@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,600;0,700;1,600&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root {
  --color-black: #000000;
  --color-tan: #86745c;
  --color-light-tan: #c2baab;
  --color-dark-tan: #6a5c48;
  --color-white: #ffffff;
  --color-black-63: rgba(0, 0, 0, 0.63);
  --color-black-80: rgba(0, 0, 0, 0.8);
  --color-black-88: rgba(0, 0, 0, 0.88);
  --color-gold: #b19977;
  --color-accent: #b19977;
  --color-accent-light: #c2baab;

  --paper: #fbf9f6;
  --card: #ffffff;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: #ece5d8;
  background-image:
    radial-gradient(at 12% 0%, rgba(177, 153, 119, 0.35) 0, transparent 55%),
    radial-gradient(at 88% 12%, rgba(134, 116, 92, 0.28) 0, transparent 50%),
    radial-gradient(at 100% 100%, rgba(0, 0, 0, 0.12) 0, transparent 45%),
    linear-gradient(160deg, #ffffff 0%, #f2ede4 38%, #e4dac9 78%, #d8cab0 100%);
  background-attachment: fixed;
  color: var(--color-black-88);
  font-family: var(--font-body);
  line-height: 1.5;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

a { color: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-black);
  color: var(--color-white);
  padding: 8px 14px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
}

/* ---------- Header / Drawer rail ---------- */
.site-header {
  background: var(--color-black);
  color: var(--color-white);
  border-bottom: 6px solid var(--color-gold);
}
.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 28px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
}
.brand__mark {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  border: 1px solid var(--color-gold);
  padding: 3px 7px;
  border-radius: 2px;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--color-white);
}
.site-nav {
  display: flex;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-nav a {
  text-decoration: none;
  color: var(--color-light-tan);
  border-bottom: 1px solid transparent;
  padding-bottom: 3px;
  transition: color .15s ease, border-color .15s ease;
}
.site-nav a:hover, .site-nav a.is-active { color: var(--color-white); border-color: var(--color-gold); }

/* ---------- Shell ---------- */
.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 28px 90px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-tan);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
}
.eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  background: var(--color-gold);
  display: inline-block;
}

.page-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.9rem);
  margin: 0 0 8px;
  color: var(--color-black);
}
.page-lede {
  max-width: 62ch;
  color: var(--color-black-63);
  font-size: 1.05rem;
  margin: 0 0 8px;
}

/* ---------- Hero (home) ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
  padding-bottom: 46px;
  border-bottom: 1px dashed var(--color-light-tan);
  margin-bottom: 46px;
}
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; }
}
.hero p { color: var(--color-black-80); font-size: 1.05rem; max-width: 54ch; }

.hero-card {
  background: var(--color-black);
  color: var(--color-white);
  border-radius: 4px;
  padding: 26px 26px 22px;
  position: relative;
  box-shadow: 0 18px 40px -18px var(--color-black-63);
}
.hero-card::before {
  content: '';
  position: absolute;
  top: 18px; left: 18px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: inset 0 0 0 1.5px var(--color-black-63);
}
.hero-card__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
  padding-left: 30px;
}
.hero-card__term {
  font-family: var(--font-display);
  font-size: 1.7rem;
  margin: 10px 0 14px;
  padding-left: 30px;
}
.hero-card__def {
  border-top: 1px dashed var(--color-black-63);
  padding-top: 14px;
  color: var(--color-light-tan);
  font-size: 0.96rem;
}

/* ---------- Section grid (catalog tabs) ---------- */
.grid-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 18px;
  flex-wrap: wrap;
  gap: 10px;
}
.grid-heading h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0;
}
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 18px;
  margin-bottom: 54px;
}
.section-tab {
  position: relative;
  display: block;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--color-light-tan);
  border-radius: 3px;
  padding: 22px 20px 20px;
  color: var(--color-black-88);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.section-tab::before {
  content: attr(data-index);
  position: absolute;
  top: -11px;
  left: 18px;
  background: var(--color-gold);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}
.section-tab:hover {
  transform: translateY(-3px);
  border-color: var(--color-gold);
  box-shadow: 0 14px 28px -18px var(--color-black-63);
}
.section-tab h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 10px 0 6px;
}
.section-tab .count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-tan);
}

/* ---------- Test cards ---------- */
.test-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.test-card {
  background: var(--color-dark-tan);
  color: var(--color-white);
  border-radius: 4px;
  padding: 26px 24px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.test-card:hover { transform: translateY(-3px); box-shadow: 0 16px 32px -16px var(--color-black-63); }
.test-card__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-light);
}
.test-card h3 { font-family: var(--font-display); font-size: 1.6rem; margin: 0; }
.test-card p { margin: 0; color: rgba(255,255,255,0.82); font-size: 0.95rem; }
.test-card__cta {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.test-card__cta::after { content: '→'; transition: transform .15s ease; }
.test-card:hover .test-card__cta::after { transform: translateX(4px); }

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 26px 0 30px;
}
.mode-toggle {
  display: inline-flex;
  border: 1px solid var(--color-tan);
  border-radius: 3px;
  overflow: hidden;
}
.mode-toggle button {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--color-white);
  color: var(--color-dark-tan);
  border: none;
  padding: 9px 16px;
  cursor: pointer;
}
.mode-toggle button + button { border-left: 1px solid var(--color-tan); }
.mode-toggle button.is-active { background: var(--color-black); color: var(--color-white); }

.search-input {
  flex: 1 1 220px;
  max-width: 320px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  padding: 9px 14px;
  border: 1px solid var(--color-tan);
  border-radius: 3px;
  background: var(--color-white);
  color: var(--color-black-88);
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--color-black);
  background: var(--color-black);
  color: var(--color-white);
  padding: 10px 18px;
  border-radius: 3px;
  cursor: pointer;
  transition: opacity .15s ease;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { opacity: 0.82; }
.btn--ghost {
  background: transparent;
  color: var(--color-black-88);
  border-color: var(--color-tan);
}
.btn--gold { background: var(--color-gold); border-color: var(--color-gold); }

/* ---------- Flashcard ---------- */
.deck-status {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-tan);
  margin-bottom: 14px;
}
.flash-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}
.flashcard {
  width: 100%;
  max-width: 560px;
  height: 300px;
  perspective: 1400px;
  cursor: pointer;
}
.flashcard__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform .5s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d;
}
.flashcard.is-flipped .flashcard__inner { transform: rotateY(180deg); }
.flashcard__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 6px;
  border: 1px solid var(--color-light-tan);
  background: var(--card);
  box-shadow: 0 20px 44px -22px var(--color-black-63);
  padding: 30px 34px;
  display: flex;
  flex-direction: column;
}
.flashcard__face::before {
  content: '';
  position: absolute;
  top: 20px; left: 20px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: inset 0 0 0 1.5px var(--color-tan);
}
.flashcard__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-tan);
  padding-left: 32px;
  margin-bottom: auto;
}
.flashcard__body {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex: 1;
  padding: 10px 0;
}
.flashcard__term {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: var(--color-black);
}
.flashcard__def {
  font-family: var(--font-body);
  font-size: 1.08rem;
  color: var(--color-black-88);
}
.flashcard__face--back { transform: rotateY(180deg); border-color: var(--color-gold); }
.flashcard__hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-tan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.flash-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}
.flash-controls .btn-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-tan);
  background: var(--color-white);
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--color-dark-tan);
}
.flash-controls .btn-icon:hover { background: var(--color-black); color: var(--color-white); border-color: var(--color-black); }

/* ---------- List view ---------- */
.term-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.term-list li {
  background: var(--card);
  border: 1px solid var(--color-light-tan);
  border-left: 4px solid var(--color-gold);
  border-radius: 3px;
  padding: 16px 20px;
}
.term-list dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--color-black);
}
.term-list dd {
  margin: 6px 0 0;
  color: var(--color-black-80);
}

.empty-state {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-tan);
  padding: 30px 0;
}

/* ---------- Test page ---------- */
.test-intro {
  background: var(--card);
  border: 1px solid var(--color-light-tan);
  border-radius: 4px;
  padding: 24px 26px;
  margin-bottom: 30px;
}
.test-intro__meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-tan);
  margin-bottom: 10px;
}
.question {
  background: var(--card);
  border: 1px solid var(--color-light-tan);
  border-radius: 4px;
  padding: 22px 24px;
  margin-bottom: 16px;
}
.question__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-tan);
  letter-spacing: 0.08em;
}
.question__term {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 4px 0 16px;
}
.options { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.option {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--color-light-tan);
  border-radius: 3px;
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
}
.option:hover { border-color: var(--color-gold); }
.option input { margin-top: 3px; accent-color: var(--color-gold); }
.option.is-correct { border-color: #4a7a4a; background: rgba(74,122,74,0.08); }
.option.is-incorrect { border-color: #a24b41; background: rgba(162,75,65,0.08); }

.question.is-graded .option { cursor: default; }
.result-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 2px;
  margin-left: auto;
}
.result-tag--correct { background: #4a7a4a; color: white; }
.result-tag--incorrect { background: #a24b41; color: white; }

.test-actions {
  position: sticky;
  bottom: 0;
  background: linear-gradient(to top, var(--paper) 60%, transparent);
  padding: 20px 0 10px;
  display: flex;
  gap: 14px;
  align-items: center;
}
.progress-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-tan);
}

/* ---------- Score panel ---------- */
.score-panel {
  background: var(--color-black);
  color: var(--color-white);
  border-radius: 6px;
  padding: 32px 30px;
  margin-bottom: 30px;
  display: flex;
  gap: 34px;
  align-items: center;
  flex-wrap: wrap;
}
.score-ring {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: conic-gradient(var(--color-gold) calc(var(--pct) * 1%), rgba(255,255,255,0.15) 0);
  flex-shrink: 0;
}
.score-ring__inner {
  width: 100px; height: 100px;
  border-radius: 50%;
  background: var(--color-black);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.score-ring__pct { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; }
.score-ring__label { font-family: var(--font-mono); font-size: 0.6rem; color: var(--color-light-tan); letter-spacing: 0.08em; }
.score-panel h2 { font-family: var(--font-display); margin: 0 0 6px; font-size: 1.7rem; }
.score-panel p { margin: 0; color: var(--color-light-tan); font-family: var(--font-mono); font-size: 0.85rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-light-tan);
  margin-top: 60px;
  padding: 26px 28px 40px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-tan);
  letter-spacing: 0.04em;
}

@media (max-width: 560px) {
  .flashcard { height: 340px; }
  .score-panel { flex-direction: column; text-align: center; }
}