:root {
  --ink: #102a43;
  --ink-soft: #486581;
  --paper: #f7f4ed;
  --white: #ffffff;
  --signal: #f6c344;
  --signal-dark: #d29b12;
  --line: #d9e2ec;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(16, 42, 67, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
a { color: inherit; }
.skip-link { position: absolute; left: -999px; top: 0; z-index: 20; background: var(--ink); color: white; padding: .75rem 1rem; }
.skip-link:focus { left: 1rem; top: 1rem; }

.site-header { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 1rem clamp(1.25rem, 5vw, 5rem); background: rgba(247, 244, 237, .92); border-bottom: 1px solid rgba(16, 42, 67, .1); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(14px); }
.brand { display: inline-flex; align-items: center; gap: .7rem; font-weight: 800; text-decoration: none; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; background: var(--signal); border: 2px solid var(--ink); border-radius: 8px; font-size: .8rem; transform: rotate(-2deg); }
.site-nav { display: flex; gap: 1.5rem; align-items: center; }
.site-nav a { text-decoration: none; font-size: .95rem; font-weight: 650; }
.site-nav a:hover { text-decoration: underline; text-underline-offset: 5px; }
.menu-button { display: none; font: inherit; font-weight: 700; color: var(--ink); background: transparent; border: 1px solid var(--ink); border-radius: 8px; padding: .45rem .7rem; }

.hero { min-height: 76vh; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, .65fr); gap: clamp(2rem, 7vw, 7rem); align-items: center; padding: clamp(4rem, 9vw, 8rem) clamp(1.25rem, 7vw, 7rem); background: radial-gradient(circle at 82% 20%, rgba(246, 195, 68, .38), transparent 25%), linear-gradient(145deg, #edf5f4 0%, var(--paper) 60%); }
.hero-copy { max-width: 820px; }
.eyebrow { margin: 0 0 1rem; color: #80600e; font-size: .78rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 1.5rem; max-width: 850px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.2rem, 8vw, 7rem); font-weight: 500; line-height: .94; letter-spacing: -.055em; }
h2 { margin-bottom: 1rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.1rem, 4vw, 4rem); font-weight: 500; line-height: 1.04; letter-spacing: -.04em; }
h3 { margin-bottom: .65rem; font-size: 1.18rem; line-height: 1.25; }
.hero-lede { max-width: 690px; color: var(--ink-soft); font-size: clamp(1.1rem, 2vw, 1.35rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2rem; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: .7rem 1.15rem; border: 2px solid var(--ink); border-radius: 9px; font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 7px 0 rgba(16, 42, 67, .18); }
.button-primary { color: var(--ink); background: var(--signal); }
.button-secondary { background: transparent; }
.hero-card { padding: 2rem; background: var(--ink); color: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); transform: rotate(1.5deg); }
.card-label { color: #bcccdc; font-size: .8rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.hero-card ul { list-style: none; margin: 0; padding: 0; }
.hero-card li { padding: .75rem 0; border-bottom: 1px solid rgba(255,255,255,.16); font-family: Georgia, serif; font-size: 1.35rem; }
.hero-card li:last-child { border-bottom: 0; }

.section { padding: clamp(4rem, 8vw, 7rem) clamp(1.25rem, 7vw, 7rem); }
.section-heading { max-width: 760px; margin-bottom: 3rem; }
.section-heading > p:last-child, .signup > div > p:last-child { color: var(--ink-soft); font-size: 1.1rem; }
.topic-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
.topic-card { min-height: 255px; padding: 1.5rem; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 24px rgba(16, 42, 67, .06); }
.topic-number { display: block; margin-bottom: 3rem; color: #9b7413; font-family: ui-monospace, monospace; font-weight: 800; }
.topic-card p { color: var(--ink-soft); }
.approach { display: grid; grid-template-columns: minmax(0, .9fr) minmax(300px, 1.1fr); gap: clamp(2rem, 8vw, 8rem); background: var(--ink); color: white; }
.approach .eyebrow { color: var(--signal); }
.principles { display: grid; align-content: center; }
.principles div { display: grid; grid-template-columns: 160px 1fr; gap: 1rem; padding: 1.35rem 0; border-top: 1px solid rgba(255,255,255,.18); }
.principles span { color: #bcccdc; }
.signup { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .75fr); gap: clamp(2rem, 8vw, 8rem); align-items: center; background: var(--signal); }
.signup .eyebrow { color: var(--ink); }
.signup-form { padding: 1.5rem; background: rgba(255,255,255,.72); border: 2px solid var(--ink); border-radius: var(--radius); }
.signup-form label { display: block; margin-bottom: .45rem; font-weight: 800; }
.form-row { display: flex; gap: .55rem; }
.form-row input { min-width: 0; flex: 1; padding: .8rem .9rem; border: 2px solid var(--ink); border-radius: 9px; background: white; font: inherit; }
.form-note { margin: .7rem 0 0; font-size: .84rem; }
.site-footer { display: grid; grid-template-columns: 1fr 2fr auto; align-items: center; gap: 2rem; padding: 2.5rem clamp(1.25rem, 5vw, 5rem); background: #0b1f31; color: #d9e2ec; font-size: .85rem; }
.site-footer p { margin: 0; }

@media (max-width: 900px) {
  .hero, .approach, .signup { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .hero-card { max-width: 520px; transform: none; }
  .topic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .menu-button { display: block; }
  .site-nav { display: none; position: absolute; left: 1rem; right: 1rem; top: 68px; padding: 1rem; flex-direction: column; align-items: stretch; background: var(--white); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  h1 { font-size: clamp(3rem, 16vw, 4.7rem); }
  .topic-grid { grid-template-columns: 1fr; }
  .principles div { grid-template-columns: 1fr; gap: .25rem; }
  .form-row { flex-direction: column; }
}

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