:root {
  --ink: #18302f;
  --muted: #5c6e6d;
  --paper: #f6f5ef;
  --white: #ffffff;
  --line: #d8dfd8;
  --forest: #0c423f;
  --mint: #dceae3;
  --gold: #b37a32;
  --shadow: 0 24px 60px rgba(20, 57, 52, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 0%, rgba(177, 211, 196, 0.35), transparent 24rem),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

a { color: inherit; text-decoration: none; }

a:focus-visible { outline: 3px solid #d18d35; outline-offset: 4px; }

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.55rem 0.85rem;
  color: var(--white);
  background: var(--forest);
  transform: translateY(-180%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.hero,
.section,
.site-footer {
  width: min(1120px, calc(100% - 3rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 90px;
}

.brand { display: inline-flex; align-items: center; gap: 0.75rem; }

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--white);
  background: var(--forest);
  border-radius: 50% 50% 50% 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.88rem;
  letter-spacing: 0.06em;
}

.brand strong,
.brand small { display: block; line-height: 1.15; }
.brand strong { font-size: 1.05rem; font-weight: 650; }
.brand small { margin-top: 0.18rem; color: var(--muted); font-family: Georgia, serif; font-size: 0.78rem; letter-spacing: 0.08em; }

nav { display: flex; gap: 1.35rem; color: var(--muted); font-size: 0.92rem; }
nav a:hover { color: var(--forest); }

.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: clamp(2rem, 6vw, 6.5rem);
  padding: clamp(4.7rem, 11vw, 8.3rem) 0 clamp(4rem, 8vw, 6.5rem);
}

.eyebrow,
.section-kicker,
.note-label {
  margin: 0 0 0.8rem;
  color: var(--gold);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

h1, h2, h3, p { margin-top: 0; }

h1,
h2 {
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-weight: 500;
  letter-spacing: -0.035em;
}

h1 { max-width: 750px; margin-bottom: 1.25rem; font-size: clamp(2.5rem, 5.6vw, 4.7rem); line-height: 1.13; }
h2 { margin-bottom: 0; font-size: clamp(1.75rem, 3vw, 2.65rem); line-height: 1.25; }
.hero-lead { max-width: 650px; margin-bottom: 1.8rem; color: var(--muted); font-size: 1.08rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0.7rem 1.05rem; border: 1px solid transparent; font-size: 0.92rem; }
.button-primary { color: var(--white); background: var(--forest); }
.button-primary:hover { background: #155953; }
.button-quiet { border-color: var(--line); background: rgba(255, 255, 255, 0.5); }
.button-quiet:hover { border-color: var(--forest); }

.hero-note { align-self: center; padding: 1.9rem; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); }
.hero-note h2 { margin-bottom: 0.65rem; font-size: 1.75rem; }
.hero-note > p:not(.note-label) { color: var(--muted); font-size: 0.94rem; }
dl { margin: 1.4rem 0 0; }
dl div { display: flex; justify-content: space-between; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--line); font-size: 0.86rem; }
dt { color: var(--muted); }
dd { margin: 0; text-align: right; }

.section { padding: clamp(3.3rem, 8vw, 6rem) 0; border-top: 1px solid var(--line); }
.intro { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 4rem; }
.intro > p { max-width: 600px; margin-bottom: 0; color: var(--muted); font-size: 1.05rem; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 1.8rem; }

.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.topic-card { min-height: 230px; padding: 1.5rem; background: rgba(255, 255, 255, 0.7); border: 1px solid var(--line); }
.card-index { color: var(--gold); font-family: Georgia, serif; font-size: 1.3rem; }
.topic-card h3 { margin: 3rem 0 0.45rem; font-size: 1.15rem; font-weight: 620; }
.topic-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.notice { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 4rem; }
.notice ul { margin: 0; padding: 0; list-style: none; }
.notice li { position: relative; padding: 0.95rem 0 0.95rem 1.45rem; border-top: 1px solid var(--line); color: var(--muted); }
.notice li::before { position: absolute; left: 0; color: var(--forest); content: "—"; }

.site-footer { display: flex; justify-content: space-between; gap: 1.5rem; padding: 2rem 0 2.6rem; color: var(--muted); border-top: 1px solid var(--line); font-size: 0.82rem; }
.site-footer strong { margin-right: 0.6rem; color: var(--ink); font-size: 0.92rem; }
.footer-meta { display: flex; flex-wrap: wrap; justify-content: end; gap: 0.85rem 1.1rem; }
.footer-meta a:hover { color: var(--forest); }

@media (max-width: 760px) {
  .site-header { min-height: auto; padding: 1.2rem 0; }
  nav { display: none; }
  .hero, .intro, .notice { grid-template-columns: 1fr; gap: 2.2rem; }
  .hero { padding-top: 3.4rem; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { min-height: auto; }
  .topic-card h3 { margin-top: 2.2rem; }
  .site-footer { flex-direction: column; }
  .footer-meta { justify-content: start; }
}