:root {
  --ink: #17212b;
  --muted: #65727d;
  --paper: #f4f0e8;
  --surface: #fffdf8;
  --line: #d8d2c8;
  --accent: #e85d3f;
  --accent-dark: #b83f29;
  --mint: #b9d9cc;
  --shadow: 0 18px 45px rgba(23, 33, 43, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: 'Trebuchet MS', sans-serif;
  line-height: 1.6;
}
a { color: inherit; }
.site-header { padding: 24px 6vw; border-bottom: 1px solid var(--line); }
.navigation { max-width: 1120px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-size: 1.1rem; font-weight: 700; text-decoration: none; letter-spacing: 0.04em; }
.nav-links { display: flex; gap: 24px; color: var(--muted); font-size: 0.9rem; }
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--accent-dark); }
main { max-width: 1120px; margin: 0 auto; padding: 0 6vw; }
.hero { min-height: 620px; display: grid; grid-template-columns: minmax(0, 1fr) 260px; align-items: center; gap: 64px; padding: 90px 0; }
.eyebrow { margin: 0 0 18px; color: var(--accent-dark); font-family: Consolas, monospace; font-size: 0.75rem; letter-spacing: 0.1em; }
h1, h2 { margin: 0; line-height: 1.05; letter-spacing: -0.03em; }
h1 { max-width: 720px; font-size: clamp(3.5rem, 8vw, 7.3rem); }
h2 { font-size: clamp(2rem, 4vw, 3.8rem); }
.hero-copy { max-width: 580px; margin: 28px 0 34px; color: var(--muted); font-size: 1.1rem; }
.button-link, button { display: inline-block; padding: 13px 19px; border: 2px solid var(--ink); background: var(--ink); color: var(--surface); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.button-link:hover, button:hover { background: var(--accent); border-color: var(--accent); }
.hero-mark { display: grid; aspect-ratio: 1; place-items: center; border: 1px solid var(--ink); background: var(--mint); box-shadow: 18px 18px 0 var(--accent); font-family: Consolas, monospace; font-size: 3rem; transform: rotate(4deg); }
.content-section { padding: 110px 0; border-top: 1px solid var(--line); }
.section-heading { max-width: 760px; margin-bottom: 50px; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.two-column > p { max-width: 450px; margin: 0; color: var(--muted); font-size: 1.25rem; }
.placeholder-figure { margin: 0; }
.image-placeholder { display: grid; min-height: 230px; place-items: center; background: var(--ink); color: var(--mint); font-family: Consolas, monospace; font-size: 0.8rem; letter-spacing: 0.08em; }
figcaption { margin-top: 12px; color: var(--muted); font-size: 0.85rem; }
.topic-list { padding: 0; margin: 0; list-style: none; border-top: 1px solid var(--ink); }
.topic-list li { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.topic-list span { color: var(--muted); }
.contact-section { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.learning-form { display: grid; gap: 12px; align-content: start; }
.learning-form label { font-weight: 600; }
textarea { width: 100%; resize: vertical; padding: 15px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: inherit; }
textarea:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.form-message { min-height: 28px; margin: 4px 0 0; color: var(--accent-dark); }
.site-footer { padding: 40px 6vw; background: var(--ink); color: var(--mint); text-align: center; font-family: Consolas, monospace; font-size: 0.8rem; }
@media (max-width: 700px) {
  .site-header { padding: 20px 6vw; }
  .navigation, .nav-links { align-items: flex-start; }
  .navigation { flex-direction: column; }
  .nav-links { gap: 14px; flex-wrap: wrap; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 48px; padding: 76px 0 96px; }
  .hero-mark { width: 150px; }
  .content-section, .contact-section { display: block; padding: 80px 0; }
  .two-column { display: block; }
  .two-column > p { margin-bottom: 40px; }
  .topic-list li { grid-template-columns: 1fr; gap: 4px; }
}