:root {
  --bg: #120f14;
  --bg-alt: #1a141d;
  --panel: rgba(30, 22, 34, 0.86);
  --panel-strong: #221927;
  --panel-soft: rgba(255, 240, 214, 0.06);
  --line: rgba(255, 238, 214, 0.12);
  --line-strong: rgba(255, 184, 108, 0.3);
  --text: #f6efe3;
  --muted: #c4b7a7;
  --accent: #ffb04d;
  --accent-strong: #ff7d4d;
  --accent-cool: #65ddd4;
  --accent-lime: #d6ff6a;
  --shadow: 0 26px 80px rgba(0, 0, 0, 0.28);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --sidebar-width: 18rem;
  --max-width: 1400px;
  --font-body: "Microsoft YaHei UI", "Segoe UI Variable Text", sans-serif;
  --font-display: "Bahnschrift", "Segoe UI Variable Display", sans-serif;
  --font-code: "Cascadia Code", "JetBrains Mono", "Consolas", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at top left, rgba(255, 125, 77, 0.18), transparent 26%),
    radial-gradient(circle at 85% 8%, rgba(101, 221, 212, 0.12), transparent 18%),
    linear-gradient(180deg, #0d0a10 0%, #120f14 46%, #17131a 100%);
}

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

button {
  font: inherit;
}

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

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

.topbar {
  align-items: center;
  backdrop-filter: blur(20px);
  background: rgba(12, 10, 14, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  padding: 1rem clamp(1rem, 2vw, 2rem);
  position: sticky;
  top: 0;
  z-index: 30;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 1rem;
  min-width: 0;
}

.brand-mark {
  align-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-lime));
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
  color: #28170d;
  display: inline-flex;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  height: 3rem;
  justify-content: center;
  letter-spacing: 0.08em;
  width: 3rem;
}

.brand-copy {
  display: grid;
  gap: 0.2rem;
}

.brand-copy strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.92rem;
}

.topbar-actions {
  align-items: center;
  display: flex;
  gap: 0.8rem;
}

.ghost-link,
.nav-toggle,
.copy-button,
.detail-toggle {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  padding: 0.72rem 1rem;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.ghost-link:hover,
.nav-toggle:hover,
.copy-button:hover,
.detail-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
}

.layout {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, var(--sidebar-width)) minmax(0, 1fr);
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 1.5rem;
}

.sidebar {
  align-self: start;
  display: grid;
  gap: 1rem;
  position: sticky;
  top: 5.6rem;
}

.sidebar-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.1rem;
}

.sidebar-label,
.eyebrow {
  color: var(--accent-cool);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  margin: 0 0 0.7rem;
  text-transform: uppercase;
}

.toc {
  display: grid;
  gap: 0.35rem;
}

.toc a {
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--muted);
  padding: 0.72rem 0.8rem;
  transition:
    color 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.toc a:hover,
.toc a.is-active {
  background: rgba(255, 176, 77, 0.08);
  border-color: rgba(255, 176, 77, 0.2);
  color: var(--text);
}

.sidebar-note p,
.sidebar-note a {
  color: var(--muted);
  line-height: 1.6;
  margin: 0.5rem 0 0;
}

.sidebar-note a {
  color: var(--accent);
}

.content {
  display: grid;
  gap: 1.5rem;
}

.section {
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.03), transparent 55%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: clamp(1.25rem, 2vw, 2rem);
  position: relative;
}

.section::before {
  background: linear-gradient(90deg, transparent, rgba(255, 176, 77, 0.14), transparent);
  content: "";
  height: 1px;
  left: 1.5rem;
  position: absolute;
  right: 1.5rem;
  top: 0;
}

.hero-panel {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1.3fr) minmax(20rem, 0.95fr);
}

.hero-copy h1,
.section-heading h2,
.info-card h3,
.hero-card h2 {
  font-family: var(--font-display);
  line-height: 1.1;
  margin: 0;
}

.hero-copy h1 {
  font-size: clamp(2.2rem, 4.4vw, 4rem);
  margin-bottom: 1rem;
  max-width: 14ch;
}

.lead,
.summary,
.info-card p,
.sidebar-card p,
.number-list,
.check-list {
  line-height: 1.72;
}

.lead {
  color: var(--text);
  font-size: 1.06rem;
  margin: 0 0 1rem;
}

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

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.pill-row span {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  color: var(--text);
  padding: 0.55rem 0.85rem;
}

.hero-card,
.info-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02)),
    var(--panel-soft);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
}

.hero-card {
  align-self: start;
}

.card-head,
.section-heading {
  align-items: start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.card-head {
  margin-bottom: 1rem;
}

.section-heading {
  margin-bottom: 1.25rem;
}

.section-heading h2 {
  font-size: clamp(1.7rem, 2.7vw, 2.4rem);
}

.code-block {
  background: #0d1016;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  color: #d9f6f3;
  font-size: 0.93rem;
  line-height: 1.65;
  margin: 0;
  overflow-x: auto;
  padding: 1rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.check-list,
.info-card ul,
.number-list {
  margin: 0.9rem 0 0;
  padding-left: 1.2rem;
}

.check-list li,
.info-card li,
.number-list li {
  margin: 0.42rem 0;
}

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

.card-grid {
  display: grid;
  gap: 1rem;
}

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

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

.wide-card + .wide-card,
.wide-card + .card-grid,
.card-grid + .wide-card,
.wide-card + .split-grid {
  margin-top: 1rem;
}

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

.split-grid h4 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  margin: 0 0 0.7rem;
}

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

table {
  border-collapse: collapse;
  min-width: 100%;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.9rem 0.95rem;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--accent-cool);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

td {
  color: var(--text);
  line-height: 1.6;
}

.release-log {
  display: grid;
  gap: 0.75rem;
}

.release-log details {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 0.95rem 1rem;
}

.release-log summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.02rem;
  list-style: none;
}

.release-log summary::-webkit-details-marker {
  display: none;
}

.release-log summary::after {
  color: var(--accent);
  content: "＋";
  float: right;
  font-size: 1rem;
}

.release-log details[open] summary::after {
  content: "－";
}

.release-log ul {
  margin: 0.9rem 0 0;
  padding-left: 1.2rem;
}

.code-split .code-block {
  height: 100%;
}

@media (max-width: 1120px) {
  .hero-panel,
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .sidebar {
    display: none;
  }

  body.nav-open {
    overflow: hidden;
  }

  body.nav-open .sidebar {
    background: rgba(10, 8, 12, 0.74);
    display: grid;
    inset: 4.8rem 1rem 1rem;
    overflow: auto;
    padding: 0;
    position: fixed;
    z-index: 40;
  }

  body.nav-open .sidebar-card {
    backdrop-filter: blur(16px);
  }

  .two-up,
  .three-up,
  .split-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: start;
    flex-direction: column;
    gap: 1rem;
  }

  .topbar-actions {
    width: 100%;
  }

  .ghost-link,
  .nav-toggle {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 560px) {
  .layout {
    padding: 1rem;
  }

  .section {
    border-radius: 24px;
    padding: 1rem;
  }

  .brand {
    align-items: start;
  }

  .brand-copy strong {
    font-size: 0.98rem;
  }

  .brand-copy span {
    font-size: 0.84rem;
  }

  .copy-button,
  .detail-toggle {
    padding-inline: 0.9rem;
  }
}