/* AI-First PM — editorial design system
   Warm paper + ink, single terracotta accent. Light/dark aware.
   Zero web fonts: fast, reliable, good for SEO. */

:root {
  --paper:      #FBF7F0;
  --paper-2:    #F4EDE1;
  --card:       #FFFFFF;
  --ink:        #1A1714;
  --ink-soft:   #57514A;
  --ink-faint:  #8A8178;
  --accent:     #C0492B;
  --accent-ink: #97371F;
  --line:       #E6DDCE;
  --line-2:     #D8CDB9;
  --shadow:     0 1px 2px rgba(26,23,20,.04), 0 8px 30px rgba(26,23,20,.06);
  --maxw:       1080px;
  --readw:      68ch;
  --serif:      ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans:       system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono:       ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:    #15120E;
    --paper-2:  #1D1913;
    --card:     #201B15;
    --ink:      #F2ECE2;
    --ink-soft: #B7AE9F;
    --ink-faint:#847B6D;
    --accent:   #E4765A;
    --accent-ink:#EF8B71;
    --line:     #2C261E;
    --line-2:   #3A3227;
    --shadow:   0 1px 2px rgba(0,0,0,.3), 0 10px 34px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"] {
  --paper:#15120E; --paper-2:#1D1913; --card:#201B15;
  --ink:#F2ECE2; --ink-soft:#B7AE9F; --ink-faint:#847B6D;
  --accent:#E4765A; --accent-ink:#EF8B71; --line:#2C261E; --line-2:#3A3227;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 10px 34px rgba(0,0,0,.35);
}

*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.skip { position:absolute; left:-9999px; top:0; }
.skip:focus { left:12px; top:12px; background:var(--ink); color:var(--paper); padding:8px 14px; border-radius:8px; z-index:100; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display:flex; align-items:center; gap:22px; height:64px; }
.brand { display:flex; align-items:baseline; gap:9px; font-family:var(--serif); font-weight:700; font-size:20px; color:var(--ink); letter-spacing:-.01em; }
.brand:hover { text-decoration:none; }
.brand .dot { width:9px; height:9px; border-radius:50%; background:var(--accent); display:inline-block; transform:translateY(-1px); }
.nav-links { display:flex; gap:20px; margin-left:auto; align-items:center; }
.nav-links a { color:var(--ink-soft); font-size:15px; font-weight:500; }
.nav-links a:hover { color:var(--ink); text-decoration:none; }
.theme-btn { background:none; border:1px solid var(--line-2); color:var(--ink-soft); width:34px; height:34px; border-radius:9px; cursor:pointer; font-size:15px; line-height:1; display:grid; place-items:center; }
.theme-btn:hover { color:var(--ink); border-color:var(--ink-faint); }
.nav-toggle { display:none; }

@media (max-width: 720px) {
  .nav-links { position:fixed; inset:64px 0 auto 0; flex-direction:column; align-items:flex-start; gap:0; background:var(--paper); border-bottom:1px solid var(--line); padding:8px 24px 16px; margin:0; transform:translateY(-120%); transition:transform .22s ease; }
  .nav-links.open { transform:translateY(0); }
  .nav-links a { padding:12px 0; width:100%; border-bottom:1px solid var(--line); font-size:17px; }
  .nav-toggle { display:grid; place-items:center; margin-left:auto; width:38px; height:38px; background:none; border:1px solid var(--line-2); border-radius:9px; color:var(--ink); cursor:pointer; }
  .theme-btn { margin-left:0; }
}

/* ---------- Typography ---------- */
h1,h2,h3,h4 { font-family:var(--serif); color:var(--ink); line-height:1.15; letter-spacing:-.015em; margin:0 0 .5em; }
h1 { font-size: clamp(2rem, 5.5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); margin-top:1.4em; }
h3 { font-size: 1.32rem; margin-top:1.6em; }
p { margin: 0 0 1.1em; }
.lead { font-size: clamp(1.15rem, 2.4vw, 1.45rem); color: var(--ink-soft); line-height:1.5; }
.eyebrow { font-family:var(--sans); text-transform:uppercase; letter-spacing:.14em; font-size:12.5px; font-weight:700; color:var(--accent); margin:0 0 14px; }
.muted { color: var(--ink-soft); }

/* ---------- Buttons ---------- */
.btn { display:inline-flex; align-items:center; gap:8px; font-family:var(--sans); font-weight:600; font-size:15px; padding:12px 20px; border-radius:11px; border:1px solid transparent; cursor:pointer; transition:transform .12s ease, background .2s; }
.btn:hover { text-decoration:none; transform:translateY(-1px); }
.btn-primary { background:var(--accent); color:#fff; }
.btn-primary:hover { background:var(--accent-ink); color:#fff; }
.btn-ghost { background:transparent; color:var(--ink); border-color:var(--line-2); }
.btn-ghost:hover { border-color:var(--ink-faint); }

/* ---------- Hero ---------- */
.hero { padding: 76px 0 56px; }
.hero h1 { max-width: 16ch; }
.hero .lead { max-width: 54ch; margin-top:6px; }
.hero-actions { display:flex; gap:14px; flex-wrap:wrap; margin-top:28px; }

/* ---------- Sections ---------- */
section { padding: 8px 0; }
.section-pad { padding: 44px 0; }
.section-head { max-width: 62ch; margin-bottom: 26px; }
.divider { border:0; border-top:1px solid var(--line); margin:56px 0; }

/* ---------- Cards / grid ---------- */
.grid { display:grid; gap:20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px){ .grid-3{ grid-template-columns:1fr 1fr; } }
@media (max-width: 620px){ .grid-3,.grid-2{ grid-template-columns:1fr; } }

.card { background:var(--card); border:1px solid var(--line); border-radius:16px; padding:24px; box-shadow:var(--shadow); transition:transform .14s ease, border-color .2s; display:flex; flex-direction:column; }
a.card:hover { text-decoration:none; transform:translateY(-3px); border-color:var(--line-2); }
.card .kicker { font-size:12.5px; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--accent); margin-bottom:10px; }
.card h3 { margin:0 0 8px; font-size:1.28rem; }
.card p { color:var(--ink-soft); font-size:16px; margin:0; }
.card .more { margin-top:auto; padding-top:16px; color:var(--accent-ink); font-weight:600; font-size:15px; }

/* Pillar tiles on home */
.pillar { position:relative; overflow:hidden; }
.pillar .num { font-family:var(--serif); font-size:14px; color:var(--ink-faint); margin-bottom:6px; }

/* Article list */
.post-list { list-style:none; margin:0; padding:0; }
.post-list li { border-top:1px solid var(--line); }
.post-list li:last-child { border-bottom:1px solid var(--line); }
.post-list a { display:flex; gap:18px; align-items:baseline; padding:20px 4px; color:var(--ink); }
.post-list a:hover { text-decoration:none; color:var(--accent-ink); }
.post-list .p-title { font-family:var(--serif); font-size:1.28rem; flex:1; letter-spacing:-.01em; }
.post-list .p-meta { color:var(--ink-faint); font-size:14px; white-space:nowrap; }
.soon { color:var(--ink-faint); font-size:12px; border:1px solid var(--line-2); border-radius:999px; padding:2px 9px; margin-left:8px; white-space:nowrap; }

/* Tag pills */
.tags { display:flex; flex-wrap:wrap; gap:8px; margin:0; padding:0; list-style:none; }
.tags li { font-size:13px; color:var(--ink-soft); background:var(--paper-2); border:1px solid var(--line); border-radius:999px; padding:5px 12px; }

/* ---------- Article ---------- */
.article { padding: 40px 0 20px; }
.article-head { max-width: var(--readw); margin:0 auto 8px; }
.breadcrumb { font-size:14px; color:var(--ink-faint); margin-bottom:20px; }
.breadcrumb a { color:var(--ink-soft); }
.article-meta { display:flex; gap:14px; align-items:center; color:var(--ink-faint); font-size:14.5px; margin:18px 0 0; }
.prose { max-width: var(--readw); margin:0 auto; }
.prose h2 { margin-top:1.8em; }
.prose p, .prose li { font-size: 1.075rem; }
.prose ul, .prose ol { padding-left:1.3em; margin:0 0 1.2em; }
.prose li { margin-bottom:.5em; }
.prose blockquote { margin:1.6em 0; padding:6px 0 6px 22px; border-left:3px solid var(--accent); font-family:var(--serif); font-size:1.28rem; line-height:1.45; color:var(--ink); }
.prose strong { color:var(--ink); }
.prose code { font-family:var(--mono); font-size:.88em; background:var(--paper-2); border:1px solid var(--line); border-radius:6px; padding:1px 6px; }
.callout { background:var(--paper-2); border:1px solid var(--line); border-left:3px solid var(--accent); border-radius:12px; padding:20px 22px; margin:1.8em 0; }
.callout p:last-child { margin-bottom:0; }
.callout .callout-label { font-weight:700; font-size:13px; letter-spacing:.06em; text-transform:uppercase; color:var(--accent); display:block; margin-bottom:8px; }

/* FAQ */
.faq { max-width:var(--readw); margin:0 auto; }
.faq details { border-top:1px solid var(--line); padding:6px 0; }
.faq details:last-of-type { border-bottom:1px solid var(--line); }
.faq summary { cursor:pointer; font-family:var(--serif); font-size:1.18rem; padding:16px 0; list-style:none; display:flex; justify-content:space-between; gap:16px; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; color:var(--accent); font-size:1.4rem; line-height:1; }
.faq details[open] summary::after { content:"\2013"; }
.faq details p { padding:0 0 16px; color:var(--ink-soft); }

/* CTA band */
.cta-band { background:var(--paper-2); border:1px solid var(--line); border-radius:20px; padding:40px; text-align:center; margin:56px 0; }
.cta-band h2 { margin-top:0; }
.cta-band .lead { max-width:52ch; margin:0 auto 22px; }

/* ---------- Footer ---------- */
.site-footer { border-top:1px solid var(--line); margin-top:64px; padding:44px 0 56px; color:var(--ink-soft); font-size:15px; }
.footer-grid { display:flex; flex-wrap:wrap; gap:40px; justify-content:space-between; }
.footer-brand { max-width:34ch; }
.footer-col h4 { font-family:var(--sans); font-size:12.5px; text-transform:uppercase; letter-spacing:.1em; color:var(--ink-faint); margin:0 0 12px; }
.footer-col a { display:block; color:var(--ink-soft); padding:4px 0; }
.footer-col a:hover { color:var(--ink); text-decoration:none; }
.footer-bottom { margin-top:36px; padding-top:20px; border-top:1px solid var(--line); font-size:14px; color:var(--ink-faint); }

/* utilities */
.center { text-align:center; }
.mt-0 { margin-top:0; }
.stack > * + * { margin-top:14px; }