:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #1d2330;
  --muted: #667085;
  --line: #e3e6ee;
  --accent: #2f5bd3;
  --accent-soft: #e8eefc;
  --ok: #1f8a4c;
  --ok-soft: #e4f5ea;
  --bad: #c53b3b;
  --bad-soft: #fbe9e9;
  --warn: #a86400;
  --warn-soft: #fff3dc;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  .spec, .spec-head { --tint: hsl(var(--h) 35% 22%) !important; --ink: hsl(var(--h) 60% 70%) !important; }
  :root {
    --bg: #12151c; --panel: #1b2029; --text: #e6e9ef; --muted: #9aa3b2; --line: #2c3340;
    --accent: #7ea2ff; --accent-soft: #1f2a44; --ok: #4cc27d; --ok-soft: #173326;
    --bad: #ff7b7b; --bad-soft: #3a1d1d; --warn: #f0b24a; --warn-soft: #3a2c12;
  }
  .fig img, .exhibit img { background: #fff; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
button { font: inherit; cursor: pointer; }
.muted { color: var(--muted); }

.topbar { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 16px;
  padding: 10px 20px; background: var(--panel); border-bottom: 1px solid var(--line); }
.title { font-weight: 600; flex: 1; }
.status { color: var(--muted); font-size: 14px; }
.link { background: none; border: 0; color: var(--accent); padding: 4px 0; }
main { max-width: 980px; margin: 0 auto; padding: 20px 16px 80px; }

/* ---- inicio: materias */
.brand { text-decoration: none; font-size: 20px; }
[hidden] { display: none !important; }
.hero { padding: 18px 0 8px; }
.hero h1 { font-size: 28px; margin: 0 0 4px; letter-spacing: -.01em; }
.hero > p { margin: 0 0 16px; }
.search { display: flex; gap: 8px; margin: 0 0 14px; }
.search input { flex: 1; min-width: 0; font: inherit; padding: 11px 14px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--panel); color: var(--text); }
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.overall { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--muted); margin-bottom: 18px; }
.overall .bar { flex: 0 0 180px; }
.specs { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.spec { --tint: hsl(var(--h) 70% 94%); --ink: hsl(var(--h) 55% 38%);
  display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto auto auto; column-gap: 12px; row-gap: 4px;
  align-items: center; padding: 16px; border-radius: 14px; background: var(--panel); border: 1px solid var(--line);
  color: var(--text); text-decoration: none; transition: transform .12s ease, box-shadow .12s ease, border-color .12s; }
.spec:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(20, 30, 60, .08); border-color: var(--ink); }
.spec .ico { grid-row: 1 / span 2; width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  font-size: 24px; background: var(--tint); }
.spec .name { font-weight: 650; line-height: 1.25; }
.spec .count { font-size: 13px; color: var(--muted); }
.spec .bar { grid-column: 1 / -1; margin-top: 10px; }
.spec .prog { grid-column: 1 / -1; font-size: 12.5px; color: var(--muted); }
.spec.pending { border-style: dashed; }
.spec.pending .ico { background: var(--warn-soft); }
.bar { height: 6px; border-radius: 999px; background: var(--line); overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--ok); border-radius: inherit; }
.bar.big { height: 8px; }
.bar.thin { height: 4px; }

/* ---- materia */
.spec-head { --tint: hsl(var(--h) 70% 94%); display: flex; gap: 16px; align-items: center; padding: 14px 0 6px; }
.spec-head .ico { width: 60px; height: 60px; border-radius: 16px; display: grid; place-items: center; font-size: 32px; background: var(--tint); flex: none; }
.spec-head h1 { margin: 0; font-size: 26px; }
.spec-head p { margin: 2px 0 0; }
.actions-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 16px 0; }
.subs-title { font-size: 17px; margin: 22px 0 10px; }
.subs { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.sub { display: flex; gap: 10px; align-items: center; }
.sub-main { flex: 1; display: grid; grid-template-columns: 1fr auto; row-gap: 8px; align-items: center; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--text); text-decoration: none; }
.sub-main:hover { border-color: var(--accent); }
.sub-main .bar { grid-column: 1 / -1; }
.sname { font-weight: 550; }
.scount { font-size: 13px; color: var(--muted); background: var(--bg); border-radius: 999px; padding: 1px 9px; }
.btn.small { padding: 6px 12px; font-size: 14px; }
.note { background: var(--warn-soft); color: var(--warn); padding: 10px 12px; border-radius: 8px; font-size: 14px; }
.small { font-size: 13px; }
.chip { font-size: 12.5px; color: var(--muted); background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; }

/* ---- búsqueda */
.results-list { list-style: none; padding: 0; margin: 8px 0; display: grid; gap: 8px; }
.results-list a { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--panel); color: var(--text); text-decoration: none; }
.results-list a:hover { border-color: var(--accent); }
.snip { font-size: 14px; }
.btn { border: 1px solid var(--line); background: var(--panel); color: var(--text); padding: 8px 14px;
  border-radius: 8px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:disabled { opacity: .45; cursor: default; }
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; font-weight: 600; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.pending { margin-top: 18px; font-size: 14px; }

/* ---- pregunta */
.qhead { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.qhead .num { font-weight: 700; font-size: 18px; }
.qhead .id { color: var(--muted); font-size: 14px; margin-left: auto; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.stem p, .expl p { margin: 0 0 12px; white-space: pre-line; }
table.lab { border-collapse: collapse; margin: 4px 0 14px 24px; font-size: 15px; }
table.lab td { padding: 2px 18px 2px 0; vertical-align: top; }
.choices { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.choice { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; padding: 10px 12px;
  border: 1px solid var(--line); background: var(--panel); color: var(--text); border-radius: 8px; }
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice .l { font-weight: 700; min-width: 1.4em; }
.choice.selected { border-color: var(--accent); background: var(--accent-soft); }
.choice.correct { border-color: var(--ok); background: var(--ok-soft); }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.choice:disabled { cursor: default; }
.choice .tag { margin-left: auto; font-size: 13px; font-weight: 600; }
.verdict { margin: 16px 0 0; padding: 12px 14px; border-radius: 8px; font-weight: 600; }
.verdict.ok { background: var(--ok-soft); color: var(--ok); }
.verdict.bad { background: var(--bad-soft); color: var(--bad); }
.verdict.none { background: var(--warn-soft); color: var(--warn); }
.verdict small { font-weight: 400; color: var(--muted); display: block; margin-top: 2px; }

.expl { margin-top: 18px; }
.expl h4 { margin: 18px 0 8px; }
.objective { background: var(--accent-soft); border-radius: 8px; padding: 12px 14px; }
.fig { margin: 8px 0 16px; text-align: center; }
.fig img, .exhibit img { max-width: 100%; height: auto; border: 1px solid var(--line); border-radius: 6px; cursor: zoom-in; }
.exhibits { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.exhibit { margin: 0; }
.exhibit figcaption { font-size: 13px; color: var(--muted); margin-top: 4px; }
.metaline { color: var(--muted); font-size: 14px; margin-top: 16px; }
.links { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.review-note { margin: 0 0 12px; padding: 10px 12px; border-radius: 8px; background: var(--warn-soft); color: var(--warn); font-size: 14px; }
details.orig { margin-top: 18px; font-size: 14px; }
details.orig img { max-width: 100%; margin: 8px 0; border: 1px solid var(--line); border-radius: 6px; }

.nav { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 16px; }
.grid { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 14px; }
.grid button { width: 36px; height: 32px; border-radius: 6px; border: 1px solid var(--line);
  background: var(--panel); color: var(--text); font-size: 13px; padding: 0; }
.grid button.cur { outline: 2px solid var(--accent); outline-offset: 1px; }
.grid button.answered { background: var(--accent-soft); }
.grid button.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.grid button.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.grid button.flag { border-style: dashed; border-color: var(--warn); }

/* ---- resultado del examen */
.score { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.score .big { font-size: 44px; font-weight: 800; }
.score .stat { font-size: 15px; }
.results { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 15px; }
.results th, .results td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }
.results tr { cursor: pointer; }
.results tr:hover td { background: var(--accent-soft); }

.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.85); display: flex; align-items: center;
  justify-content: center; z-index: 20; padding: 20px; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: 100%; background: #fff; border-radius: 6px; }
.lightbox .close { position: absolute; top: 12px; right: 18px; font-size: 32px; color: #fff; background: none; border: 0; }

@media (max-width: 600px) {
  .panel { padding: 16px; }
  table.lab { margin-left: 0; font-size: 14px; }
  .topbar { padding: 10px 16px; }
}
a.btn { display: inline-block; text-decoration: none; }
@media (max-width: 600px) {
  .results th:nth-child(5), .results td:nth-child(5) { display: none; }
  .results .badge { white-space: nowrap; }
}
@media (max-width: 600px) {
  .hero h1 { font-size: 23px; }
  .specs { grid-template-columns: 1fr 1fr; gap: 10px; }
  .spec { padding: 12px; grid-template-columns: 1fr; }
  .spec .ico { grid-row: auto; width: 40px; height: 40px; font-size: 21px; }
  .overall .bar { flex-basis: 100px; }
  .qhead .id { margin-left: 0; }
}

/* ---------- PWA: contenido, ajustes y diagnóstico ---------- */
.topbar .gear { text-decoration: none; font-size: 20px; padding: 2px 4px; }
.cfg { display: grid; gap: 14px; max-width: 760px; margin: 0 auto; }
.cfg h2 { font-size: 17px; margin: 0 0 8px; }
.kv { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.kv:last-child { border-bottom: 0; }
.kv > span:first-child { color: var(--muted); }
.okt { color: var(--ok); font-weight: 600; } .badt { color: var(--bad); font-weight: 600; } .warnt { color: var(--warn); font-weight: 600; }
.filebtn { display: inline-block; cursor: pointer; }
.cfg input[type=file] { display: none; }
.cfg .btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.pbar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: 10px; }
.pbar > span { display: block; height: 100%; background: var(--accent); width: 0; transition: width .2s; }
.diaglist { font-size: 13px; max-height: 320px; overflow: auto; margin: 6px 0 0; padding-left: 18px; }
.mono { font: 12px/1.4 ui-monospace, Menlo, monospace; white-space: pre-wrap; word-break: break-word; }
img.missing { min-height: 40px; outline: 2px dashed var(--bad); }
.welcome { max-width: 640px; margin: 24px auto; }
.welcome ol { padding-left: 20px; }
body { padding-bottom: env(safe-area-inset-bottom); }
.topbar { padding-top: max(10px, env(safe-area-inset-top)); }