:root {
  --bg: #0b1020;
  --surface: #111a31;
  --text: #f4f1e8;
  --muted: #b8bed0;
  --accent: #a9b9ff;
  --line: rgba(244, 241, 232, 0.15);
  --sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: Georgia, "Noto Serif SC", "Songti SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 80% 5%, rgba(117, 132, 229, 0.15), transparent 21rem),
    radial-gradient(circle at 12% 88%, rgba(97, 125, 204, 0.08), transparent 24rem),
    var(--bg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}
a { color: inherit; }
.skip-link { position: fixed; z-index: 20; top: -4rem; left: 1rem; padding: .65rem 1rem; color: var(--bg); background: var(--text); }
.skip-link:focus { top: 1rem; }
.site-header, main, footer { width: min(1080px, calc(100% - 3rem)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 84px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: .7rem; font-family: var(--serif); font-size: 1.1rem; text-decoration: none; }
.brand small { display: block; margin-top: .05rem; color: var(--accent); font-family: var(--sans); font-size: .57rem; letter-spacing: .16em; }
.brand-mark { width: 15px; height: 15px; border: 1px solid var(--accent); transform: rotate(45deg); }
nav { display: flex; gap: 1.6rem; } nav a { color: var(--muted); font-size: .85rem; text-decoration: none; } nav a:hover, nav a:focus-visible { color: var(--text); }
.hero { display: flex; min-height: calc(100dvh - 84px); flex-direction: column; align-items: center; justify-content: center; padding: 7rem 0; text-align: center; }
.eyebrow { margin: 0 0 1.1rem; color: var(--accent); font-size: .68rem; font-weight: 700; letter-spacing: .15em; }
h1, h2, h3, p { margin-top: 0; } h1, h2, h3 { font-weight: 400; }
h1 { max-width: 9em; margin-bottom: 1.5rem; font-family: var(--serif); font-size: clamp(3.4rem, 8.5vw, 7.6rem); line-height: .98; letter-spacing: -.06em; }
h1 em { color: var(--accent); font-style: normal; }
.intro { max-width: 36rem; margin: 0 auto 2rem; color: var(--muted); font-size: 1.08rem; }
.primary-action { display: inline-flex; width: fit-content; align-items: center; gap: 2.4rem; min-height: 48px; padding: .7rem 1.05rem; color: var(--bg); background: var(--text); font-size: .9rem; font-weight: 700; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.primary-action:hover, .primary-action:focus-visible { background: var(--accent); transform: translateY(-2px); }
.principles, .start { padding: 7rem 0; border-top: 1px solid var(--line); }.section-heading { max-width: 46rem; }.section-heading h2, .start h2 { margin-bottom: 0; font-family: var(--serif); font-size: clamp(2.35rem, 5vw, 4.7rem); line-height: 1.08; letter-spacing: -.05em; }
.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 3.1rem; border-top: 1px solid var(--line); }.principle-grid article { min-height: 210px; padding: 1.2rem 1.2rem 1.2rem 0; border-right: 1px solid var(--line); }.principle-grid article:not(:first-child) { padding-left: 1.2rem; }.principle-grid article:last-child { border-right: 0; }.principle-grid span { color: var(--accent); font-size: .7rem; letter-spacing: .12em; }.principle-grid h3 { margin: 3.8rem 0 .55rem; font-family: var(--serif); font-size: 1.55rem; }.principle-grid p { color: var(--muted); font-size: .86rem; }
.start { display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: end; }.start > p { max-width: 34rem; margin: 0; color: var(--muted); font-size: 1.03rem; }
footer { display: flex; justify-content: space-between; padding: 2rem 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .66rem; letter-spacing: .13em; } footer a { color: var(--accent); text-decoration: none; }
@media (max-width: 760px) { .hero { min-height: auto; padding: 6rem 0; }.principles, .start { padding: 5rem 0; }.principle-grid { grid-template-columns: repeat(2, 1fr); }.principle-grid article:nth-child(2) { border-right: 0; }.principle-grid article:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }.start { grid-template-columns: 1fr; gap: 1.5rem; } }
@media (max-width: 480px) { .site-header, main, footer { width: min(100% - 2rem, 1080px); }.site-header { min-height: 76px; }.hero { padding: 4.8rem 0; }.principle-grid { grid-template-columns: 1fr; }.principle-grid article, .principle-grid article:not(:first-child) { min-height: 165px; padding: 1.2rem 0; border-right: 0; border-bottom: 1px solid var(--line); }.principle-grid article:last-child { border-bottom: 0; }.principle-grid h3 { margin-top: 1.9rem; } footer { flex-direction: column; gap: .65rem; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .01ms !important; } }