:root {
  --bg: #f6f2ea;
  --bg-soft: #fbfaf7;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --border: #e7e1d6;
  --border-strong: #d9e2ec;
  --text: #0f172a;
  --muted: #475569;
  --muted-soft: #64748b;
  --brand-sky: #7dd3fc;
  --brand-sea: #93c5fd;
  --brand-sun: #fde68a;
  --brand-emerald: #99f6e4;
  --accent: #0f766e;
  --accent-warm: #9a3412;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 28px rgba(15, 23, 42, 0.05);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --content-width: 1200px;
  --article-width: 780px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(125, 211, 252, 0.20), transparent 32%),
    radial-gradient(circle at top right, rgba(253, 230, 138, 0.22), transparent 26%),
    linear-gradient(180deg, #f8f5ef 0%, #fbfaf7 28%, #f8fafc 100%);
  font-family: "Noto Serif SC", "Source Han Serif SC", "PingFang SC", "Microsoft YaHei", serif;
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.site-shell,
.page-shell {
  width: min(var(--content-width), calc(100vw - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 18px;
}

.brand-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand-sky), var(--brand-sun));
  box-shadow: 0 0 0 8px rgba(255, 255, 255, 0.6);
}

.hero {
  position: relative;
  overflow: hidden;
  border-radius: 34px;
  padding: 38px 34px 96px;
  background: linear-gradient(135deg, #7dd3fc 0%, #93c5fd 30%, #fde68a 100%);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -24% auto;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  filter: blur(6px);
}

.hero__eyebrow,
.article-hero__eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(30, 41, 59, 0.72);
}

.hero__title,
.article-hero__title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 680px;
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.06;
  font-weight: 900;
}

.hero__lead,
.article-hero__lead {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 16px 0 0;
  font-size: 16px;
  color: rgba(30, 41, 59, 0.82);
}

.hero__chips,
.article-hero__tags {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.chip,
.article-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.78);
  color: #164e63;
  font-size: 12px;
  white-space: nowrap;
}

.hero__aside {
  position: absolute;
  right: 28px;
  bottom: 22px;
  z-index: 1;
  width: min(220px, 36vw);
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(8px);
}

.hero__aside-title {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--muted-soft);
}

.hero__aside-body {
  margin: 0;
  font-size: 13px;
  color: #334155;
  line-height: 1.8;
}

.hero-cards {
  margin-top: -54px;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.guide-card,
.panel,
.toc-card,
.article-panel,
.article-block,
.article-callout {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(8px);
}

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border-radius: var(--radius-lg);
  min-height: 244px;
}

.guide-card__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.guide-card__title {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  font-weight: 800;
}

.guide-card__summary {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.guide-card__kicker {
  margin: auto 0 0;
  font-size: 13px;
  color: var(--accent);
  font-weight: 700;
}

.guide-card__meta,
.guide-card__stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.guide-stat {
  padding: 8px 10px;
  border-radius: 14px;
  background: #fcfcfb;
  border: 1px solid #ece7de;
  min-width: 96px;
}

.guide-stat__label {
  display: block;
  font-size: 11px;
  color: var(--muted-soft);
}

.guide-stat__value {
  display: block;
  font-size: 13px;
  color: var(--text);
  font-weight: 700;
}

.home-sections {
  padding: 20px 0 50px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 16px;
}

.panel {
  border-radius: var(--radius-lg);
  padding: 20px;
}

.panel h2,
.panel h3,
.article-panel h2,
.article-panel h3,
.toc-card h2,
.toc-card h3,
.article-callout h3 {
  margin-top: 0;
  line-height: 1.25;
}

.panel p,
.article-panel p,
.toc-card p,
.article-callout p {
  margin-bottom: 0;
  color: var(--muted);
}

.page-shell--article {
  padding-bottom: 56px;
}

.article-hero {
  position: relative;
  overflow: hidden;
  margin-top: 14px;
  padding: 28px 30px 26px;
  border-radius: 30px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(191, 219, 254, 0.48) 0%, rgba(254, 243, 199, 0.38) 100%);
  box-shadow: var(--shadow-soft);
}

.article-hero__meta {
  margin-top: 18px;
  font-size: 14px;
  color: var(--muted);
}

.article-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  margin-top: 20px;
}

.article-sidebar {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 16px;
}

.toc-card,
.article-callout {
  border-radius: 20px;
  padding: 16px;
}

.toc-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.toc-list li + li {
  margin-top: 8px;
}

.toc-list a {
  display: block;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.toc-list a:hover,
.breadcrumbs a:hover,
.guide-card:hover .guide-card__title {
  color: var(--accent);
}

.toc-list .toc-level-3 {
  padding-left: 14px;
  font-size: 13px;
}

.toc-list .toc-level-4 {
  padding-left: 28px;
  font-size: 13px;
}

.article-main {
  min-width: 0;
}

.article-main > * + * {
  margin-top: 16px;
}

.article-panel {
  border-radius: 22px;
  padding: 18px;
}

.breadcrumbs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--muted-soft);
  margin: 18px 0 0;
}

.article-content {
  display: grid;
  gap: 18px;
}

.article-block {
  border-radius: 22px;
  padding: 22px;
  overflow: hidden;
}

.article-block > :first-child {
  margin-top: 0;
}

.article-block > :last-child {
  margin-bottom: 0;
}

.article-block--prose p {
  margin: 0;
  font-size: 16px;
  color: #334155;
}

.article-block--quote blockquote {
  margin: 0;
  padding-left: 16px;
  border-left: 4px solid #fbbf24;
  color: #475569;
}

.article-block--hr {
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}

.article-block--hr hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #d6d3d1, transparent);
}

.article-block--table {
  padding: 0;
}

.article-block--table table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
  background: white;
}

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

.article-block--table thead {
  background: linear-gradient(90deg, #eff6ff 0%, #fef3c7 100%);
}

.article-block--table th,
.article-block--table td {
  padding: 12px 14px;
  border-top: 1px solid #ece7de;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.article-block--table tr:first-child th,
.article-block--table thead tr:first-child td {
  border-top: none;
}

.article-block--list ul,
.article-block--list ol {
  margin: 0;
  padding-left: 22px;
  color: #334155;
}

.article-block--list li + li {
  margin-top: 8px;
}

.article-block--code {
  padding: 0;
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  border-color: #0f172a;
}

.article-block--code pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
}

.article-block--code code,
.article-content code {
  font-family: "Iosevka", "JetBrains Mono", "Fira Code", monospace;
}

.article-block--code code {
  color: #e2e8f0;
  font-size: 13px;
}

.article-content :not(pre) > code {
  padding: 2px 7px;
  border-radius: 8px;
  background: #f1f5f9;
  color: #0f172a;
  font-size: 0.95em;
}

.article-content strong {
  color: #0f172a;
}

.article-content h2,
.article-content h3,
.article-content h4 {
  margin: 0 0 12px;
  line-height: 1.25;
}

.article-content h2 {
  font-size: clamp(24px, 3vw, 32px);
}

.article-content h3 {
  font-size: 21px;
}

.article-content h4 {
  font-size: 18px;
}

.article-content p + p {
  margin-top: 12px;
}

.article-footer {
  padding: 18px 0 0;
  color: var(--muted-soft);
  font-size: 13px;
}

input[type="checkbox"] {
  margin-right: 8px;
}

@media (max-width: 1080px) {
  .hero__aside {
    position: static;
    width: auto;
    margin-top: 18px;
  }

  .hero-cards,
  .home-sections,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
    order: 2;
  }

  .article-main {
    order: 1;
  }
}

@media (max-width: 720px) {
  .site-shell,
  .page-shell {
    width: min(var(--content-width), calc(100vw - 20px));
  }

  .site-header {
    padding-top: 18px;
  }

  .hero,
  .article-hero {
    border-radius: 24px;
    padding: 24px 20px;
  }

  .hero-cards {
    margin-top: -30px;
  }

  .guide-card,
  .panel,
  .toc-card,
  .article-panel,
  .article-block,
  .article-callout {
    border-radius: 18px;
  }

  .article-block {
    padding: 18px;
  }

  .brand-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}