:root {
  --bg: #dccfdc;
  --surface: #ffffff;
  --ink: #141210;
  --muted: #6b6257;
  --line: #141210;
  --accent: #2b44ff;
  --accent-soft: #e2e6ff;
  --accent2: #ff5a3c;
  --highlight: #ffd23f;
  --known: #b9f2cd;
  --known-ink: #0b7a38;
  --shadow-sm: 2px 2px 0 var(--ink);
  --shadow: 4px 4px 0 var(--ink);
  --shadow-lg: 6px 6px 0 var(--ink);
  --radius: 12px;
  --maxw: 1040px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14120d;
    --surface: #201d17;
    --ink: #f4efe4;
    --muted: #a89e8d;
    --line: #f4efe4;
    --accent: #8a97ff;
    --accent-soft: #2a2740;
    --accent2: #ff7a5c;
    --highlight: #6b5712;
    --known: #14361f;
    --known-ink: #7fe0a0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; font-weight: 600; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header / nav */
.site-header {
  border-bottom: 3px solid var(--ink);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  font-family: system-ui, sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -.02em;
  text-transform: uppercase;
  color: var(--ink);
}
.brand span { color: var(--accent2); }
.nav a {
  margin-left: 18px;
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: .95rem;
  font-weight: 600;
}
.nav a:hover { color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--ink); text-decoration: underline; text-decoration-color: var(--accent2); text-decoration-thickness: 3px; text-underline-offset: 4px; }

/* Global French/Spanish switch in the header — a segmented pill. */
.site-header .wrap { flex-wrap: wrap; gap: 10px 14px; }
.lang-switch {
  display: inline-flex;
  border: 2px solid var(--ink);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.lang-btn {
  border: 0;
  background: transparent;
  font-family: system-ui, sans-serif;
  font-size: .85rem;
  font-weight: 800;
  letter-spacing: -.01em;
  padding: 5px 15px;
  color: var(--muted);
  cursor: pointer;
}
.lang-btn + .lang-btn { border-left: 2px solid var(--ink); }
.lang-btn:hover { color: var(--ink); }
.lang-btn.on { background: var(--accent); color: #fff; }

main { padding: 34px 0 80px; }

h1 {
  font-family: system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -.03em;
  line-height: 1.02;
  margin: 0 0 8px;
}
.subtitle { color: var(--muted); margin: 0 0 28px; font-size: 1.08rem; }

/* Library cards */
.section-label {
  font-family: system-ui, sans-serif;
  text-transform: uppercase;
  letter-spacing: .1em;
  font-size: .8rem;
  font-weight: 800;
  color: var(--ink);
  margin: 32px 0 14px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}
.card {
  display: block;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  transition: transform .1s ease, box-shadow .1s ease;
}
.card:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow-lg); text-decoration: none; }
.card .lang-tag {
  font-family: system-ui, sans-serif;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #fff;
  background: var(--accent2);
  border: 2px solid var(--ink);
  padding: 2px 9px;
  border-radius: 999px;
}
.card h3 { font-family: system-ui, sans-serif; margin: 12px 0 4px; font-size: 1.25rem; font-weight: 800; letter-spacing: -.01em; }
.card .meta { color: var(--muted); font-size: .9rem; font-family: system-ui, sans-serif; font-weight: 600; }

/* Toolbar (reader + vocab) */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 22px;
  font-family: system-ui, sans-serif;
  font-size: .92rem;
  box-shadow: var(--shadow);
}
.toolbar label { color: var(--muted); font-weight: 600; }
.toolbar select, .toolbar input[type="search"], .btn {
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 7px 11px;
}
.toolbar input[type="search"] { min-width: 200px; }
.btn { cursor: pointer; box-shadow: var(--shadow-sm); transition: transform .08s ease, box-shadow .08s ease; }
.btn:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 0 0 0 var(--ink); }
.btn.on { background: var(--accent); color: #fff; }
.spacer { flex: 1 1 auto; }

/* Parallel reader */
.text-head { margin-bottom: 8px; }
.text-head .meta { color: var(--muted); font-family: system-ui, sans-serif; font-size: .9rem; font-weight: 600; }

.parallel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 28px;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 8px 10px;
  box-shadow: var(--shadow);
}
.col-head {
  font-family: system-ui, sans-serif;
  font-size: .74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink);
  padding: 10px 14px 6px;
  border-bottom: 2px solid var(--ink);
  position: sticky;
  top: 66px;
  background: var(--surface);
}
.sent {
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.12rem;
  transition: background .1s ease;
}
.sent.en { color: var(--muted); }
.parallel.swap .sent.en { color: var(--ink); }
.parallel.swap .sent.target { color: var(--muted); }
.sent:hover { background: var(--accent-soft); }
.sent.active { background: var(--highlight); color: #141210; box-shadow: inset 0 0 0 2px var(--ink); }

/* Clickable words (target column) */
.sent.target .tok { cursor: pointer; border-radius: 3px; padding: 0 1px; }
.sent.target .tok:hover { background: var(--accent-soft); box-shadow: inset 0 -3px 0 var(--accent); }
.sent.target .tok.sel { background: var(--highlight); color: #141210; box-shadow: inset 0 -3px 0 var(--accent2); }

/* Word-translation popover */
.wordpop {
  position: absolute;
  z-index: 50;
  max-width: 260px;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: 10px;
  padding: 10px 13px;
  box-shadow: var(--shadow);
  font-family: system-ui, sans-serif;
}
.wp-word { font-weight: 800; color: var(--accent); font-size: 1.05rem; }
.wp-gloss { color: var(--ink); font-size: .95rem; margin-top: 2px; font-weight: 600; }
.wp-gloss.none { color: var(--muted); font-style: italic; font-weight: 500; }

/* Self-test: hide english column */
.parallel.hide-en .sent.en,
.parallel.hide-en .col-head.en-head { visibility: hidden; }

/* Font-size steps applied to the whole reader */
.parallel.fs-s .sent { font-size: 1rem; }
.parallel.fs-l .sent { font-size: 1.3rem; }

/* Category chip bar */
.chipbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.chip {
  font-family: system-ui, sans-serif;
  font-size: .9rem;
  font-weight: 700;
  padding: 7px 14px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: transform .08s ease, box-shadow .08s ease, background .08s ease;
}
.chip:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.chip:active { transform: translate(2px, 2px); box-shadow: 0 0 0 var(--ink); }
.chip.on { background: var(--accent); color: #fff; }
.chip-sep { width: 2px; align-self: stretch; background: var(--ink); margin: 2px 4px; }

/* Vocab */
.vocab-stats {
  font-family: system-ui, sans-serif;
  color: var(--muted);
  font-size: .92rem;
  font-weight: 600;
  margin: 0 0 14px;
}
table.vocab {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
table.vocab th, table.vocab td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 2px solid var(--ink);
}
table.vocab th {
  font-family: system-ui, sans-serif;
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: #fff;
  background: var(--ink);
}
table.vocab tr:last-child td { border-bottom: none; }
table.vocab .rank { color: var(--muted); width: 48px; font-family: system-ui, sans-serif; font-size: .9rem; font-weight: 700; }
table.vocab .word { font-weight: 800; font-size: 1.1rem; }
table.vocab .pos { color: var(--muted); font-family: system-ui, sans-serif; font-size: .82rem; font-style: italic; }
/* Lean view (thematic categories) hides the rank + type columns */
table.vocab.lean th.col-rank, table.vocab.lean td.rank,
table.vocab.lean th.col-type, table.vocab.lean td.pos { display: none; }

table.vocab tr.known { background: var(--known); }
table.vocab tr.known .word { color: var(--known-ink); }
.know-btn {
  cursor: pointer;
  border: 2px solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  border-radius: 999px;
  width: 28px; height: 28px;
  font-size: .9rem;
  font-weight: 800;
  line-height: 1;
}
.know-btn:hover { background: var(--accent-soft); }
tr.known .know-btn { background: var(--known-ink); color: #fff; border-color: var(--ink); }

.empty { color: var(--muted); font-family: system-ui, sans-serif; padding: 40px; text-align: center; font-weight: 600; }

/* ---- Flashcards ---- */
.hidden { display: none; }
.fc-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 14px 0;
  font-family: system-ui, sans-serif;
  font-size: .95rem;
  font-weight: 600;
}
.fc-row label { color: var(--muted); }
.fc-row select { font: inherit; font-weight: 600; color: var(--ink); background: var(--surface); border: 2px solid var(--ink); border-radius: 8px; padding: 7px 11px; }
.fc-hint { color: var(--muted); font-family: system-ui, sans-serif; font-size: .88rem; font-weight: 600; }
.fc-center { text-align: center; }
.btn-start { font-size: 1.05rem; padding: 12px 28px; font-weight: 800; background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-start:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow-lg); }
.btn-quiet { color: var(--muted); background: transparent; border-color: var(--muted); box-shadow: none; }
.btn-quiet:hover { box-shadow: none; transform: none; color: var(--ink); border-color: var(--ink); }

.fc-progress { text-align: center; color: var(--muted); font-family: system-ui, sans-serif; font-size: .92rem; font-weight: 700; margin: 6px 0 16px; }

.card3d { perspective: 1200px; margin: 8px auto 0; max-width: 520px; }
.card-inner {
  position: relative;
  width: 100%;
  min-height: 240px;
  transition: transform .45s cubic-bezier(.4,.2,.2,1);
  transform-style: preserve-3d;
  cursor: pointer;
}
.card3d.flipped .card-inner { transform: rotateY(180deg); }
.card3d .face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 28px;
  text-align: center;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: 16px;
  box-shadow: var(--shadow);
  backface-visibility: hidden;
}
.card3d .face.back { transform: rotateY(180deg); background: var(--accent); }
.card3d .lbl {
  font-family: system-ui, sans-serif;
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
}
.card3d .term { font-family: system-ui, sans-serif; font-size: 2.2rem; font-weight: 800; line-height: 1.2; letter-spacing: -.02em; }
.card3d .face.back .lbl { color: rgba(255,255,255,.85); }
.card3d .face.back .term { color: #fff; }

.fc-controls { display: flex; gap: 14px; justify-content: center; margin: 22px 0 10px; }
.fc-controls .btn { font-size: 1rem; font-weight: 700; padding: 12px 26px; box-shadow: var(--shadow); }
.fc-controls .btn:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow-lg); }
.fc-controls .btn:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.btn-again { background: var(--surface); }
.btn-got { background: var(--known-ink); color: #fff; }

kbd {
  font-family: ui-monospace, Menlo, monospace;
  font-size: .8em;
  font-weight: 700;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: 5px;
  padding: 1px 6px;
  box-shadow: 1px 1px 0 var(--ink);
}

.fc-done-card { text-align: center; padding: 40px 20px; }
.fc-done-emoji { font-size: 3rem; }
.fc-done-text { font-size: 1.25rem; font-weight: 600; margin: 12px 0 22px; }

footer {
  border-top: 3px solid var(--ink);
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: .85rem;
  font-weight: 600;
  padding: 22px 0 40px;
}

@media (max-width: 640px) {
  .parallel { grid-template-columns: 1fr; }
  .col-head { position: static; }
  .sent.en { border-left: 2px solid var(--ink); }
}