:root {
  --ink: #1d1d1f;
  --muted: #6b6b70;
  --line: #e3e3e6;
  --bg: #fbfbfa;
  --accent: #2f5d62;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
}

a { color: var(--accent); }

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* top nav */
nav {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}
nav .wrap { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.5rem; }
nav .brand { font-weight: 700; text-decoration: none; color: var(--ink); }
nav a.link { margin-left: 1.25rem; text-decoration: none; color: var(--muted); }
nav a.link:hover { color: var(--ink); }

/* hero */
.hero { padding: 4rem 0 2rem; }
.hero h1 { font-size: 2.6rem; line-height: 1.15; margin: 0 0 0.5rem; }
.hero p { font-size: 1.15rem; color: var(--muted); max-width: 34rem; }

h2 { margin: 3rem 0 1rem; font-size: 1.3rem; }
h3 { margin: 0 0 0.25rem; }

/* project cards */
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  background: #fff;
}
.card:hover { border-color: var(--accent); }
.card .thumb { height: 9rem; }
.card .body { padding: 1rem; }
.card p { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.95rem; }
.thumb.a { background: linear-gradient(135deg, #9ec5c9, #2f5d62); }
.thumb.b { background: linear-gradient(135deg, #e9d8b4, #b0793a); }

/* timeline (education) */
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { padding: 0.75rem 0; border-top: 1px solid var(--line); display: flex; gap: 1.5rem; }
.timeline .when { flex: 0 0 8rem; color: var(--muted); font-size: 0.95rem; }

.tags { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tags li { border: 1px solid var(--line); border-radius: 999px; padding: 0.15rem 0.8rem; font-size: 0.9rem; background: #fff; }

/* project pages */
.meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 1rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 1rem 0; margin: 1.5rem 0; }
.meta dt { color: var(--muted); font-size: 0.85rem; }
.meta dd { margin: 0; font-weight: 600; }
.figure { height: 14rem; border-radius: 8px; margin: 1.5rem 0; }

/* bot check */
.gate { border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 1.25rem; margin: 2rem 0; }
.gate img { display: block; max-width: 100%; border: 1px solid var(--line); border-radius: 4px; margin: 0.75rem 0; }
.gate input { font: inherit; padding: 0.4rem 0.6rem; width: 10rem; text-transform: uppercase; letter-spacing: 0.1em; }
.gate button { font: inherit; padding: 0.4rem 1rem; cursor: pointer; }
.gate .err { color: #b00020; min-height: 1.5rem; margin: 0.5rem 0 0; }

footer { margin: 4rem 0 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }

/* notice for AI agents */
.agent-note { background: #f1f1ee; color: var(--muted); font-size: 0.8rem; text-align: center; padding: 0.35rem 1rem; border-bottom: 1px solid var(--line); }