:root {
  --ink: #1a1a1a;
  --ink-soft: #5c5c5c;
  --paper: #f7f4ef;
  --surface: #ffffff;
  --accent: #c23b22;
  --border: #e6e0d6;
  --max: 720px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 16px;
}

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

header.site-header .wrap {
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.brand:hover { text-decoration: none; color: var(--accent); }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-size: 0.92rem;
}

nav a { color: var(--ink-soft); }
nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

.lang-switch {
  display: flex;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.lang-switch button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  cursor: pointer;
  color: var(--ink-soft);
  font: inherit;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

h1 {
  font-size: 1.85rem;
  line-height: 1.25;
  margin: 1.5rem 0 0.4rem;
  letter-spacing: -0.03em;
}

.meta {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin-bottom: 1.75rem;
}

h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.55rem;
  letter-spacing: -0.02em;
}

p, li { color: var(--ink); }
ul { padding-left: 1.2rem; }
li { margin: 0.35rem 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem 1.2rem;
  margin: 1rem 0 1.5rem;
}

.card strong { color: var(--accent); }

.home-hero {
  margin-top: 1.5rem;
}

.home-hero p.lead {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 36rem;
}

.links {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.links a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.links a:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  text-decoration: none;
}

.links a span {
  display: block;
  color: var(--ink-soft);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

footer.site-footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 0.88rem;
}

[hidden] { display: none !important; }

@media (max-width: 520px) {
  h1 { font-size: 1.55rem; }
  nav { width: 100%; }
}