:root {
  --bg: #f6f0e6;
  --bg-accent: #e8f1f0;
  --ink: #1b1b1f;
  --muted: #5a5a62;
  --accent: #c95a1a;
  --accent-2: #1f6f78;
  --paper: #fffaf3;
  --code-bg: #1f1c18;
  --code-ink: #f7e7d1;
  --border: #d9cdbb;
  --shadow: 0 20px 40px rgba(32, 24, 16, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", "Verdana", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 15% 10%, #fff3da 0%, transparent 50%),
    radial-gradient(circle at 80% 0%, #e0f2f1 0%, transparent 45%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-accent) 100%);
  overflow-x: hidden;
}

main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

header {
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

header .wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 2rem 2rem;
}

h1 {
  font-size: clamp(2.2rem, 2.8vw, 3.4rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 2vw, 2.2rem);
  margin-top: 2.5rem;
  scroll-margin-top: 120px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.8rem;
  scroll-margin-top: 120px;
}

p {
  line-height: 1.6;
  color: var(--muted);
}

nav.primary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

nav.primary a {
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: #fff;
}

nav.primary a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toc {
  background: #fff;
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.toc a {
  color: var(--accent-2);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent);
}

.guide-index ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
}

.guide-index li.toc-sub {
  margin-left: 0.85rem;
  font-size: 0.95rem;
}

.guide-index li.toc-sub a {
  color: var(--muted);
}

.doc-title-link {
  color: inherit;
  text-decoration: none;
}

.doc-title-link:hover .doc-title-cursor {
  opacity: 1;
}

.doc-title-cursor {
  font-size: 0.85em;
  opacity: 0.65;
}

.section-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.8rem;
  margin-top: 1.75rem;
  box-shadow: var(--shadow);
}

code,
pre {
  font-family: "IBM Plex Mono", "Courier New", monospace;
}

pre {
  background: var(--code-bg);
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 1.25rem;
  border-radius: 14px;
  overflow: auto;
  border: 1px solid rgba(255, 255, 255, 0.08);
}


figure {
  margin: 0;
}

.code-title {
  font-weight: 600;
  margin: 0 0 0.6rem 0;
}

.code-block {
  margin: 0 0 1.5rem 0;
}

figcaption {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

a.inline-link {
  color: var(--accent-2);
}

.notice {
  border-left: 4px solid var(--accent);
  padding: 0.8rem 1rem;
  background: #fff2e1;
  color: var(--ink);
  border-radius: 10px;
}

footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  color: var(--muted);
}

footer a {
  color: var(--accent-2);
}

@media (min-width: 801px) {
  .guide-layout {
    display: grid;
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    gap: 2rem;
    align-items: start;
    width: 100%;
  }

  .guide-index {
    position: sticky;
    top: 1.5rem;
    max-height: calc(100vh - 3rem);
    overflow: auto;
    width: 100%;
    margin-top: 0;
  }

  .guide-content {
    min-width: 0;
    max-width: 900px;
  }

  .guide-content .section-card:first-child {
    margin-top: 0;
  }
}

@media (max-width: 800px) {
  main {
    padding: 2rem 1.2rem 3rem;
  }

  header .wrap {
    padding: 2rem 1.2rem 1.6rem;
  }

  nav.primary {
    flex-direction: column;
    align-items: flex-start;
  }
}