/* Atlas — mini-site styles. Zero-build; renders the repo's markdown client-side. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-sidebar: #fbfbfc;
  --fg: #1c2024;
  --fg-soft: #5b6470;
  --border: #e4e7eb;
  --accent: #2d5bff;
  --accent-soft: #eaefff;
  --code-bg: #f4f5f7;
  --code-fg: #20242a;
  --max-content: 780px;
  --sidebar-w: 268px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #161922;
    --bg-sidebar: #12141a;
    --fg: #e6e9ef;
    --fg-soft: #9aa3b2;
    --border: #262b36;
    --accent: #7aa2ff;
    --accent-soft: #1b2235;
    --code-bg: #171b23;
    --code-fg: #d7dce6;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: var(--sans);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 1.5rem 1rem 2rem;
}

.brand { display: flex; align-items: baseline; gap: .5rem; padding: 0 .5rem; margin-bottom: .25rem; }
.brand .logo { font-weight: 800; font-size: 1.35rem; letter-spacing: -.02em; }
.brand .logo a { color: var(--fg); }
.brand .ver { font-size: .7rem; color: var(--fg-soft); font-family: var(--mono); }
.tagline { padding: 0 .5rem; color: var(--fg-soft); font-size: .82rem; margin: 0 0 1.25rem; }

.nav-group-label {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--fg-soft); padding: 1rem .5rem .25rem; font-weight: 600;
}
nav a.nav-link {
  display: block; padding: .35rem .5rem; border-radius: 6px;
  color: var(--fg-soft); font-size: .9rem; line-height: 1.35;
}
nav a.nav-link:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
nav a.nav-link.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
nav a.nav-link .num { font-family: var(--mono); font-size: .78rem; opacity: .7; margin-right: .4rem; }

/* Content */
.main { flex: 1 1 auto; min-width: 0; display: flex; justify-content: center; }
.content { width: 100%; max-width: var(--max-content); padding: 2.5rem 2rem 5rem; }

.content h1, .content h2, .content h3, .content h4 { line-height: 1.25; letter-spacing: -.015em; }
.content h1 { font-size: 2rem; margin: 0 0 1rem; }
.content h2 { font-size: 1.4rem; margin: 2.25rem 0 .85rem; padding-top: .4rem; border-top: 1px solid var(--border); }
.content h2:first-of-type { border-top: none; padding-top: 0; }
.content h3 { font-size: 1.1rem; margin: 1.6rem 0 .6rem; }
.content p, .content li { font-size: .95rem; }

.content code {
  font-family: var(--mono); font-size: .86em;
  background: var(--code-bg); color: var(--code-fg);
  padding: .12em .38em; border-radius: 5px;
}
.content pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 10px; padding: 1rem 1.1rem; overflow-x: auto; line-height: 1.5;
}
.content pre code { background: none; padding: 0; font-size: .84rem; }

.content blockquote {
  margin: 1.1rem 0; padding: .6rem 1.1rem; border-left: 3px solid var(--accent);
  background: var(--bg-soft); border-radius: 0 8px 8px 0; color: var(--fg);
}
.content blockquote p { margin: .4rem 0; }

.content table {
  border-collapse: collapse; width: 100%; margin: 1.1rem 0; font-size: .88rem; display: block; overflow-x: auto;
}
.content th, .content td { border: 1px solid var(--border); padding: .5rem .7rem; text-align: left; vertical-align: top; }
.content th { background: var(--bg-soft); font-weight: 600; }

.content hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

.content ul, .content ol { padding-left: 1.4rem; }
.content li { margin: .25rem 0; }

.doc-footer {
  margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 1rem; font-size: .85rem; color: var(--fg-soft);
}
.doc-footer a { font-weight: 500; }

/* Mobile */
.menu-toggle {
  display: none; position: fixed; top: .75rem; left: .75rem; z-index: 30;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  width: 40px; height: 40px; font-size: 1.2rem; cursor: pointer; color: var(--fg);
}
.backdrop { display: none; }

@media (max-width: 820px) {
  .menu-toggle { display: block; }
  .sidebar {
    position: fixed; left: 0; top: 0; z-index: 25; transform: translateX(-100%);
    transition: transform .2s ease; box-shadow: 0 0 40px rgba(0,0,0,.15);
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .backdrop { display: block; position: fixed; inset: 0; z-index: 20; background: rgba(0,0,0,.35); }
  .content { padding: 3.5rem 1.25rem 4rem; }
}

#error { color: #c0392b; font-family: var(--mono); font-size: .85rem; }