:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #1a5fb4;
  --border: #d8dee4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --text: #e6e8ea;
    --muted: #9aa3ab;
    --accent: #6ea8fe;
    --border: #2c3238;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

.container { max-width: 760px; margin: 0 auto; padding: 0 1rem; }

/* Header / nav */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.site-header nav {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: .5rem 1.5rem;
  padding-top: .75rem; padding-bottom: .75rem;
}
.brand { font-weight: 700; color: var(--text); }
.site-header ul { display: flex; flex-wrap: wrap; gap: .25rem 1.25rem; list-style: none; margin: 0; padding: 0; }

/* Sections */
section { padding: 2.5rem 0 1rem; }
h1 { font-size: 2rem; margin: 0 0 .25rem; line-height: 1.2; }
h2 { font-size: 1.4rem; margin: 0 0 1rem; padding-bottom: .4rem; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 1.75rem 0 .5rem; }
h4 { font-size: 1rem; margin: 0; }
.zh { font-weight: 400; color: var(--muted); font-size: 1.3rem; margin-left: .25rem; }
.muted { color: var(--muted); margin: .15rem 0 0; }
.subtitle { margin: 0 0 1rem; font-size: 1.1rem; }
.item { margin: 0 0 1rem; }

/* Hero */
.hero { display: flex; gap: 1.75rem; align-items: flex-start; padding-top: 3rem; }
.photo {
  flex: 0 0 150px; height: 190px;
  display: flex; align-items: center; justify-content: center;
  border: 1px dashed var(--border); border-radius: 8px; color: var(--muted);
}

footer { padding: 2rem 1rem 3rem; margin-top: 2rem; border-top: 1px solid var(--border); }

@media (max-width: 600px) {
  .hero { flex-direction: column; }
  .photo { flex-basis: auto; width: 150px; }
}