:root {
  --bg: #efe8db;
  --bg-soft: rgba(255, 250, 242, 0.78);
  --paper: rgba(255, 252, 247, 0.88);
  --paper-strong: #fffdf8;
  --line: rgba(71, 56, 38, 0.14);
  --line-strong: rgba(71, 56, 38, 0.25);
  --text: #2b241d;
  --muted: #6b6259;
  --accent: #8f4a24;
  --accent-soft: rgba(143, 74, 36, 0.12);
  --shadow: 0 20px 50px rgba(72, 52, 33, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --sidebar-width: 290px;
  --content-width: 920px;
  --font-sans: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --font-serif: "Iowan Old Style", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  overflow-x: hidden;
  background:
    radial-gradient(circle at top left, rgba(197, 143, 99, 0.22), transparent 28rem),
    linear-gradient(180deg, #f6f0e5 0%, #efe8db 100%);
  font-family: var(--font-sans);
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

img,
video {
  display: block;
  width: 100%;
  max-width: 100%;
  border-radius: 16px;
}

audio {
  width: 100%;
}

code,
pre {
  font-family: var(--font-mono);
}

pre {
  position: relative;
  overflow-x: auto;
  margin: 1.25rem 0;
  padding: 1.2rem 1.1rem;
  border: 1px solid rgba(45, 37, 29, 0.1);
  border-radius: 16px;
  background: #1d1b19;
  color: #f7f2e8;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

pre code {
  font-size: 0.93rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

th,
td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: rgba(97, 72, 38, 0.06);
}

figure {
  margin: 1.5rem 0;
}

figcaption {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.site-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(122, 89, 60, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 89, 60, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.4), transparent 85%);
}

.site-shell {
  display: grid;
  grid-template-columns: minmax(220px, var(--sidebar-width)) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 1.6rem;
  border-right: 1px solid var(--line);
  background: rgba(248, 242, 232, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand strong {
  display: block;
  font-size: 1.05rem;
}

.brand small {
  color: var(--muted);
}

.brand.compact {
  padding: 0 1.1rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.7rem;
  height: 2.7rem;
  border: 1px solid rgba(101, 65, 32, 0.2);
  border-radius: 50%;
  background: linear-gradient(135deg, #fff5e6, #f1d6b7);
  font-family: var(--font-serif);
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.search {
  display: grid;
  gap: 0.55rem;
  margin: 1.9rem 0 1.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.search input {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid rgba(98, 73, 45, 0.18);
  border-radius: 14px;
  background: rgba(255, 253, 249, 0.85);
  font: inherit;
  font-size: 16px;
}

.search input:focus {
  outline: 2px solid rgba(143, 74, 36, 0.18);
  border-color: rgba(143, 74, 36, 0.35);
}

.side-section {
  margin-top: 1.6rem;
}

.side-section p {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.side-section a {
  display: block;
  padding: 0.66rem 0.8rem;
  margin-bottom: 0.45rem;
  border-radius: 12px;
  color: inherit;
}

.side-section a:hover,
.side-section a.is-match {
  background: rgba(143, 74, 36, 0.08);
  text-decoration: none;
}

.compact-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.main-panel {
  width: min(100%, calc(var(--content-width) + 7rem));
  padding: 2rem 2rem 4rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.9fr);
  gap: 1.3rem;
  align-items: stretch;
}

.hero,
.section-block,
.article-card {
  position: relative;
  z-index: 1;
}

.hero > div,
.section-block,
.article-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.hero > div:first-child,
.section-block,
.article-card {
  padding: 1.7rem;
}

.hero-card {
  padding: 1.7rem;
  background:
    linear-gradient(180deg, rgba(255, 245, 229, 0.92), rgba(247, 236, 221, 0.88));
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0 0 0.7rem;
  font-family: var(--font-serif);
  line-height: 1.18;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4.1rem);
}

h2 {
  margin-top: 2.1rem;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
}

h3 {
  font-size: 1.18rem;
}

.hero-copy,
.article-lead {
  max-width: 62ch;
  color: #433a31;
  font-size: 1.05rem;
}

.ordered-list {
  margin: 0.8rem 0 0;
  padding-left: 1.15rem;
}

.section-block {
  margin-top: 1.3rem;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading span,
.meta-row,
.media-tip {
  color: var(--muted);
  font-size: 0.92rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.doc-card {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 253, 248, 0.74);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.doc-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: rgba(255, 253, 248, 0.96);
}

.doc-kicker {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1rem;
  margin-top: 1rem;
}

.code-panel {
  margin-top: 1rem;
}

.article-shell {
  min-height: 100vh;
}

.article-main {
  width: min(100%, calc(var(--content-width) + 1.5rem));
}

.article-card {
  padding: 2rem;
}

.article-header {
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.article-card p,
.article-card li,
.article-card td,
.article-card th {
  font-size: 1.02rem;
}

.article-card ul,
.article-card ol {
  padding-left: 1.2rem;
}

.callout {
  margin: 1.1rem 0;
  padding: 1rem 1rem 1rem 1.05rem;
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  background: rgba(143, 74, 36, 0.08);
}

.callout.warning {
  border-left-color: #b45c20;
  background: rgba(180, 92, 32, 0.1);
}

.callout.muted {
  border-left-color: rgba(67, 58, 49, 0.6);
  background: rgba(67, 58, 49, 0.07);
}

.callout strong {
  display: block;
  margin-bottom: 0.3rem;
}

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

.media-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 252, 247, 0.7);
}

.media-label {
  margin: 0 0 0.8rem;
  font-weight: 700;
}

.copy-button {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #f9f0df;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.16);
}

.side-section a.is-current {
  background: rgba(143, 74, 36, 0.14);
  border: 1px solid rgba(143, 74, 36, 0.16);
}

.is-hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .site-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: sticky;
    top: 0;
    z-index: 12;
    height: auto;
    padding: 0.95rem 1rem 0.85rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(248, 242, 232, 0.94);
    box-shadow: 0 10px 24px rgba(72, 52, 33, 0.08);
  }

  .brand {
    gap: 0.75rem;
  }

  .brand strong {
    font-size: 1rem;
  }

  .brand small {
    font-size: 0.88rem;
  }

  .brand-mark {
    width: 2.45rem;
    height: 2.45rem;
  }

  .search {
    gap: 0.45rem;
    margin: 0.9rem 0 0.8rem;
  }

  .search span {
    font-size: 0.88rem;
  }

  .main-panel {
    width: 100%;
    padding: 1rem 0.9rem 2.4rem;
  }

  .hero,
  .card-grid,
  .media-grid {
    grid-template-columns: 1fr;
  }

  nav.side-section {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.55rem;
    overflow-x: auto;
    margin-top: 0.95rem;
    padding-bottom: 0.2rem;
    scrollbar-width: none;
  }

  nav.side-section::-webkit-scrollbar {
    display: none;
  }

  nav.side-section p {
    flex: 0 0 auto;
    margin: 0.45rem 0.2rem 0 0;
    white-space: nowrap;
  }

  nav.side-section a {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    margin-bottom: 0;
    padding: 0.58rem 0.82rem;
    border: 1px solid rgba(98, 73, 45, 0.14);
    background: rgba(255, 251, 244, 0.88);
    white-space: nowrap;
  }

  .side-section {
    margin-top: 1rem;
  }

  .compact-list {
    margin: 0;
    font-size: 0.92rem;
  }

  .hero {
    gap: 0.9rem;
  }

  h1 {
    font-size: clamp(1.95rem, 8vw, 2.85rem);
  }

  h2 {
    margin-top: 1.7rem;
    font-size: clamp(1.45rem, 5vw, 1.85rem);
  }

  .hero-copy,
  .article-lead,
  .article-card p,
  .article-card li,
  .article-card td,
  .article-card th {
    font-size: 0.98rem;
  }

  .article-card {
    padding: 1.4rem;
  }

  .doc-card,
  .hero > div:first-child,
  .hero-card,
  .section-block {
    border-radius: 22px;
  }

  pre {
    margin: 1rem 0;
    padding: 1rem 0.9rem 2.7rem;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .copy-button {
    top: auto;
    right: 0.75rem;
    bottom: 0.7rem;
  }
}

@media (max-width: 640px) {
  .sidebar {
    padding: 0.8rem 0.8rem 0.75rem;
  }

  .hero > div:first-child,
  .hero-card,
  .section-block,
  .article-card {
    padding: 1.15rem;
  }

  .main-panel {
    padding: 0.85rem 0.75rem 2rem;
  }

  .section-heading {
    display: block;
  }

  .meta-row {
    gap: 0.4rem 0.8rem;
  }

  .side-section p {
    font-size: 0.84rem;
  }

  .side-section a {
    font-size: 0.93rem;
  }

  .compact-list {
    padding-left: 1rem;
  }

  pre code {
    font-size: 0.86rem;
  }
}