:root {
  --bg: #f7f4ef;
  --paper: #fffdf9;
  --ink: #1c1916;
  --muted: #5c564e;
  --line: #e4ddd3;
  --accent: #c45c26;
  --accent-soft: rgba(196, 92, 38, 0.08);
  --shadow: 0 18px 50px rgba(40, 28, 16, 0.08);
  --radius: 18px;
  --max: 720px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, #f0e6d8 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, #efe8df 0%, transparent 45%),
    var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Apple SD Gothic Neo", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

.page {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: 3rem 0 4.5rem;
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
}

.lang-switch a {
  color: var(--muted);
  text-decoration: none;
}

.lang-switch a:hover,
.lang-switch a[aria-current="page"] {
  color: var(--accent);
}

.lang-switch a[aria-current="page"] {
  font-weight: 650;
}

header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.25;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.intro {
  margin: 0 0 2rem;
  padding: 1.25rem 1.35rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--muted);
}

.intro p {
  margin: 0 0 0.75rem;
}

.intro p:last-child {
  margin-bottom: 0;
}

section {
  margin-bottom: 2rem;
}

h2 {
  margin: 0 0 0.85rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 650;
}

p {
  margin: 0 0 0.85rem;
  color: var(--ink);
}

ul {
  margin: 0 0 0.85rem;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.45rem;
}

li::marker {
  color: var(--accent);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration: none;
}

footer {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.redirect {
  max-width: 28rem;
  margin: 20vh auto 0;
  padding: 0 1.25rem;
  text-align: center;
  color: var(--muted);
}

.redirect a {
  display: inline-block;
  margin-top: 0.75rem;
}

@media (max-width: 480px) {
  .page {
    width: min(100% - 1.25rem, var(--max));
    padding-top: 2rem;
  }

  .intro {
    padding: 1rem 1.05rem;
  }
}