:root {
  --bg: #0f1220;
  --panel: #191d2e;
  --panel-2: #21263b;
  --text: #e8eaf2;
  --muted: #a0a6bd;
  --border: #2c3350;
  --accent: #6c8cff;
  --accent-2: #4f6bd6;
  --good: #3ecb8c;
  --good-bg: #12312a;
  --bad: #ff6b7d;
  --bad-bg: #331a22;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 1.15rem; color: var(--text); }
.topbar nav { display: flex; align-items: center; gap: 16px; }
main { max-width: 820px; margin: 0 auto; padding: 24px 20px 60px; }
footer { text-align: center; color: var(--muted); padding: 30px; font-size: .85rem; }

h1 { font-size: 1.7rem; margin: .2em 0 .5em; }
h2 { font-size: 1.2rem; margin: 1.2em 0 .5em; }
.muted, .hint { color: var(--muted); }
.hint { font-size: .85rem; }
.lead { font-size: 1.05rem; }
.meta { color: var(--muted); }

/* flashes */
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; }
.flash.error { background: var(--bad-bg); color: var(--bad); border: 1px solid #5a2733; }
.flash.success { background: var(--good-bg); color: var(--good); border: 1px solid #1f5a45; }

/* buttons */
button, .primary, .secondary {
  font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--border);
  padding: 9px 16px; background: var(--panel-2); color: var(--text);
}
button:hover { border-color: var(--accent); }
.primary { background: var(--accent); border-color: var(--accent); color: #0b0e19; font-weight: 600; }
.primary:hover { background: var(--accent-2); }
.link { background: none; border: none; color: var(--accent); padding: 0; }
.link.danger, .danger { color: var(--bad); }
.inline { display: inline; }
.actions { margin-top: 20px; }

/* hero + quiz list */
.hero { margin-bottom: 20px; }
.quiz-list { list-style: none; padding: 0; display: grid; gap: 12px; }
.quiz-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); }
.quiz-card:hover { border-color: var(--accent); }
.quiz-link { display: block; padding: 16px 18px; color: var(--text); }
.quiz-link:hover { text-decoration: none; }
.quiz-title { display: block; font-weight: 600; font-size: 1.1rem; }
.quiz-meta { display: block; color: var(--muted); font-size: .85rem; margin-top: 2px; }
.quiz-desc { display: block; color: var(--muted); margin-top: 6px; }
.empty { color: var(--muted); }

/* panels & forms */
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.panel.narrow { max-width: 420px; margin: 40px auto; }
.back { display: inline-block; margin-bottom: 10px; color: var(--muted); }
label { display: block; margin: 14px 0; font-weight: 500; }
input[type=text], input[type=password], textarea, input[type=file] {
  width: 100%; margin-top: 6px; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text); font: inherit;
}
textarea { resize: vertical; }
.sample { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; overflow-x: auto; font-size: .82rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* question builder */
.question-block { border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin: 16px 0; background: var(--panel-2); }
.question-block legend { font-weight: 600; padding: 0 6px; display: flex; gap: 10px; align-items: center; }
.answers { display: grid; gap: 8px; }
.answer { display: flex; align-items: center; gap: 8px; margin: 0; }
.answer input[type=radio] { margin-top: 6px; }
.answer input[type=text] { margin-top: 0; }

/* mode choice */
.mode-choice { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 12px 0; }
.mode-card { display: block; padding: 18px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); }
.mode-card:hover { border-color: var(--accent); text-decoration: none; }
.mode-card strong { display: block; font-size: 1.1rem; margin-bottom: 4px; }
.mode-card span { color: var(--muted); font-size: .9rem; }
.mode-card.primary { background: var(--panel-2); }
.mode-card.primary strong { color: var(--accent); }
.editor-actions { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border);
  display: flex; gap: 18px; align-items: center; }

/* taking a quiz */
.progress-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.timer { color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.progress { color: var(--muted); margin-bottom: 6px; font-size: .9rem; }
.bar { height: 8px; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 999px; overflow: hidden; margin-bottom: 18px; }
.bar-fill { height: 100%; width: 0; background: var(--accent);
  border-radius: 999px; transition: width .25s ease; }
.shuffle-toggle { display: flex; align-items: center; gap: 8px; margin: 4px 0 8px;
  font-weight: 500; cursor: pointer; }
.shuffle-toggle input { width: auto; margin: 0; }
.qcard { }
.qtext { font-size: 1.3rem; margin-bottom: 16px; }
.answer-options { display: grid; gap: 10px; }
.option { text-align: left; padding: 14px 16px; font-size: 1rem; }
.option.selected { border-color: var(--accent); background: #232a44; }
.option.correct { background: var(--good-bg); border-color: var(--good); color: var(--good); }
.option.incorrect { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); }
.qfooter { margin-top: 18px; }
.nav-row { display: flex; gap: 10px; flex-wrap: wrap; }
.nav-row .primary { margin-left: auto; }

/* flashcard */
.flashcard { cursor: pointer; min-height: 180px; user-select: none; }
.flashcard .qtext { text-align: center; margin-bottom: 18px; }
.flash-body { text-align: center; }
.flash-answer { font-size: 1.5rem; font-weight: 700; color: var(--accent);
  padding: 12px 0; }
.flashcard .why { text-align: center; }
.flip-hint { text-align: center; color: var(--muted); font-size: .85rem;
  margin-top: 14px; font-style: italic; }
.feedback { padding: 14px 16px; border-radius: 8px; margin-bottom: 14px; }
.feedback.good { background: var(--good-bg); border: 1px solid #1f5a45; }
.feedback.bad { background: var(--bad-bg); border: 1px solid #5a2733; }
.verdict { font-weight: 700; margin: 0 0 6px; }
.why { color: var(--muted); margin: 6px 0 0; }
.next-btn { margin-top: 4px; }

/* results */
.results-summary { text-align: center; padding: 20px; background: var(--panel-2);
  border-radius: var(--radius); margin-bottom: 18px; }
.result-item { padding: 14px 16px; border-radius: 8px; margin-bottom: 10px; border: 1px solid var(--border); }
.result-item.good { background: var(--good-bg); border-color: #1f5a45; }
.result-item.bad { background: var(--bad-bg); border-color: #5a2733; }
.rq { font-weight: 600; margin: 0 0 6px; }
.correct-line { color: var(--good); }
.btn-link { display: inline-block; margin-top: 12px; padding: 10px 16px; }

/* history / badges / resume */
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.badge { font-size: .72rem; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); }
.badge.done { background: var(--good-bg); color: var(--good); border-color: #1f5a45; }
.badge.progress { background: #2a2340; color: #c3b6ff; border-color: #453a6b; }
.badge.muted-badge { color: var(--muted); }

.resume-box { display: flex; align-items: center; justify-content: space-between; gap: 12px;
  flex-wrap: wrap; background: #2a2340; border: 1px solid #453a6b; border-radius: var(--radius);
  padding: 12px 16px; margin: 8px 0 20px; }
.resume-box .btn-link { margin: 0; padding: 8px 16px; }

.history { width: 100%; border-collapse: collapse; margin-top: 8px; }
.history th, .history td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.history th { color: var(--muted); font-weight: 600; font-size: .85rem; }
.history tbody tr:hover { background: var(--panel-2); }
.results-actions { margin-top: 16px; }

.mode-choice-3 { grid-template-columns: 1fr 1fr 1fr; }
.banner-practice { background: #2a2340; border: 1px solid #453a6b; color: #c3b6ff;
  padding: 8px 12px; border-radius: 8px; display: inline-block; }
.history td a { white-space: nowrap; }

/* field reference table (upload page) */
.fielddoc { width: 100%; border-collapse: collapse; margin: 8px 0 20px; font-size: .9rem; }
.fielddoc th, .fielddoc td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.fielddoc th { color: var(--muted); font-weight: 600; }
.fielddoc td:nth-child(2) { color: var(--accent); white-space: nowrap; font-size: .82rem; }
.fielddoc td.opt { color: var(--muted); }
.fielddoc code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }
.option:disabled { cursor: default; opacity: 1; }

@media (max-width: 720px) { .mode-choice-3 { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .mode-choice { grid-template-columns: 1fr; } }