:root {
  --ink: #172026;
  --muted: #53616d;
  --line: #d9dedf;
  --paper: #f8faf7;
  --blue: #006a6a;
  --green: #0b7a55;
  --red: #ba1a1a;
  --yellow: #8a6a00;
  --primary: #006a6a;
  --on-primary: #ffffff;
  --primary-container: #9cf1ef;
  --on-primary-container: #002020;
  --secondary-container: #cce8e7;
  --tertiary-container: #d4e3ff;
  --error-container: #ffdad6;
  --surface: #fbfdfb;
  --surface-container: #eef4f1;
  --surface-container-high: #e8eeeb;
  --outline: #6f7977;
  --soft-blue: #e4f5f3;
  --soft-green: #e6f4ec;
  --soft-red: #ffedea;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, .10), 0 1px 3px rgba(0, 0, 0, .08);
  --shadow-2: 0 2px 6px rgba(0, 0, 0, .12), 0 6px 18px rgba(0, 0, 0, .08);
  --shadow-3: 0 8px 28px rgba(0, 0, 0, .16);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html { scroll-padding-top: 76px; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 100% 0%, rgba(156, 241, 239, .28), transparent 34rem),
    linear-gradient(180deg, #fbfdfb 0%, #f4f8f6 100%);
  line-height: 1.62;
}
body.drawer-open {
  overflow: hidden;
}
a { color: var(--blue); }
.read-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 4px;
  background: transparent;
  z-index: 80;
}
.read-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--green);
}
.mobile-topbar,
.mobile-drawer,
.drawer-backdrop,
.float-top {
  display: none;
}
.icon-button {
  border: 0;
  border-radius: 999px;
  background: var(--secondary-container);
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  padding: 10px 14px;
  min-height: 44px;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  box-shadow: none;
  cursor: pointer;
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}
.icon-button:hover {
  background: var(--primary-container);
  transform: translateY(-1px);
}
.icon-button.compact {
  width: 44px;
  padding: 0;
  font-size: 22px;
}
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 304px;
  padding: 24px 16px;
  background: rgba(251, 253, 251, .92);
  border-right: 1px solid rgba(111, 121, 119, .22);
  backdrop-filter: blur(16px);
  overflow: auto;
}
.brand {
  font-weight: 850;
  margin-bottom: 18px;
  display: grid;
  gap: 10px;
}
.brand img {
  width: 170px;
  height: auto;
  display: block;
}
.brand span {
  color: var(--blue);
  font-size: 13px;
  letter-spacing: .04em;
  text-transform: uppercase;
}
#search {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 13px 16px;
  font-size: 14px;
  margin-bottom: 16px;
  background: var(--surface-container);
  outline: none;
}
#search:focus {
  border-color: var(--primary);
  background: #ffffff;
}
nav { display: grid; gap: 4px; }
nav a {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  min-height: 42px;
  transition: background .16s ease, color .16s ease, transform .16s ease;
}
nav a:hover {
  background: var(--surface-container-high);
  transform: translateX(2px);
}
nav a.active {
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-weight: 850;
}
nav span {
  color: var(--blue);
  font-weight: 800;
  font-size: 12px;
}
main {
  margin-left: 304px;
  padding: 0 0 60px;
}
.hero {
  min-height: 78vh;
  padding: 72px clamp(28px, 6vw, 88px);
  display: grid;
  align-content: center;
  background:
    linear-gradient(110deg, rgba(0,32,32,.94), rgba(0,106,106,.74)),
    url("assets/figura-17-final.svg");
  background-size: cover;
  background-position: center;
  color: white;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  box-shadow: var(--shadow-2);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 13px;
  font-weight: 800;
}
h1 {
  max-width: 920px;
  font-size: clamp(42px, 7vw, 86px);
  line-height: .96;
  margin: 12px 0 18px;
  letter-spacing: 0;
}
.hero p { max-width: 780px; font-size: 20px; }
.hero-logo {
  width: min(310px, 72vw);
  height: auto;
  display: block;
  margin-bottom: 22px;
  filter: drop-shadow(0 12px 28px rgba(0,0,0,.24));
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.hero-actions a {
  color: white;
  border: 1px solid rgba(255,255,255,.32);
  border-radius: 999px;
  padding: 12px 18px;
  text-decoration: none;
  font-weight: 750;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(8px);
  transition: background .16s ease, transform .16s ease;
}
.hero-actions a:hover {
  background: rgba(255,255,255,.22);
  transform: translateY(-1px);
}
.chapter-pager {
  max-width: 980px;
  margin: 12px auto 0;
  padding: 0 clamp(22px, 4vw, 48px) 38px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.chapter-pager a {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px;
  background: var(--secondary-container);
  text-align: center;
  text-decoration: none;
  font-weight: 800;
  color: var(--on-primary-container);
}
.intro, .chapter {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px clamp(22px, 4vw, 48px);
}
.intro h2, .chapter h2 {
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.05;
  margin: 0 0 14px;
  letter-spacing: 0;
}
.chapter h3 {
  font-size: 23px;
  margin: 34px 0 10px;
  color: var(--blue);
}
.chapter h4 { margin: 0 0 8px; }
.chapter-cover {
  background: linear-gradient(135deg, var(--surface-container), #ffffff);
  border: 1px solid rgba(111, 121, 119, .24);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-1);
}
.part {
  color: var(--blue);
  font-weight: 850;
  margin: 0 0 8px;
}
.panel, .mentor, .pro, .rule {
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 22px 0;
  box-shadow: var(--shadow-1);
}
.objectives { background: var(--soft-green); }
.mentor { background: var(--soft-blue); }
.pro { background: #fff5d6; }
.rule { background: var(--soft-red); }
.industrial-note {
  border: 1px solid rgba(11, 122, 85, .22);
  border-left: 8px solid var(--green);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 22px 0;
  background: #f1f8f3;
  box-shadow: var(--shadow-1);
}
.industrial-note h3 { margin-top: 0; color: var(--green); }
.industrial-note.safety {
  border-color: #e7c9a3;
  border-left-color: var(--yellow);
  background: #fff8e7;
}
.industrial-note.safety h3 { color: #8a6412; }
.workshop {
  background: #ffffff;
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 28px 0;
  box-shadow: var(--shadow-1);
}
.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.timeline div {
  border: 1px solid rgba(111, 121, 119, .18);
  border-radius: var(--radius-md);
  padding: 12px;
  background: var(--surface-container);
  min-height: 138px;
}
.timeline strong {
  display: block;
  margin-bottom: 8px;
  color: var(--blue);
}
.timeline span {
  display: block;
  font-size: 13px;
  line-height: 1.45;
}
figure.diagram {
  margin: 24px 0;
  padding: 0;
}
figure.diagram img {
  width: 100%;
  height: auto;
  display: block;
}
figcaption {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  margin-top: 8px;
}
pre {
  background: #eef4f1;
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 16px;
  overflow: auto;
  font-size: 13px;
  line-height: 1.5;
}
.compare, .exercise-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.concept-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0;
}
.concept-grid > div {
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 16px;
  background: #ffffff;
  box-shadow: var(--shadow-1);
}
.concept-grid h3 { margin-top: 0; }
.compare.wide {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.primer .chapter-cover {
  background: linear-gradient(135deg, var(--primary-container), #ffffff);
}
.primer-diagram svg {
  max-width: 100%;
  height: auto;
  display: block;
}
.exercise-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.compare > div, .exercise-grid > div {
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 16px;
  background: #fff;
  box-shadow: var(--shadow-1);
}
table {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0 24px;
  background: #fff;
}
section:has(table) {
  overflow-x: auto;
}
th, td {
  border: 1px solid rgba(111, 121, 119, .20);
  padding: 10px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}
th { background: var(--secondary-container); }
.checklist {
  display: grid;
  gap: 10px;
  background: var(--soft-green);
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-1);
}
.checklist h3 { margin-top: 0; }
.checklist label { display: flex; gap: 10px; align-items: flex-start; }
.refs {
  columns: 2;
  gap: 28px;
}
.prompt-category { margin-top: 34px; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.download-grid a {
  display: block;
  border: 1px solid rgba(111, 121, 119, .22);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: #ffffff;
  text-decoration: none;
  font-weight: 750;
  box-shadow: var(--shadow-1);
  transition: background .16s ease, transform .16s ease, box-shadow .16s ease;
}
.download-grid a:hover {
  background: var(--primary-container);
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}
.glossary {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 10px 18px;
}
.glossary dt { font-weight: 850; color: var(--blue); }
.glossary dd { margin: 0; }
.hidden-by-search { display: none; }

@media (max-width: 900px) {
  html { scroll-padding-top: 84px; }
  body { padding-top: 62px; }
  .read-progress { top: 0; }
  .mobile-topbar {
    position: fixed;
    inset: 8px 8px auto 8px;
    z-index: 70;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 8px;
    align-items: center;
    padding: 8px;
    background: rgba(251, 253, 251, .92);
    border: 1px solid rgba(111, 121, 119, .18);
    border-radius: 999px;
    box-shadow: var(--shadow-2);
    backdrop-filter: blur(14px);
  }
  .mobile-title {
    color: var(--ink);
    font-weight: 900;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    display: flex;
    justify-content: center;
    min-width: 0;
  }
  .mobile-title img {
    width: min(148px, 42vw);
    height: auto;
    display: block;
  }
  .drawer-backdrop {
    position: fixed;
    inset: 0;
    display: block;
    background: rgba(23, 32, 38, .38);
    z-index: 88;
  }
  .drawer-backdrop[hidden] { display: none; }
  .mobile-drawer {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 90;
    display: grid;
    grid-template-rows: auto auto 1fr;
    width: min(88vw, 390px);
    padding: 18px;
    background: var(--surface);
    border-right: 1px solid rgba(111, 121, 119, .22);
    box-shadow: 0 18px 50px rgba(23, 32, 38, .24);
    transform: translateX(-104%);
    transition: transform .2s ease;
  }
  .mobile-drawer.open { transform: translateX(0); }
  .drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
  }
  #mobile-search {
    width: 100%;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 13px 16px;
    font-size: 16px;
    margin-bottom: 12px;
    background: var(--surface-container);
    outline: none;
  }
  #mobile-search:focus {
    border-color: var(--primary);
    background: #ffffff;
  }
  .mobile-nav {
    overflow: auto;
    padding-bottom: 22px;
  }
  .mobile-nav a {
    min-height: 44px;
    font-size: 14px;
  }
  .sidebar {
    display: none;
  }
  main { margin-left: 0; }
  .hero {
    min-height: 62vh;
    padding: 42px 20px 32px;
  }
  h1 {
    font-size: clamp(38px, 13vw, 58px);
    line-height: 1;
  }
  .hero p { font-size: 17px; }
  .hero-logo {
    width: min(240px, 68vw);
    margin-bottom: 18px;
  }
  .hero-actions a {
    flex: 1 1 100%;
    text-align: center;
  }
  .intro, .chapter {
    padding: 34px 18px;
  }
  .chapter-cover {
    padding: 22px;
  }
  .intro h2, .chapter h2 {
    font-size: clamp(28px, 10vw, 40px);
  }
  .chapter h3 {
    font-size: 20px;
    margin-top: 28px;
  }
  figure.diagram {
    margin: 18px -6px;
    overflow-x: auto;
  }
  figure.diagram img {
    min-width: 620px;
    max-width: none;
  }
  figcaption {
    padding: 0 8px;
  }
  pre {
    font-size: 12px;
    padding: 13px;
  }
  th, td {
    font-size: 13px;
    min-width: 160px;
  }
  table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }
  .chapter-pager {
    position: sticky;
    bottom: 0;
    z-index: 60;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    background: rgba(251,253,251,.92);
    border-top: 1px solid rgba(111, 121, 119, .18);
    backdrop-filter: blur(14px);
  }
  .chapter-pager a {
    padding: 11px 6px;
    font-size: 13px;
    background: var(--surface-container);
  }
  .float-top {
    position: fixed;
    right: 14px;
    bottom: 74px;
    z-index: 75;
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--primary);
    color: #ffffff;
    font-size: 22px;
    font-weight: 900;
    box-shadow: 0 10px 28px rgba(23,32,38,.22);
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity .18s ease, transform .18s ease;
  }
  .float-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .compare, .compare.wide, .concept-grid, .exercise-grid, .glossary, .timeline, .download-grid { grid-template-columns: 1fr; }
  .refs { columns: 1; }
}

@media print {
  .sidebar, .mobile-topbar, .mobile-drawer, .drawer-backdrop, .float-top, .chapter-pager, .hero-actions, #search { display: none; }
  main { margin: 0; }
  .hero { min-height: auto; color: var(--ink); background: none; border-bottom: 1px solid var(--line); }
  .chapter { break-before: page; max-width: none; }
  a { color: var(--ink); }
}

/* Editorial professional redesign */
:root {
  --ink: #13201b;
  --muted: #5f6f68;
  --line: #dce5e0;
  --primary: #0f7a53;
  --primary-dark: #07583a;
  --primary-soft: #e8f5ef;
  --surface: #fbfcfb;
  --surface-raised: #ffffff;
  --surface-muted: #f2f6f3;
  --warning-soft: #fff7df;
  --danger-soft: #fff0ed;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-soft: 0 10px 30px rgba(10, 32, 24, .08);
  --shadow-card: 0 1px 2px rgba(10, 32, 24, .06), 0 8px 24px rgba(10, 32, 24, .06);
}

body {
  background: var(--surface);
  color: var(--ink);
  font-size: 16px;
}

.read-progress span {
  background: var(--primary);
}

.sidebar {
  width: 318px;
  padding: 28px 18px;
  background: #ffffff;
  border-right: 1px solid var(--line);
  box-shadow: none;
}

.brand {
  margin-bottom: 22px;
  padding: 0 8px 18px;
  border-bottom: 1px solid var(--line);
}

.brand img {
  width: 172px;
}

.brand span {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
}

#search,
#mobile-search {
  background: var(--surface-muted);
  border: 1px solid transparent;
  border-radius: 12px;
  box-shadow: none;
}

#search:focus,
#mobile-search:focus {
  border-color: var(--primary);
  background: #ffffff;
}

nav {
  gap: 2px;
}

nav a {
  border-radius: 10px;
  min-height: 38px;
  padding: 8px 10px;
  color: #26352f;
  font-weight: 600;
}

nav a:hover {
  transform: none;
  background: var(--surface-muted);
}

nav a.active {
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 800;
}

nav span {
  color: var(--primary);
}

main {
  margin-left: 318px;
  padding-bottom: 72px;
}

.hero {
  min-height: auto;
  margin: 28px auto 0;
  max-width: 1080px;
  padding: 56px clamp(28px, 5vw, 68px);
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(255,255,255,.98), rgba(232,245,239,.96)),
    url("assets/figura-17-final.svg");
  background-size: cover;
  background-position: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.eyebrow {
  color: var(--primary-dark);
  letter-spacing: .09em;
}

.hero-logo {
  width: min(280px, 70vw);
  filter: none;
}

h1 {
  max-width: 760px;
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.02;
  color: var(--ink);
}

.hero p {
  max-width: 760px;
  color: #33423c;
  font-size: 18px;
}

.hero-actions a {
  color: var(--primary-dark);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 15px;
  box-shadow: none;
}

.hero-actions a:hover {
  background: var(--primary-soft);
  transform: none;
}

.intro,
.chapter {
  max-width: 900px;
  padding: 44px clamp(24px, 4vw, 46px);
}

.intro h2,
.chapter h2 {
  max-width: 760px;
  font-size: clamp(32px, 4vw, 48px);
}

.chapter h3 {
  color: var(--primary-dark);
}

.chapter-cover {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.part {
  color: var(--primary);
}

.panel,
.mentor,
.pro,
.rule,
.industrial-note,
.workshop,
.compare > div,
.exercise-grid > div,
.concept-grid > div,
.checklist,
.download-grid a {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: none;
}

.objectives,
.mentor {
  background: var(--primary-soft);
}

.pro,
.industrial-note.safety {
  background: var(--warning-soft);
}

.rule,
.errors table {
  background: var(--danger-soft);
}

.industrial-note {
  background: #f1f8f4;
  border-left: 5px solid var(--primary);
}

.timeline div,
pre {
  background: var(--surface-muted);
  border-color: var(--line);
}

th {
  background: var(--primary-soft);
}

figure.diagram {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px;
}

.chapter-pager {
  max-width: 900px;
}

.chapter-pager a,
.icon-button {
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid var(--line);
  color: var(--primary-dark);
  box-shadow: none;
}

.chapter-pager a:hover,
.icon-button:hover {
  background: var(--primary-soft);
  transform: none;
}

.float-top {
  background: var(--primary);
  box-shadow: var(--shadow-soft);
}

@media (max-width: 900px) {
  body {
    padding-top: 58px;
    background: #ffffff;
  }

  .mobile-topbar {
    inset: 0 0 auto 0;
    border-radius: 0;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,.97);
    box-shadow: none;
    padding: 8px 12px;
  }

  .icon-button {
    min-height: 40px;
    padding: 8px 11px;
    font-size: 13px;
  }

  .icon-button span:first-child {
    display: none;
  }

  .icon-button.compact span:first-child {
    display: inline;
  }

  .mobile-title img {
    width: min(138px, 40vw);
  }

  .mobile-drawer {
    width: 100vw;
    max-width: none;
    padding: 18px 18px 28px;
    border-right: 0;
    box-shadow: none;
  }

  .drawer-head {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
  }

  .mobile-nav a {
    min-height: 46px;
    border-radius: 10px;
  }

  .hero {
    margin: 0;
    border-radius: 0 0 22px 22px;
    border-left: 0;
    border-right: 0;
    border-top: 0;
    box-shadow: none;
    padding: 34px 20px 28px;
  }

  .hero-logo {
    width: min(210px, 64vw);
  }

  h1 {
    font-size: clamp(34px, 11vw, 48px);
  }

  .hero p {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
  }

  .intro,
  .chapter {
    padding: 30px 18px;
  }

  .chapter-cover {
    padding: 20px;
  }

  figure.diagram {
    margin: 18px 0;
    padding: 8px;
  }

  figure.diagram img {
    min-width: 560px;
  }

  .chapter-pager {
    grid-template-columns: 1fr 1fr 1fr;
    padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
    background: rgba(255,255,255,.98);
    box-shadow: 0 -8px 24px rgba(10, 32, 24, .08);
  }

  .chapter-pager a {
    border-radius: 10px;
    background: #ffffff;
    font-size: 12px;
  }

  .float-top {
    right: 12px;
    bottom: 68px;
    width: 42px;
    height: 42px;
  }
}

/* Mobile repair: clean reader experience */
@media (max-width: 900px) {
  html {
    scroll-padding-top: 64px;
  }

  body {
    padding-top: 56px;
    background: #fbfcfb;
    font-size: 16px;
    line-height: 1.58;
  }

  .read-progress {
    height: 3px;
    z-index: 120;
  }

  .mobile-topbar {
    inset: 0;
    height: 56px;
    display: grid;
    grid-template-columns: 78px 1fr 44px;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, .98);
    border: 0;
    border-bottom: 1px solid #e1e8e4;
    border-radius: 0;
    box-shadow: 0 2px 12px rgba(12, 32, 24, .06);
    backdrop-filter: blur(12px);
  }

  .mobile-title img {
    width: 132px;
    max-width: 100%;
  }

  .icon-button {
    min-height: 38px;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: #0b5f41;
    padding: 7px 8px;
    font-size: 13px;
    box-shadow: none;
  }

  .icon-button:hover {
    background: #e8f5ef;
  }

  .icon-button.compact {
    width: 38px;
    font-size: 18px;
  }

  .drawer-backdrop {
    background: rgba(8, 24, 18, .28);
  }

  .mobile-drawer {
    width: 100vw;
    max-width: none;
    padding: 18px 18px 30px;
    background: #fbfcfb;
    box-shadow: none;
    border: 0;
  }

  .drawer-head {
    margin: 0 0 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid #dce5e0;
  }

  .drawer-head strong {
    font-size: 22px;
    letter-spacing: 0;
  }

  #mobile-search {
    border-radius: 12px;
    background: #eef5f1;
    padding: 12px 14px;
    margin-bottom: 12px;
  }

  .mobile-nav {
    display: grid;
    gap: 3px;
  }

  .mobile-nav a {
    min-height: 44px;
    border-radius: 10px;
    padding: 9px 10px;
    font-size: 14px;
    background: transparent;
  }

  .mobile-nav a.active {
    background: #e8f5ef;
  }

  main {
    margin-left: 0;
    padding-bottom: 24px;
  }

  .hero {
    margin: 0;
    padding: 30px 20px 28px;
    min-height: auto;
    color: #13201b;
    background: linear-gradient(180deg, #ffffff 0%, #edf7f1 100%);
    border: 0;
    border-bottom: 1px solid #dce5e0;
    border-radius: 0;
    box-shadow: none;
  }

  .eyebrow {
    font-size: 11px;
    line-height: 1.4;
    color: #0b5f41;
  }

  .hero-logo {
    width: 190px;
    margin: 8px 0 18px;
  }

  h1 {
    font-size: clamp(34px, 11vw, 46px);
    line-height: 1.03;
    margin: 8px 0 14px;
  }

  .hero p {
    font-size: 16px;
    line-height: 1.55;
    color: #35443e;
  }

  .hero-actions {
    display: grid;
    gap: 8px;
    margin-top: 18px;
  }

  .hero-actions a {
    display: block;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid #cfdad4;
    background: #ffffff;
    color: #07583a;
    font-weight: 800;
    text-align: center;
  }

  .intro,
  .chapter {
    max-width: none;
    padding: 28px 18px;
  }

  .intro h2,
  .chapter h2 {
    font-size: clamp(28px, 9vw, 38px);
    line-height: 1.08;
  }

  .chapter h3 {
    font-size: 20px;
    line-height: 1.2;
    margin-top: 26px;
  }

  .chapter-cover,
  .panel,
  .mentor,
  .pro,
  .rule,
  .industrial-note,
  .workshop,
  .compare > div,
  .exercise-grid > div,
  .concept-grid > div,
  .checklist,
  .download-grid a {
    border-radius: 14px;
    box-shadow: none;
  }

  .chapter-cover {
    padding: 20px;
    margin-bottom: 22px;
  }

  figure.diagram {
    margin: 18px 0;
    padding: 8px;
    overflow: hidden;
    border-radius: 14px;
  }

  figure.diagram img {
    width: 100%;
    min-width: 0;
    max-width: 100%;
    height: auto;
  }

  .primer-diagram svg {
    width: 100%;
    height: auto;
  }

  figcaption {
    font-size: 12px;
    line-height: 1.4;
    padding: 0 4px;
  }

  .timeline,
  .compare,
  .compare.wide,
  .concept-grid,
  .exercise-grid,
  .glossary,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .timeline div {
    min-height: auto;
  }

  pre {
    font-size: 12px;
    line-height: 1.45;
    border-radius: 12px;
  }

  table {
    display: block;
    overflow-x: auto;
    border-radius: 12px;
  }

  th,
  td {
    font-size: 13px;
    min-width: 150px;
  }

  .chapter-pager {
    display: none;
  }

  .float-top {
    right: 14px;
    bottom: 18px;
    width: 42px;
    height: 42px;
    border: 0;
    background: #0f7a53;
    box-shadow: 0 6px 20px rgba(15, 122, 83, .24);
  }
}

/* INSECE pro app skin */
:root {
  --ink: #0e1f18;
  --muted: #60736b;
  --line: #d7e4de;
  --primary: #10b981;
  --primary-dark: #047857;
  --primary-deep: #064e3b;
  --primary-soft: #d1fae5;
  --app-bg: #f3f8f5;
  --app-dark: #062d23;
  --accent: #38bdf8;
  --pro-shadow: 0 14px 40px rgba(6, 78, 59, .14);
  --pro-shadow-soft: 0 6px 24px rgba(6, 78, 59, .10);
}

body {
  background:
    radial-gradient(circle at 100% 0, rgba(16, 185, 129, .16), transparent 28rem),
    linear-gradient(180deg, #f7fbf8 0%, var(--app-bg) 100%);
  color: var(--ink);
}

.read-progress span {
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.sidebar {
  background: linear-gradient(180deg, #ffffff 0%, #f7fbf8 100%);
  border-right: 1px solid rgba(4, 120, 87, .18);
}

.brand {
  border-bottom-color: rgba(4, 120, 87, .18);
}

.brand span {
  color: var(--primary-dark);
  font-weight: 900;
}

#search,
#mobile-search {
  background: #ffffff;
  border: 1px solid rgba(4, 120, 87, .18);
}

#search:focus,
#mobile-search:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, .14);
}

nav a:hover {
  background: rgba(16, 185, 129, .10);
  border-color: rgba(16, 185, 129, .18);
}

nav a.active {
  background: linear-gradient(135deg, var(--primary-soft), #ffffff);
  border-color: rgba(16, 185, 129, .32);
  color: var(--primary-deep);
  box-shadow: 0 4px 16px rgba(16, 185, 129, .12);
}

nav span,
.part,
.chapter h3,
.glossary dt {
  color: var(--primary-dark);
}

.hero {
  color: #ffffff;
  background:
    linear-gradient(135deg, rgba(6, 78, 59, .96), rgba(4, 120, 87, .88)),
    url("assets/figura-17-final.svg");
  border: 0;
  box-shadow: var(--pro-shadow);
}

.eyebrow,
.hero p,
.hero h1 {
  color: #ffffff;
}

.hero p {
  color: rgba(255,255,255,.88);
}

.hero-logo {
  background: rgba(255,255,255,.92);
  border-radius: 14px;
  padding: 10px 14px;
  box-shadow: 0 14px 34px rgba(0,0,0,.16);
}

.hero-actions a {
  background: #ffffff;
  border: 0;
  color: var(--primary-deep);
  box-shadow: 0 8px 22px rgba(0,0,0,.14);
}

.hero-actions a:hover {
  background: var(--primary-soft);
}

.chapter-cover,
.panel,
.mentor,
.pro,
.rule,
.industrial-note,
.workshop,
.compare > div,
.exercise-grid > div,
.concept-grid > div,
.checklist,
.download-grid a,
figure.diagram {
  border-color: rgba(4, 120, 87, .16);
  box-shadow: 0 1px 2px rgba(6, 78, 59, .04), 0 8px 22px rgba(6, 78, 59, .05);
}

.objectives,
.mentor,
.checklist {
  background: linear-gradient(135deg, #ecfdf5, #ffffff);
}

.industrial-note {
  border-left-color: var(--primary);
}

th {
  background: #d1fae5;
  color: var(--primary-deep);
}

.chapter-pager a,
.icon-button {
  background: var(--primary-deep);
  border-color: var(--primary-deep);
  color: #ffffff;
}

.chapter-pager a:hover,
.icon-button:hover {
  background: var(--primary-dark);
}

.float-top {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 12px 30px rgba(16, 185, 129, .32);
}

@media (max-width: 900px) {
  body {
    background: #f6fbf8;
  }

  .mobile-topbar {
    background: linear-gradient(135deg, var(--app-dark), var(--primary-dark));
    border-bottom: 0;
    box-shadow: 0 8px 26px rgba(6, 78, 59, .22);
  }

  .mobile-title img {
    background: rgba(255,255,255,.96);
    border-radius: 10px;
    padding: 5px 8px;
  }

  .mobile-topbar .icon-button {
    color: #ffffff;
    background: rgba(255,255,255,.12);
  }

  .mobile-topbar .icon-button:hover {
    background: rgba(255,255,255,.20);
  }

  .mobile-drawer {
    background: linear-gradient(180deg, #ffffff 0%, #f1fbf6 100%);
  }

  .drawer-head strong {
    color: var(--primary-deep);
  }

  .mobile-nav a.active {
    background: var(--primary-soft);
    color: var(--primary-deep);
  }

  .hero {
    color: #ffffff;
    background:
      linear-gradient(135deg, rgba(6, 78, 59, .98), rgba(4, 120, 87, .90)),
      url("assets/figura-17-final.svg");
    border-bottom: 0;
  }

  .hero-logo {
    background: rgba(255,255,255,.95);
    border-radius: 12px;
    padding: 8px 10px;
  }

  .hero p,
  .hero h1,
  .eyebrow {
    color: #ffffff;
  }

  .hero p {
    color: rgba(255,255,255,.90);
  }

  .hero-actions a {
    background: #ffffff;
    border: 0;
    color: var(--primary-deep);
    box-shadow: 0 6px 18px rgba(0,0,0,.13);
  }

  .chapter-cover,
  .panel,
  .mentor,
  .pro,
  .rule,
  .industrial-note,
  .workshop,
  .compare > div,
  .exercise-grid > div,
  .concept-grid > div,
  .checklist,
  .download-grid a,
  figure.diagram {
    background-color: #ffffff;
    box-shadow: 0 1px 2px rgba(6, 78, 59, .04), 0 6px 18px rgba(6, 78, 59, .05);
  }

  .objectives,
  .mentor,
  .checklist {
    background: #ecfdf5;
  }
}