/* =========================================================================
   Test de comprensión mecánica — estilos
   Concepto: hoja de dibujo técnico (marco, rótulo y cuadrícula de papel).
   Móvil primero. Vertical y horizontal sin sobreposiciones.
   ========================================================================= */

:root {
  --bg: #E6EAED;
  --paper: #FAFBFC;
  --ink: #17212E;
  --ink-2: #4E5B69;
  --ink-3: #75828F;
  --line: #C4CDD6;
  --grid: rgba(23, 33, 46, .055);
  --accent: #F2B200;
  --accent-soft: #FFF1C2;
  --cota: #2652B8;
  --ok: #1A7446;
  --ok-bg: #E2F1E8;
  --bad: #B02F27;
  --bad-bg: #F8E5E3;
  --skip: #8A6A12;
  --skip-bg: #F6EDD3;

  --gear: #D5DDE5;
  --steel: #B7C2CD;
  --steel2: #DFE5EB;
  --water: #AFD3EF;
  --water2: #8FBEE4;
  --load: #E6DAC1;
  --wood: #D9B57F;
  --concrete: #D1D1CC;
  --rope: #8C6431;

  --radius: 10px;
  --tap: 52px;
  --font: 'Archivo', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E1319; --paper: #161E27; --ink: #E5EBF1; --ink-2: #A1AEBB; --ink-3: #7C8A98; --line: #2C3846;
    --grid: rgba(229, 235, 241, .05); --accent-soft: #3A3010; --cota: #8AABFF;
    --ok: #4CC98A; --ok-bg: #10281C; --bad: #FF7A6E; --bad-bg: #331612; --skip: #E6C065; --skip-bg: #2E2611;
    --gear: #2B3745; --steel: #4A5765; --steel2: #2A3542; --water: #1E4C73; --water2: #2B6596;
    --load: #4C4433; --wood: #6E5737; --concrete: #3B3E42; --rope: #C9A170;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0E1319; --paper: #161E27; --ink: #E5EBF1; --ink-2: #A1AEBB; --ink-3: #7C8A98; --line: #2C3846;
  --grid: rgba(229, 235, 241, .05); --accent-soft: #3A3010; --cota: #8AABFF;
  --ok: #4CC98A; --ok-bg: #10281C; --bad: #FF7A6E; --bad-bg: #331612; --skip: #E6C065; --skip-bg: #2E2611;
  --gear: #2B3745; --steel: #4A5765; --steel2: #2A3542; --water: #1E4C73; --water2: #2B6596;
  --load: #4C4433; --wood: #6E5737; --concrete: #3B3E42; --rope: #C9A170;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
button { font: inherit; color: inherit; cursor: pointer; -webkit-tap-highlight-color: transparent; }
input { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--cota); outline-offset: 2px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

#app { min-height: 100vh; min-height: 100dvh; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: var(--tap); padding: 8px 20px; border-radius: var(--radius); text-align: center; line-height: 1.2;
  border: 1.5px solid var(--ink); background: var(--paper); color: var(--ink);
  font-weight: 650; font-size: 16px; letter-spacing: .005em; text-decoration: none;
  transition: transform .08s ease, background-color .15s ease;
}
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-ghost { border-color: var(--line); background: transparent; }
.btn[disabled] { opacity: .45; pointer-events: none; }
.btn svg { width: 20px; height: 20px; flex: none; }
.ico-btn {
  width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--paper); display: inline-grid; place-items: center; flex: none;
}
.ico-btn svg { width: 22px; height: 22px; }

/* =========================================================================
   INICIO
   ========================================================================= */
.topbar { display: flex; justify-content: flex-end; margin-bottom: 2px; }

/* Selector de idioma ES | EN */
.lang {
  display: inline-flex; flex: none; border: 1.5px solid var(--ink); border-radius: 9px; overflow: hidden;
  background: var(--paper);
}
.lang button {
  min-width: 46px; min-height: 40px; padding: 0 10px; border: 0; background: transparent;
  font-weight: 750; font-size: 14px; letter-spacing: .03em; color: var(--ink-2);
}
.lang button + button { border-left: 1.5px solid var(--ink); }
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.lang.sm button { min-width: 40px; min-height: 38px; padding: 0 8px; font-size: 13px; }
.home.calm .hero-art .g1, .home.calm .hero-art .g2, .home.calm .hero-art .g3 { animation: none; }

.home {
  max-width: 760px; margin: 0 auto;
  padding: calc(20px + var(--safe-t)) calc(16px + var(--safe-r)) calc(36px + var(--safe-b)) calc(16px + var(--safe-l));
}
.hero { position: relative; padding: 8px 0 18px; }
.hero-art { width: 100%; max-width: 420px; height: auto; display: block; margin: 0 0 8px -6px; }
.hero h1 {
  margin: 0; font-weight: 800; font-stretch: 72%; font-size: clamp(40px, 12vw, 64px);
  line-height: .95; letter-spacing: -.01em;
}
.hero p { margin: 12px 0 0; color: var(--ink-2); max-width: 46ch; font-size: 17px; }

.resume {
  margin: 18px 0 4px; padding: 14px 16px; border-radius: var(--radius);
  background: var(--accent-soft); border: 1.5px solid var(--accent);
  display: grid; grid-template-columns: 1fr auto; gap: 10px 12px; align-items: center;
}
.resume strong { display: block; font-size: 16px; }
.resume span { color: var(--ink-2); font-size: 14px; }
.resume .row { grid-column: 1 / -1; display: flex; gap: 10px; flex-wrap: wrap; }
.resume .btn { min-height: 46px; padding: 0 16px; font-size: 15px; }

.field { margin: 22px 0 8px; }
.field label { display: block; font-size: 14px; color: var(--ink-2); margin-bottom: 6px; }
.field input {
  width: 100%; min-height: 50px; padding: 0 14px; border-radius: var(--radius);
  border: 1.5px solid var(--line); background: var(--paper); font-size: 17px;
}
.field input:focus { border-color: var(--cota); outline: none; }

.tests { display: grid; gap: 14px; margin-top: 22px; }
.sheet-card {
  position: relative; display: grid; grid-template-columns: auto 1fr; gap: 0 16px; align-items: start;
  width: 100%; text-align: left; padding: 18px 16px 16px; border-radius: 4px;
  background: var(--paper); border: 1.5px solid var(--ink);
  box-shadow: inset 0 0 0 4px var(--paper), inset 0 0 0 5px var(--line);
}
.sheet-card:active { transform: scale(.995); }
.sheet-card .num {
  grid-row: span 3; font-weight: 800; font-stretch: 62%; font-size: 64px; line-height: .8;
  color: var(--ink); min-width: 38px; padding-top: 4px; font-variant-numeric: tabular-nums;
}
.sheet-card h2 { margin: 0; font-size: 21px; font-weight: 750; font-stretch: 85%; line-height: 1.15; }
.sheet-card p { margin: 4px 0 0; color: var(--ink-2); font-size: 15px; line-height: 1.4; }
.sheet-card .meta { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 14px; color: var(--ink-2); }
.sheet-card .best { color: var(--ink); font-weight: 650; }
.sheet-card .go { position: absolute; right: 14px; top: 16px; color: var(--ink-3); }
.sheet-card .go svg { width: 22px; height: 22px; }

.how { margin-top: 30px; color: var(--ink-2); font-size: 15px; }
.how h3 { margin: 0 0 6px; color: var(--ink); font-size: 16px; font-weight: 700; }
.how ol { margin: 0; padding-left: 20px; }
.how li { margin: 4px 0; }
.credits { margin-top: 26px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: 13px; }

/* =========================================================================
   TEST (pantalla de preguntas)
   ========================================================================= */
.quiz {
  height: 100vh; height: 100dvh;
  display: grid; grid-template-rows: auto auto 1fr auto;
  max-width: 980px; margin: 0 auto;
}
.qbar {
  display: flex; align-items: center; gap: 12px;
  padding: calc(10px + var(--safe-t)) calc(14px + var(--safe-r)) 8px calc(14px + var(--safe-l));
}
.qtitle { flex: 1; min-width: 0; line-height: 1.15; }
.qtitle strong, .qtitle span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.qtitle span { display: block; }
.qtitle strong { display: block; font-size: 17px; font-weight: 750; font-stretch: 85%; }
.qtitle span { font-size: 13px; color: var(--ink-2); }
.timer {
  font-variant-numeric: tabular-nums; font-weight: 650; font-size: 15px; color: var(--ink-2);
  display: inline-flex; align-items: center; gap: 5px;
}
.timer svg { width: 17px; height: 17px; }

.ticks {
  display: grid; grid-template-columns: repeat(var(--n), 1fr); gap: 3px;
  padding: 0 calc(14px + var(--safe-r)) 10px calc(14px + var(--safe-l));
}
.ticks i { height: 6px; border-radius: 2px; background: var(--line); }
.ticks i.done { background: var(--ink-2); }
.ticks i.now { background: var(--accent); box-shadow: 0 0 0 1.5px var(--ink) inset; }

.qmain {
  overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain;
  padding: 2px calc(14px + var(--safe-r)) 18px calc(14px + var(--safe-l));
}
.qgrid { display: grid; gap: 16px; }

/* Hoja de dibujo con rótulo */
.drawing {
  margin: 0; background: var(--paper);
  border: 1.5px solid var(--ink); border-radius: 3px;
  padding: 5px;
}
.drawing .frame {
  border: 1px solid var(--ink-3);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 12px 12px;
  background-position: -1px -1px;
  padding: 10px 8px 6px;
}
.drawing .dg { max-height: 40vh; max-height: 40dvh; margin: 0 auto; }
.rotulo {
  display: grid; grid-template-columns: auto 1fr; border: 1px solid var(--ink-3); border-top: 0;
  font-size: 13px; line-height: 1.2;
}
.rotulo > div { padding: 6px 10px; }
.rotulo > div + div { border-left: 1px solid var(--ink-3); }
.rotulo b { font-weight: 750; font-variant-numeric: tabular-nums; }
.rotulo span { color: var(--ink-2); }

.qtext { margin: 0; font-size: 18px; line-height: 1.45; font-weight: 500; max-width: 62ch; }

.opts { display: grid; gap: 10px; margin-top: 14px; }
.opt {
  display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: center;
  width: 100%; min-height: var(--tap); padding: 12px 14px; text-align: left;
  border-radius: var(--radius); border: 1.5px solid var(--line); background: var(--paper);
  font-size: 16.5px; line-height: 1.3; font-weight: 500;
  transition: border-color .12s ease, background-color .12s ease;
}
.opt .mark {
  width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--ink-3);
  display: grid; place-items: center; background: var(--paper);
}
.opt[aria-checked="true"] { border-color: var(--ink); background: var(--accent-soft); box-shadow: inset 4px 0 0 var(--accent); }
.opt[aria-checked="true"] .mark { border-color: var(--ink); background: var(--ink); }
.opt[aria-checked="true"] .mark::after { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

.qnav {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; align-items: center;
  padding: 10px calc(14px + var(--safe-r)) calc(10px + var(--safe-b)) calc(14px + var(--safe-l));
  border-top: 1px solid var(--line); background: var(--bg);
}
.qnav .btn { padding: 0 12px; }
.qnav .pos {
  min-height: 46px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper);
  font-variant-numeric: tabular-nums; font-weight: 650; font-size: 15px; display: inline-flex; align-items: center; gap: 6px;
}
.qnav .pos svg { width: 18px; height: 18px; }

/* =========================================================================
   Hojas modales (mapa de preguntas y confirmación)
   ========================================================================= */
.veil {
  position: fixed; inset: 0; z-index: 40; background: rgba(10, 14, 20, .5);
  display: flex; align-items: flex-end; justify-content: center;
  animation: fade .16s ease;
}
.panel {
  width: 100%; max-width: 560px; max-height: 88vh; max-height: 88dvh; overflow-y: auto;
  background: var(--paper); border-radius: 16px 16px 0 0;
  padding: 18px calc(16px + var(--safe-r)) calc(18px + var(--safe-b)) calc(16px + var(--safe-l));
  animation: rise .2s ease;
}
.panel h3 { margin: 0 0 4px; font-size: 19px; font-weight: 750; font-stretch: 88%; }
.panel p { margin: 0 0 14px; color: var(--ink-2); font-size: 15px; }
.panel .actions { display: grid; gap: 10px; margin-top: 16px; }
.qmap { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.qmap button {
  min-height: 48px; border-radius: 8px; border: 1.5px solid var(--line); background: var(--paper);
  font-weight: 650; font-variant-numeric: tabular-nums;
}
.qmap button.done { background: var(--steel2); border-color: var(--ink-3); }
.qmap button.now { border-color: var(--ink); box-shadow: inset 0 -4px 0 var(--accent); }
.legend { display: flex; gap: 16px; margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 5px; border: 1.5px solid var(--ink-3); }
.legend i.d { background: var(--steel2); }

@keyframes fade { from { opacity: 0; } }
@keyframes rise { from { transform: translateY(24px); opacity: .6; } }

/* =========================================================================
   RESULTADO Y REPORTE
   ========================================================================= */
.result {
  max-width: 820px; margin: 0 auto;
  padding: calc(12px + var(--safe-t)) calc(16px + var(--safe-r)) calc(36px + var(--safe-b)) calc(16px + var(--safe-l));
}
.rbar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.rbar .qtitle { flex: 1; }
.rbar .qtitle strong { font-size: 18px; }

.score {
  background: var(--paper); border: 1.5px solid var(--ink); border-radius: 3px; padding: 5px;
}
.score .frame { border: 1px solid var(--ink-3); padding: 18px 16px 16px; }
.score .big {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  font-weight: 800; font-stretch: 62%; line-height: .85; font-variant-numeric: tabular-nums;
}
.score .big .n { font-size: clamp(88px, 28vw, 132px); }
.score .big .of { font-size: clamp(36px, 11vw, 52px); color: var(--ink-2); }
.score .pct { font-size: 20px; font-weight: 700; margin-top: 10px; }
.score .verdict { margin: 4px 0 0; color: var(--ink-2); font-size: 16px; max-width: 52ch; }
.score .facts { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 14px; color: var(--ink-2); }
.score .facts b { color: var(--ink); font-weight: 650; }

.strip { display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; margin-top: 16px; }
.strip a {
  display: grid; place-items: center; min-height: 34px; border-radius: 4px; text-decoration: none;
  font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; border: 1.5px solid transparent;
}
.strip a.ok { background: var(--ok-bg); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 35%, transparent); }
.strip a.bad { background: var(--bad-bg); color: var(--bad); border-color: color-mix(in srgb, var(--bad) 35%, transparent); }
.strip a.skip { background: var(--skip-bg); color: var(--skip); border-color: color-mix(in srgb, var(--skip) 35%, transparent); }

.ractions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.ractions .btn { flex: 1 1 calc(50% - 5px); padding-left: 12px; padding-right: 12px; }
.ractions .wide { flex-basis: 100%; }

.block { margin-top: 28px; }
.block > h2 { margin: 0 0 12px; font-size: 22px; font-weight: 750; font-stretch: 85%; line-height: 1.2; }
.block > h2 small { font-size: 15px; font-weight: 600; color: var(--ink-2); font-stretch: 100%; }

.topics { display: grid; gap: 10px; }
.topic { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; font-size: 15px; }
.topic .bar { grid-column: 1 / -1; height: 8px; border-radius: 4px; background: var(--bad-bg); overflow: hidden; }
.topic .bar i { display: block; height: 100%; background: var(--ok); border-radius: 4px; }
.topic b { font-variant-numeric: tabular-nums; font-weight: 650; }

.item {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin-bottom: 14px; scroll-margin-top: 16px;
}
.item.bad { border-left: 5px solid var(--bad); }
.item.skip { border-left: 5px solid var(--skip); }
.item.ok { border-left: 5px solid var(--ok); }
.item .ih { display: flex; justify-content: space-between; gap: 10px; font-size: 13px; color: var(--ink-2); margin-bottom: 8px; }
.item .ih b { color: var(--ink); font-variant-numeric: tabular-nums; }
.item .iq { margin: 0 0 12px; font-size: 16.5px; font-weight: 500; line-height: 1.45; }
.item .idg { border: 1px solid var(--line); border-radius: 6px; padding: 8px; margin-bottom: 12px;
  background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 12px 12px; }
.item .idg .dg { max-height: 260px; margin: 0 auto; }
.ans { display: grid; gap: 8px; margin-bottom: 12px; }
.ans div { padding: 10px 12px; border-radius: 8px; font-size: 15.5px; line-height: 1.35; }
.ans .yours { background: var(--bad-bg); color: var(--ink); }
.ans .yours.skipped { background: var(--skip-bg); }
.ans .right { background: var(--ok-bg); color: var(--ink); }
.ans small { display: block; font-size: 12.5px; font-weight: 700; margin-bottom: 2px; }
.ans .yours small { color: var(--bad); }
.ans .yours.skipped small { color: var(--skip); }
.ans .right small { color: var(--ok); }
.expl { border-top: 1px dashed var(--line); padding-top: 10px; }
.expl small { display: block; font-size: 12.5px; font-weight: 700; color: var(--cota); margin-bottom: 4px; }
.expl p { margin: 0; font-size: 16px; line-height: 1.55; max-width: 68ch; }

details.item > summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: start; }
details.item > summary::-webkit-details-marker { display: none; }
details.item > summary .iq { margin: 0; font-size: 15.5px; }
details.item > summary .chev { width: 22px; height: 22px; color: var(--ink-3); transition: transform .15s ease; margin-top: 2px; }
details.item[open] > summary .chev { transform: rotate(180deg); }
details.item[open] > summary { margin-bottom: 12px; }
.empty { padding: 16px; border: 1px dashed var(--line); border-radius: var(--radius); color: var(--ink-2); font-size: 15px; }

.toast {
  position: fixed; left: 50%; bottom: calc(18px + var(--safe-b)); transform: translateX(-50%);
  background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 10px; font-size: 15px; z-index: 60;
  animation: fade .2s ease;
}

/* =========================================================================
   DIAGRAMAS (SVG)
   ========================================================================= */
.dg { width: 100%; height: auto; display: block; font-family: var(--font); overflow: visible; }
.dg .s { stroke: var(--ink); stroke-width: 1.5; fill: none; }
.dg .s2 { stroke: var(--ink); stroke-width: 2; fill: none; stroke-linecap: round; }
.dg .hatch { stroke: var(--ink-2); stroke-width: 1; }
.dg .gear { fill: var(--gear); stroke: var(--ink); stroke-width: 1.3; stroke-linejoin: round; }
.dg .shaft-mate .gear { fill: var(--steel); }
.dg .gear-ring { fill: none; stroke: var(--ink-2); stroke-width: .8; opacity: .55; }
.dg .hub { fill: var(--paper); stroke: var(--ink); stroke-width: 1.4; }
.dg .axle { fill: var(--ink); }
.dg .shaft-ring { fill: none; stroke: var(--cota); stroke-width: 2; }
.dg .link { stroke: var(--cota); stroke-width: 1.5; stroke-dasharray: 5 3; }
.dg text { fill: var(--ink); font-size: 12px; }
.dg .t { font-size: 12px; }
.dg .tb { font-size: 12.5px; font-weight: 700; }
.dg .ts { font-size: 11px; fill: var(--ink-2); font-weight: 500; }
.dg .td { font-size: 11px; fill: var(--cota); font-weight: 650; }
.dg .tg { font-size: 13px; font-weight: 750; }
.dg .tq { font-size: 24px; font-weight: 800; fill: var(--cota); }
.dg .arw { stroke: var(--cota); stroke-width: 2; fill: none; stroke-linecap: round; }
.dg .arw-h { fill: var(--cota); }
.dg .dim { stroke: var(--cota); stroke-width: 1; fill: none; }
.dg .ext { stroke: var(--ink-3); stroke-width: .8; stroke-dasharray: 3 3; }
.dg .rope { stroke: var(--rope); stroke-width: 2.2; fill: none; stroke-linecap: round; }
.dg .pul { fill: var(--gear); stroke: var(--ink); stroke-width: 1.5; }
.dg .pul-in { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.dg .belt { stroke: var(--ink); stroke-width: 2.4; fill: none; }
.dg .chain { stroke: var(--ink); stroke-width: 3; stroke-dasharray: 4 2; fill: none; }
.dg .load { fill: var(--load); stroke: var(--ink); stroke-width: 1.4; }
.dg .beam, .dg .fulc, .dg .piston, .dg .limb-r { fill: var(--steel); stroke: var(--ink); stroke-width: 1.4; }
.dg .spr { stroke: var(--ink); stroke-width: 1.6; fill: none; stroke-linejoin: round; }
.dg .wire { stroke: var(--ink); stroke-width: 1.8; fill: none; stroke-linejoin: round; }
.dg .mask { fill: var(--paper); }
.dg .plate { stroke: var(--ink); stroke-width: 2; }
.dg .plate2 { stroke: var(--ink); stroke-width: 4.5; }
.dg .bulb { fill: var(--paper); stroke: var(--ink); stroke-width: 1.6; }
.dg .bulb-x { stroke: var(--ink); stroke-width: 1.2; }
.dg .blade { stroke: var(--ink); stroke-width: 2.2; stroke-linecap: round; }
.dg .term { fill: var(--paper); stroke: var(--ink); stroke-width: 1.4; }
.dg .resistor, .dg .fuse { fill: var(--paper); stroke: var(--ink); stroke-width: 1.6; }
.dg .jn { fill: var(--ink); }
.dg .water, .dg .water-f { fill: var(--water); }
.dg .water2 { fill: var(--water2); }
.dg .wall { stroke: var(--ink); stroke-width: 2.2; fill: none; stroke-linejoin: round; stroke-linecap: round; }
.dg .hole { fill: var(--paper); stroke: var(--ink); stroke-width: 1.4; }
.dg .ramp, .dg .concrete, .dg .rock { fill: var(--concrete); stroke: var(--ink); stroke-width: 1.4; stroke-linejoin: round; }
.dg .cg { fill: var(--ink); stroke: var(--paper); stroke-width: 1.5; }
.dg .pt { fill: var(--cota); }
.dg .bob { fill: var(--steel); stroke: var(--ink); stroke-width: 1.4; }
.dg .trail { stroke: var(--ink-3); stroke-width: 1.3; stroke-dasharray: 4 4; fill: none; }
.dg .ring { fill: var(--steel); stroke: var(--ink); stroke-width: 1.4; }
.dg .nut { fill: var(--gear); stroke: var(--ink); stroke-width: 1.3; }
.dg .wheel { fill: var(--gear); stroke: var(--ink); stroke-width: 1.6; }
.dg .rim { fill: var(--paper); stroke: var(--ink); stroke-width: 1; }
.dg .frame { stroke: var(--ink-2); stroke-width: 4; stroke-linecap: round; }
.dg .rod { stroke: var(--ink); stroke-width: 4; stroke-linecap: round; }
.dg .track { stroke: var(--ink); stroke-width: 2.6; fill: none; stroke-linecap: round; }
.dg .car { fill: var(--accent); stroke: var(--ink); stroke-width: 1.4; }
.dg .wood { fill: var(--wood); stroke: var(--ink); stroke-width: 1.4; }
.dg .thread { stroke: var(--ink-2); stroke-width: 1.1; }
.dg .shank { fill: var(--steel2); stroke: var(--ink); stroke-width: 1.4; }
.dg .shaft { stroke: var(--ink); stroke-width: 4; stroke-linecap: round; }
.dg .limb { stroke: var(--steel); stroke-width: 11; stroke-linecap: round; }
.dg .brass { fill: #D8B142; stroke: var(--ink); stroke-width: 1.2; }
.dg .steel { fill: var(--steel); stroke: var(--ink); stroke-width: 1.2; }
.dg .flame { fill: #F39A1E; stroke: #C2410C; stroke-width: 1; }
.dg .tube-o { stroke: var(--ink); stroke-width: 9; fill: none; stroke-linejoin: round; }
.dg .tube-i { stroke: var(--water2); stroke-width: 5.5; fill: none; stroke-linejoin: round; }
.dg .ghost { stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 3 4; fill: none; }
.dg .crank { stroke: var(--ink); stroke-width: 5; stroke-linecap: round; }
.dg .dot { fill: var(--ink); }

/* Arte del inicio */
.hero-art .g1, .hero-art .g2, .hero-art .g3 { transform-box: view-box; }
@media (prefers-reduced-motion: no-preference) {
  .hero-art .g1 { animation: spin-cw 2.4s cubic-bezier(.2, .7, .2, 1) both; }
  .hero-art .g2 { animation: spin-ccw-2 2.4s cubic-bezier(.2, .7, .2, 1) both; }
  .hero-art .g3 { animation: spin-cw-3 2.4s cubic-bezier(.2, .7, .2, 1) both; }
}
/* Giros proporcionales a los dientes (26 : 15 : 21), como engranarían de verdad */
@keyframes spin-cw { from { transform: rotate(-120deg); } to { transform: rotate(0); } }
@keyframes spin-ccw-2 { from { transform: rotate(208deg); } to { transform: rotate(0); } }
@keyframes spin-cw-3 { from { transform: rotate(-148.6deg); } to { transform: rotate(0); } }

/* =========================================================================
   RESPONSIVE
   ========================================================================= */
@media (min-width: 700px) {
  .tests { grid-template-columns: 1fr; }
  .qmain { padding-top: 6px; }
  .drawing .dg { max-height: 44vh; max-height: 44dvh; }
  .ractions .btn { flex: 1 1 140px; }
  .ractions .wide { flex: 1 1 100%; }
  .veil { align-items: center; }
  .panel { border-radius: 16px; }
}
@media (min-width: 900px) and (min-height: 561px) {
  .qgrid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: start; gap: 22px; }
  .drawing { position: sticky; top: 0; }
  .drawing .dg { max-height: 62vh; max-height: 62dvh; }
}

/* Celular acostado: se resuelve por ALTURA. Diagrama a la izquierda, pregunta y opciones a la derecha. */
@media (max-height: 560px) and (orientation: landscape) {
  .quiz { max-width: none; }
  .qbar { padding-top: calc(6px + var(--safe-t)); padding-bottom: 4px; }
  .qbar .ico-btn { width: 38px; height: 38px; }
  .qtitle strong { font-size: 15px; display: inline; }
  .qtitle span { font-size: 12.5px; margin-left: 6px; display: inline; }
  .lang.sm button { min-height: 34px; }
  .ticks { padding-bottom: 6px; }
  .ticks i { height: 4px; }
  .qmain { padding-bottom: 10px; }
  .qgrid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
  .drawing { position: sticky; top: 0; }
  .drawing .frame { padding: 6px; }
  /* alto disponible = pantalla − barra superior − marcas − barra inferior − márgenes */
  .drawing .dg { max-height: calc(100dvh - 170px); max-height: calc(100vh - 170px); }
  @supports (height: 100dvh) { .drawing .dg { max-height: calc(100dvh - 170px); } }
  .rotulo { font-size: 12px; }
  .rotulo > div { padding: 4px 8px; }
  .qtext { font-size: 16px; }
  .opts { gap: 8px; margin-top: 10px; }
  .opt { min-height: 44px; padding: 8px 12px; font-size: 15px; }
  .qnav { padding-top: 6px; padding-bottom: calc(6px + var(--safe-b)); }
  .qnav .btn { min-height: 42px; }
  .qnav .pos { min-height: 40px; }

  .home .hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 20px; align-items: center; }
  .home .hero-art { grid-row: span 2; margin: 0; }
  .home .tests { grid-template-columns: repeat(3, 1fr); }
  .sheet-card { grid-template-columns: 1fr; }
  .sheet-card .num { grid-row: auto; font-size: 48px; margin-bottom: 6px; }

  .result .score .frame { display: grid; grid-template-columns: auto 1fr; gap: 4px 24px; align-items: end; }
  .result .score .strip { grid-column: 1 / -1; }
  .score .big .n { font-size: 96px; }
  .ractions .btn { flex: 1 1 140px; min-height: 46px; }
  .ractions .wide { flex: 2 1 220px; }
  .hero h1 { font-size: clamp(36px, 6.4vw, 58px); }
  .panel { max-height: 94vh; max-height: 94dvh; }
  .veil { align-items: center; }
  .panel { border-radius: 14px; }
  .qmap { grid-template-columns: repeat(10, 1fr); }
}

@media (max-width: 360px) {
  body { font-size: 16px; }
  .qbar { gap: 8px; }
  .timer svg { display: none; }
  .qtext { font-size: 17px; }
  .opt { font-size: 15.5px; padding: 10px 12px; }
  .qnav { gap: 8px; }
  .qnav .btn { padding: 0 10px; font-size: 15px; }
}

/* =========================================================================
   IMPRESIÓN (Guardar reporte en PDF)
   ========================================================================= */
@media print {
  @page { margin: 14mm 12mm; }
  :root { --bg: #fff; --paper: #fff; }
  body { background: #fff; font-size: 12pt; }
  .no-print, .lang, .rbar .ico-btn, .ractions, .toast, .veil { display: none !important; }
  .result { max-width: none; padding: 0; }
  .item, .score, .topic { break-inside: avoid; }
  details.item > summary .chev { display: none; }
  .strip a { border: 1px solid #999 !important; }
  /* Reporte compacto: diagrama a la izquierda, texto a la derecha */
  .block > h2 { font-size: 15pt; margin-bottom: 8px; break-after: avoid; }
  .item { display: grid; grid-template-columns: 33% 1fr; column-gap: 14px; padding: 10px 12px; margin-bottom: 10px; }
  .item > * { grid-column: 2; }
  .item > .idg { grid-column: 1; grid-row: 1 / span 5; align-self: start; margin: 0; padding: 4px; }
  .item .idg .dg { max-height: 150px; }
  .item .ih { margin-bottom: 4px; font-size: 9pt; }
  .item .iq, details.item > summary .iq { font-size: 10.5pt; margin-bottom: 6px; }
  details.item > summary { display: block; margin-bottom: 6px; }
  .ans { gap: 5px; margin-bottom: 6px; }
  .ans div { padding: 5px 8px; font-size: 10pt; }
  .ans small, .expl small { font-size: 8.5pt; }
  .expl { padding-top: 6px; }
  .expl p { font-size: 10pt; line-height: 1.45; }
  .topic { font-size: 10pt; }
}