/* Public pages (landing + legal), 2026-09-22.
   Same brand tokens as os.css — square, monochrome, Nunito Sans — but self-contained so the
   signed-in shell's layout rules (fixed top bar, sidebar) never leak onto public pages. */
:root {
  --bg: #ffffff;
  --panel: #f6f6f4;
  --ink: #0a0a0a;
  --ink-2: #2b2b2b;
  --muted: #6d6d6a;
  --line: #e6e6e2;
  --font: "Nunito Sans", -apple-system, system-ui, "Segoe UI", Arial, sans-serif;
  --wrap: 72rem;
  --narrow: 46rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body.pub {
  margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg);
  font-size: 16px; line-height: 1.6;
}
a { color: inherit; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.pub-wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 700px) { .pub-wrap { padding: 0 32px; } }
.pub-narrow { max-width: var(--narrow); }
.pub-muted { color: var(--muted); }

/* Top bar */
.pub-top { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 10; }
.pub-top-inner { display: flex; align-items: center; justify-content: space-between; min-height: 3.5rem; gap: 16px; }
.pub-wordmark { text-decoration: none; letter-spacing: .18em; font-size: .95rem; display: inline-flex; gap: .45em; align-items: baseline; }
.pub-wordmark b { font-weight: 900; }
.pub-wordmark span { font-weight: 600; color: var(--muted); }
.pub-wordmark-sm { font-size: .85rem; }
.pub-top-nav { display: flex; align-items: center; gap: 20px; font-size: .9rem; }
.pub-top-nav a:not(.pub-btn) { text-decoration: none; color: var(--ink-2); }
.pub-top-nav a:not(.pub-btn):hover { text-decoration: underline; }
@media (max-width: 480px) { .pub-top-nav a:not(.pub-btn) { display: none; } }

/* Buttons */
.pub-btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  padding: 0 22px; background: var(--ink); color: #fff; border: 1px solid var(--ink);
  text-decoration: none; font-weight: 700; font-size: .85rem; letter-spacing: .08em;
  text-transform: uppercase; transition: background .2s var(--ease), color .2s var(--ease);
  max-width: 100%; text-align: center; overflow-wrap: anywhere;
}
.pub-btn:hover { background: var(--ink-2); }
.pub-btn-ghost { background: transparent; color: var(--ink); }
.pub-btn-ghost:hover { background: var(--ink); color: #fff; }
.pub-btn-sm { min-height: 36px; padding: 0 16px; font-size: .75rem; }

/* Type */
.pub-eyebrow { margin: 0 0 12px; font-size: .75rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.pub-eyebrow a { text-decoration: none; }
.pub-h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.08; font-weight: 800; letter-spacing: -.025em; max-width: 22ch; }
.pub-h1-sm { font-size: clamp(1.8rem, 4vw, 2.5rem); max-width: none; }
.pub-h2 { margin: 0 0 24px; font-size: clamp(1.4rem, 3vw, 1.9rem); line-height: 1.2; font-weight: 800; letter-spacing: -.015em; }
.pub-lede { margin: 20px 0 0; font-size: 1.15rem; color: var(--ink-2); max-width: 40rem; }
.pub-note { margin: 18px 0 0; font-size: .85rem; color: var(--muted); }
.pub-meta { margin: 12px 0 0; font-size: .85rem; color: var(--muted); }

/* Sections */
.pub-hero { padding: 88px 0 80px; border-bottom: 1px solid var(--line); }
.pub-section { padding: 72px 0; }
.pub-section + .pub-section { border-top: 1px solid var(--line); }
.pub-section-panel { background: var(--panel); }
.pub-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
@media (max-width: 700px) { .pub-hero { padding: 56px 0; } .pub-section { padding: 52px 0; } }

.pub-grid { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); grid-template-columns: repeat(4, 1fr); }
.pub-grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .pub-grid { grid-template-columns: repeat(2, 1fr); } .pub-grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .pub-grid { grid-template-columns: 1fr; } }
.pub-card, .pub-point { background: var(--bg); padding: 28px 24px; }
.pub-card h3, .pub-point h3 { margin: 0 0 8px; font-size: 1rem; font-weight: 800; }
.pub-card p, .pub-point p { margin: 0; color: var(--ink-2); font-size: .95rem; }
.pub-card-flat { border: 1px solid var(--line); }

.pub-split { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.pub-split p { color: var(--ink-2); max-width: 38rem; }
@media (max-width: 860px) { .pub-split { grid-template-columns: 1fr; gap: 32px; } }
.pub-doclist { list-style: none; margin: 12px 0 0; padding: 0; }
.pub-doclist li { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); font-size: .95rem; }
.pub-doclist li:first-child { border-top: 0; }
.pub-doclist .pub-muted { font-size: .8rem; white-space: nowrap; }

/* Legal */
.pub-legal-list { list-style: none; margin: 40px 0; padding: 0; border-top: 1px solid var(--line); }
.pub-legal-list li { padding: 18px 0; border-bottom: 1px solid var(--line); display: flex; flex-direction: column; gap: 2px; }
.pub-legal-list a { font-weight: 700; font-size: 1.05rem; }
.pub-legal-list .pub-muted { font-size: .85rem; }
.pub-legal { margin-top: 40px; padding-top: 32px; border-top: 1px solid var(--line); overflow-wrap: break-word; }
.pub-legal h2 { font-size: 1.15rem; font-weight: 800; margin: 40px 0 12px; scroll-margin-top: 5rem; }
.pub-legal h3 { font-size: 1rem; font-weight: 800; margin: 32px 0 10px; scroll-margin-top: 5rem; }
.pub-legal h2:first-child { margin-top: 0; }
.pub-legal .pub-legal-center { text-transform: uppercase; letter-spacing: .12em; font-size: .9rem; }
.pub-legal p, .pub-legal li { color: var(--ink-2); }
.pub-legal ul, .pub-legal ol { padding-left: 1.4rem; }
.pub-legal li { margin: 6px 0; }
.pub-legal ol.pub-alpha { list-style: lower-alpha; }
.pub-legal-end { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); }

/* Footer */
.pub-foot { border-top: 1px solid var(--line); padding: 56px 0 28px; font-size: .9rem; }
.pub-foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { .pub-foot-grid { grid-template-columns: 1fr; } }
.pub-foot-h { margin: 0 0 10px; font-size: .72rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.pub-foot-list { list-style: none; margin: 0; padding: 0; }
.pub-foot-list li { margin: 6px 0; }
.pub-foot-list a { text-decoration: none; }
.pub-foot-list a:hover { text-decoration: underline; }
.pub-foot .pub-muted { margin: 12px 0 0; font-size: .85rem; line-height: 1.6; }
.pub-foot-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }