:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --paper: #f4f4f0;
  --yellow: #ffd400;
  --blue: #2f6bff;
  --red: #e8402b;
  --grey: #6b6b6b;
  --border: 3px solid var(--black);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "JetBrains Mono", "Courier New", Courier, monospace;
  background: var(--paper);
  color: var(--black);
  line-height: 1.5;
}

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

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

/* NAV */
nav.topbar {
  background: var(--black);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 3px solid var(--yellow);
}
nav.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
nav.topbar .brand {
  font-weight: 800;
  letter-spacing: 1px;
  font-size: 15px;
  text-transform: uppercase;
}
nav.topbar .brand span { color: var(--yellow); }
nav.topbar .links { display: flex; gap: 28px; }
nav.topbar .links a {
  color: var(--white);
  text-decoration: none;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
}
nav.topbar .links a:hover { border-bottom-color: var(--yellow); }
nav.topbar .cta {
  background: var(--yellow);
  color: var(--black);
  padding: 8px 18px;
  font-weight: 800;
  text-decoration: none;
  font-size: 13px;
  text-transform: uppercase;
  border: 2px solid var(--black);
}

/* HERO */
header.hero {
  background: var(--black);
  color: var(--white);
  padding: 90px 0 110px;
  border-bottom: 6px solid var(--yellow);
  position: relative;
  overflow: hidden;
}
header.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}
header.hero .tag {
  display: inline-block;
  background: var(--yellow);
  color: var(--black);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 6px 12px;
  margin-bottom: 24px;
}
header.hero h1 {
  font-size: 46px;
  line-height: 1.08;
  margin: 0 0 22px;
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: -0.5px;
}
header.hero h1 em {
  font-style: normal;
  color: var(--yellow);
}
header.hero p.lead {
  font-size: 17px;
  color: #d8d8d8;
  max-width: 480px;
  margin: 0 0 34px;
}
.btn-row { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 14px 26px;
  font-weight: 800;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.5px;
  text-decoration: none;
  border: 3px solid var(--black);
}
.btn-primary { background: var(--yellow); color: var(--black); box-shadow: 6px 6px 0 var(--blue); }
.btn-primary:hover { box-shadow: 3px 3px 0 var(--blue); transform: translate(3px, 3px); }
.btn-outline { background: transparent; color: var(--white); border-color: var(--white); }
.btn-outline:hover { background: var(--white); color: var(--black); }

header.hero .shot {
  border: 3px solid var(--white);
  box-shadow: 10px 10px 0 var(--blue);
}
header.hero .shot img { width: 100%; }

/* SECTIONS */
section { padding: 90px 0; }
section.alt { background: var(--white); border-top: 3px solid var(--black); border-bottom: 3px solid var(--black); }

.eyebrow {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 10px;
}
h2.section-title {
  font-size: 32px;
  text-transform: uppercase;
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -0.5px;
}
p.section-lead {
  max-width: 640px;
  color: var(--grey);
  font-size: 16px;
  margin: 0 0 50px;
}

/* PROBLEM / SOLUTION */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.card {
  border: var(--border);
  background: var(--white);
  padding: 32px;
}
.card.dark { background: var(--black); color: var(--white); }
.card h3 {
  text-transform: uppercase;
  font-size: 18px;
  margin: 0 0 16px;
  font-weight: 800;
}
.card ul { margin: 0; padding-left: 20px; }
.card li { margin-bottom: 10px; color: inherit; }
.card.dark li { color: #d8d8d8; }
.card .icon { font-size: 22px; margin-bottom: 14px; display: block; }

/* FEATURES */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 60px 0;
  border-bottom: 2px solid #dcdcd4;
}
.feature:last-child { border-bottom: none; }
.feature:nth-child(even) .feature-copy { order: 2; }
.feature-copy .num {
  font-size: 13px;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: 1px;
  margin-bottom: 10px;
}
.feature-copy h3 {
  font-size: 26px;
  text-transform: uppercase;
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -0.3px;
}
.feature-copy p { color: #333; font-size: 15.5px; margin: 0 0 18px; }
.feature-copy .badge {
  display: inline-block;
  background: var(--paper);
  border: 2px solid var(--black);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  padding: 5px 10px;
  margin-right: 8px;
  margin-bottom: 8px;
}
.feature-shot {
  border: 3px solid var(--black);
  box-shadow: 8px 8px 0 var(--yellow);
}
.feature:nth-child(even) .feature-shot { box-shadow: -8px 8px 0 var(--yellow); }

/* ADVANTAGES */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.adv-card {
  border: var(--border);
  background: var(--white);
  padding: 28px;
}
.adv-card .n {
  font-size: 30px;
  font-weight: 800;
  color: var(--yellow);
  -webkit-text-stroke: 2px var(--black);
  margin-bottom: 12px;
}
.adv-card h4 {
  text-transform: uppercase;
  font-size: 15px;
  font-weight: 800;
  margin: 0 0 10px;
}
.adv-card p { color: var(--grey); font-size: 14px; margin: 0; }

/* CURRICULUM STRIP */
.strip {
  background: var(--blue);
  color: var(--white);
  padding: 46px 0;
  border-top: 3px solid var(--black);
  border-bottom: 3px solid var(--black);
}
.strip .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}
.strip .chips { display: flex; flex-wrap: wrap; gap: 10px; }
.strip .chip {
  border: 2px solid var(--white);
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}
.strip .label { font-weight: 800; text-transform: uppercase; font-size: 14px; }

/* FAQ */
.faq-list { max-width: 760px; }
.faq-item {
  border: var(--border);
  background: var(--white);
  margin-bottom: 16px;
  padding: 22px 26px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 800;
  font-size: 15.5px;
  text-transform: uppercase;
  letter-spacing: 0.2px;
  list-style: none;
  position: relative;
  padding-right: 30px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 20px;
  color: var(--blue);
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p {
  color: var(--grey);
  font-size: 15px;
  margin: 14px 0 0;
}

/* CTA */
section.cta-final {
  background: var(--black);
  color: var(--white);
  text-align: center;
  padding: 100px 0;
}
section.cta-final h2 {
  font-size: 36px;
  text-transform: uppercase;
  font-weight: 800;
  margin: 0 0 18px;
}
section.cta-final p {
  color: #ccc;
  max-width: 520px;
  margin: 0 auto 36px;
  font-size: 16px;
}
section.cta-final .btn-row { justify-content: center; }

/* FOOTER */
footer {
  background: var(--paper);
  padding: 34px 0;
  border-top: 3px solid var(--black);
  font-size: 13px;
  color: var(--grey);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 860px) {
  header.hero .wrap,
  .problem-grid,
  .feature,
  .adv-grid {
    grid-template-columns: 1fr;
  }
  .feature:nth-child(even) .feature-copy { order: 0; }
  header.hero h1 { font-size: 32px; }
  nav.topbar .links { display: none; }
}

@media (prefers-color-scheme: dark) {
  body { background: #16161a; color: #eee; }
  section.alt { background: #1c1c20; border-color: #333; }
  .card { background: #1c1c20; border-color: #444; color: #eee; }
  .card ul li { color: #ccc; }
  p.section-lead, .feature-copy p, .adv-card p { color: #aaa; }
  .feature { border-color: #333; }
  .feature-copy .badge { background: #23232a; border-color: #555; color: #eee; }
  .adv-card { background: #1c1c20; border-color: #444; }
  .faq-item { background: #1c1c20; border-color: #444; }
  .faq-item p { color: #aaa; }
  footer { background: #1c1c20; border-color: #333; color: #999; }
}