:root {
  --ink: #1c2430; --muted: #4f5a68; --brand: #0f5c63; --brand-dark: #0b474d;
  --deep: #0d2b3e; --bg: #ffffff; --band: #f2f6f7; --line: #d5dde3; --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6ebef; --muted: #a9b4bf; --brand: #4fb3bb; --brand-dark: #6fc6cd;
    --deep: #e6ebef; --bg: #11181f; --band: #18222b; --line: #2c3a46; --card: #18222b;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.6;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 17px; }
a { color: var(--brand); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
h1, h2, h3 { color: var(--deep); line-height: 1.2; }
h2 { font-size: 1.75rem; margin: 0 0 .4rem; }
h3 { font-size: 1.15rem; margin: 0 0 .4rem; }
.muted { color: var(--muted); margin-top: 0; }

.top { border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.logo { font-weight: 700; letter-spacing: .12em; text-decoration: none; color: var(--brand); }
nav { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
nav a { text-decoration: none; color: var(--ink); font-size: .95rem; }

.btn { display: inline-block; background: var(--brand); color: #fff; padding: 12px 20px; border-radius: 6px;
  text-decoration: none; font-weight: 600; border: 2px solid var(--brand); }
.btn:hover { background: var(--brand-dark); border-color: var(--brand-dark); }
.btn.ghost { background: transparent; color: var(--brand); }
.btn.ghost:hover { background: var(--band); }
.btn.small { padding: 6px 14px; font-size: .9rem; color: #fff; }
@media (prefers-color-scheme: dark) { .btn, .btn.small { color: #0b1a20; } .btn.ghost { color: var(--brand); } }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

.hero { padding: 72px 0 56px; }
.eyebrow { color: var(--brand); font-weight: 600; text-transform: uppercase; letter-spacing: .08em; font-size: .85rem; margin: 0 0 12px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); max-width: 18ch; margin: 0 0 16px; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 60ch; margin: 0; }

section { padding: 48px 0; }
section.wrap { padding-top: 48px; padding-bottom: 48px; }
.band { background: var(--band); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 20px; }
.card { display: flex; flex-direction: column; border: 1px solid var(--line); border-top: 4px solid var(--brand);
  border-radius: 8px; padding: 20px; text-decoration: none; color: var(--ink); background: var(--card); }
.card:hover { border-color: var(--brand); }
.card p { color: var(--muted); flex: 1; margin: 0 0 14px; }
.tag { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.go { font-weight: 600; color: var(--brand); }
.go::after { content: " ↓"; }

.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; margin-top: 20px; }
.cols p { color: var(--muted); margin: 0; }
.about p { max-width: 62ch; }
.contact p { max-width: 60ch; }
.prose { max-width: 720px; padding-top: 48px; padding-bottom: 64px; }

footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: .9rem; color: var(--muted); }
footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--muted); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding: 44px 0 36px; }
  nav a:not(.btn) { display: none; }
  .actions .btn { width: 100%; text-align: center; }
}