/* ---------- Tokens ---------- */
:root{
  --ink: #1c1b19;
  --ink-soft: #4a4640;
  --paper: #f7f4ee;
  --paper-raised: #ffffff;
  --line: #ded8c9;
  --navy: #14213d;
  --accent: #14213d;
  --accent-dark: #14213d;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --maxw: 1080px;
}

*{ box-sizing: border-box; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a{ color: inherit; }
img{ max-width: 100%; display: block; }

h1, h2, h3{
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
}

p{ margin: 0 0 1em; max-width: 68ch; }

:focus-visible{
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Header / nav ---------- */
.site-header{
  position: sticky; top: 0; z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header-inner{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand{
  display: flex; align-items: center; gap: 12px;
  text-decoration: none;
}

.nav-toggle{
  display: none;
  background: none; border: none; cursor: pointer;
  width: 40px; height: 40px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span{ width: 22px; height: 2px; background: var(--ink); display: block; }

.site-nav{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}
.nav-link{
  text-decoration: none;
  font-size: 13.5px;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.nav-link:hover{ border-color: var(--line); color: var(--ink); }
.nav-link.is-active{
  background: var(--navy);
  color: #fff;
}
.nav-num{ font-variant-numeric: tabular-nums; opacity: .55; margin-right: 6px; }
.nav-home{ font-weight: 600; }

body[data-accent-slug=""] .nav-link.nav-home{ background: var(--navy); color: #fff; }

@media (max-width: 760px){
  .nav-toggle{ display: flex; }
  .site-nav{
    display: none;
    flex-direction: column;
    padding-top: 6px;
  }
  .site-nav.is-open{ display: flex; }
  .nav-link{ border-radius: 8px; }
}

/* ---------- Footer ---------- */
.site-footer{
  border-top: 1px solid var(--line);
  margin-top: 80px;
  padding: 28px 24px 60px;
  text-align: center;
}
.site-footer p{
  margin: 0 auto;
  max-width: var(--maxw);
  font-size: 13.5px;
  color: var(--ink-soft);
}

/* ---------- Index: hero ---------- */
.hero{
  padding: 72px 24px 20px;
}
.hero-inner{
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero-kicker{
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 17px;
  margin-bottom: 18px;
}
.hero h1{
  font-size: clamp(30px, 5vw, 48px);
  max-width: 16ch;
  letter-spacing: -0.01em;
}
.hero-lede{
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 62ch;
  margin-top: 20px;
}

/* ---------- Lenses ---------- */
.lenses{
  max-width: var(--maxw);
  margin: 56px auto 0;
  padding: 0 24px;
}
.lenses h2{ font-size: 24px; margin-bottom: 24px; }
.lens-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.lens-card{
  background: var(--paper-raised);
  padding: 26px;
}
.lens-card h3{ font-size: 18px; margin-bottom: 10px; }
.lens-card p{ font-size: 15px; color: var(--ink-soft); margin: 0; }

@media (max-width: 700px){
  .lens-grid{ grid-template-columns: 1fr; }
}

/* ---------- Timeline grid (index) ---------- */
.timeline-section{
  max-width: var(--maxw);
  margin: 64px auto 40px;
  padding: 0 24px;
}
.timeline-section h2{ font-size: 24px; }
.section-lede{ color: var(--ink-soft); font-size: 15px; margin-bottom: 28px; }

.tl-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
@media (max-width: 900px){ .tl-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px){ .tl-grid{ grid-template-columns: 1fr; } }

.tl-card{
  position: relative;
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-top: 4px solid var(--card-accent);
  overflow: hidden;
  transition: transform .15s ease, box-shadow .15s ease;
}
.tl-card:hover{ transform: translateY(-3px); box-shadow: 0 10px 24px rgba(20,33,61,.10); }
.tl-num{
  position: absolute; top: 10px; right: 10px;
  font-family: var(--serif); font-size: 12px; color: #fff;
  background: rgba(20,19,17,.55);
  padding: 3px 8px;
  border-radius: 999px;
  z-index: 2;
  backdrop-filter: blur(2px);
}
.tl-thumb{ aspect-ratio: 4/3; overflow: hidden; background: #eee; }
.tl-thumb img{ width: 100%; height: 100%; object-fit: cover; }
.tl-body{ padding: 14px 16px 18px; }
.tl-dates{ font-size: 12.5px; color: var(--ink-soft); }
.tl-body h3{ font-size: 16.5px; margin: 4px 0 2px; line-height: 1.25; }
.card-alt{ font-size: 12.5px; color: var(--ink-soft); font-style: italic; }

/* ---------- Movement page ---------- */
.movement{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px 40px; }

.m-hero{
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0 40px;
  border-bottom: 4px solid var(--accent);
}
.m-num{ font-family: var(--serif); font-style: italic; color: var(--accent-dark); margin-bottom: 6px; }
.m-hero h1{ font-size: clamp(28px, 4vw, 40px); }
.m-alt{ font-size: 16px; color: var(--ink-soft); font-style: italic; margin-top: 2px; }
.m-meta{ font-size: 14.5px; color: var(--ink-soft); margin-top: 10px; }
.m-hero-figure{ margin: 0; }
.m-hero-figure img{ width: 100%; border: 1px solid var(--line); }
.m-hero-figure figcaption{ font-size: 12.5px; color: var(--ink-soft); margin-top: 8px; }

@media (max-width: 760px){
  .m-hero{ grid-template-columns: 1fr; gap: 20px; padding-top: 28px; }
  .m-hero-figure{ order: -1; }
}

.m-lenses{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}
.m-lenses h2{ font-size: 15px; text-transform: none; color: var(--accent-dark); border-bottom: 2px solid var(--accent); display: inline-block; padding-bottom: 4px; margin-bottom: 12px; }
.m-lenses p{ font-size: 15.5px; color: var(--ink-soft); }
@media (max-width: 760px){ .m-lenses{ grid-template-columns: 1fr; gap: 20px; } }

.m-chain{ padding: 40px 0; border-bottom: 1px solid var(--line); }
.m-chain h2{ font-size: 22px; }
.chain-nav{
  display: flex; align-items: stretch; gap: 12px; margin-top: 22px;
  flex-wrap: wrap;
}
.chain-link{
  flex: 1 1 220px;
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 14px 16px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  background: var(--paper-raised);
}
.chain-link:hover{ border-color: var(--accent); }
.chain-label{ display: block; font-family: var(--sans); font-size: 12px; color: var(--ink-soft); margin-bottom: 4px; }
.chain-empty{ flex: 1 1 220px; border: 1px dashed var(--line); padding: 14px 16px; color: var(--ink-soft); font-size: 13px; }
.chain-dot{
  flex: none;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 14px;
  align-self: center;
}
.chain-prev::before, .chain-next::after{ display: none; }

.m-gallery{ padding: 40px 0; border-bottom: 1px solid var(--line); }
.m-gallery h2{ font-size: 22px; margin-bottom: 20px; }
.gallery-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 760px){ .gallery-grid{ grid-template-columns: repeat(2, 1fr); } }
.gallery-item{ margin: 0; cursor: zoom-in; }
.gallery-item img{
  width: 100%; aspect-ratio: 4/5; object-fit: cover;
  border: 1px solid var(--line);
}
.gallery-item figcaption{ font-size: 12px; color: var(--ink-soft); margin-top: 6px; }

.m-infographic{ padding: 40px 0; border-bottom: 1px solid var(--line); }
.m-infographic h2{ font-size: 22px; margin-bottom: 16px; }
.m-infographic img{ width: 100%; border: 1px solid var(--line); cursor: zoom-in; }

.m-figures{ padding: 32px 0; border-bottom: 1px solid var(--line); }
.m-figures h2{ font-size: 18px; }
.m-figures p{ color: var(--ink-soft); font-size: 15.5px; }

.m-video{ padding: 40px 0 20px; }
.m-video h2{ font-size: 22px; margin-bottom: 16px; }
.m-video video{
  width: 100%;
  max-height: 480px;
  background: #000;
  border: 1px solid var(--line);
}
.video-hint{ font-size: 12.5px; color: var(--ink-soft); margin-top: 8px; }
.video-hint code{
  background: var(--paper); border: 1px solid var(--line); padding: 1px 6px; border-radius: 4px;
}
.video-missing-note{ display: none; font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; }
.video-missing video{ display: none; }
.video-missing .video-hint{ display: none; }
.video-missing .video-missing-note{ display: block; }
.video-missing-note code{
  background: var(--paper); border: 1px solid var(--line); padding: 1px 6px; border-radius: 4px;
}

/* ---------- Header extras: logo, school, nav groups ---------- */
.brand-logo{
  height: 52px; width: auto; flex: none;
}
.brand-text{
  display: flex; flex-direction: column;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.3;
  color: var(--ink);
}
.brand-school{
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--navy);
  margin-bottom: 2px;
}
.brand-title{ font-weight: 600; }
.brand-text em{ font-style: italic; color: var(--ink-soft); font-size: 12.5px; }
.nav-sep{
  width: 1px; align-self: stretch; background: var(--line); margin: 4px 6px;
}
.nav-tool{ font-style: italic; }

/* ---------- Index: intro links (3 cards under hero) ---------- */
.intro-links{
  max-width: var(--maxw); margin: 44px auto 0; padding: 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.intro-card{
  text-decoration: none; color: var(--ink);
  border: 1px solid var(--line); border-left: 4px solid var(--navy);
  background: var(--paper-raised);
  padding: 20px 22px;
  transition: border-color .15s ease, transform .15s ease;
}
.intro-card:hover{ border-left-color: #C1272D; transform: translateY(-2px); }
.intro-card h3{ font-size: 17px; margin-bottom: 6px; }
.intro-card p{ font-size: 14px; color: var(--ink-soft); margin: 0; }
@media (max-width: 760px){ .intro-links{ grid-template-columns: 1fr; } }

/* ---------- Generic content page (exam / images / resources) ---------- */
.page-content{ max-width: var(--maxw); margin: 0 auto; padding: 48px 24px 60px; }
.page-header{ max-width: 68ch; margin-bottom: 44px; }
.page-kicker{ font-family: var(--serif); font-style: italic; color: var(--ink-soft); font-size: 16px; margin-bottom: 12px; }
.page-header h1{ font-size: clamp(28px, 4vw, 38px); }
.page-lede{ font-size: 17px; color: var(--ink-soft); margin-top: 14px; }

.exam-section{ padding: 30px 0; border-top: 1px solid var(--line); }
.exam-section:first-of-type{ border-top: none; padding-top: 0; }
.exam-section h2{ font-size: 21px; margin-bottom: 16px; }

.exam-structure{ display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 700px){ .exam-structure{ grid-template-columns: 1fr; } }
.exam-part{ background: var(--paper-raised); border: 1px solid var(--line); border-top: 4px solid var(--navy); padding: 22px 24px; }
.exam-part h3{ font-size: 19px; margin-bottom: 8px; }
.exam-duration{ font-size: 14px; color: var(--ink-soft); margin-bottom: 12px; }
.exam-part ol{ margin: 0; padding-left: 20px; font-size: 15px; }
.exam-part li{ margin-bottom: 8px; }
.exam-note{ margin-top: 18px; font-size: 14.5px; color: var(--ink-soft); }

.criteria-list{ padding-left: 22px; }
.criteria-list li{ margin-bottom: 10px; font-size: 15.5px; }
.criteria-note{ display: block; font-size: 13.5px; color: var(--ink-soft); font-style: italic; }

.rubric-table{ width: 100%; border-collapse: collapse; font-size: 14.5px; }
.rubric-table th, .rubric-table td{ border: 1px solid var(--line); padding: 12px 14px; text-align: left; vertical-align: top; }
.rubric-table th{ background: var(--navy); color: #fff; font-weight: 600; font-family: var(--serif); }
.rubric-table tr:nth-child(even) td{ background: var(--paper-raised); }

.download-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 6px; }
@media (max-width: 700px){ .download-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px){ .download-grid{ grid-template-columns: 1fr; } }
.download-card{
  display: flex; flex-direction: column; gap: 4px;
  text-decoration: none; color: var(--ink);
  border: 1px solid var(--line); background: var(--paper-raised);
  padding: 14px 16px;
}
.download-card:hover{ border-color: var(--navy); }
.dl-label{ font-family: var(--serif); font-size: 15px; font-weight: 600; }
.dl-file{ font-size: 12px; color: var(--ink-soft); word-break: break-all; }

/* ---------- Análisis de imágenes (practice) ---------- */
.practice-grid{
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
@media (max-width: 760px){ .practice-grid{ grid-template-columns: 1fr; } }
.practice-card{
  border: 1px solid var(--line); background: var(--paper-raised);
  display: flex; flex-direction: column;
}
.practice-card img{ width: 100%; aspect-ratio: 4/3; object-fit: cover; cursor: zoom-in; }
.practice-body{ padding: 18px 20px 22px; }
.practice-body h3{ font-size: 16px; margin-bottom: 10px; }
.practice-questions{ font-size: 14px; color: var(--ink-soft); padding-left: 18px; margin: 0 0 12px; }
.practice-questions li{ margin-bottom: 4px; }
.practice-card details{
  border-top: 1px dashed var(--line); padding-top: 10px; font-size: 14px;
}
.practice-card summary{
  cursor: pointer; font-weight: 600; color: var(--accent-dark, var(--navy));
  list-style: none;
}
.practice-card summary::-webkit-details-marker{ display: none; }
.practice-card summary::before{ content: "+ "; }
.practice-card details[open] summary::before{ content: "– "; }
.practice-card details p{ margin: 10px 0 0; color: var(--ink-soft); font-size: 14px; }

/* ---------- Infographics ---------- */
.infographic-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.infographic-grid.worked-examples{ grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px){ .infographic-grid.worked-examples{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 760px){ .infographic-grid{ grid-template-columns: 1fr; } .infographic-grid.worked-examples{ grid-template-columns: 1fr; } }
.infographic-item{ margin: 0; border: 1px solid var(--line); background: var(--paper-raised); padding: 10px; }
.infographic-item img{ width: 100%; cursor: zoom-in; }
.infographic-item figcaption{ font-size: 13px; color: var(--ink-soft); padding: 8px 4px 2px; }
.infographic-full{ max-width: 720px; margin: 0 auto; }

/* ---------- Lock screen (contraseña simple) ---------- */
.lock-screen{
  position: fixed; inset: 0; z-index: 200;
  background: var(--paper);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.lock-screen.is-hidden{ display: none; }
.site-content{ display: none; }
.site-content.is-visible{ display: block; }
.lock-box{
  max-width: 380px; width: 100%;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-top: 4px solid var(--navy);
  padding: 36px 32px;
  text-align: center;
}
.lock-kicker{ font-family: var(--serif); font-style: italic; color: var(--ink-soft); font-size: 15px; margin-bottom: 10px; }
.lock-box h1{ font-size: 24px; margin-bottom: 10px; }
.lock-text{ font-size: 14.5px; color: var(--ink-soft); margin-bottom: 20px; }
.lock-input{
  width: 100%; box-sizing: border-box;
  font-family: var(--sans); font-size: 16px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  margin-bottom: 12px;
}
.lock-input:focus{ outline: 2px solid var(--navy); outline-offset: 1px; }
.lock-button{
  width: 100%; font-family: var(--sans); font-size: 15px; font-weight: 600;
  background: var(--navy); color: #fff; border: none;
  padding: 12px 14px; cursor: pointer;
}
.lock-button:hover{ background: var(--accent-dark, var(--navy)); }
.lock-error{ color: #C1272D; font-size: 13.5px; min-height: 18px; margin: 10px 0 0; }

/* ---------- Lightbox ---------- */
.lightbox{
  position: fixed; inset: 0; background: rgba(20,18,15,.92);
  display: none; align-items: center; justify-content: center;
  padding: 32px; z-index: 100;
}
.lightbox.is-open{ display: flex; }
.lightbox img{ max-width: 100%; max-height: 78vh; }
.lightbox figcaption{ color: #f2f0ea; text-align: center; margin-top: 14px; font-size: 14px; max-width: 60ch; }
.lightbox-close{
  position: absolute; top: 20px; right: 24px;
  background: none; border: none; color: #f2f0ea; font-size: 28px; cursor: pointer;
  line-height: 1;
}