:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --panel-2: #eef1f8;
  --panel-3: #e6ebf5;
  --text: #1c2230;
  --muted: #64708a;
  --border: #d9deea;
  --primary: #2563eb;
  --primary-ink: #ffffff;
  --ok: #16a34a;
  --ok-bg: #e8f7ee;
  --bad: #dc2626;
  --bad-bg: #fdeaea;
  --warn: #b45309;
  --gold: #d97706;
  --shadow: 0 8px 24px rgba(24, 39, 75, .08);
}

html[data-theme="dark"] {
  --bg: #0f131a;
  --panel: #171c26;
  --panel-2: #1e2430;
  --panel-3: #232b39;
  --text: #e7ebf3;
  --muted: #98a3ba;
  --border: #2b3342;
  --primary: #5b8cff;
  --primary-ink: #0b1020;
  --ok: #4ade80;
  --ok-bg: #12291d;
  --bad: #f87171;
  --bad-bg: #2a1414;
  --warn: #fbbf24;
  --gold: #fbbf24;
  --shadow: 0 10px 30px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 10px 18px;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo {
  background: var(--primary); color: var(--primary-ink);
  border-radius: 8px; padding: 4px 8px; font-size: 13px; letter-spacing: .5px;
}
.brand-title { font-size: 15.5px; }
.topbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.icon-btn {
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; width: 38px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
}
.icon-btn:hover { border-color: var(--primary); }

/* Segmented */
.segmented { display: flex; flex-wrap: wrap; gap: 6px; }
.segmented button {
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  padding: 7px 13px; border-radius: 999px; cursor: pointer; font-size: 13.5px;
}
.segmented.sm button { padding: 5px 11px; font-size: 13px; }
.segmented button.active { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }

/* Tabs */
.tabs {
  display: flex; gap: 4px; padding: 0 18px; background: var(--panel);
  border-bottom: 1px solid var(--border); position: sticky; top: 53px; z-index: 25;
  overflow-x: auto;
}
.tabs button {
  background: none; border: 0; color: var(--muted); cursor: pointer;
  padding: 12px 14px; font-size: 14.5px; border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* Layout */
.wrap { max-width: 1100px; margin: 0 auto; padding: 20px 16px 80px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
h1 { margin: 0 0 10px; font-size: 24px; }
h2 { margin: 0 0 8px; font-size: 18px; }

/* Hero */
.hero { margin-bottom: 16px; }
.lead { color: var(--muted); margin: 0 0 14px; max-width: 760px; }
.stats { display: flex; gap: 12px; flex-wrap: wrap; }
.stat {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 18px; min-width: 128px; box-shadow: var(--shadow);
}
.stat .num { font-size: 24px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat .lbl { color: var(--muted); font-size: 12.5px; }

/* Buttons */
button.primary {
  background: var(--primary); color: var(--primary-ink); border: 0;
  padding: 10px 18px; border-radius: 10px; font-weight: 600; cursor: pointer; font-size: 14.5px;
}
button.ghost {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  padding: 9px 15px; border-radius: 10px; cursor: pointer; font-size: 14px;
}
button.ghost:hover { border-color: var(--primary); }
button.ghost.sm, button.primary.sm { padding: 6px 12px; font-size: 13px; }
button.primary:disabled { opacity: .5; cursor: not-allowed; }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 12px; }

/* Pantalla de inicio */
.screen-start { max-width: 900px; margin: 0 auto; padding: 40px 18px; }
.start-head { text-align: center; margin-bottom: 26px; }
.start-head h1 { font-size: 28px; }
.start-head .lead { margin: 0 auto; }
.start-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 720px) { .start-grid { grid-template-columns: 1fr; } }
.start-opt {
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  text-align: left; cursor: pointer; padding: 26px 24px;
  background: var(--panel); border: 2px solid var(--border); border-radius: 16px;
  box-shadow: var(--shadow); color: var(--text); transition: border-color .15s, transform .15s;
}
.start-opt:hover { border-color: var(--primary); transform: translateY(-2px); }
.start-opt .so-ico { font-size: 34px; }
.start-opt .so-title { font-size: 22px; font-weight: 800; }
.start-opt .so-desc { color: var(--muted); font-size: 14px; }
.start-opt .so-meta { margin-top: 6px; font-size: 12.5px; color: var(--primary); font-weight: 600; }

/* Figuras */
.fig { width: 100%; max-width: 100%; border-radius: 8px; display: block; margin: 10px 0; background: #fff; }
.opt-fig { max-width: 100%; border-radius: 6px; display: block; margin-top: 6px; background: #fff; }
.contexto .fig { margin-top: 8px; }

/* Revisor de respuestas ambiguas */
.cands { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.cand {
  display: flex; gap: 10px; align-items: flex-start;
  border: 1px solid var(--border); background: var(--panel-2);
  border-radius: 10px; padding: 10px 12px; cursor: pointer;
}
.cand.sel { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 10%, var(--panel)); }
.cand input { margin-top: 4px; flex: 0 0 auto; }
.cand-body { display: flex; flex-direction: column; gap: 4px; }
.cand-meta { font-size: 12px; color: var(--muted); display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.cand-text { font-size: 14.5px; }
.excl { display: flex; gap: 8px; align-items: center; margin-top: 12px; font-size: 13.5px; color: var(--muted); cursor: pointer; }
.qexcl { opacity: .55; }
.qexcl .cands { opacity: .6; }
.aviso {
  background: var(--bad-bg); border: 1px solid var(--bad); color: var(--text);
  border-radius: 10px; padding: 10px 12px; font-size: 13.5px; margin: 0 0 14px;
}

/* Legal list */
.legal-list { display: flex; flex-direction: column; gap: 8px; }
.norm {
  border: 1px solid var(--border); border-radius: 12px; background: var(--panel-2);
  overflow: hidden;
}
.norm-head {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px; cursor: pointer;
}
.norm-rank {
  flex: 0 0 34px; height: 34px; border-radius: 9px; display: inline-flex;
  align-items: center; justify-content: center; font-weight: 800;
  background: var(--panel); border: 1px solid var(--border);
}
.norm.rank-1 .norm-rank { background: var(--gold); color: #fff; border-color: var(--gold); }
.norm.rank-2 .norm-rank { background: #94a3b8; color: #fff; }
.norm.rank-3 .norm-rank { background: #b45309; color: #fff; }
.norm-name { flex: 1 1 auto; font-weight: 600; font-size: 14.5px; }
.norm-metrics { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.metric { text-align: right; min-width: 62px; }
.metric .mn { font-weight: 800; font-size: 15px; font-variant-numeric: tabular-nums; }
.metric .ml { font-size: 11px; color: var(--muted); }
.cov { font-size: 12px; color: var(--muted); }
.bar { height: 5px; border-radius: 4px; background: var(--panel-3); overflow: hidden; width: 90px; }
.bar > span { display: block; height: 100%; background: var(--primary); }
.chev { transition: transform .15s; color: var(--muted); }
.norm.open .chev { transform: rotate(90deg); }
.norm-body { padding: 0 14px 14px 60px; }
.norm-body.hidden { display: none; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.chip {
  background: var(--panel); border: 1px solid var(--border); border-radius: 999px;
  padding: 3px 10px; font-size: 12.5px; color: var(--text);
}
.chip b { color: var(--primary); }
.link-btn {
  background: none; border: 0; color: var(--primary); cursor: pointer;
  font-size: 13.5px; padding: 4px 0; font-weight: 600;
}

/* Toolbar */
.toolbar { position: sticky; top: 100px; z-index: 10; transition: transform .28s ease, opacity .28s ease; }
.toolbar.is-hidden { transform: translateY(-140%); opacity: 0; pointer-events: none; }

.toolbar-restore {
  position: fixed; right: 20px; bottom: 22px; z-index: 40;
  background: var(--primary); color: var(--primary-ink); border: 0;
  padding: 11px 18px; border-radius: 999px; font-weight: 700; cursor: pointer;
  font-size: 14px; box-shadow: 0 10px 24px rgba(37, 99, 235, .35);
}
.toolbar-restore:hover { filter: brightness(1.05); }
.toolbar-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
.toolbar-row:last-child { margin-bottom: 0; }
.toolbar .search { flex: 1 1 280px; }
.filters { gap: 14px; }
.filt { display: flex; flex-direction: column; font-size: 12px; color: var(--muted); gap: 4px; }
.search, select {
  padding: 9px 11px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); font-size: 14px; width: 100%;
}
select { min-width: 150px; }

/* Preguntas */
.preguntas-list { display: flex; flex-direction: column; gap: 12px; }
.qcard {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px 16px 14px; box-shadow: var(--shadow);
}
.qcard-head { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 8px; }
.qnum {
  flex: 0 0 auto; font-size: 12px; font-weight: 700; color: var(--muted);
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 3px 8px; font-variant-numeric: tabular-nums;
}
.badges { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.badge-freq {
  font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 999px;
  background: var(--primary); color: var(--primary-ink);
}
.badge-freq.hot { background: var(--bad); }
.badge-ex { font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }
.badge-grp { font-size: 11.5px; padding: 3px 9px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }

.qtext { font-size: 15.5px; margin: 4px 0 10px; white-space: pre-wrap; }
.contexto {
  background: var(--panel-2); border: 1px dashed var(--border); border-radius: 10px;
  padding: 10px 12px; font-size: 13.5px; color: var(--muted); margin-bottom: 10px;
  white-space: pre-wrap;
}
.contexto .ct { font-weight: 700; color: var(--text); display: block; margin-bottom: 4px; font-size: 12px; }

.opts { display: flex; flex-direction: column; gap: 7px; }
.opt {
  display: flex; gap: 10px; align-items: flex-start;
  border: 1px solid var(--border); background: var(--panel-2);
  border-radius: 10px; padding: 9px 12px; font-size: 14.5px;
  cursor: pointer;
}
.opt:hover { border-color: var(--primary); }
.opt.locked { cursor: default; }
.opt .letter {
  flex: 0 0 22px; height: 22px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--panel); border: 1px solid var(--border); font-weight: 700; font-size: 12.5px;
}
.opt.correct { border-color: var(--border); }
.qcard.reveal .opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.qcard.reveal .opt.correct .letter { background: var(--ok); color: #fff; border-color: var(--ok); }
.qcard.reveal .opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.qcard.reveal .opt.wrong .letter { background: var(--bad); color: #fff; border-color: var(--bad); }
.correcta-badge { display: none; }
.qcard.reveal .correcta-badge { display: inline-block; background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.opt .opt-text { flex: 1 1 auto; }
.fb { margin-top: 10px; padding: 9px 12px; border-radius: 10px; font-size: 14px; font-weight: 600; }
.fb.ok { background: var(--ok-bg); border: 1px solid var(--ok); color: var(--ok); }
.fb.bad { background: var(--bad-bg); border: 1px solid var(--bad); color: var(--bad); }

.qmeta { margin-top: 10px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ref {
  margin-top: 10px; font-size: 13px; color: var(--muted);
  border-left: 3px solid var(--primary); padding-left: 10px;
  background: var(--panel-2); border-radius: 0 8px 8px 0; padding: 8px 10px;
}
.ref b { color: var(--text); }
.tag-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.tag { font-size: 12px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 2px 8px; color: var(--text); }
.tag.norma { border-color: var(--primary); color: var(--primary); }

.load-more { text-align: center; padding: 16px 0; }

/* Guía */
.guia { padding-left: 20px; }
.guia li { margin-bottom: 10px; }

.foot { text-align: center; color: var(--muted); font-size: 12.5px; padding: 18px; }

/* Print */
.print-only { display: none; }
@media print {
  .no-print, .topbar, .tabs, .foot { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border-color: #ccc; page-break-inside: avoid; }
  .print-only { display: block !important; }
  .norm, .qcard { break-inside: avoid; }
  #preguntas-list .qcard { border: 1px solid #ccc; box-shadow: none; }
  a[href]::after { content: ""; }
}

@media (max-width: 720px) {
  .norm-metrics { display: none; }
  .norm.open .norm-body { padding-left: 14px; }
  .toolbar { position: static; }
  .tabs { top: 0; }
}