:root {
  --bg: #ffffff;
  --bg-soft: #f4f6f8;
  --text: #16202a;
  --muted: #5b6875;
  --line: #e2e7ec;
  --accent: #0f6e8c;
  --accent-soft: #e3f1f5;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f151b;
    --bg-soft: #161e26;
    --text: #e6ebf0;
    --muted: #9aa7b3;
    --line: #26313b;
    --accent: #4fb3d1;
    --accent-soft: #15303a;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; letter-spacing: -0.02em; color: var(--text); }
.logo span { color: var(--accent); }
.logo:hover { text-decoration: none; }
nav a { color: var(--muted); margin-left: 28px; font-size: 15px; }
nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { padding: 112px 0 96px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(36px, 5.5vw, 60px); line-height: 1.1; letter-spacing: -0.03em;
  margin: 0 0 24px; max-width: 16ch;
}
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 60ch; margin: 0 0 36px; }
.btn {
  display: inline-block; background: var(--accent); color: #fff; font-weight: 600;
  padding: 13px 26px; border-radius: 8px; font-size: 16px;
}
@media (prefers-color-scheme: dark) { .btn { color: #0f151b; } }
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); margin-left: 12px; }

.facts { display: flex; flex-wrap: wrap; gap: 40px; margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--line); }
.facts div strong { display: block; font-size: 28px; letter-spacing: -0.02em; }
.facts div span { color: var(--muted); font-size: 14px; }

/* Sections */
section { padding: 88px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: clamp(28px, 3.5vw, 38px); letter-spacing: -0.02em; line-height: 1.2; margin: 0 0 16px; }
.section-intro { color: var(--muted); max-width: 62ch; margin: 0 0 48px; }

.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 28px;
}
.card h3 { margin: 0 0 10px; font-size: 19px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card .icon {
  width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 18px;
}
.card .icon svg { width: 22px; height: 22px; }

/* Tech tags */
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tags span {
  font-size: 14px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text);
}
.tag-group { margin-bottom: 28px; }
.tag-group h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 12px; }

/* Timeline */
.timeline { border-left: 2px solid var(--line); margin-left: 6px; }
.timeline .item { position: relative; padding: 0 0 36px 32px; }
.timeline .item::before {
  content: ""; position: absolute; left: -8px; top: 7px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--bg); border: 3px solid var(--accent);
}
.timeline .when { font-size: 14px; color: var(--muted); }
.timeline h3 { margin: 2px 0 6px; font-size: 19px; }
.timeline p { margin: 0; color: var(--muted); max-width: 70ch; }

/* About */
.about { display: grid; grid-template-columns: 280px 1fr; gap: 56px; align-items: start; }
.about img { width: 100%; border-radius: 12px; display: block; }
.about p { margin: 0 0 18px; }
.about ul { padding-left: 20px; margin: 0; color: var(--muted); }

/* Contact */
.contact { text-align: center; }
.contact .section-intro { margin-left: auto; margin-right: auto; }
.contact-lines { font-size: 20px; margin-bottom: 36px; }
.contact-lines a { color: var(--text); }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 32px 0; font-size: 14px; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer a { color: var(--muted); margin-left: 20px; }

/* Legal pages */
.legal { padding: 72px 0 96px; max-width: 760px; }
.legal h1 { font-size: 40px; letter-spacing: -0.02em; margin: 0 0 32px; }
.legal h2 { font-size: 22px; margin: 40px 0 10px; }
.legal p, .legal li { color: var(--muted); }
.todo { background: #fff4cc; color: #6b5300; padding: 0 4px; border-radius: 3px; }

@media (max-width: 760px) {
  nav { display: none; }
  .hero { padding: 72px 0 64px; }
  section { padding: 64px 0; }
  .about { grid-template-columns: 1fr; gap: 32px; }
  .about img { max-width: 220px; }
  .btn.ghost { margin: 12px 0 0; }
  .wrap { padding: 0 16px; }
}