/* Sistema visual compartido (inspirado en jrf.mx):
   fondo papel, tinta cálida, acento azul marino, Manrope para títulos y DM Sans para texto. */
:root {
  --ink: #252421;
  --ink-soft: #55514a;
  --muted: #817c73;

  --paper: #f5f3ef;
  --paper-light: #fbfaf8;
  --paper-dark: #e8e4dc;
  --surface: #fbfaf8;

  --line: rgba(37, 36, 33, .14);

  --accent: #022754;
  --accent-hover: #063b7a;
  --accent-ink: #ffffff;
  --accent-soft: rgba(2, 39, 84, .08);
  --gold: #c9a13b;          /* US-150: contorno y relleno de las estrellas de calificación */

  --ok: #1f6b4f;
  --ok-soft: rgba(31, 107, 79, .1);
  --danger: #a63a2f;
  --danger-soft: rgba(166, 58, 47, .09);
  --warn-soft: rgba(201, 145, 40, .13);

  --code-bg: #242320;
  --code-ink: #ece9e3;

  --radius-large: 28px;
  --radius-medium: 16px;
  --radius: 16px;
  --transition: 260ms ease;
  --header-h: 72px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  overflow-x: hidden;
}
h1, h2, h3 {
  font-family: Manrope, "DM Sans", sans-serif; font-weight: 700;
  letter-spacing: -.05em; line-height: 1.08; margin: 0 0 .5em;
}
h1 { letter-spacing: -.065em; line-height: 1.04; }
h3 { letter-spacing: -.04em; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.wrap { width: min(100% - 32px, 1200px); margin-inline: auto; }
.accent { color: var(--accent); }
code {
  font: .88em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--paper-dark); color: var(--ink);
  padding: .12em .4em; border-radius: 5px;
}

/* ---------- Kicker (etiqueta superior con punto) ---------- */
.kicker {
  display: flex; align-items: center; gap: 10px; margin: 0 0 22px;
  color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase;
}
.kicker::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; flex: none;
  background: #67645d; box-shadow: 0 0 0 5px rgba(103, 100, 93, .11);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(245, 243, 239, .92);
  border-bottom: 1px solid rgba(37, 36, 33, .1);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.site-header nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: var(--header-h); }
.brand {
  display: inline-flex; align-items: center; gap: 11px; text-decoration: none;
  font-family: Manrope, sans-serif; font-size: 17px; font-weight: 800; letter-spacing: -.04em;
}
.brand em { font-style: normal; color: var(--accent); }
/* Logo JRF Supérate: imagen ~27 % mayor que la antigua caja "B" de 30px */
.brand-mark {
  display: block; flex: none; width: 38px; height: 38px; object-fit: contain;
}
@media (max-width: 420px) { .brand { gap: 8px; font-size: 15px; } }   /* compensa el logo más grande en celulares */
.nav-links { display: flex; gap: 34px; list-style: none; margin: 0; padding: 0; font-size: 13px; font-weight: 500; }
.nav-links a { text-decoration: none; color: var(--ink-soft); transition: color var(--transition); }
.nav-links a:hover { color: var(--ink); }
.crumbs { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--ink); }

/* ---------- Botones (píldora) ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 14px;
  min-height: 50px; padding: 0 22px; border-radius: 100px;
  background: var(--accent); color: #fff; border: 1px solid transparent;
  text-decoration: none; font: inherit; font-size: 13px; font-weight: 700; cursor: pointer;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}
.btn span[aria-hidden] { font-size: 17px; font-weight: 400; }
.btn:hover { transform: translateY(-3px); background: var(--accent-hover); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--ink); background: transparent; }
.btn.light { background: var(--paper); color: var(--ink); }
.btn.light:hover { background: #fff; }
.btn.small { min-height: 38px; padding: 0 17px; font-size: 12px; }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; background: var(--accent); }

/* ---------- Progreso ---------- */
.bar { height: 6px; background: var(--paper-dark); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s; }

/* ---------- Footer ---------- */
.site-footer { padding: 32px 0; border-top: 1px solid var(--line); background: var(--paper-light); color: var(--muted); font-size: 12px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

/* ================= Página de introducción del curso ================= */
.intro-top {
  position: relative; border-bottom: 1px solid var(--line);
  background: radial-gradient(circle at 84% 30%, rgba(213, 208, 198, .33), transparent 28%), var(--paper);
}
.intro-top::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(50,48,43,.03) 1px, transparent 1px), linear-gradient(90deg, rgba(50,48,43,.03) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 90%); -webkit-mask-image: linear-gradient(to bottom, black, transparent 90%);
}
.intro-hero { position: relative; padding-block: 72px 64px; display: grid; grid-template-columns: 1.3fr .7fr; gap: 56px; align-items: start; }
.intro-hero h1 { font-size: clamp(40px, 5.5vw, 68px); }
.btn-regresar { display: flex; width: fit-content; gap: 8px; margin: -44px 0 26px; }   /* US-151/152: mismo formato que Registrarse, cerca del menú superior */
.intro-hero .lead { font-size: 17px; line-height: 1.75; color: var(--ink-soft); max-width: 560px; }
.intro-hero p { color: var(--ink-soft); font-size: 15px; line-height: 1.8; max-width: 620px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 28px; padding: 0; list-style: none; }
.chips li { border: 1px solid var(--line); border-radius: 100px; padding: 6px 14px; font-size: 12px; font-weight: 600; color: var(--ink-soft); background: rgba(255,255,255,.35); }
.side-card {
  position: sticky; top: calc(var(--header-h) + 24px);
  background: var(--accent); color: var(--paper); border-radius: var(--radius-large); padding: 30px; overflow: hidden;
}
.side-card .icon { width: 56px; height: 56px; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; display: grid; place-items: center; font-size: 1.6rem; margin-bottom: 26px; }
.side-card .row { display: flex; justify-content: space-between; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: #b9c4d3; font-weight: 700; }
.side-card .pct { font-family: Manrope, sans-serif; font-size: 52px; font-weight: 700; letter-spacing: -.06em; line-height: 1; margin: 10px 0 14px; color: #fff; }
.side-card .bar { background: rgba(255,255,255,.15); }
.side-card .bar i { background: #fff; }
.side-card p { margin: 14px 0 24px; color: #c3cdd9; font-size: 13px; }
.side-card .btn { width: 100%; }

/* ---------- Calificación del curso (US-150): estrellas blancas con contorno dorado ---------- */
.encuesta { margin: 22px 0 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.18); text-align: left; }
.encuesta-titulo { margin: 0 0 4px !important; font-family: Manrope, sans-serif; font-weight: 700; font-size: 15px !important; color: #fff !important; }
.encuesta-leyenda { margin: 0 0 12px !important; font-size: 12.5px !important; line-height: 1.5; color: #c3cdd9 !important; }
.estrellas, .estrellas-fijas { display: inline-flex; gap: 4px; }
.encuesta .estrella { display: inline-grid; place-items: center; width: 30px; height: 30px; padding: 2px; border: 0; border-radius: 6px; background: transparent; cursor: pointer; transition: transform var(--transition); }
.estrellas-fijas .estrella { display: inline-grid; width: 22px; height: 22px; }
.estrella svg { width: 100%; height: 100%; fill: #fff; stroke: var(--gold); stroke-width: 1.6; stroke-linejoin: round; transition: fill 120ms ease; }
.estrella.on svg { fill: var(--gold); }
.encuesta button.estrella:hover { transform: scale(1.12); }
.encuesta button.estrella:focus-visible { outline: 2px solid var(--gold); outline-offset: 1px; }
.encuesta .btn-calificar { display: inline-flex; width: auto; margin: 12px 0 0; background: var(--paper); color: var(--accent); border: 1px solid var(--paper); }
.encuesta .btn-calificar:hover:not(:disabled) { background: #fff; }
.encuesta .btn-calificar:disabled { background: transparent; color: #c3cdd9; border-color: rgba(255,255,255,.3); cursor: not-allowed; }
.encuesta .estrellas { vertical-align: middle; margin-right: 10px; }
.encuesta-error { margin: 8px 0 0 !important; font-size: 13px !important; color: #ffd4cf !important; }
.encuesta-error:empty { display: none; }
.encuesta.hecha .estrellas-fijas { margin-top: 4px; }
.result .encuesta { max-width: 420px; margin: 26px auto 0; text-align: center; }
.result .encuesta .estrellas { justify-content: center; }
/* US-149: precio del curso de paga */
.side-card .precio-curso { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; margin: 4px 0 18px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.18); }
.side-card .precio-curso strong { white-space: nowrap; font-family: Manrope, sans-serif; font-size: 30px; font-weight: 700; letter-spacing: -.03em; color: #fff; }
.side-card .precio-curso span { font-size: 12px; color: #c3cdd9; }

.intro-body { display: grid; grid-template-columns: 1.3fr .7fr; gap: 56px; padding-block: 80px 110px; }
.intro-body section { margin-bottom: 56px; }
.intro-body h2 { font-size: clamp(30px, 3.4vw, 42px); }
.intro-body .note-line { color: var(--muted); font-size: 13px; margin: -6px 0 22px; }
.checks { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; border-top: 1px solid var(--line); }
.checks li { padding: 16px 0 16px 30px; position: relative; border-bottom: 1px solid var(--line); font-size: 14px; color: var(--ink-soft); }
.checks li::before { content: "↗"; position: absolute; left: 0; top: 15px; color: var(--accent); }
.plain { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.plain li { padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: 14px; }

.syllabus { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.syllabus li { border-bottom: 1px solid var(--line); }
.syllabus a, .syllabus .locked-row {
  display: grid; grid-template-columns: 45px 1fr auto; gap: 20px; align-items: start;
  padding: 24px 0; text-decoration: none; transition: padding var(--transition), background var(--transition);
}
.syllabus a:hover { padding-inline: 12px; background: var(--paper-light); }
.syllabus .num { font-family: Manrope, sans-serif; font-size: 11px; font-weight: 700; letter-spacing: .08em; color: var(--muted); padding-top: 5px; }
.syllabus strong { display: block; font-family: Manrope, sans-serif; font-size: 18px; letter-spacing: -.04em; color: var(--accent); }
.syllabus small { display: block; margin-top: 4px; color: var(--ink-soft); font-size: 13px; }
.syllabus .right { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); white-space: nowrap; padding-top: 5px; }
.syllabus .done .right { color: var(--ok); }
.syllabus .locked-row { cursor: not-allowed; opacity: .55; }
.syllabus .locked-row strong { color: var(--ink); }

/* ================= Página de lección ================= */
.layout { display: grid; grid-template-columns: 310px minmax(0, 1fr); min-height: calc(100vh - var(--header-h)); }
.sidebar {
  border-right: 1px solid var(--line); background: var(--paper-light);
  position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h)); overflow-y: auto; padding: 28px 18px 40px;
}
.sidebar .course-name { display: block; padding: 0 10px; text-decoration: none; font-family: Manrope, sans-serif; font-weight: 800; font-size: 17px; letter-spacing: -.04em; }
.sidebar .prog { padding: 12px 10px 22px; font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.sidebar .prog .bar { margin-top: 8px; height: 4px; }
.lesson-nav { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.lesson-nav a, .lesson-nav span.item {
  display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: start;
  padding: 13px 10px; border-bottom: 1px solid var(--line); text-decoration: none; font-size: 14px; line-height: 1.35;
  transition: background var(--transition);
}
.lesson-nav a:hover { background: var(--paper); }
.lesson-nav .ico { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 700; border: 1px solid var(--line); color: var(--muted); font-family: Manrope, sans-serif; }
.lesson-nav .done .ico { background: var(--accent); border-color: var(--accent); color: #fff; }
.lesson-nav .current { background: var(--accent-soft); font-weight: 700; color: var(--accent); }
.lesson-nav .current .ico { border-color: var(--accent); color: var(--accent); }
.lesson-nav .current.done .ico { color: #fff; }
.lesson-nav span.item { color: var(--muted); opacity: .6; cursor: not-allowed; }
.lesson-nav small { display: block; color: var(--muted); font-weight: 400; font-size: 11px; margin-top: 3px; letter-spacing: .02em; }
.lesson-nav .sep { height: 14px; border-bottom: 1px solid var(--line); }

.content { padding: 56px clamp(20px, 5vw, 72px) 96px; max-width: 920px; }
.content > .kicker { margin-bottom: 18px; }
.content h1 { font-size: clamp(34px, 4.5vw, 52px); }
.content .summary { color: var(--ink-soft); font-size: 17px; line-height: 1.7; margin-top: 0; }
.content h2 { font-size: clamp(24px, 2.6vw, 30px); margin-top: 52px; }
.content h3 { font-size: 19px; margin-top: 30px; }
.content p, .content li { color: var(--ink-soft); line-height: 1.8; }
.content li { margin-bottom: 6px; }
.content strong { color: var(--ink); }
.flash { background: var(--warn-soft); border-radius: var(--radius-medium); padding: 14px 18px; margin-bottom: 28px; font-size: 14px; }

.video { margin: 32px 0 8px; }
.video .frame { position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius-medium); overflow: hidden; background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video .links { display: flex; flex-wrap: wrap; gap: 6px 20px; font-size: 12px; color: var(--muted); margin-top: 10px; }
.video .links a { font-weight: 700; color: var(--accent); }

.codebox { margin: 20px 0 26px; border-radius: var(--radius-medium); overflow: hidden; background: var(--code-bg); color: var(--code-ink); }
.codebox .head { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 10px 8px 16px; font: 11px/1 ui-monospace, Menlo, Consolas, monospace; color: #a8a39a; border-bottom: 1px solid rgba(255,255,255,.08); }
.codebox .head .actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.codebox .head button { font: 600 11px/1 "DM Sans", system-ui, sans-serif; color: var(--code-ink); background: transparent; border: 1px solid rgba(255,255,255,.18); border-radius: 100px; padding: 7px 12px; cursor: pointer; transition: border-color var(--transition), background var(--transition); }
.codebox .head button:hover { border-color: rgba(255,255,255,.5); background: rgba(255,255,255,.06); }
.codebox pre { margin: 0; padding: 16px 18px; overflow-x: auto; font: 13.5px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; tab-size: 2; }
.codebox code { background: none; padding: 0; color: inherit; font: inherit; }

.note { border-radius: var(--radius-medium); padding: 16px 18px 16px 48px; margin: 22px 0; position: relative; font-size: 15px; }
.note::before { position: absolute; left: 18px; top: 15px; font-size: 1rem; }
.note.tip { background: var(--accent-soft); }
.note.tip::before { content: "💡"; }
.note.warn { background: var(--warn-soft); }
.note.warn::before { content: "⚠️"; }

.practice { margin-top: 60px; border: 1px solid var(--line); border-radius: var(--radius-large); padding: clamp(24px, 4vw, 40px); background: var(--paper-light); }
.practice h2 { margin-top: 0; }
.practice .goal { font-weight: 600; color: var(--ink); }
.practice ol.steps li { margin-bottom: 10px; }
.practice .checklist { list-style: none; padding: 0; border-top: 1px solid var(--line); }
.practice .checklist li { padding: 12px 0 12px 30px; position: relative; border-bottom: 1px solid var(--line); margin: 0; }
.practice .checklist li::before { content: "↗"; position: absolute; left: 0; top: 12px; color: var(--accent); }

.complete { margin-top: 32px; padding: 28px 30px; border-radius: var(--radius-large); background: var(--accent); color: var(--paper); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; }
.complete strong { color: #fff; font-family: Manrope, sans-serif; font-size: 18px; letter-spacing: -.03em; }
.complete label { display: flex; gap: 12px; align-items: flex-start; font-weight: 500; cursor: pointer; max-width: 520px; color: #dfe6ef; font-size: 15px; }
.complete input { width: 20px; height: 20px; margin-top: 2px; accent-color: #fff; flex: none; }
.complete .btn { background: var(--paper); color: var(--ink); }
.complete .btn:hover { background: #fff; }
.complete .btn:disabled { background: var(--paper); opacity: .4; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; }

/* Examen */
.q { background: var(--paper-light); border: 1px solid var(--line); border-radius: var(--radius-medium); padding: 24px 26px; margin: 16px 0; }
.q legend { font-family: Manrope, sans-serif; font-weight: 700; font-size: 17px; letter-spacing: -.03em; padding: 0; margin-bottom: 12px; float: left; width: 100%; color: var(--ink); }
.q fieldset { border: 0; padding: 0; margin: 0; }
.q .opt { display: flex; gap: 12px; align-items: flex-start; padding: 12px 16px; border: 1px solid var(--line); border-radius: 100px; margin-top: 8px; cursor: pointer; clear: both; font-size: 14px; color: var(--ink-soft); transition: border-color var(--transition); }
.q .opt:hover { border-color: var(--ink); }
.q .opt input { margin-top: 4px; accent-color: var(--accent); }
.q .opt.right { border-color: var(--ok); background: var(--ok-soft); color: var(--ink); }
.q .opt.wrong { border-color: var(--danger); background: var(--danger-soft); color: var(--ink); }
.q .why { margin: 14px 0 0; font-size: 13px; color: var(--muted); }
.result { border-radius: var(--radius-large); padding: 40px 30px; margin: 28px 0; text-align: center; }
.result.pass { background: var(--accent); color: var(--paper); }
.result.pass p { color: #c3cdd9; }
.result.pass strong { color: #fff; }
.result.pass .btn { background: var(--paper); color: var(--ink); }
.result.pass .btn.ghost { background: transparent; color: var(--paper); border-color: rgba(255,255,255,.3); }
.result.fail { background: var(--paper-light); border: 1px solid var(--line); }
.result .score { font-family: Manrope, sans-serif; font-size: 72px; font-weight: 700; letter-spacing: -.06em; line-height: 1; margin: 10px 0 14px; }

/* Móvil */
.menu-toggle { display: none; }
@media (max-width: 950px) {
  .intro-hero, .intro-body { grid-template-columns: 1fr; }
  .side-card { position: static; }
  .checks { grid-template-columns: 1fr; }
  .layout { grid-template-columns: minmax(0, 1fr); } /* minmax evita que el código largo ensanche la página */
  .menu-toggle { display: inline-flex; }
  .sidebar { position: fixed; top: var(--header-h); left: 0; width: min(320px, 88vw); z-index: 15; transform: translateX(-100%); transition: transform .25s; box-shadow: 0 0 40px rgba(37,36,33,.18); }
  .sidebar.open { transform: none; }
  .crumbs { display: none; }
}
@media (max-width: 600px) {
  .syllabus a, .syllabus .locked-row { grid-template-columns: 34px 1fr; }
  .syllabus .right { grid-column: 2; padding-top: 0; }
  .q .opt { border-radius: 14px; }
}

/* ================= Cuenta: barra superior y formularios ================= */
.cuenta { display: flex; align-items: center; gap: 8px; flex: none; }
.cuenta .hola { font-size: 13px; color: var(--ink-soft); white-space: nowrap; }
.cuenta .hola b { color: var(--ink); }
.auth { min-height: calc(100vh - var(--header-h)); display: grid; place-items: center; padding: 48px 16px 80px;
  background: radial-gradient(circle at 80% 20%, rgba(213, 208, 198, .33), transparent 30%), var(--paper); }
.auth-card { width: min(100%, 440px); background: var(--paper-light); border: 1px solid var(--line); border-radius: var(--radius-large); padding: clamp(26px, 5vw, 40px); }
.auth-card h1 { font-size: clamp(30px, 6vw, 40px); margin-bottom: 8px; }
.auth-card .sub { color: var(--ink-soft); margin: 0 0 26px; font-size: 15px; }
.campo { display: grid; gap: 6px; margin-bottom: 16px; }
.campo label { font-size: 13px; font-weight: 700; }
.campo input { font: inherit; font-size: 15px; padding: 12px 16px; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); }
.campo input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.campo input[aria-invalid="true"] { border-color: var(--danger); }
.campo .ayuda { font-size: 12px; color: var(--muted); }
.campo .err { font-size: 12px; color: var(--danger); min-height: 0; }
.auth-card .btn { width: 100%; margin-top: 6px; }
.auth-card .alterno { text-align: center; margin: 20px 0 0; font-size: 14px; color: var(--ink-soft); }
.aviso { border-radius: 12px; padding: 12px 14px; font-size: 14px; margin-bottom: 16px; }
.aviso.error { background: var(--danger-soft); color: var(--danger); }
.aviso.info { background: var(--accent-soft); color: var(--accent); }
.aviso:empty { display: none; }
@media (max-width: 600px) { .cuenta .hola { display: none; } .site-header .crumbs { display: none; } }
.cta-nota { margin: 12px 0 0 !important; font-size: 13px !important; color: #c3cdd9 !important; text-align: center; }
.cta-nota a { color: #fff; }
.side-card button.btn { width: 100%; }

/* Certificados */
.side-card .btn-cert { margin-top: 10px; background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.35); width: 100%; }
.side-card .btn-cert:hover { background: rgba(255,255,255,.08); }
@media (max-width: 760px) { .cuenta .txt-cert { display: none; } }
/* US-153: en celulares angostos (≤ 410 px) el encabezado sin sesión se salía de la pantalla */
@media (max-width: 410px) {
  .site-header nav { gap: 10px; }
  .cuenta { gap: 6px; }
  .cuenta .btn.small { padding: 0 12px; font-size: 11.5px; gap: 6px; }
  .cuenta .btn.small span[aria-hidden] { display: none; }   /* la flecha ↗ de Registrarse */
}
@media (max-width: 350px) {
  .brand span { display: none; }   /* solo el logo; el nombre sigue en su texto alternativo */
}