:root {
  --bg: #f3efe3;
  --paper: rgba(255, 252, 244, 0.92);
  --paper-strong: #fffaf0;
  --ink: #1d2a33;
  --muted: #5d6770;
  --accent: #146356;
  --accent-strong: #0b453c;
  --line: rgba(29, 42, 51, 0.12);
  --glow: rgba(20, 99, 86, 0.16);
  --code-bg: #172127;
  --code-ink: #e9f0f2;
  --shadow: 0 20px 60px rgba(29, 42, 51, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(20, 99, 86, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(206, 114, 50, 0.12), transparent 24%),
    linear-gradient(180deg, #f7f2e6 0%, var(--bg) 58%, #ebe5d4 100%);
  font-family: Georgia, 'Times New Roman', serif;
}

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background-image: radial-gradient(var(--ink) 0.6px, transparent 0.6px);
  background-size: 10px 10px;
}

a {
  color: var(--accent-strong);
}

.hero {
  width: min(1200px, calc(100vw - 32px));
  margin: 24px auto 20px;
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 2.2fr) minmax(260px, 1fr);
}

.hero-copy,
.meta-card,
.toc,
.guide {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-copy {
  padding: 40px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font: 700 0.9rem/1.3 'Trebuchet MS', Verdana, sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.8rem, 4vw, 4.8rem);
  line-height: 0.96;
}

.lede {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.12rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--paper-strong);
  text-decoration: none;
  font: 700 0.95rem/1.2 'Trebuchet MS', Verdana, sans-serif;
}

.meta-card {
  padding: 24px;
  height: 100%;
}

.meta-card h2,
.toc h2 {
  margin: 0 0 14px;
  font-size: 1.05rem;
  font-family: 'Trebuchet MS', Verdana, sans-serif;
}

.meta-card p {
  margin: 10px 0;
  line-height: 1.6;
}

.layout {
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto 32px;
  display: grid;
  gap: 20px;
  grid-template-columns: 280px minmax(0, 1fr);
}

.toc {
  position: sticky;
  top: 20px;
  align-self: start;
  padding: 22px;
}

.toc a {
  display: block;
  padding: 8px 0;
  text-decoration: none;
  color: var(--muted);
  line-height: 1.4;
}

.toc .toc-level-1,
.toc .toc-level-2 {
  color: var(--ink);
}

.toc .toc-level-3 {
  padding-left: 14px;
}

.guide {
  padding: 34px;
}

.guide h1,
.guide h2,
.guide h3 {
  scroll-margin-top: 24px;
}

.guide h1 {
  font-size: 2.2rem;
}

.guide h2 {
  margin-top: 34px;
  padding-top: 8px;
  font-size: 1.5rem;
  border-top: 1px solid var(--line);
}

.guide h3 {
  margin-top: 24px;
  font-size: 1.12rem;
}

.guide p,
.guide li,
.guide .step {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.8;
}

.guide ul {
  padding-left: 22px;
}

.guide code {
  padding: 0.12rem 0.36rem;
  border-radius: 6px;
  background: rgba(20, 99, 86, 0.08);
  font-family: 'Courier New', monospace;
  font-size: 0.92em;
}

.guide pre {
  margin: 18px 0;
  overflow-x: auto;
  padding: 18px;
  border-radius: 18px;
  background: var(--code-bg);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04), 0 12px 30px rgba(0, 0, 0, 0.18);
}

.guide pre code {
  padding: 0;
  background: transparent;
  color: var(--code-ink);
  font-size: 0.92rem;
  line-height: 1.6;
}

.step span {
  font-weight: 700;
  color: var(--accent-strong);
}

@media (max-width: 980px) {
  .hero,
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 640px) {
  .hero-copy,
  .guide,
  .meta-card,
  .toc {
    padding: 22px;
    border-radius: 20px;
  }

  .hero {
    margin-top: 16px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }
}