:root {
  --brand: #1769e0;
  --brand-dark: #0d3f96;
  --brand-soft: #eaf3ff;
  --accent: #00a8a8;
  --ink: #172033;
  --muted: #5d6b7a;
  --line: #dbe6f2;
  --bg: #f6f9fd;
  --surface: #ffffff;
  --success: #147a55;
  --shadow: 0 14px 36px rgba(19, 58, 108, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(219, 230, 242, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1120px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-size: 17px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px 16px;
}

.nav-links a {
  color: #2a3850;
  font-size: 14px;
  font-weight: 650;
}

.nav-links a[aria-current="page"] {
  color: var(--brand);
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #edf6ff 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 32px;
  align-items: center;
  padding: 58px 0 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0 0 14px;
  padding: 4px 10px;
  border: 1px solid rgba(23, 105, 224, 0.22);
  border-radius: 999px;
  color: var(--brand-dark);
  background: #fff;
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.24;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(32px, 5vw, 52px);
}

.hero p {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.hero-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-panel-header {
  padding: 16px 18px;
  color: #fff;
  background: var(--brand);
  font-weight: 750;
}

.hero-panel-body {
  padding: 18px;
}

.status-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.status-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.status-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.status-list span {
  color: var(--muted);
  font-size: 13px;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid var(--brand);
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
}

.btn:hover {
  color: #fff;
  background: var(--brand-dark);
  border-color: var(--brand-dark);
}

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

.btn.secondary:hover {
  color: #fff;
  background: var(--brand-dark);
}

.btn.ghost {
  color: var(--ink);
  border-color: var(--line);
  background: #fff;
}

.btn.ghost:hover {
  color: var(--brand-dark);
  border-color: var(--brand);
}

.section {
  padding: 42px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.section-head p {
  max-width: 620px;
  margin: 8px 0 0;
  color: var(--muted);
}

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

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

.grid.categories {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.card {
  display: flex;
  min-width: 0;
  height: 100%;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 6px 24px rgba(19, 58, 108, 0.05);
}

.card-body {
  display: flex;
  height: 100%;
  flex-direction: column;
  padding: 18px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tag {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  font-size: 12px;
  font-weight: 750;
}

.tag.neutral {
  color: #415066;
  background: #eef2f6;
}

.post-card h3 {
  font-size: 18px;
}

.post-card p,
.category-card p,
.sidebar-card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.post-meta,
.article-meta,
.category-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.card-link {
  margin-top: auto;
  padding-top: 16px;
  font-size: 14px;
  font-weight: 750;
}

.category-card {
  min-height: 132px;
}

.category-card h3 {
  font-size: 16px;
}

.category-count {
  margin-top: auto;
  padding-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.sidebar {
  display: grid;
  gap: 16px;
}

.sidebar-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
}

.sidebar-card h2,
.sidebar-card h3 {
  font-size: 18px;
}

.link-list {
  display: grid;
  gap: 12px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.link-list a {
  display: block;
  color: var(--ink);
  font-weight: 650;
}

.link-list span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.download-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  padding: 26px 0;
}

.download-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

.site-footer {
  padding: 28px 0 34px;
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0;
  color: var(--muted);
  font-size: 14px;
}

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

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 28px;
  align-items: start;
  padding-bottom: 48px;
}

.article-main {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.article-head {
  padding: 30px 30px 22px;
  border-bottom: 1px solid var(--line);
}

.article-head h1 {
  font-size: clamp(28px, 4vw, 42px);
}

.article-summary {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.article-body {
  padding: 28px 30px 10px;
}

.article-body h2 {
  margin-top: 34px;
  padding-top: 8px;
  font-size: 24px;
  scroll-margin-top: 92px;
}

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

.article-body h3 {
  margin-top: 24px;
  font-size: 19px;
}

.article-body p {
  margin: 14px 0;
}

.article-body ul,
.article-body ol {
  padding-left: 1.3em;
}

.article-body li {
  margin: 8px 0;
}

.article-body strong {
  color: var(--ink);
}

.notice {
  margin: 22px 0;
  padding: 14px 16px;
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  background: var(--brand-soft);
  color: #244466;
}

.article-aside {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 16px;
}

.toc,
.related,
.article-download {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
}

.toc h2,
.related h2,
.article-download h2 {
  font-size: 18px;
}

.toc ol {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding-left: 1.2em;
}

.toc a {
  color: #2a3850;
  font-size: 14px;
  font-weight: 650;
}

.related {
  margin: 20px 30px 30px;
}

.article-download {
  margin: 20px 30px 30px;
  background: linear-gradient(180deg, #ffffff 0%, #eff7ff 100%);
}

.article-download p {
  margin: 10px 0 0;
  color: var(--muted);
}

.category-hero {
  padding: 42px 0 30px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.empty-state {
  padding: 22px;
  border: 1px dashed #b9c9dc;
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
}

@media (max-width: 980px) {
  .hero-inner,
  .content-layout,
  .article-shell,
  .download-card {
    grid-template-columns: 1fr;
  }

  .article-aside {
    position: static;
    order: -1;
  }

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

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

@media (max-width: 680px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 12px 0;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .hero-inner {
    padding: 40px 0 34px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .section {
    padding: 30px 0;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .grid.posts,
  .grid.categories {
    grid-template-columns: 1fr;
  }

  .article-head,
  .article-body {
    padding-right: 18px;
    padding-left: 18px;
  }

  .related,
  .article-download {
    margin-right: 18px;
    margin-left: 18px;
  }

  .btn {
    width: 100%;
  }
}