:root {
  --mist: #eef8f7;
  --mist-deep: #e2f1f0;
  --paper: rgba(255, 255, 255, 0.82);
  --ink: #173235;
  --muted: #60777a;
  --tide: #247c82;
  --tide-deep: #155e64;
  --moon: #d9a94a;
  --line: rgba(23, 50, 53, 0.12);
  --shadow: 0 24px 70px rgba(29, 82, 84, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% 4%, rgba(36, 124, 130, 0.12), transparent 28rem),
    linear-gradient(180deg, #f7fbfb 0%, var(--mist) 52%, #f8fbfb 100%);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: var(--tide-deep);
  text-underline-offset: 0.2em;
}

a:focus-visible {
  outline: 3px solid rgba(36, 124, 130, 0.35);
  outline-offset: 4px;
  border-radius: 4px;
}

.shell {
  width: min(100% - 36px, 920px);
  margin: 0 auto;
  padding: 28px 0 64px;
}

.topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 54px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 31px;
  height: 31px;
  border: 2px solid var(--tide);
  border-radius: 11px;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
}

.brand-mark::before {
  width: 12px;
  height: 12px;
  top: 7px;
  left: 7px;
  border: 3px solid var(--moon);
  border-top-color: transparent;
  border-radius: 50%;
  transform: rotate(35deg);
}

.brand-mark::after {
  width: 15px;
  height: 2px;
  left: 6px;
  bottom: 5px;
  border-radius: 999px;
  background: var(--tide);
}

.topnav {
  display: flex;
  gap: 18px;
  font-size: 0.92rem;
}

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

.hero {
  position: relative;
  isolation: isolate;
  margin: 46px 0 24px;
  padding: clamp(34px, 7vw, 68px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 36px;
  background: var(--paper);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: 260px;
  height: 260px;
  right: -74px;
  top: -92px;
  border: 1px solid rgba(36, 124, 130, 0.22);
  border-radius: 50%;
  box-shadow:
    0 0 0 34px rgba(36, 124, 130, 0.045),
    0 0 0 68px rgba(36, 124, 130, 0.028);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--tide);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-weight: 700;
}

h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.lede {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.5vw, 1.16rem);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 28px;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.78rem;
}

.content {
  display: grid;
  gap: 14px;
}

.section {
  padding: clamp(24px, 5vw, 38px);
  border: 1px solid rgba(255, 255, 255, 0.88);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.72);
}

.section h2 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  line-height: 1.35;
}

.section p {
  margin: 0;
}

.section p + p,
.section p + ul,
.section ul + p {
  margin-top: 12px;
}

.section ul {
  margin-bottom: 0;
  padding-left: 1.25em;
}

.section li + li {
  margin-top: 8px;
}

.callout {
  border-color: rgba(36, 124, 130, 0.18);
  background: linear-gradient(135deg, rgba(226, 241, 240, 0.95), rgba(255, 255, 255, 0.82));
}

.contact {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  margin-top: 18px;
  padding: 0 18px;
  border-radius: 999px;
  color: #fff;
  background: var(--tide);
  box-shadow: 0 10px 28px rgba(36, 124, 130, 0.2);
  font-weight: 700;
  text-decoration: none;
}

.contact:hover {
  background: var(--tide-deep);
}

.footnote {
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 24px, 920px);
    padding-top: 16px;
  }

  .topline {
    align-items: flex-start;
  }

  .topnav {
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
  }

  .hero {
    margin-top: 26px;
    border-radius: 28px;
  }

  h1 {
    font-size: 2.2rem;
    letter-spacing: -0.03em;
  }

  .section {
    border-radius: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}