:root {
  --bg: #f6f4ef;
  --paper: #fffcf5;
  --ink: #16241f;
  --muted: #4f645d;
  --line: #d9d3c6;
  --accent: #0f766e;
  --accent-soft: #c7eee8;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "Atkinson Hyperlegible", "Gill Sans", "Trebuchet MS", sans-serif;
  --shadow: 0 12px 28px rgba(15, 118, 110, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 8% 4%, rgba(15, 118, 110, 0.12), transparent 30%),
    radial-gradient(circle at 92% 6%, rgba(180, 83, 9, 0.12), transparent 26%),
    repeating-linear-gradient(
      135deg,
      rgba(22, 36, 31, 0.015),
      rgba(22, 36, 31, 0.015) 2px,
      transparent 2px,
      transparent 9px
    ),
    var(--bg);
}

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 1.2rem;
}

.sidebar {
  position: sticky;
  top: 1rem;
  align-self: start;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.brand h1 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.2;
}

.eyebrow {
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.74rem;
}

.subtitle {
  margin: 0.5rem 0 1.1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.42rem 0.78rem;
  border-radius: 999px;
  border: 1px solid #97ddd3;
  background: linear-gradient(180deg, #dbf7f2 0%, #c7eee8 100%);
  color: #0c5952;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.86rem;
  transition: transform 140ms ease, box-shadow 140ms ease, filter 140ms ease;
}

.github-link:hover,
.github-link:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(15, 118, 110, 0.2);
  filter: saturate(1.05);
  outline: none;
}

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

.toc a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.94rem;
  padding: 0.38rem 0.55rem;
  border-radius: 9px;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.toc a:hover,
.toc a:focus-visible {
  background: var(--accent-soft);
  color: #0a534d;
  transform: translateX(2px);
  outline: none;
}

.content {
  display: grid;
  gap: 1rem;
}

.section {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.2rem;
  animation: rise-in 420ms ease both;
}

.content .section:nth-child(1) {
  animation-delay: 30ms;
}

.content .section:nth-child(2) {
  animation-delay: 80ms;
}

.content .section:nth-child(3) {
  animation-delay: 130ms;
}

.content .section:nth-child(4) {
  animation-delay: 180ms;
}

.content .section:nth-child(5) {
  animation-delay: 230ms;
}

.content .section:nth-child(6) {
  animation-delay: 280ms;
}

.content .section:nth-child(7) {
  animation-delay: 330ms;
}

.content .section:nth-child(8) {
  animation-delay: 380ms;
}

.content .section:nth-child(9) {
  animation-delay: 430ms;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  border-left: 6px solid var(--accent);
}

.badge {
  margin: 0;
  display: inline-block;
  background: var(--accent-soft);
  color: #085952;
  border: 1px solid #8cd9d0;
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
}

h2,
h3,
h4 {
  line-height: 1.25;
}

h2 {
  margin: 0.45rem 0 0.6rem;
  font-size: clamp(1.35rem, 2vw + 0.95rem, 2.05rem);
}

h3 {
  margin: 0.05rem 0 0.6rem;
  font-size: clamp(1.1rem, 1vw + 0.9rem, 1.45rem);
}

h4 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
}

p {
  margin: 0 0 0.75rem;
}

ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}

pre {
  margin: 0.7rem 0 0;
  overflow: auto;
  background: #17211e;
  color: #e9f2ef;
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
  border: 1px solid #2e3b37;
}

code {
  font-family: var(--mono);
  font-size: 0.88rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

th,
td {
  text-align: left;
  padding: 0.58rem 0.62rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: 0.95rem;
}

thead th {
  background: #f4f0e6;
  font-weight: 700;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.card-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fffdf8;
  padding: 0.8rem;
}

.api-grid .card ul {
  margin-top: 0;
}

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

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    max-height: none;
  }

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

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

@media (max-width: 720px) {
  .layout {
    padding: 1rem 0.75rem 2rem;
  }

  .sidebar,
  .section {
    border-radius: 13px;
  }

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

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

  th,
  td {
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}