/* ============================================================
   Help Center — design tokens
   Palette: pale sage paper + pine ink + mustard tab accent + teal link
   Type: Fraunces (display) / Inter (body) / IBM Plex Mono (meta, code)
   Signature: index-tab sidebar with a sliding rust marker,
              and "stamped" article meta line (mono, letter-spaced).
   ============================================================ */

:root {
  --paper: #eef1ec;
  --paper-raised: #f7f8f5;
  --ink: #1f2a24;
  --ink-soft: #52604f;
  --line: #d6d9cd;
  --line-strong: #b9bfae;
  --accent: #b8863b;      /* mustard tab / active marker */
  --accent-soft: #e9dcc0;
  --link: #2e6e62;        /* forest teal */
  --link-hover: #1f4d44;
  --code-bg: #26312a;
  --code-ink: #eef1ec;
  --danger: #a4462f;

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --sidebar-w: 280px;
  --header-h: 64px;
  --radius: 3px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration-color: var(--line-strong); }
a:hover { color: var(--link-hover); }
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Layout shell ---------- */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ---------- Top bar (mobile) ---------- */

.topbar {
  display: none;
  align-items: center;
  gap: 12px;
  height: var(--header-h);
  padding: 0 16px;
  background: var(--paper-raised);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  grid-column: 1 / -1;
}

.topbar-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
}

.menu-btn {
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink);
}
.menu-btn:hover { background: var(--accent-soft); }

/* ---------- Sidebar ---------- */

.sidebar {
  background: var(--paper-raised);
  border-right: 1px solid var(--line);
  padding: 28px 0 40px;
  height: 100vh;
  position: sticky;
  top: 0;
  overflow-y: auto;
}

.brand {
  padding: 0 24px 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}

.brand-tagline {
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin-top: 4px;
}

.search-wrap {
  padding: 0 20px 18px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
}

.search-box svg { flex-shrink: 0; color: var(--ink-soft); }

.search-box input {
  border: none;
  background: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink);
  width: 100%;
}

.search-kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 1px 5px;
  flex-shrink: 0;
}

nav.toc { padding: 0 12px; }

.category {
  margin-bottom: 6px;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  background: none;
  border: none;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  cursor: pointer;
  border-radius: var(--radius);
  text-align: left;
}
.category-title:hover { background: var(--accent-soft); color: var(--ink); }

.category-title .chevron {
  margin-left: auto;
  transition: transform 0.15s ease;
  flex-shrink: 0;
}
.category.collapsed .chevron { transform: rotate(-90deg); }
.category.collapsed .article-list { display: none; }

.article-list {
  list-style: none;
  margin: 2px 0 10px;
  padding: 0;
  position: relative;
}

/* sliding tab marker */
.article-list {
  border-left: 2px solid var(--line);
  margin-left: 12px;
}

.article-list li a {
  display: block;
  padding: 7px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.89rem;
  line-height: 1.4;
}

.article-list li a:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.article-list li a.active {
  color: var(--ink);
  font-weight: 600;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
}

mark {
  background: var(--accent-soft);
  color: var(--ink);
  padding: 0 1px;
  border-radius: 2px;
}

/* Base state: out of the grid flow entirely on desktop.
   Without this, the element had no styles outside the mobile
   media query, defaulted to a plain block div, and got auto-placed
   into a grid cell — pushing main content into the wrong column. */
.scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 25;
}

/* ---------- Main content ---------- */

main.content {
  padding: 56px 64px 100px;
  max-width: 780px;
}

.crumbs {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.crumbs .sep { margin: 0 6px; opacity: 0.5; }

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin: 14px 0 32px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.stamp {
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 2px 7px;
  color: var(--accent);
  transform: rotate(-1deg);
}

article.body h1 {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 0.3em;
}

article.body h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.8em 0 0.6em;
  padding-top: 0.2em;
}

article.body h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.6em 0 0.5em;
}

article.body p { margin: 0.9em 0; color: var(--ink); }

article.body ul, article.body ol {
  margin: 0.9em 0;
  padding-left: 1.4em;
}
article.body li { margin: 0.35em 0; }

article.body blockquote {
  margin: 1.2em 0;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--ink);
  border-radius: 0 var(--radius) var(--radius) 0;
}
article.body blockquote p { margin: 0.5em 0; }

article.body code {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--accent-soft);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

article.body pre {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 18px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.2em 0;
}
article.body pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.85em;
  line-height: 1.6;
}

article.body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2em 0;
  font-size: 0.92rem;
}
article.body th, article.body td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
}
article.body th {
  background: var(--paper-raised);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}

article.body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2em 0;
}

article.body a { text-underline-offset: 3px; }

.next-prev {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.next-prev a {
  flex: 1;
  text-decoration: none;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--paper-raised);
}
.next-prev a:hover { border-color: var(--accent); }
.next-prev .label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 4px;
}
.next-prev .to-prev { text-align: left; }
.next-prev .to-next { text-align: right; margin-left: auto; }

/* ---------- Home / index view ---------- */

.home-hero {
  margin-bottom: 40px;
}
.home-hero h1 {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 10px;
}
.home-hero p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin: 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.category-card {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  transition: border-color 0.12s ease, transform 0.12s ease;
}
.category-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.category-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 6px;
}
.category-card p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}
.category-card .count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  display: block;
  margin-top: 10px;
}

/* ---------- Search results view ---------- */

.search-results-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.search-results-list li {
  border-bottom: 1px solid var(--line);
}
.search-results-list a {
  display: block;
  padding: 16px 4px;
  text-decoration: none;
  color: var(--ink);
}
.search-results-list h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 4px;
}
.search-results-list .snippet {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}
.search-results-list .crumb {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-top: 6px;
  display: block;
}

.empty-state {
  color: var(--ink-soft);
  padding: 40px 0;
}

/* ---------- Not found ---------- */

.not-found h1 { font-family: var(--font-display); }

/* ---------- Scrollbar (webkit, subtle) ---------- */

.sidebar::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 4px;
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .app {
    grid-template-columns: 1fr;
  }
  .topbar { display: flex; }
  .sidebar {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    width: min(84vw, 320px);
    height: calc(100vh - var(--header-h));
    box-shadow: 2px 0 16px rgba(0,0,0,0.12);
  }
  .sidebar.open { transform: translateX(0); }
  .scrim {
    display: none;
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: rgba(0,0,0,0.25);
    z-index: 25;
  }
  .scrim.open { display: block; }
  main.content {
    padding: 32px 20px 80px;
    max-width: 100%;
  }
  .category-grid { grid-template-columns: 1fr; }
  article.body h1 { font-size: 1.9rem; }
}

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