:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-soft: #f1f5f9;
  --border: #dbe3ee;
  --text: #122033;
  --muted: #4c5e76;
  --brand: #176b5b;
  --brand-strong: #0f5a4c;
  --accent: #d8efe8;
  --shadow: 0 18px 60px rgba(18, 32, 51, 0.08);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(23, 107, 91, 0.09), transparent 28%),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 100%);
  line-height: 1.75;
}

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

a:hover {
  color: var(--brand-strong);
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(251, 252, 254, 0.92);
  border-bottom: 1px solid rgba(219, 227, 238, 0.9);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand__mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, #176b5b 0%, #3d8577 100%);
  color: #fff;
  font-weight: 700;
  font-size: 20px;
}

.brand__title {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
}

.brand__subtitle {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

.nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover,
.nav a.is-strong {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 6px 24px rgba(18, 32, 51, 0.06);
}

.hero {
  padding: 54px 0 30px;
}

.hero__card,
.panel,
.tool-card,
.qa,
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.hero__card {
  border-radius: 32px;
  padding: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero h1,
.page-hero h1 {
  margin: 18px 0 12px;
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.08;
}

.hero p,
.page-hero p,
.panel p,
.content-card p,
.tool-card p,
.qa p {
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--brand);
  color: #fff;
}

.btn--secondary {
  background: var(--surface-soft);
  color: var(--text);
  border-color: var(--border);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.metric {
  padding: 18px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbfd 100%);
  border: 1px solid var(--border);
}

.metric strong {
  display: block;
  font-size: 28px;
  line-height: 1;
  margin-bottom: 8px;
}

.section {
  padding: 14px 0 22px;
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section__head h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.section__hint {
  max-width: 660px;
  margin: 0;
}

.panel,
.content-card {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.grid {
  display: grid;
  gap: 18px;
}

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

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

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.tool-card {
  border-radius: var(--radius-md);
  padding: 22px;
}

.tool-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e8f3f0;
  color: var(--brand-strong);
  font-size: 12px;
  font-weight: 700;
}

.tool-card h3,
.content-card h2,
.content-card h3,
.qa h3 {
  margin: 0 0 10px;
  line-height: 1.3;
}

.tool-card__path {
  display: inline-block;
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
  word-break: break-all;
}

.list {
  margin: 0;
  padding-left: 18px;
}

.list li + li {
  margin-top: 10px;
}

.qa-list {
  display: grid;
  gap: 16px;
}

.qa {
  border-radius: var(--radius-md);
  padding: 22px;
}

.page-hero {
  padding: 42px 0 18px;
}

.page-hero__card {
  border-radius: 28px;
  padding: 28px;
  background: linear-gradient(135deg, rgba(23, 107, 91, 0.08), rgba(216, 239, 232, 0.9));
  border: 1px solid rgba(23, 107, 91, 0.14);
}

.meta-note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.callout {
  padding: 16px 18px;
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: #eef7f4;
  color: var(--text);
}

.site-footer {
  padding: 28px 0 40px;
  color: var(--muted);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 980px) {
  .metrics,
  .tool-grid,
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section__head,
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (max-width: 680px) {
  .shell {
    width: min(100% - 24px, 1180px);
  }

  .hero__card,
  .panel,
  .content-card,
  .page-hero__card {
    padding: 22px;
  }

  .metrics,
  .tool-grid,
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 28px;
  }

  .hero__actions,
  .nav,
  .site-footer__links {
    gap: 10px;
  }
}