:root {
  --paper: #f4f6f5;
  --surface: #ffffff;
  --ink: #18242f;
  --muted: #5d6b73;
  --line: #d9dfdc;
  --accent: #1f6a5a;
  --audit: #1f6a5a;
  --sport: #0f7a4a;
  --font-display: "IBM Plex Serif", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1619; --surface: #162026; --ink: #e4ebe8; --muted: #93a3a0; --line: #2a3840;
    --accent: #5fbfa6; --audit: #5fbfa6; --sport: #6fd39a;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
html, body { margin: 0; }
body { background: var(--paper); color: var(--ink); font-family: var(--font-body); line-height: 1.55; }
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

nav { position: sticky; top: 0; z-index: 1; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 12px max(20px, calc((100% - 1000px) / 2)); background: color-mix(in srgb, var(--paper) 90%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav a:hover { color: var(--ink); }
nav div { display: flex; gap: 18px; flex-wrap: wrap; }
nav .brand { font-family: var(--font-display); font-weight: 600; font-size: 17px; color: var(--ink); }

main { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
section { padding: 32px 0; }

.hero { padding: 64px 0 36px; border-bottom: 2px solid var(--ink); }
.eyebrow, .tag, .stack { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; margin: 0; }
.eyebrow { color: var(--accent); }
h1 { font-family: var(--font-display); font-weight: 600; font-size: clamp(40px, 7vw, 56px); line-height: 1.1; margin: 8px 0 14px; }
.lead { font-size: 19px; color: var(--muted); max-width: 64ch; margin: 0; }
.lead b { color: var(--ink); font-weight: 600; }

h2.section { font-family: var(--font-display); font-weight: 600; font-size: 28px; margin: 0 0 18px; }
h3 { font-family: var(--font-display); font-weight: 600; font-size: 20px; margin: 0; }

.projects { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.card { --c: var(--audit); background: var(--surface); border: 1px solid var(--line); border-top: 4px solid var(--c); border-radius: 10px; padding: 22px 24px; display: flex; flex-direction: column; }
.card.sport { --c: var(--sport); }
.card h3 { font-size: 22px; margin: 6px 0 10px; }
.card p { margin: 0 0 12px; }
.tag { align-self: flex-start; color: var(--c); font-weight: 600; padding: 4px 10px; border-radius: 999px; background: color-mix(in srgb, var(--c) 12%, transparent); border: 1px solid color-mix(in srgb, var(--c) 35%, transparent); box-shadow: 0 0 12px color-mix(in srgb, var(--c) 35%, transparent); }
.points { margin: 0 0 16px; padding-left: 1.1rem; color: var(--muted); font-size: 15px; }
.points li + li { margin-top: 4px; }
.card .stack { color: var(--muted); margin: auto 0 0; padding-top: 4px; }
.open { align-self: flex-start; margin-top: 16px; font-weight: 600; color: var(--surface); background: var(--c); text-decoration: none; padding: 9px 16px; border-radius: 6px; }
.open:hover { filter: brightness(1.1); }

footer { text-align: center; color: var(--muted); font-size: 14px; padding: 24px 20px 48px; }

@media (max-width: 640px) {
  nav div { gap: 12px; }
}