:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #1a4d8c;
  --border: #e5e5e5;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.site-header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: 2.5rem;
}

.lang-nav {
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.lang-nav a {
  color: var(--muted);
  text-decoration: none;
  margin: 0 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.lang-nav a.active {
  color: var(--text);
  font-weight: 600;
}

.lang-nav a:hover {
  color: var(--accent);
}

.lang-nav span {
  color: var(--border);
}

h1 {
  font-size: 2.25rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.tagline {
  color: var(--muted);
  margin: 0 0 1.5rem;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 3rem 0 1.25rem;
  color: var(--text);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(26, 77, 140, 0.25);
  transition: border-color 0.15s, color 0.15s;
}

a:hover {
  border-bottom-color: var(--accent);
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

.intro p {
  font-size: 1.02rem;
}

.entries {
  list-style: none;
  padding: 0;
  margin: 0;
}

.entries li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
}

.entries li + li {
  border-top: 1px solid var(--border);
}

.entry-meta {
  font-size: 0.85rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding-top: 0.15rem;
}

.entry-body {
  font-size: 0.97rem;
  line-height: 1.6;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.8rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.97rem;
}

.contact-label {
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-top: 0.15rem;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

@media (max-width: 600px) {
  body { font-size: 16px; }

  .container { padding: 2rem 1.25rem 3rem; }

  h1 { font-size: 1.85rem; }

  .entries li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .entry-meta {
    font-size: 0.8rem;
  }

  .contact-list li {
    grid-template-columns: 4rem 1fr;
    gap: 0.75rem;
  }
}