:root {
  --nus-blue: #003d7c;
  --nus-blue-dark: #002b5c;
  --nus-orange: #ef7c00;
  --ink: #203040;
  --muted: #64788c;
  --line: #d5dde5;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: #eef3f7;
}

.guide-shell {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 72px;
}

.guide-header {
  padding: 34px;
  border-top: 6px solid var(--nus-orange);
  background: #fff;
}

.guide-header img {
  display: block;
  width: min(440px, 100%);
  margin-bottom: 36px;
}

.guide-header > p:first-of-type {
  margin: 0 0 8px;
  color: var(--nus-orange);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--nus-blue);
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.05;
}

.intro {
  max-width: 620px;
  margin: 18px 0 24px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.guide-header a {
  display: inline-flex;
  padding: 10px 16px;
  color: #fff;
  background: var(--nus-blue);
  font-weight: 750;
  text-decoration: none;
}

.guide-header a:hover { background: var(--nus-blue-dark); }

.guide-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

.guide-nav a {
  padding: 8px 11px;
  border: 1px solid var(--line);
  color: var(--nus-blue);
  background: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.guide-shell > section {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  padding: 26px 28px;
  border-top: 1px solid var(--line);
  background: #fff;
}

.guide-shell > section > span {
  color: var(--nus-orange);
  font-size: 14px;
  font-weight: 800;
}

h2 {
  margin: 0 0 7px;
  color: var(--nus-blue);
  font-size: 22px;
}

section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

@media (max-width: 560px) {
  .guide-shell { width: min(100% - 24px, 920px); padding-top: 12px; }
  .guide-header { padding: 24px; }
  .guide-shell > section { grid-template-columns: 1fr; gap: 6px; padding: 22px; }
}