* {
  box-sizing: border-box;
}

:root {
  --bg: #f6f8f7;
  --paper: #ffffff;
  --ink: #18212a;
  --muted: #65717d;
  --line: #dfe6e2;
  --green: #1f6f58;
  --blue: #245f9d;
  --orange: #c66a1f;
  --shadow: 0 18px 44px rgba(18, 34, 45, 0.08);
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  padding-bottom: 58px;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(1680px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a {
  color: var(--muted);
}

.layout {
  width: min(1680px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 32px;
  align-items: stretch;
  padding: 56px 0 36px;
}

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

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 4.3vw, 58px);
}

.hero-copy p {
  margin: 18px 0 0;
  max-width: 660px;
  color: var(--muted);
  font-size: 18px;
}

.hero-panel {
  background:
    linear-gradient(135deg, rgba(31, 111, 88, 0.10), transparent 45%),
    linear-gradient(225deg, rgba(198, 106, 31, 0.12), transparent 50%),
    var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.hero-panel ul {
  margin: 0;
  padding-left: 19px;
  color: var(--muted);
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 28px 0 16px;
}

.section-title h2 {
  margin: 0;
  font-size: 26px;
}

.section-title p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

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

.article-grid.compact .card {
  min-height: 232px;
}

.card {
  display: flex;
  flex-direction: column;
  min-height: 260px;
  padding: 22px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(18, 34, 45, 0.06);
}

.card .tag {
  align-self: flex-start;
  margin-bottom: 18px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card a.read-more {
  margin-top: auto;
  padding-top: 22px;
  font-weight: 800;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 2px 9px;
  color: var(--green);
  background: rgba(31, 111, 88, 0.09);
  border: 1px solid rgba(31, 111, 88, 0.18);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.note {
  margin: 28px 0 48px;
  padding: 18px 20px;
  background: #f9fbfb;
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  border-radius: 8px;
  color: var(--muted);
}

.guide-band {
  margin: 34px 0;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 28px rgba(18, 34, 45, 0.05);
}

.guide-band h2 {
  margin: 0 0 14px;
  font-size: 24px;
}

.guide-links {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.guide-links a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 10px 12px;
  background: #f8faf9;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.article-shell {
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 64px;
}

.breadcrumbs {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.article {
  padding: 38px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.article h1 {
  font-size: clamp(32px, 4vw, 48px);
}

.article .meta {
  margin: 12px 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.article h2 {
  margin: 34px 0 12px;
  font-size: 25px;
}

.article h3 {
  margin: 24px 0 8px;
  font-size: 20px;
}

.article p {
  margin: 12px 0;
}

.article ul,
.article ol {
  padding-left: 22px;
}

.article li {
  margin: 8px 0;
}

.article blockquote {
  margin: 24px 0;
  padding: 16px 18px;
  background: #f8faf9;
  border-left: 4px solid var(--green);
  color: var(--muted);
}

.article table {
  width: 100%;
  margin: 20px 0;
  border-collapse: collapse;
  font-size: 15px;
}

.article th,
.article td {
  padding: 11px 12px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.article th {
  background: #f3f7f5;
  text-align: left;
  color: var(--ink);
}

.article td {
  color: #34404a;
}

.step-list {
  counter-reset: qnd-step;
  padding-left: 0;
  list-style: none;
}

.step-list li {
  position: relative;
  min-height: 42px;
  margin: 12px 0;
  padding-left: 46px;
}

.step-list li::before {
  counter-increment: qnd-step;
  content: counter(qnd-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(31, 111, 88, 0.10);
  color: var(--green);
  font-weight: 900;
}

.fact-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.fact {
  padding: 16px;
  background: #f8faf9;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.fact strong {
  display: block;
  margin-bottom: 6px;
}

.sources {
  margin-top: 38px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.sources h2 {
  margin-top: 0;
}

.sources a {
  word-break: break-word;
}

.next-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
}

.next-list a {
  padding: 14px 16px;
  background: #f8faf9;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.site-footer {
  width: min(1680px, calc(100% - 40px));
  margin: 28px auto 0;
  padding: 18px 0 36px;
  color: var(--muted);
  font-size: 14px;
}

.icp-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  justify-content: center;
  gap: 14px;
  padding: 9px 16px;
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  backdrop-filter: blur(10px);
}

.icp-bar a {
  color: var(--muted);
}

@media (max-width: 880px) {
  .hero,
  .article-grid,
  .guide-links {
    grid-template-columns: 1fr;
  }

  .fact-list,
  .next-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    padding-bottom: 82px;
  }

  .nav {
    width: min(100% - 28px, 1680px);
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
    gap: 12px;
  }

  .nav-links {
    justify-content: flex-start;
    gap: 10px 14px;
  }

  .layout,
  .article-shell,
  .site-footer {
    width: min(100% - 28px, 1680px);
  }

  .hero {
    padding: 36px 0 24px;
  }

  .hero-panel,
  .article,
  .card {
    padding: 20px;
  }

  .article table {
    display: block;
    overflow-x: auto;
  }

  .article th,
  .article td {
    min-width: 148px;
  }

  .icp-bar {
    flex-direction: column;
    align-items: center;
    gap: 2px;
  }
}