:root {
  --petrol: #123F46;
  --petrol-soft: #1B525A;
  --night: #17252B;
  --sage: #7F9D92;
  --sage-light: #B4C6BC;
  --sage-deep: #47665C;
  --sage-tint: #E8EBE3;
  --champagne: #C7B58A;
  --ivory: #F7F4EE;
  --line: #DAD6CB;
  --ink: #17252B;
  --ink-soft: #4A5A5E;
  --display: "Manrope", system-ui, sans-serif;
  --body: "DM Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ivory); color: var(--ink); font: 400 1.0625rem/1.6 var(--body); }
h1, h2, h3 { font-family: var(--display); margin: 0; letter-spacing: -0.02em; text-wrap: balance; }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); line-height: 1.12; font-weight: 700; }
h3 { font-weight: 700; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--champagne); outline-offset: 3px; }

.wrap { width: min(1160px, 100% - 40px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--night); color: #fff; padding: 8px 14px; z-index: 30; }
.skip:focus { left: 8px; }

.review-bar { background: var(--champagne); color: var(--night); font-size: .875rem; padding: 8px 20px; text-align: center; }
.review-bar code { font-size: .85em; }

/* Logo */
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--petrol); }
.logo-img { display: block; height: 54px; width: auto; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--ivory); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 20px; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a:not(.btn) { text-decoration: none; font-weight: 500; font-size: .975rem; }
.nav a:not(.btn):hover { color: var(--sage-deep); }
.nav-toggle { display: none; background: none; border: 1px solid var(--petrol); color: var(--petrol); border-radius: 4px; padding: 8px 14px; font: 600 .9rem var(--body); cursor: pointer; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border-radius: 4px; border: 1px solid transparent; font: 600 1rem var(--body); text-decoration: none; cursor: pointer; transition: background-color .18s, color .18s, border-color .18s; }
.btn-sm { min-height: 42px; padding: 0 18px; font-size: .95rem; }
.btn-solid { background: var(--petrol); color: var(--ivory); }
.btn-solid:hover { background: var(--petrol-soft); }
.btn-light { background: var(--ivory); color: var(--petrol); }
.btn-light:hover { background: var(--champagne); color: var(--night); }
.btn-ghost { border-color: rgba(247, 244, 238, .45); color: var(--ivory); }
.btn-ghost:hover { border-color: var(--ivory); background: rgba(247, 244, 238, .08); }

/* Hero */
.hero { background: var(--petrol); color: var(--ivory); padding-top: clamp(48px, 8vw, 96px); }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(32px, 6vw, 72px); align-items: center; }
.eyebrow { font: 600 .8rem var(--display); letter-spacing: .14em; text-transform: uppercase; color: var(--champagne); margin-bottom: 16px; }
.eyebrow-dark { color: var(--sage-deep); }
h1 { font-size: clamp(2.9rem, 7.2vw, 5.4rem); line-height: 1.02; font-weight: 800; letter-spacing: -0.035em; }
.lede { font-size: clamp(1.1rem, 1.6vw, 1.25rem); max-width: 34em; margin-top: 24px; color: #DCE5E0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.stairs { display: grid; grid-template-columns: repeat(4, 1fr); align-items: end; gap: clamp(8px, 1.2vw, 14px); height: clamp(280px, 34vw, 400px); }
.stair { display: flex; align-items: flex-end; padding: 0 0 18px clamp(12px, 1.6vw, 20px); text-decoration: none; font: 700 clamp(1rem, 1.7vw, 1.3rem) var(--display); letter-spacing: -0.01em; white-space: nowrap; clip-path: polygon(0 34px, 100% 0, 100% 100%, 0 100%); transition: filter .18s; }
.stair span { writing-mode: vertical-rl; transform: rotate(180deg); }
.stair:hover { filter: brightness(1.08); }
.stair:focus-visible { outline: none; filter: brightness(1.2); text-decoration: underline; }
.stair-1 { height: 58%; background: var(--sage-deep); color: var(--ivory); }
.stair-2 { height: 70%; background: var(--sage); color: var(--night); }
.stair-3 { height: 85%; background: var(--sage-light); color: var(--night); }
.stair-4 { height: 100%; background: var(--champagne); color: var(--night); }

.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: clamp(48px, 7vw, 80px); padding: 28px 0 32px; border-top: 1px solid rgba(247, 244, 238, .2); }
.facts b { display: block; font: 700 1rem var(--display); }
.facts span { display: block; font-size: .925rem; color: #BFCFC9; margin-top: 2px; }

/* Sections */
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section-dark { background: var(--night); color: var(--ivory); }
.section-tint { background: var(--sage-tint); }
.section-head { max-width: 680px; margin-bottom: clamp(36px, 5vw, 60px); }
.section-head > p:last-child:not(.eyebrow) { margin-top: 16px; color: var(--ink-soft); }

/* Catalog */
.area { display: grid; grid-template-columns: 240px 1fr; gap: 32px; padding: 28px 0; border-top: 1px solid var(--petrol); }
.area-name { font-size: 1rem; color: var(--petrol); padding-top: 4px; letter-spacing: -0.01em; }
.course-list { display: grid; }
.course + .course { border-top: 1px solid var(--line); }
.course-title { font: 700 clamp(1.15rem, 2vw, 1.4rem) var(--display); letter-spacing: -0.015em; color: var(--night); }
.course-row { display: grid; grid-template-columns: 1fr auto 150px; align-items: center; gap: 20px; padding: 16px 0; }
.area .course-list > .course:first-child { padding-top: 0; }
.course-row p { font-size: .975rem; color: var(--ink-soft); }
.course-row .link { justify-self: end; }
.tag { display: inline-block; font: 600 .78rem var(--body); padding: 3px 10px; border-radius: 3px; background: var(--petrol); color: var(--ivory); white-space: nowrap; }
.tag-muted { background: none; color: var(--sage-deep); border: 1px solid var(--sage-light); }
.link { font-weight: 600; color: var(--petrol); text-underline-offset: 4px; text-decoration-color: var(--champagne); text-decoration-thickness: 2px; }
.link:hover { color: var(--sage-deep); }

details.course { padding: 16px 0; }
.area .course-list > details.course:first-child { padding-top: 0; }
details.course summary { display: flex; align-items: center; gap: 14px; cursor: pointer; list-style: none; }
details.course summary::-webkit-details-marker { display: none; }
details.course summary::after { content: "+"; margin-left: auto; font: 500 1.5rem/1 var(--display); color: var(--petrol); }
details.course[open] summary::after { content: "–"; }
.course-body { padding-top: 16px; display: grid; gap: 20px; justify-items: start; }
.course-body > p { color: var(--ink-soft); max-width: 42em; }
.check-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 32px; width: 100%; }
.check-list li { position: relative; padding-left: 20px; font-size: 1rem; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 6px; background: var(--champagne); clip-path: polygon(25% 0, 100% 0, 75% 100%, 0 100%); }

.ladder { width: 100%; background: var(--sage-tint); padding: 20px; border-radius: 4px; }
.ladder-title { font: 700 1rem var(--display); color: var(--petrol); margin-bottom: 12px; }
.ladder ol { display: flex; flex-wrap: wrap; gap: 6px 22px; counter-reset: none; }
.ladder li { position: relative; font-weight: 500; font-size: .95rem; }
.ladder li:not(.is-end)::after { content: "→"; position: absolute; right: -17px; color: var(--sage-deep); }
.ladder .is-end { font-weight: 700; color: var(--petrol); }
.ladder-note { font-size: .925rem; color: var(--ink-soft); margin-top: 10px; }

/* Method: ascending */
.climb { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 40px); align-items: end; }
.climb-bar { display: block; height: 14px; margin-bottom: 20px; clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%); }
.climb-1 .climb-bar { background: var(--sage-deep); }
.climb-2 .climb-bar { background: var(--sage); }
.climb-3 .climb-bar { background: var(--champagne); }
.climb-1 { padding-bottom: 0; }
.climb-2 { padding-bottom: 56px; }
.climb-3 { padding-bottom: 112px; }
.climb h3 { font-size: 1.5rem; margin-bottom: 8px; }
.climb p { color: #C9D4D0; max-width: 30em; }

/* Split sections */
.split { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.split h2 + p { margin-top: 16px; }
#certificado .split > div:first-child p:not(.eyebrow) { color: var(--ink-soft); }

.compare { display: grid; grid-template-columns: 1fr 1fr; border-top: 2px solid var(--petrol); }
.compare-col { padding: 22px 24px 0 0; }
.compare-no { padding-left: 24px; padding-right: 0; border-left: 1px solid var(--line); }
.compare h3 { font-size: 1.1rem; margin-bottom: 14px; color: var(--petrol); }
.compare li { padding: 10px 0; border-top: 1px solid var(--line); font-size: 1rem; }
.compare-no li { color: var(--ink-soft); }

/* Areas */
.areas-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(24px, 4vw, 48px); }
.areas-grid article { border-top: 1px solid var(--petrol); padding-top: 18px; }
.areas-grid h3 { font-size: 1.35rem; margin: 12px 0 8px; }
.areas-grid p { color: var(--ink-soft); }
.status { font: 600 .78rem var(--body); color: var(--sage-deep); }
.status-on { color: var(--petrol); font-weight: 700; }

/* Contact */
.contact { background: var(--petrol); }
.contact h2 + p { color: #DCE5E0; }
.contact-links { margin-top: 24px; display: grid; gap: 6px; }
.contact-links a { color: var(--ivory); font-weight: 500; text-underline-offset: 4px; text-decoration-color: var(--champagne); }
.form { display: grid; gap: 6px; background: rgba(247, 244, 238, .07); padding: clamp(20px, 3vw, 32px); border-radius: 4px; }
.form label { font-weight: 600; font-size: .95rem; margin-top: 10px; }
.form label:first-child { margin-top: 0; }
.optional { font-weight: 400; color: #BFCFC9; }
.form input, .form select, .form textarea { width: 100%; min-height: 48px; padding: 10px 12px; border: 1px solid transparent; border-radius: 4px; background: var(--ivory); color: var(--ink); font: 400 1rem var(--body); }
.form textarea { resize: vertical; }
.form [aria-invalid="true"] { border-color: var(--champagne); box-shadow: 0 0 0 2px var(--champagne); }
.form .btn { margin-top: 16px; width: 100%; }
.form-note { font-size: .875rem; color: #BFCFC9; margin-top: 10px; }
.form-note a { color: inherit; }
.form-status { font-size: .95rem; font-weight: 500; color: var(--champagne); }
.form-status:not(:empty) { margin-top: 8px; }

/* Footer */
.site-footer { padding: 32px 0; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 32px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-left: auto; font-size: .925rem; }
.copyright { font-size: .875rem; color: var(--ink-soft); }

/* Legal page */
.legal { padding: clamp(40px, 7vw, 72px) 0 96px; }
.legal-inner { max-width: 720px; }
.legal h1 { font-size: clamp(2rem, 5vw, 3rem); color: var(--petrol); margin-bottom: 16px; }
.legal h2 { font-size: 1.6rem; margin: 48px 0 12px; color: var(--petrol); scroll-margin-top: 90px; }
.legal p, .legal ul { margin-bottom: 12px; }
.legal ul { list-style: disc; padding-left: 20px; }
.legal mark { background: #EFE7D2; color: var(--night); padding: 0 4px; border-radius: 2px; }
.legal-note { background: var(--sage-tint); padding: 14px 16px; border-radius: 4px; font-size: .95rem; }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid, .split { grid-template-columns: 1fr; }
  .stairs { max-width: 560px; height: 320px; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .area { grid-template-columns: 1fr; gap: 14px; }
}

@media (max-width: 780px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; background: var(--ivory); border-bottom: 1px solid var(--line); padding: 8px 20px 20px; }
  .nav.is-open { display: flex; }
  .nav a:not(.btn) { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav .btn { margin-top: 14px; }
  .header-row { position: relative; min-height: 64px; }
  .site-header .wrap { position: static; }
  .course-row { grid-template-columns: 1fr; gap: 8px; justify-items: start; }
  .course-row .link { justify-self: start; }
  .check-list, .areas-grid { grid-template-columns: 1fr; }
  .climb { grid-template-columns: 1fr; gap: 32px; }
  .climb-2, .climb-3 { padding-bottom: 0; }
  .climb-1 { order: 1; } .climb-2 { order: 2; } .climb-3 { order: 3; }
}

@media (max-width: 520px) {
  .stairs { height: 300px; }
  .logo-img { height: 46px; }
  .hero-actions .btn { width: 100%; }
  .facts { grid-template-columns: 1fr; gap: 14px; }
  .compare { grid-template-columns: 1fr; }
  .compare-col, .compare-no { padding: 20px 0 0; border-left: 0; }
  .footer-nav { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}