:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #667085;
  --line: #d9e1ec;
  --accent: #0f6b5f;
  --accent-strong: #0a4b43;
  --blue: #1c4f9c;
  --amber: #a15c00;
  --shadow: 0 20px 60px rgba(22, 34, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(15, 107, 95, 0.08), rgba(15, 107, 95, 0) 360px),
    var(--bg);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header,
main,
.site-footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
  line-height: 1.25;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  font-size: 15px;
}

.site-nav a {
  color: #344054;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: center;
  padding: 44px 0 30px;
}

.intro-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.22;
}

h1 {
  max-width: 760px;
  font-size: 46px;
}

.lead {
  max-width: 780px;
  margin: 22px 0 0;
  color: #3f4d5f;
  font-size: 18px;
}

.hero-visual,
.profile-panel,
.icp-card,
.topic-grid article,
.note-list {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.intro-aside {
  display: grid;
  gap: 14px;
}

.hero-visual {
  margin: 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 760 / 540;
  object-fit: cover;
}

.profile-panel {
  padding: 26px;
}

dl {
  margin: 0;
}

.profile-panel dl,
.icp-card dl {
  display: grid;
  gap: 16px;
}

dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

dd {
  margin: 4px 0 0;
  color: var(--text);
  font-size: 16px;
  font-weight: 700;
}

.section {
  margin-top: 28px;
  padding: 42px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 22px;
}

.section-heading h2 {
  font-size: 30px;
}

.section-heading p:not(.eyebrow) {
  margin: 12px 0 0;
  color: var(--muted);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.topic-grid article {
  min-height: 220px;
  padding: 24px;
}

.topic-icon {
  display: inline-grid;
  width: 42px;
  height: 32px;
  place-items: center;
  border-radius: 6px;
  color: var(--accent-strong);
  background: #e3f2ef;
  font-weight: 800;
}

.topic-grid h3 {
  margin-top: 20px;
  font-size: 20px;
}

.topic-grid p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 28px;
  align-items: start;
}

.note-list {
  padding: 24px;
}

.note-list p {
  margin: 0;
  color: #3f4d5f;
}

.note-list p + p {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.icp-section {
  margin-bottom: 20px;
}

.icp-card {
  padding: 28px;
  border-color: #cbd8e8;
}

.icp-card dl {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.icp-card p {
  margin: 24px 0 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent);
  color: #3f4d5f;
  background: #f0f7f5;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0 36px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .intro,
  .split-section {
    grid-template-columns: 1fr;
  }

  .intro {
    padding: 36px;
  }

  h1 {
    font-size: 38px;
  }

  .topic-grid,
  .icp-card dl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header,
  main,
  .site-footer {
    width: min(100% - 28px, 1120px);
  }

  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .intro {
    padding: 28px 22px;
  }

  h1 {
    font-size: 31px;
  }

  .lead {
    font-size: 16px;
  }

  .topic-grid,
  .icp-card dl {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 30px 0;
  }

  .topic-grid article {
    min-height: 0;
  }
}