/* ITIL 4 Foundation — Material de estudio y simulador
   Diseño propio, sin marcos externos. Tema claro/oscuro. */

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #eef1f8;
  --border: #dce1ec;
  --text: #1c2430;
  --text-soft: #55607a;
  --text-faint: #8a93a8;
  --primary: #4b3ca7;      /* indigo */
  --primary-soft: #ece9f9;
  --primary-strong: #372c86;
  --accent: #0e9488;       /* teal */
  --accent-soft: #d8f3ef;
  --ok: #1f9d55;
  --ok-soft: #dcf3e6;
  --warn: #c9820a;
  --warn-soft: #fbf0d6;
  --bad: #d0384e;
  --bad-soft: #fbe0e4;
  --shadow: 0 1px 3px rgba(20, 25, 40, .08), 0 8px 24px rgba(20, 25, 40, .06);
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1320;
    --surface: #171c2b;
    --surface-2: #1f2537;
    --border: #2b3345;
    --text: #e7ebf4;
    --text-soft: #a8b1c6;
    --text-faint: #737d95;
    --primary: #8b7ff0;
    --primary-soft: #262246;
    --primary-strong: #a99cff;
    --accent: #2dd4bf;
    --accent-soft: #123c39;
    --ok: #46c47c;
    --ok-soft: #14331f;
    --warn: #e0a94a;
    --warn-soft: #362a12;
    --bad: #ef6b7f;
    --bad-soft: #3a1a20;
    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #0f1320; --surface: #171c2b; --surface-2: #1f2537; --border: #2b3345;
  --text: #e7ebf4; --text-soft: #a8b1c6; --text-faint: #737d95;
  --primary: #8b7ff0; --primary-soft: #262246; --primary-strong: #a99cff;
  --accent: #2dd4bf; --accent-soft: #123c39;
  --ok: #46c47c; --ok-soft: #14331f; --warn: #e0a94a; --warn-soft: #362a12;
  --bad: #ef6b7f; --bad-soft: #3a1a20;
  --shadow: 0 1px 3px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand__badge {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-weight: 800; font-size: 13px; letter-spacing: .5px;
}
.brand__name { font-size: 15px; line-height: 1.1; }
.brand__name small { display: block; font-weight: 500; color: var(--text-soft); font-size: 11px; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav a {
  padding: 7px 12px; border-radius: 8px; color: var(--text-soft); font-weight: 600; font-size: 14px;
}
.nav a:hover { background: var(--surface-2); text-decoration: none; color: var(--text); }
.nav a.active { background: var(--primary-soft); color: var(--primary-strong); }
.nav a.nav__home { border: 1px solid var(--border); color: var(--text); background: var(--surface-2); }
.nav a.nav__home:hover { border-color: var(--primary); color: var(--primary-strong); background: var(--primary-soft); }
.theme-toggle {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-soft);
  width: 36px; height: 36px; border-radius: 9px; cursor: pointer; font-size: 16px;
  display: grid; place-items: center;
}
.theme-toggle:hover { background: var(--surface-2); }

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 24px 16px 64px; }
.container-narrow { max-width: 820px; margin: 0 auto; }

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 40px 16px 8px; }
.hero h1 { font-size: clamp(28px, 5vw, 42px); margin: 0 0 10px; letter-spacing: -.5px; }
.hero p { color: var(--text-soft); font-size: 18px; max-width: 640px; margin: 0 auto 8px; }
.hero .kbd { color: var(--accent); font-weight: 700; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 28px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px;
  transition: transform .12s ease, box-shadow .12s ease;
}
.card--link:hover { transform: translateY(-3px); text-decoration: none; box-shadow: 0 10px 30px rgba(20,25,40,.12); }
.card__icon { font-size: 26px; }
.card h3 { margin: 0; font-size: 19px; color: var(--text); }
.card p { margin: 0; color: var(--text-soft); font-size: 14.5px; }
.card__cta { margin-top: auto; color: var(--primary-strong); font-weight: 700; font-size: 14px; }

/* ---------- Generic blocks ---------- */
.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; }
.stat { background: var(--surface-2); border-radius: var(--radius-sm); padding: 14px; text-align: center; }
.stat b { display: block; font-size: 24px; color: var(--primary-strong); }
.stat span { font-size: 12.5px; color: var(--text-soft); }

.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 700;
  background: var(--primary-soft); color: var(--primary-strong); vertical-align: middle;
}
.badge--type { background: var(--accent-soft); color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  font-weight: 700; font-size: 15px; font-family: inherit;
  background: var(--primary); color: #fff; transition: filter .12s ease, background .12s ease;
}
.btn:hover { filter: brightness(1.06); text-decoration: none; }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--accent { background: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn--sm { padding: 8px 14px; font-size: 13.5px; }

/* ---------- Study material ---------- */
.study { display: grid; grid-template-columns: 260px 1fr; gap: 28px; align-items: start; }
.toc {
  position: sticky; top: 74px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); max-height: calc(100vh - 96px); overflow: auto;
}
.toc h4 { margin: 4px 8px 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .8px; color: var(--text-faint); }
.toc a {
  display: block; padding: 8px 10px; border-radius: 8px; color: var(--text-soft); font-size: 14px; font-weight: 600;
}
.toc a:hover { background: var(--surface-2); text-decoration: none; color: var(--text); }
.toc a.active { background: var(--primary-soft); color: var(--primary-strong); }
.toc a small { display: block; font-weight: 500; color: var(--text-faint); font-size: 11.5px; }

.content section { scroll-margin-top: 80px; margin-bottom: 40px; }
.content h2 {
  font-size: 24px; margin: 0 0 6px; letter-spacing: -.3px; padding-bottom: 8px; border-bottom: 2px solid var(--primary-soft);
}
.content h3 { font-size: 18px; margin: 26px 0 8px; color: var(--primary-strong); }
.content h4 { font-size: 15.5px; margin: 18px 0 6px; }
.content p, .content li { color: var(--text); font-size: 15.5px; }
.content ul, .content ol { padding-left: 22px; }
.content .lead { color: var(--text-soft); font-size: 16px; }

.deftable { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14.5px; }
.deftable th, .deftable td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.deftable th { background: var(--surface-2); font-size: 12.5px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-soft); }
.deftable td:first-child { font-weight: 700; white-space: nowrap; color: var(--primary-strong); }

.callout {
  border-left: 4px solid var(--accent); background: var(--accent-soft);
  padding: 12px 16px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 16px 0; font-size: 14.5px;
}
.callout--tip { border-color: var(--ok); background: var(--ok-soft); }
.callout--key { border-color: var(--primary); background: var(--primary-soft); }
.callout b { color: var(--text); }

.pillrow { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.pill { background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px; font-size: 13px; font-weight: 600; }

.ref { color: var(--text-faint); font-size: 12px; font-weight: 600; }

/* ---------- Simulator ---------- */
.sim-config { max-width: 640px; margin: 0 auto; }
.field { margin: 16px 0; }
.field label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 14.5px; }
.field .hint { color: var(--text-soft); font-size: 13px; margin-top: 4px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.seg button { border: none; background: var(--surface); color: var(--text-soft); padding: 9px 16px; cursor: pointer; font-weight: 600; font-family: inherit; font-size: 14px; }
.seg button.active { background: var(--primary); color: #fff; }

.exam-bar {
  position: sticky; top: 62px; z-index: 20; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 12px 18px; margin-bottom: 18px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.timer { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 22px; letter-spacing: .5px; }
.timer.warn { color: var(--warn); }
.timer.danger { color: var(--bad); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .5; } }
.exam-progress { color: var(--text-soft); font-size: 14px; font-weight: 600; }
.exam-bar .spacer { margin-left: auto; }

.q-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.q-meta { display: flex; gap: 8px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.q-num { font-weight: 800; color: var(--text-faint); font-size: 13px; }
.q-text { font-size: 18px; font-weight: 600; margin: 0 0 8px; }
.q-sub { color: var(--text-soft); font-size: 14px; margin: 0 0 16px; }
.q-statements { margin: 0 0 16px; padding-left: 22px; }
.q-statements li { margin: 4px 0; }

.options { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px; padding: 13px 16px; border: 1.5px solid var(--border);
  border-radius: 11px; cursor: pointer; background: var(--surface); transition: border-color .1s, background .1s;
}
.opt:hover { border-color: var(--primary); background: var(--primary-soft); }
.opt.selected { border-color: var(--primary); background: var(--primary-soft); }
.opt__key {
  flex: none; width: 26px; height: 26px; border-radius: 7px; background: var(--surface-2); color: var(--text-soft);
  display: grid; place-items: center; font-weight: 800; font-size: 13px;
}
.opt.selected .opt__key { background: var(--primary); color: #fff; }
.opt__text { font-size: 15px; }
/* review states */
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.correct .opt__key { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong .opt__key { background: var(--bad); color: #fff; }

.exam-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; gap: 12px; }
.flag-btn { border: 1px solid var(--border); background: var(--surface); color: var(--text-soft); padding: 8px 14px; border-radius: 9px; cursor: pointer; font-weight: 600; font-family: inherit; font-size: 13.5px; }
.flag-btn.on { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }

.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 7px; margin-top: 14px; }
.qgrid button {
  aspect-ratio: 1; border: 1px solid var(--border); background: var(--surface); border-radius: 8px; cursor: pointer;
  font-weight: 700; font-size: 13px; color: var(--text-soft); font-family: inherit;
}
.qgrid button.answered { background: var(--primary-soft); border-color: var(--primary); color: var(--primary-strong); }
.qgrid button.flagged { background: var(--warn-soft); border-color: var(--warn); color: var(--warn); }
.qgrid button.current { outline: 2px solid var(--primary); outline-offset: 1px; }

/* Results */
.result-hero { text-align: center; padding: 20px; }
.score-ring { width: 168px; height: 168px; margin: 0 auto 8px; position: relative; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring__label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.score-ring__label b { font-size: 40px; line-height: 1; }
.score-ring__label span { font-size: 13px; color: var(--text-soft); }
.verdict { font-size: 26px; font-weight: 800; margin: 6px 0; }
.verdict.pass { color: var(--ok); }
.verdict.fail { color: var(--bad); }

.breakdown { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 14.5px; }
.breakdown th, .breakdown td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; }
.breakdown th { font-size: 12px; text-transform: uppercase; color: var(--text-soft); }
.breakdown .bar { height: 8px; border-radius: 4px; background: var(--surface-2); overflow: hidden; min-width: 80px; }
.breakdown .bar > i { display: block; height: 100%; background: var(--accent); }

.review-item { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 14px; background: var(--surface); }
.review-item .expl { margin-top: 10px; padding: 12px 14px; background: var(--surface-2); border-radius: var(--radius-sm); font-size: 14px; }
.review-item .expl b { color: var(--ok); }

.tag-ok { color: var(--ok); font-weight: 700; }
.tag-bad { color: var(--bad); font-weight: 700; }

footer.foot { border-top: 1px solid var(--border); margin-top: 40px; padding: 24px 16px; text-align: center; color: var(--text-faint); font-size: 13px; }
footer.foot a { color: var(--text-soft); }

.hidden { display: none !important; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .study { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; margin-bottom: 8px; }
  .toc__list { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
}
@media (max-width: 560px) {
  .brand__name small { display: none; }
  .nav a { padding: 6px 9px; font-size: 13px; }
  .wrap { padding: 16px 14px 48px; }
  .q-text { font-size: 16.5px; }
  .toc__list { grid-template-columns: 1fr; }
}

/* ---------- Narración por voz ---------- */
.audio-bar { display:flex; align-items:center; gap:10px; flex-wrap:wrap; background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-sm); padding:10px 14px; margin-bottom:22px; font-size:13.5px; }
.audio-bar__label { font-weight:700; }
.audio-bar__rate { color:var(--text-soft); margin-left:2px; }
.audio-rate { border:1px solid var(--border); border-radius:9px; overflow:hidden; }
.audio-rate button { border:none; background:var(--surface); color:var(--text-soft); padding:5px 11px; cursor:pointer; font-family:inherit; font-size:12.5px; font-weight:600; }
.audio-rate button.active { background:var(--primary); color:#fff; }
.section-audio { display:flex; gap:8px; margin:2px 0 16px; }
.audio-btn { font-family:inherit; font-size:12.5px; font-weight:600; cursor:pointer; border:1px solid var(--border); background:var(--surface); color:var(--primary-strong); border-radius:999px; padding:6px 14px; transition:background .12s,border-color .12s,color .12s; }
.audio-btn:hover { background:var(--primary-soft); border-color:var(--primary); }
.audio-btn.playing { background:var(--primary); color:#fff; border-color:var(--primary); }
.audio-btn--stop { color:var(--bad); padding:6px 11px; }
.audio-btn--stop:hover { background:var(--bad-soft); border-color:var(--bad); color:var(--bad); }

/* ---------- Control flotante de narración ---------- */
.audio-float { position:fixed; left:50%; bottom:18px; transform:translateX(-50%); display:flex; align-items:center; gap:10px; background:var(--surface); border:1px solid var(--border); border-radius:999px; box-shadow:var(--shadow); padding:8px 14px 8px 8px; z-index:60; max-width:calc(100vw - 24px); }
.audio-float .af-ctrl { width:38px; height:38px; border-radius:50%; border:1px solid var(--border); background:var(--surface); color:var(--primary-strong); cursor:pointer; font-size:14px; display:grid; place-items:center; flex:none; font-family:inherit; }
.audio-float .af-play { background:var(--primary); color:#fff; border-color:var(--primary); }
.audio-float .af-play:hover { filter:brightness(1.06); }
.audio-float .af-stop:hover:not(:disabled) { background:var(--bad-soft); border-color:var(--bad); color:var(--bad); }
.audio-float button:disabled { opacity:.4; cursor:default; }
.af-info { display:flex; flex-direction:column; min-width:0; max-width:240px; }
.af-title { font-weight:700; font-size:13px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.af-status { font-size:11.5px; color:var(--text-soft); }
.audio-float .seg { border:1px solid var(--border); border-radius:9px; overflow:hidden; }
.audio-float .seg button { border:none; background:var(--surface); color:var(--text-soft); padding:6px 9px; cursor:pointer; font-family:inherit; font-size:12px; font-weight:600; }
.audio-float .seg button.active { background:var(--primary); color:#fff; }
@media (max-width:560px) { .af-info { max-width:110px; } .audio-float { gap:7px; padding:7px 10px 7px 7px; } .audio-float .seg { display:none; } }