:root {
  --bg: #fff6ec;
  --bg-2: #ffe9d6;
  --surface: #ffffff;
  --surface-2: #fff1e2;
  --text: #3a2418;
  --muted: #8b6a58;
  --border: #f6d6bd;
  --accent: #ff6f4d;
  --accent-2: #ffb02e;
  --accent-3: #2ab8a6;
  --accent-4: #8e5cf6;
  --accent-soft: #ffe1d6;
  --accent-ink: #ffffff;
  --heading: #d8452b;
  --ok: #1f9d63;
  --ok-soft: #dcf5e6;
  --bad: #e2453a;
  --bad-soft: #ffe1dd;
  --warn: #c47a00;
  --warn-soft: #fff0c8;
  --term: #b8410e;
  --shadow: 0 10px 30px rgba(255, 111, 77, 0.14);
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #23160f;
    --bg-2: #2d1d13;
    --surface: #2f2017;
    --surface-2: #3a281c;
    --text: #fbeadb;
    --muted: #c9a48e;
    --border: #533a2a;
    --accent: #ff8a66;
    --accent-2: #ffc457;
    --accent-3: #4fd3c1;
    --accent-4: #b39cff;
    --accent-soft: #4a2e22;
    --accent-ink: #2a1208;
    --heading: #ffb39a;
    --ok: #62d69a;
    --ok-soft: #1f3f2e;
    --bad: #ff8b80;
    --bad-soft: #4a2622;
    --warn: #ffcf6e;
    --warn-soft: #4a3a18;
    --term: #ffb08a;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  }
}
:root[data-theme="dark"] {
  --bg: #23160f;
  --bg-2: #2d1d13;
  --surface: #2f2017;
  --surface-2: #3a281c;
  --text: #fbeadb;
  --muted: #c9a48e;
  --border: #533a2a;
  --accent: #ff8a66;
  --accent-2: #ffc457;
  --accent-3: #4fd3c1;
  --accent-4: #b39cff;
  --accent-soft: #4a2e22;
  --accent-ink: #2a1208;
  --heading: #ffb39a;
  --ok: #62d69a;
  --ok-soft: #1f3f2e;
  --bad: #ff8b80;
  --bad-soft: #4a2622;
  --warn: #ffcf6e;
  --warn-soft: #4a3a18;
  --term: #ffb08a;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(900px 500px at -10% -10%, var(--bg-2) 0%, transparent 60%),
    radial-gradient(700px 400px at 110% 10%, rgba(42, 184, 166, 0.16) 0%, transparent 60%),
    radial-gradient(600px 400px at 50% 110%, rgba(142, 92, 246, 0.14) 0%, transparent 60%);
  background-attachment: fixed;
  color: var(--text);
  font: 16px/1.55 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--term); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; color: var(--heading); }
h1 { font-size: 1.7rem; letter-spacing: -0.01em; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 0.9em; }
button { font: inherit; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 4px solid transparent;
  border-image: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent-4)) 1;
}
.brand { font-weight: 800; text-decoration: none; color: var(--heading); white-space: nowrap; display: flex; align-items: center; gap: 8px; }
.brand-dot { width: 14px; height: 14px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent-2)); display: inline-block; }
.topnav { display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.topnav a, .linkbtn {
  color: var(--text); text-decoration: none; padding: 6px 10px; border-radius: 999px;
  background: none; border: 0; cursor: pointer; font-size: 0.95rem; font-weight: 600;
}
.topnav a:hover, .linkbtn:hover { background: var(--accent-soft); color: var(--heading); }
@media (max-width: 560px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .topnav { justify-content: flex-start; }
}

.app { max-width: 860px; margin: 0 auto; padding: 22px 16px 120px; }
.loading { text-align: center; color: var(--muted); padding: 60px 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card.tight { padding: 14px 16px; }
.card.exam-card { border-top: 6px solid var(--accent); }
.card.exam-card:nth-child(2) { border-top-color: var(--accent-3); }
.card.exam-card:nth-child(3) { border-top-color: var(--accent-4); }
.card.tone-teal { border-top: 6px solid var(--accent-3); }
.card.tone-amber { border-top: 6px solid var(--accent-2); }
.card.tone-violet { border-top: 6px solid var(--accent-4); }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.spread { justify-content: space-between; }

.hero { margin-bottom: 18px; }
.hero h1 { font-size: 2rem; }
.hero p { font-size: 1.05rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: 999px; border: 2px solid var(--border);
  background: var(--surface-2); color: var(--text); cursor: pointer; text-decoration: none;
  min-height: 42px; font-weight: 600; transition: transform 0.08s ease, filter 0.1s ease;
}
.btn:hover { filter: brightness(0.97); transform: translateY(-1px); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent; box-shadow: 0 6px 16px rgba(255, 111, 77, 0.3); }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn.sm { padding: 6px 12px; min-height: 34px; font-size: 0.9rem; }

.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.8rem; font-weight: 600;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border);
}
.badge.ok { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.badge.bad { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.badge.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.badge.topic { background: var(--accent-soft); color: var(--term); border-color: transparent; }

.progress { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin: 8px 0 14px; border: 1px solid var(--border); }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3)); transition: width 0.25s; }

.exam-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--heading); }
.timer.low { color: var(--bad); }

.qtext { font-size: 1.1rem; margin-bottom: 14px; }
.options { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.opt {
  display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start;
  width: 100%; text-align: left; padding: 12px 14px;
  border: 2px solid var(--border); border-radius: 14px; background: var(--surface);
  color: var(--text); cursor: pointer; transition: transform 0.08s ease, border-color 0.1s ease;
}
.opt:hover { border-color: var(--accent); transform: translateY(-1px); }
.opt .letter {
  width: 30px; height: 30px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--term); font-weight: 800; font-size: 0.9rem;
}
.opt.selected { border-color: var(--accent); background: var(--accent-soft); }
.opt.correct { border-color: var(--ok); background: var(--ok-soft); animation: pop 0.35s ease; }
.opt.correct .letter { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); animation: shake 0.3s ease; }
.opt.wrong .letter { background: var(--bad); color: #fff; }
.opt:disabled { cursor: default; transform: none; }
.opt:disabled:hover { border-color: inherit; }
@keyframes pop { 0% { transform: scale(0.98); } 50% { transform: scale(1.02); } 100% { transform: scale(1); } }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
@media (prefers-reduced-motion: reduce) { .opt.correct, .opt.wrong { animation: none; } .btn:hover, .opt:hover { transform: none; } }

.feedback { margin-top: 14px; padding: 14px 16px; border-radius: 14px; border-left: 6px solid var(--border); background: var(--surface-2); }
.feedback.ok { border-left-color: var(--ok); background: var(--ok-soft); }
.feedback.bad { border-left-color: var(--bad); }
.feedback .verdict { font-weight: 800; margin-bottom: 6px; }
.feedback.ok .verdict { color: var(--ok); }
.feedback.bad .verdict { color: var(--bad); }
.feedback .ref { color: var(--muted); font-size: 0.9rem; margin: 6px 0 0; }

.navstrip { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.navstrip button {
  min-width: 34px; height: 32px; padding: 0 9px; border-radius: 999px; border: 2px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; font-size: 0.85rem; font-weight: 600;
}
.navstrip button.current { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.navstrip button.answered { background: var(--accent-soft); }
.navstrip button.right { background: var(--ok-soft); border-color: var(--ok); }
.navstrip button.wrong { background: var(--bad-soft); border-color: var(--bad); }
.navstrip button.case { border-style: dashed; border-color: var(--accent-3); }

.scenario { padding: 14px 16px; background: var(--surface-2); border-radius: 14px; margin-bottom: 14px; border-left: 6px solid var(--accent-3); }
.case-q { margin-bottom: 18px; }
.case-q label { display: block; font-weight: 600; margin-bottom: 6px; }
textarea {
  width: 100%; min-height: 150px; padding: 12px; border-radius: 14px; border: 2px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent-3); }
.model { margin-top: 14px; }
.model p { margin-bottom: 0.8em; }
.marks { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.marks label { display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: start; cursor: pointer; padding: 10px 12px; border-radius: 12px; background: var(--surface-2); }
.marks label:has(input:checked) { background: var(--ok-soft); }
.marks input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--ok); }
.score-line { font-weight: 800; margin-top: 10px; color: var(--heading); }

.term {
  color: var(--term); border-bottom: 2px dotted var(--accent-2); cursor: pointer; text-decoration: none;
  background: none; padding: 0; font: inherit; display: inline; font-weight: 600;
}
.term:hover { background: var(--accent-soft); border-radius: 4px; }

.result-big { font-size: 3rem; font-weight: 900; line-height: 1; margin-bottom: 8px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .n { font-size: 1.4rem; font-weight: 800; color: var(--heading); }
.wrong-item { border-top: 1px solid var(--border); padding: 12px 0; }
.wrong-item:first-of-type { border-top: 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.85rem; }

.mode-pick { display: grid; gap: 10px; }
.mode-pick label { display: grid; grid-template-columns: 24px 1fr; gap: 10px; padding: 12px 14px; border: 2px solid var(--border); border-radius: 14px; cursor: pointer; }
.mode-pick label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.mode-pick input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--accent); }
select { padding: 9px 12px; border-radius: 999px; border: 2px solid var(--border); background: var(--surface); color: var(--text); font: inherit; }

/* Vocabulary drawer */
.vocab-fab {
  position: fixed; right: 16px; bottom: 16px; z-index: 30;
  display: flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-radius: 999px; border: 0;
  background: linear-gradient(135deg, var(--accent-3), var(--accent-4)); color: #fff; cursor: pointer; box-shadow: 0 8px 20px rgba(42, 184, 166, 0.35);
  font-weight: 700;
}
.fab-icon { font-size: 0.8rem; font-weight: 900; letter-spacing: 0.5px; background: rgba(255,255,255,0.22); padding: 2px 6px; border-radius: 6px; }
.drawer-backdrop { position: fixed; inset: 0; background: rgba(58, 36, 24, 0.35); z-index: 40; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(440px, 100%);
  background: var(--surface); border-left: 6px solid var(--accent-3); box-shadow: var(--shadow);
  z-index: 50; transform: translateX(100%); transition: transform 0.22s ease;
  display: flex; flex-direction: column; padding: 14px 16px;
}
.drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; }
.drawer-head h2 { color: var(--accent-3); }
.drawer-hint { color: var(--muted); font-size: 0.85rem; margin: 4px 0 10px; }
.iconbtn { border: 0; background: var(--surface-2); width: 36px; height: 36px; border-radius: 50%; font-size: 1.4rem; cursor: pointer; color: var(--text); }
.vocab-search { width: 100%; padding: 10px 14px; border-radius: 999px; border: 2px solid var(--border); background: var(--surface-2); color: var(--text); font: inherit; margin-bottom: 10px; }
.vocab-search:focus { outline: none; border-color: var(--accent-3); }
.drawer-list { overflow-y: auto; flex: 1; padding-right: 4px; }
.vocab-item { padding: 10px 10px; border-bottom: 1px solid var(--border); border-radius: 12px; }
.vocab-item.hit { background: var(--warn-soft); }
.vocab-item .en { font-weight: 800; color: var(--heading); }
.vocab-item .nl { color: var(--accent-3); font-weight: 700; }
.vocab-item .meaning { margin: 4px 0 2px; font-size: 0.95rem; }
.vocab-item .where { color: var(--muted); font-size: 0.8rem; }
@media (max-width: 560px) {
  .fab-label { display: none; }
  .vocab-fab { padding: 14px; }
}

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