:root {
  --um-bg:        hsl(220, 53%, 97%);
  --um-fg:        hsl(240, 28%, 14%);
  --um-card:      hsl(0, 0%, 100%);
  --um-primary:   hsl(212, 67%, 33%);
  --um-secondary: hsl(196, 58%, 42%);
  --um-muted:     hsl(220, 30%, 93%);
  --um-muted-fg:  hsl(210, 7%, 46%);
  --um-accent:    hsl(38, 91%, 55%);
  --um-success:   hsl(145, 63%, 42%);
  --um-warning:   hsl(36, 90%, 51%);
  --um-danger:    hsl(6, 78%, 57%);
  --um-border:    hsl(220, 20%, 88%);
  --um-radius:    10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--um-bg);
  color: var(--um-fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.65;
}

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

/* ── Top bar ─────────────────────────────────────────────── */
.um-topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 24px; background: var(--um-primary); color: #fff;
  position: sticky; top: 0; z-index: 20; box-shadow: 0 1px 3px rgba(0,0,0,.15);
}
.um-topbar a { color: #fff; }
.um-topbar a:hover { text-decoration: none; opacity: .85; }
.um-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; letter-spacing: .01em; }
.um-brand svg { width: 20px; height: 20px; flex-shrink: 0; }
.um-crumbs { font-size: 13px; opacity: .9; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.um-crumbs .sep { opacity: .6; }

/* ── Shell: sidebar + content ────────────────────────────── */
.um-shell { display: flex; max-width: 1280px; margin: 0 auto; align-items: flex-start; }
.um-sidebar {
  width: 260px; flex-shrink: 0; padding: 24px 16px; position: sticky; top: 57px;
  max-height: calc(100vh - 57px); overflow-y: auto;
}
.um-sidebar h4 {
  font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--um-muted-fg);
  margin: 20px 8px 8px; font-weight: 700;
}
.um-sidebar h4:first-child { margin-top: 0; }
.um-nav-link {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 6px;
  font-size: 13.5px; font-weight: 500; color: var(--um-fg); margin-bottom: 2px;
}
.um-nav-link:hover { background: var(--um-muted); text-decoration: none; }
.um-nav-link.active { background: hsl(212 67% 33% / .1); color: var(--um-primary); font-weight: 700; }
.um-nav-link svg { width: 15px; height: 15px; flex-shrink: 0; opacity: .75; }

.um-content { flex: 1; min-width: 0; padding: 32px 32px 80px; }
.um-content > h1:first-child { margin-top: 0; }

/* ── Typography ──────────────────────────────────────────── */
.um-content h1 { font-size: 28px; font-weight: 800; margin: 0 0 6px; letter-spacing: -.01em; }
.um-content .um-subtitle { color: var(--um-muted-fg); font-size: 14.5px; margin: 0 0 28px; }
.um-content h2 {
  font-size: 19px; font-weight: 700; margin: 40px 0 12px; padding-top: 8px;
  border-top: 1px solid var(--um-border); scroll-margin-top: 72px;
}
.um-content h2:first-of-type { border-top: none; padding-top: 0; margin-top: 8px; }
.um-content h3 { font-size: 15.5px; font-weight: 700; margin: 22px 0 8px; scroll-margin-top: 72px; }
.um-content p { margin: 0 0 12px; }
.um-content ul, .um-content ol { margin: 0 0 14px; padding-left: 22px; }
.um-content li { margin-bottom: 5px; }
.um-content li > ul, .um-content li > ol { margin-top: 5px; }
.um-content strong { font-weight: 700; }
.um-content code {
  background: var(--um-muted); border-radius: 4px; padding: 1px 6px; font-size: 12.5px;
  font-family: 'SFMono-Regular', Consolas, Menlo, monospace; color: var(--um-primary);
}

/* ── Callouts ────────────────────────────────────────────── */
.um-callout {
  display: flex; gap: 10px; padding: 12px 14px; border-radius: 8px; margin: 16px 0;
  font-size: 13.5px; border: 1px solid transparent;
}
.um-callout svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }
.um-callout p { margin: 0; }
.um-callout.tip   { background: hsl(212 67% 33% / .07); border-color: hsl(212 67% 33% / .2); color: var(--um-primary); }
.um-callout.warn  { background: hsl(36 90% 51% / .1);   border-color: hsl(36 90% 51% / .3);  color: hsl(30 80% 32%); }
.um-callout.note  { background: var(--um-muted); border-color: var(--um-border); color: var(--um-fg); }

/* ── Step list ───────────────────────────────────────────── */
.um-steps { list-style: none; margin: 0 0 16px; padding: 0; counter-reset: um-step; }
.um-steps > li {
  counter-increment: um-step; position: relative; padding: 2px 0 2px 34px; margin-bottom: 12px;
}
.um-steps > li::before {
  content: counter(um-step); position: absolute; left: 0; top: 0;
  width: 24px; height: 24px; border-radius: 50%; background: var(--um-primary); color: #fff;
  font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}

/* ── Cards / field tables ────────────────────────────────── */
.um-card { background: var(--um-card); border: 1px solid var(--um-border); border-radius: var(--um-radius); padding: 18px 20px; margin: 16px 0; }
.um-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.um-field-table { width: 100%; border-collapse: collapse; font-size: 13px; margin: 12px 0 20px; }
.um-field-table th, .um-field-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--um-border); vertical-align: top; }
.um-field-table th { font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--um-muted-fg); font-weight: 700; background: var(--um-muted); }
.um-field-table td:first-child { font-weight: 600; white-space: nowrap; }
.um-badge {
  display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 700;
  background: var(--um-muted); color: var(--um-muted-fg);
}
.um-badge.req { background: hsl(6 78% 57% / .1); color: var(--um-danger); }

/* ── Landing / index cards ───────────────────────────────── */
.um-hero { text-align: center; padding: 56px 24px 24px; max-width: 720px; margin: 0 auto; }
.um-hero h1 { font-size: 32px; }
.um-tile-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; max-width: 1000px; margin: 32px auto 0; padding: 0 24px 60px; }
.um-tile {
  display: block; background: var(--um-card); border: 1px solid var(--um-border); border-radius: var(--um-radius);
  padding: 20px; transition: box-shadow .15s, transform .15s;
}
.um-tile:hover { box-shadow: 0 6px 20px rgba(20,30,60,.08); transform: translateY(-2px); text-decoration: none; }
.um-tile .um-tile-icon {
  width: 40px; height: 40px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  background: hsl(212 67% 33% / .1); color: var(--um-primary); margin-bottom: 12px;
}
.um-tile .um-tile-icon svg { width: 20px; height: 20px; }
.um-tile h3 { margin: 0 0 4px; font-size: 15px; color: var(--um-fg); }
.um-tile p { margin: 0; font-size: 12.5px; color: var(--um-muted-fg); }
.um-tile.disabled { opacity: .55; cursor: default; }
.um-tile.disabled:hover { box-shadow: none; transform: none; }

/* ── Mobile ──────────────────────────────────────────────── */
.um-menu-toggle { display: none; background: none; border: 1px solid rgba(255,255,255,.4); color: #fff; border-radius: 6px; padding: 6px 10px; font-size: 12px; cursor: pointer; }
@media (max-width: 900px) {
  .um-shell { flex-direction: column; }
  .um-sidebar { position: static; width: 100%; max-height: none; border-bottom: 1px solid var(--um-border); display: none; }
  .um-sidebar.open { display: block; }
  .um-menu-toggle { display: inline-block; }
  .um-content { padding: 24px 18px 60px; }
  .um-grid-2 { grid-template-columns: 1fr; }
}