:root {
  --ink: #1e3335;
  --muted: #637375;
  --paper: #f3f1eb;
  --white: #ffffff;
  --line: #d8dcd7;
  --deep: #24484a;
  --teal: #3e7370;
  --amber: #ba7a39;
  --pale: #e7efea;
  --shadow: 0 26px 62px rgba(30, 51, 53, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: 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 var(--amber); outline-offset: 4px; }

.skip-link { position: fixed; z-index: 10; top: 1rem; left: 1rem; padding: 0.55rem 0.85rem; color: var(--white); background: var(--deep); 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(--deep); border-radius: 10px 10px 22px 10px; font-family: Georgia, serif; font-size: 0.87rem; 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: 0.06em; }
nav { display: flex; gap: 1.35rem; color: var(--muted); font-size: 0.92rem; }
nav a:hover { color: var(--deep); }

.hero { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: clamp(2rem, 7vw, 7rem); padding: clamp(4.7rem, 11vw, 8.3rem) 0 clamp(4rem, 8vw, 6.5rem); }
.eyebrow, .section-kicker, .panel-label { margin: 0 0 0.8rem; color: var(--amber); 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: 720px; margin-bottom: 1.25rem; font-size: clamp(2.5rem, 5.5vw, 4.6rem); 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(--deep); }
.button-primary:hover { background: var(--teal); }
.button-quiet { border-color: var(--line); background: rgba(255, 255, 255, 0.5); }
.button-quiet:hover { border-color: var(--deep); }

.hero-panel { position: relative; align-self: center; min-height: 340px; overflow: hidden; padding: 2rem; color: var(--white); background: var(--deep); box-shadow: var(--shadow); }
.hero-panel::after { position: absolute; right: -5rem; bottom: -8rem; width: 20rem; height: 20rem; border: 1px solid rgba(255, 255, 255, 0.28); border-radius: 50%; content: ""; }
.hero-panel h2 { position: relative; z-index: 1; margin: 5.2rem 0 0.8rem; font-size: 2rem; }
.hero-panel > p:not(.panel-label) { position: relative; z-index: 1; color: #d6e1de; font-size: 0.94rem; }
.panel-label { position: relative; z-index: 1; color: #e9b978; }
.stack-line { position: absolute; z-index: 1; left: 2rem; height: 3px; background: var(--amber); }
.line-one { top: 5.4rem; width: 36%; }
.line-two { top: 6.3rem; width: 56%; background: #83aaa6; }
.line-three { top: 7.2rem; width: 75%; background: #d9e3df; }

.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; }
.column-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.column-card { min-height: 245px; padding: 1.5rem; background: rgba(255, 255, 255, 0.68); border: 1px solid var(--line); }
.column-card.featured { color: var(--white); background: var(--teal); border-color: var(--teal); }
.card-number { color: var(--amber); font-family: Georgia, serif; font-size: 1.3rem; }
.featured .card-number { color: #f2c083; }
.column-card h3 { margin: 3rem 0 0.45rem; font-size: 1.15rem; font-weight: 620; }
.column-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.featured p { color: #e1ece9; }

.scope { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 4rem; }
.scope-copy > p:last-child { margin: 1rem 0 0; color: var(--muted); }
.scope-list { border-top: 1px solid var(--line); }
.scope-list > div { display: grid; grid-template-columns: 8rem 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.scope-list strong { font-size: 0.94rem; }
.scope-list span { color: var(--muted); font-size: 0.91rem; }

.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(--deep); }

@media (max-width: 760px) {
  .site-header { min-height: auto; padding: 1.2rem 0; }
  nav { display: none; }
  .hero, .intro, .scope { grid-template-columns: 1fr; gap: 2.2rem; }
  .hero { padding-top: 3.4rem; }
  .hero-panel { min-height: 290px; }
  .column-grid { grid-template-columns: 1fr; }
  .column-card { min-height: auto; }
  .column-card h3 { margin-top: 2.2rem; }
  .scope-list > div { grid-template-columns: 1fr; gap: 0.15rem; }
  .site-footer { flex-direction: column; }
  .footer-meta { justify-content: start; }
}