  border-color: var(--green-go);
}
.trans-input-row input.wrong {
  background: rgba(139, 26, 26, 0.1);
  border-color: var(--crimson);
}

.feedback {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
  min-height: 1.5em;
  margin-top: 1rem;
  color: var(--ink-soft);
}
.feedback.correct { color: var(--green-go); font-weight: 600; }
.feedback.wrong { color: var(--crimson); }

.hint-meaning {
  font-family: var(--type);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faded);
  min-height: 1em;
}

/* FLASHCARDS */
.flashcard-area { padding-bottom: 1rem; }

.flashcard {
  perspective: 1200px;
  max-width: 520px;
  margin: 0 auto 2rem;
  cursor: pointer;
  height: 280px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--rule);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 1.5rem;
  text-align: center;
}
.flashcard-face::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid var(--rule);
  pointer-events: none;
}
.flashcard-back { transform: rotateY(180deg); background: var(--paper-deep); }

.card-language-tag {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-family: var(--type);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  background: var(--ink);
  color: var(--paper);
  padding: 0.2rem 0.5rem;
}

.card-text {
  font-family: var(--reading);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}
.card-translit {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink-faded);
  letter-spacing: 0.05em;
}
.card-context {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 36ch;
}

.flashcard-controls {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

/* CONTROL ROW */
.control-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
}
.control-row label {
  font-family: var(--type);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.control-row select {
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 0.4rem 0.6rem;
  color: var(--ink);
}
.actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* BUTTONS */
.btn-primary, .btn-secondary, .btn-ghost {
  font-family: var(--type);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: all 0.18s;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }
.btn-secondary { background: var(--paper); color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); }
.btn-ghost { background: transparent; border-color: var(--ink-faded); color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }

/* REFERENCE */
.alphabet-table {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.5rem;
  margin: 1.5rem 0 2rem;
}
.alpha-cell {
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  padding: 1rem 0.5rem;
  text-align: center;
}
.alpha-cell .pair {
  font-family: var(--reading);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--ink);
}
.alpha-cell .sound {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-faded);
  display: block;
}
.alpha-cell .as-in {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink-soft);
  display: block;
  margin-top: 0.2rem;
}

.sub-section {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.6rem;
  margin: 2.5rem 0 0.75rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
}

.ref-text {
  font-family: var(--serif);
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 1rem;
  max-width: 65ch;
}

.false-friends {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
}
.friend-cell {
  background: var(--paper-deep);
  border-left: 3px solid var(--crimson);
  padding: 1rem 1.25rem;
}
.friend-cell .glyph {
  font-family: var(--reading);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--ink);
}
.friend-cell .gotcha {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

/* FOOTER */
.footer {
  border-top: 4px double var(--ink);
  padding: 2rem 1.5rem;
  text-align: center;
  font-family: var(--type);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin-top: 4rem;
}

@media (max-width: 700px) {
  .dateline { font-size: 0.6rem; gap: 0.4rem; }
  .dateline-center { font-size: 0.65rem; }
  .control-row { flex-direction: column; align-items: stretch; }
  .actions { justify-content: stretch; }
  .actions button { flex: 1; }
  .panel-header { flex-direction: column; align-items: flex-start; }
  .stats { width: 100%; justify-content: flex-start; }
  .choice-grid { grid-template-columns: 1fr 1fr; }
  .flashcard { height: 240px; }
}