:root {
  --bg: #030914;
  --panel: #08162a;
  --panel-2: #0b1c33;
  --line: rgba(137, 195, 228, 0.18);
  --text: #f4f8fc;
  --muted: #9bb0c7;
  --accent: #42cdf4;
  --accent-2: #69ddb4;
  --gold: #d7b66b;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 5%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 32rem),
    radial-gradient(circle at 8% 78%, color-mix(in srgb, var(--accent-2) 8%, transparent), transparent 34rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

button, a { font: inherit; }
a { color: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .75rem 1rem; background: white; color: #04101f; border-radius: .5rem; }
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: .9rem max(1.25rem, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(3, 9, 20, .84);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: .72rem; text-decoration: none; letter-spacing: .02em; }
.brand-mark {
  display: grid; place-items: center; width: 36px; height: 42px;
  color: #02101d; font-weight: 900; font-size: 1.35rem;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  clip-path: polygon(0 0, 100% 10%, 76% 100%, 0 82%);
}
.brand strong { display: block; font-size: 1rem; }
.brand small { display: block; color: var(--accent); font: 700 .62rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .2em; }
nav { display: flex; align-items: center; gap: 1.15rem; }
nav > a { text-decoration: none; color: var(--muted); font-size: .9rem; font-weight: 650; }
nav > a:hover, nav > a:focus-visible, nav > a[aria-current="page"] { color: var(--text); }
.language { display: flex; padding: 3px; border: 1px solid var(--line); border-radius: 999px; }
.language button { min-width: 34px; min-height: 28px; border: 0; border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font-size: .75rem; font-weight: 800; }
.language button[aria-pressed="true"] { color: #03111d; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.signin { padding: .55rem .9rem; border: 1px solid color-mix(in srgb, var(--gold) 62%, transparent); border-radius: .7rem; color: var(--gold); }

main { overflow: hidden; }
.hero, .section, .metrics, footer { width: min(1180px, calc(100% - 2.5rem)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: 1.5fr .82fr; gap: clamp(2rem, 6vw, 6rem); align-items: center; min-height: 610px; padding: 5rem 0 3.4rem; }
.eyebrow { margin: 0 0 1rem; color: var(--accent); font: 800 .74rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { max-width: 780px; margin: 0; font-size: clamp(2.7rem, 6.3vw, 5.7rem); line-height: .98; letter-spacing: -.055em; text-wrap: balance; }
.hero-summary { max-width: 710px; margin: 1.6rem 0 0; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.2rem); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.hero-actions a { display: inline-flex; align-items: center; min-height: 48px; padding: .7rem 1.1rem; border-radius: .75rem; text-decoration: none; font-size: .9rem; font-weight: 800; }
.primary-action { color: #02101d; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 14px 40px color-mix(in srgb, var(--accent) 18%, transparent); }
.secondary-action { border: 1px solid var(--line); background: rgba(8, 22, 42, .54); }
.trust-row { display: flex; flex-wrap: wrap; gap: .65rem 1.25rem; margin-top: 1.5rem; color: var(--muted); font-size: .79rem; }
.trust-row b { color: var(--accent-2); }

.preview-card { position: relative; padding: 1.45rem; border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent); border-radius: 1.4rem; background: linear-gradient(160deg, rgba(14, 38, 71, .94), rgba(5, 16, 32, .94)); box-shadow: var(--shadow); }
.preview-card::after { content: ""; position: absolute; inset: 14px -12px -14px 12px; z-index: -1; border: 1px solid color-mix(in srgb, var(--accent-2) 14%, transparent); border-radius: 1.4rem; }
.presenter { display: flex; align-items: center; gap: .8rem; padding-bottom: 1.15rem; margin-bottom: 1.2rem; border-bottom: 1px solid var(--line); }
.presenter-avatar { display: grid; place-items: center; width: 58px; height: 58px; border-radius: 50%; background: radial-gradient(circle at 35% 30%, var(--accent-2), color-mix(in srgb, var(--accent) 52%, #10223e)); box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 9%, transparent); }
.presenter-avatar span { color: #03101b; font-weight: 900; letter-spacing: -.03em; }
.presenter small, .presenter strong, .presenter span { display: block; }
.presenter small { color: var(--muted); font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; }
.presenter strong { font-size: 1rem; }
.presenter span { color: var(--accent-2); font-size: .76rem; }
.preview-pill, .boundary-badge { display: inline-flex; padding: .26rem .55rem; border: 1px solid color-mix(in srgb, var(--gold) 52%, transparent); border-radius: 999px; color: var(--gold); font: 800 .65rem/1.4 ui-monospace, monospace; letter-spacing: .12em; text-transform: uppercase; }
.lesson-id { margin: 1.25rem 0 .25rem; color: var(--accent); font: 800 .72rem ui-monospace, monospace; letter-spacing: .11em; }
.preview-card h2 { margin: 0 0 1.4rem; font-size: clamp(1.4rem, 2.5vw, 2rem); line-height: 1.15; letter-spacing: -.025em; }
.progress-label { display: flex; justify-content: space-between; color: var(--muted); font-size: .78rem; }
.progress-label strong { color: var(--text); }
.progress-track { height: 7px; margin: .45rem 0 1rem; overflow: hidden; border-radius: 999px; background: rgba(255,255,255,.07); }
.progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .25s ease; }
.preview-note { margin: 0; color: var(--muted); font-size: .75rem; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); margin-bottom: 6.5rem; overflow: hidden; border: 1px solid var(--line); border-radius: 1rem; background: rgba(7, 19, 37, .65); }
.metrics div { padding: 1.15rem 1.3rem; border-right: 1px solid var(--line); }
.metrics div:last-child { border-right: 0; }
.metrics small { display: block; color: var(--muted); font: 700 .64rem ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; }
.metrics strong { display: block; margin-top: .35rem; font-size: 1.2rem; }

.section { padding: 4.5rem 0; scroll-margin-top: 76px; }
.section-intro { display: grid; grid-template-columns: .62fr 1.25fr; gap: 1rem 4rem; align-items: start; margin-bottom: 2.5rem; }
.section-intro .eyebrow { grid-column: 1 / -1; margin-bottom: 0; }
.section-intro h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.05; letter-spacing: -.045em; text-wrap: balance; }
.section-intro > p:last-child { margin: 0; color: var(--muted); font-size: 1rem; }
.course-list { display: grid; gap: .75rem; }
.course { border: 1px solid var(--line); border-radius: 1rem; background: rgba(7, 19, 37, .62); transition: border-color .2s ease, background .2s ease; }
.course[open] { border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: rgba(9, 26, 49, .84); }
.course summary { display: grid; grid-template-columns: 56px 1fr auto 28px; gap: 1rem; align-items: center; min-height: 82px; padding: .8rem 1rem; cursor: pointer; list-style: none; }
.course summary::-webkit-details-marker { display: none; }
.course-number { color: var(--accent); font: 800 .78rem ui-monospace, monospace; letter-spacing: .1em; }
.course-title { font-size: 1rem; font-weight: 760; line-height: 1.35; }
.course-count { color: var(--muted); font-size: .76rem; white-space: nowrap; }
.course-toggle { display: grid; place-items: center; width: 26px; height: 26px; border: 1px solid var(--line); border-radius: 50%; color: var(--accent); transition: transform .2s ease; }
.course[open] .course-toggle { transform: rotate(45deg); }
.lesson-list { display: grid; grid-template-columns: 1fr 1fr; gap: .65rem; padding: 0 1rem 1rem 5.5rem; }
.lesson-row { padding: .9rem; border: 1px solid rgba(137,195,228,.11); border-radius: .75rem; background: rgba(2, 9, 19, .52); }
.lesson-row small { color: var(--gold); font: 800 .67rem ui-monospace, monospace; }
.lesson-row strong { display: block; margin: .18rem 0 .3rem; font-size: .88rem; line-height: 1.35; }
.lesson-row p { margin: 0; color: var(--muted); font-size: .77rem; line-height: 1.5; }

.paths { border-top: 1px solid var(--line); }
.section-intro.compact { grid-template-columns: .8fr 1.2fr; }
.path-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.path-card { padding: 1.15rem; border: 1px solid var(--line); border-radius: .9rem; background: linear-gradient(145deg, rgba(11, 28, 51, .72), rgba(5, 15, 29, .72)); }
.path-card small { color: var(--accent); font: 800 .67rem ui-monospace, monospace; letter-spacing: .1em; text-transform: uppercase; }
.path-card h3 { margin: .35rem 0 .45rem; font-size: 1rem; }
.path-card p { margin: 0; color: var(--muted); font-size: .82rem; }

.sample-shell { padding: clamp(1.25rem, 4vw, 2.5rem); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); border-radius: 1.5rem; background: linear-gradient(150deg, rgba(12, 35, 65, .95), rgba(4, 14, 28, .96)); box-shadow: var(--shadow); }
.sample-heading { display: flex; justify-content: space-between; gap: 2rem; align-items: flex-start; }
.sample-heading h2 { margin: 0; font-size: clamp(1.8rem, 3.3vw, 2.8rem); letter-spacing: -.035em; }
.sample-heading p:not(.eyebrow) { max-width: 720px; color: var(--muted); }
.checkpoint-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; margin-top: 1.5rem; }
.checkpoint { min-height: 150px; padding: 1rem; text-align: left; color: var(--text); border: 1px solid var(--line); border-radius: .9rem; background: rgba(3, 11, 23, .66); cursor: pointer; transition: transform .18s ease, border-color .18s ease; }
.checkpoint:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.checkpoint[aria-pressed="true"] { border-color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 8%, rgba(3, 11, 23, .85)); }
.checkpoint-number { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 50%; color: var(--accent); font: 800 .7rem ui-monospace, monospace; }
.checkpoint[aria-pressed="true"] .checkpoint-number { color: #03111d; background: var(--accent-2); border-color: var(--accent-2); }
.checkpoint strong { display: block; margin-top: .8rem; font-size: .9rem; line-height: 1.35; }
.sample-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-top: 1rem; margin-top: 1rem; border-top: 1px solid var(--line); }
.sample-footer p { margin: 0; color: var(--muted); font-size: .8rem; }
.reset-button { padding: .55rem .8rem; color: var(--muted); border: 1px solid var(--line); border-radius: .65rem; background: transparent; cursor: pointer; }
.reset-button:hover, .reset-button:focus-visible { color: var(--text); border-color: var(--accent); }

.governance { display: grid; grid-template-columns: 110px 1fr; gap: 2rem; align-items: center; margin-bottom: 5rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.governance-mark { display: grid; place-items: center; width: 92px; height: 92px; border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); border-radius: 1.2rem; color: var(--accent); font-weight: 900; font-size: 1.5rem; box-shadow: inset 0 0 30px color-mix(in srgb, var(--accent) 8%, transparent); }
.governance h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.6rem); letter-spacing: -.03em; }
.governance p:last-child { margin: .7rem 0 0; color: var(--muted); }

footer { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 2rem 0 3rem; color: var(--muted); font-size: .78rem; border-top: 1px solid var(--line); }
footer strong, footer span { display: block; }
footer strong { color: var(--text); }

:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 72%, white); outline-offset: 3px; }

@media (max-width: 880px) {
  .site-header { align-items: flex-start; }
  nav { gap: .65rem; }
  nav > a:not(.signin) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 3.7rem; }
  .preview-card { max-width: 560px; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metrics div:nth-child(2) { border-right: 0; }
  .metrics div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-intro, .section-intro.compact { grid-template-columns: 1fr; gap: 1rem; }
  .lesson-list { grid-template-columns: 1fr; padding-left: 1rem; }
  .checkpoint-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .site-header { min-height: 66px; padding-inline: .8rem; }
  .brand strong { font-size: .86rem; }
  .brand-mark { width: 30px; height: 35px; }
  .signin { padding: .45rem .6rem; }
  .hero, .section, .metrics, footer { width: min(100% - 1.5rem, 1180px); }
  .hero { min-height: 0; padding-top: 2.8rem; }
  .metrics { margin-bottom: 3rem; }
  .course summary { grid-template-columns: 40px 1fr 24px; gap: .5rem; }
  .course-count { display: none; }
  .path-grid, .checkpoint-grid { grid-template-columns: 1fr; }
  .sample-heading { display: block; }
  .boundary-badge { margin-top: .5rem; }
  .governance { grid-template-columns: 1fr; }
  footer { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* Approved educational presenter; retain the existing Academy shell and curriculum. */
.presenter{display:grid;grid-template-columns:minmax(0,1fr);gap:17px;margin-bottom:26px}
.presenter-portrait{height:290px;border:1px solid rgba(201,169,110,.26);border-radius:18px;overflow:hidden;background:linear-gradient(145deg,#10223b,#020a14);display:grid;place-items:center}
.presenter-portrait img{display:block;width:100%;height:290px;object-fit:contain;object-position:center}
.presenter-portrait img[hidden]{display:none}
.presenter-portrait>p{font-size:14px;line-height:1.7;color:#e8eaf0;padding:24px;text-align:center}
.presenter>div>strong{font-size:28px;line-height:1.15}
.presenter>div>span{color:#d3bb93;font-size:13px;line-height:1.6}
.presenter-note{font-size:12px;line-height:1.65;color:#adbad0;margin:7px 0 0}
.preview-note{color:#adbad0;line-height:1.65}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #00d4ff;outline-offset:4px}
@media(max-width:640px){.presenter-portrait,.presenter-portrait img{height:250px}.preview-card{padding:22px}}
@media(prefers-reduced-motion:reduce){.presenter *{transition:none!important;animation:none!important}}

.presenter-portrait{height:auto;aspect-ratio:1679/937}
.presenter-portrait img{height:auto;aspect-ratio:1679/937;object-fit:contain}

/* Keep existing Academy navigation and lesson controls within narrow viewports. */
@media(max-width:560px){
  .site-header{flex-wrap:wrap;gap:12px;align-items:center}
  .site-header nav{flex-wrap:wrap;min-width:0;max-width:100%}
  .hero-copy,.preview-card,.course-title,.metrics>div,.path-card{min-width:0;overflow-wrap:anywhere}
  .sample-footer{flex-wrap:wrap;gap:1rem}
  .sample-footer button{white-space:normal}
}