:root {
  --ink: #172322;
  --muted: #596866;
  --paper: #f7faf8;
  --surface: #ffffff;
  --line: #d7e1de;
  --deep: #102928;
  --deep-2: #173b38;
  --accent: #1a8f7a;
  --accent-soft: #dff3ed;
  --warn: #9a5a17;
  --warn-bg: #fff3df;
  --danger: #9b3b36;
  --danger-bg: #fff0ee;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.78;
  letter-spacing: 0;
}

a {
  color: #086b5b;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #064f44;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 20;
  padding: 8px 12px;
  color: var(--ink);
  background: #ffffff;
}

.skip-link:focus {
  left: 8px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  color: #ffffff;
  background: rgba(16, 41, 40, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-weight: 760;
  text-decoration: none;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border: 3px solid #79d6c4;
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(121, 214, 196, 0.16);
}

.site-nav {
  display: flex;
  gap: 22px;
}

.site-nav a {
  color: #d8ebe7;
  font-size: 15px;
  text-decoration: none;
}

.site-nav a:hover {
  color: #ffffff;
}

.page-shell {
  min-height: 70vh;
}

.content-width,
.article-page {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
}

.article-page {
  padding: 72px 0 84px;
}

.hero {
  color: #ffffff;
  background:
    linear-gradient(
      90deg,
      rgba(16, 41, 40, 0.98),
      rgba(16, 41, 40, 0.84)
    ),
    repeating-linear-gradient(
      135deg,
      transparent 0 26px,
      rgba(121, 214, 196, 0.08) 26px 27px
    );
  overflow: hidden;
}

.hero-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 400px;
  margin: 0 auto;
  padding: 64px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  align-items: center;
  gap: 64px;
}

.eyebrow {
  margin: 0 0 14px;
  color: #8fe0d0;
  font-size: 14px;
  font-weight: 720;
}

h1,
h2,
h3 {
  line-height: 1.28;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 22px;
  font-size: 46px;
}

h2 {
  margin: 2.2em 0 0.75em;
  font-size: 29px;
}

h3 {
  margin: 1.7em 0 0.55em;
  font-size: 21px;
}

.hero h1 {
  max-width: 720px;
  color: #ffffff;
  font-size: 52px;
}

.hero-lead {
  max-width: 700px;
  margin: 0;
  color: #d9ebe7;
  font-size: 20px;
}

.signal-panel {
  padding: 26px 0 4px 26px;
  border-left: 1px solid rgba(255, 255, 255, 0.28);
}

.signal-panel strong {
  display: block;
  margin-bottom: 13px;
  color: #8fe0d0;
  font-size: 14px;
}

.signal-panel ol {
  margin: 0;
  padding-left: 1.2em;
}

.signal-panel li {
  margin: 9px 0;
}

.section {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section h2:first-child {
  margin-top: 0;
}

.section-intro {
  max-width: 760px;
  color: var(--muted);
}

.triage-list {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.triage-list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.triage-number {
  color: var(--accent);
  font-size: 14px;
  font-weight: 760;
}

.triage-list strong {
  display: block;
  font-size: 20px;
}

.triage-list p {
  margin: 4px 0 0;
  color: var(--muted);
}

.triage-list a {
  font-weight: 700;
  white-space: nowrap;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.guide-link {
  min-height: 180px;
  padding: 28px;
  color: var(--ink);
  text-decoration: none;
  background: var(--surface);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 160ms ease, transform 160ms ease;
}

.guide-link:hover {
  color: var(--ink);
  background: #eef8f4;
  transform: translateY(-2px);
}

.guide-link small {
  color: var(--accent);
  font-weight: 700;
}

.guide-link strong {
  display: block;
  margin: 8px 0 6px;
  font-size: 20px;
  line-height: 1.45;
}

.guide-link span {
  color: var(--muted);
}

.article-header {
  margin-bottom: 46px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.article-header h1 {
  max-width: 760px;
}

.article-deck {
  margin: 0;
  color: var(--muted);
  font-size: 20px;
}

.answer-box,
.note,
.warning,
.stop-box {
  margin: 28px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.answer-box strong,
.note strong,
.warning strong,
.stop-box strong {
  display: block;
  margin-bottom: 4px;
}

.warning {
  border-color: var(--warn);
  background: var(--warn-bg);
}

.stop-box {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.table-wrap {
  margin: 24px 0 34px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 16px;
}

th,
td {
  min-width: 145px;
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--line);
}

th {
  background: #eaf3f0;
}

code {
  padding: 0.12em 0.35em;
  color: #183b37;
  background: #e6efec;
  border-radius: 3px;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 18px;
  color: #e7f5f2;
  background: var(--deep);
  border-radius: 4px;
}

pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

.next-links {
  margin-top: 50px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.next-links a {
  display: inline-block;
  margin: 0 18px 8px 0;
  font-weight: 700;
}

.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 58px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.site-footer p {
  max-width: 640px;
  margin: 5px 0 0;
}

.footer-links {
  display: flex;
  gap: 18px;
  white-space: nowrap;
}

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

  .guide-link {
    transition: none;
  }
}

@media (max-width: 860px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    min-height: 62px;
  }

  .brand span:last-child {
    font-size: 15px;
  }

  .site-nav {
    gap: 13px;
  }

  .site-nav a {
    font-size: 13px;
  }

  .site-nav a:nth-child(2) {
    display: none;
  }

  .hero-inner {
    min-height: 0;
    padding: 40px 0 36px;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: start;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-lead {
    font-size: 18px;
  }

  .signal-panel {
    padding: 20px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.25);
  }

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 25px;
  }

  .section {
    padding: 52px 0;
  }

  .article-page {
    padding: 50px 0 64px;
  }

  .triage-list li {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
  }

  .triage-list a {
    grid-column: 2;
  }

  .guide-grid {
    grid-template-columns: 1fr;
  }

  .guide-link {
    min-height: 0;
  }

  .site-footer {
    flex-direction: column;
    padding-bottom: 38px;
  }
}