/* Praesensus - main.css
   Shared stylesheet for praesensus.com
   Theme-aware (light + dark via prefers-color-scheme)
   No external CDN dependencies - self-contained
*/

/* -----------------------------------------------------------
   1. Design tokens (CSS custom properties)
------------------------------------------------------------ */
:root {
  --ink:            #0D1B2A;
  --paper:          #F7F5EF;
  --paper-muted:    #EEECE5;
  --paper-card:     #FFFFFF;
  --card-border:    rgba(13, 27, 42, 0.08);
  --meta:           #4A5A70;
  --accent:         #A58F5D;
  --success:        #2C7A4A;
  --warning:        #B8730B;
  --danger:         #A32E30;

  --font-serif:     'Cormorant Garamond', 'EB Garamond', 'Palatino Linotype', 'Palatino', Georgia, serif;
  --font-sans:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono:      'SF Mono', ui-monospace, Menlo, Consolas, monospace;

  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;

  --container-max: 1200px;
  --container-narrow: 900px;

  --shadow-sm: 0 1px 2px rgba(13, 27, 42, 0.05);
  --shadow:    0 4px 12px rgba(13, 27, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:          #F2EDE0;
    --paper:        #0F1620;
    --paper-muted:  #182333;
    --paper-card:   #182333;
    --card-border:  rgba(255, 255, 255, 0.08);
    --meta:         #9CA9BC;
    --accent:       #C4A87A;
    --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow:       0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

/* -----------------------------------------------------------
   2. Reset + base
------------------------------------------------------------ */
*, *::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(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; transition: text-decoration-thickness 0.15s ease; }
a:hover { text-decoration-thickness: 2px; }
button { font-family: inherit; cursor: pointer; }

/* -----------------------------------------------------------
   3. Typography
------------------------------------------------------------ */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--ink);
  margin: 0 0 var(--space-4);
  line-height: 1.15;
}
h1 { font-size: clamp(36px, 5vw, 56px); }
h2 { font-size: clamp(28px, 3.5vw, 40px); margin-top: var(--space-7); }
h3 { font-size: clamp(20px, 2.2vw, 26px); margin-top: var(--space-6); }
h4 { font-size: 18px; margin-top: var(--space-5); }
p, ul, ol { margin: 0 0 var(--space-4); }
p { max-width: 68ch; }
ul, ol { padding-left: var(--space-5); }
li { margin: var(--space-2) 0; }
li p { margin-bottom: 0; }
strong { font-weight: 600; }
em { font-style: italic; }
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--paper-muted);
  padding: 2px 6px;
  border-radius: 3px;
}
.num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}
.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--accent);
  text-transform: uppercase;
}
.lede {
  font-size: 20px;
  color: var(--meta);
  max-width: 720px;
  line-height: 1.55;
}

/* -----------------------------------------------------------
   4. Layout containers
------------------------------------------------------------ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.container.narrow { max-width: var(--container-narrow); }

section { padding: var(--space-8) 0; }
section.hero { padding: var(--space-9) 0 var(--space-8); }
section.tight { padding: var(--space-7) 0; }

.rule { height: 1px; background: var(--card-border); border: 0; margin: var(--space-6) 0; }

/* -----------------------------------------------------------
   5. Header + nav
------------------------------------------------------------ */
header.site {
  position: sticky;
  top: 0;
  background: var(--paper);
  border-bottom: 1px solid var(--card-border);
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
header.site .container {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}
header.site .brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
header.site .brand .mark { width: 32px; height: 32px; color: var(--ink); }
header.site .brand .wordmark {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.4px;
  color: var(--ink);
}
header.site nav {
  display: flex;
  gap: var(--space-5);
  margin-left: auto;
  align-items: center;
}
header.site nav a {
  text-decoration: none;
  font-size: 14px;
  color: var(--meta);
  transition: color 0.15s ease;
}
header.site nav a:hover, header.site nav a.active { color: var(--ink); }
header.site .cta {
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.15s ease;
}
header.site .cta:hover { opacity: 0.9; }

@media (max-width: 800px) {
  header.site nav { display: none; }
  header.site nav.mobile-open { display: flex; flex-direction: column; position: absolute; top: 100%; right: 0; left: 0; background: var(--paper); border-bottom: 1px solid var(--card-border); padding: var(--space-4); }
}

/* -----------------------------------------------------------
   6. Hero
------------------------------------------------------------ */
.hero h1 { max-width: 900px; margin-bottom: var(--space-5); }
.hero .lede { max-width: 720px; margin-bottom: var(--space-6); }
.hero .actions { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-6); }

/* -----------------------------------------------------------
   7. Buttons + CTA
------------------------------------------------------------ */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary { background: transparent; color: var(--ink); border: 1px solid var(--card-border); }
.btn-secondary:hover { border-color: var(--ink); }
.btn-ghost { background: transparent; color: var(--meta); text-decoration: underline; padding: 12px 0; }
.btn-ghost:hover { color: var(--ink); }

/* -----------------------------------------------------------
   8. Cards + grids
------------------------------------------------------------ */
.grid {
  display: grid;
  gap: var(--space-5);
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  background: var(--paper);
}
.card.filled { background: var(--paper-muted); }
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.card .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--paper-muted);
  color: var(--ink);
  margin-bottom: var(--space-3);
}

/* -----------------------------------------------------------
   9. Callouts
------------------------------------------------------------ */
.callout {
  border-left: 3px solid var(--accent);
  padding: var(--space-4) var(--space-5);
  background: var(--paper-muted);
  border-radius: var(--radius-sm);
  margin: var(--space-5) 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--ink); }

.invariant-card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  background: var(--paper);
}
.invariant-card .num {
  display: inline-block;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--paper-muted);
  color: var(--ink);
  text-align: center;
  line-height: 32px;
  font-family: var(--font-serif);
  font-size: 18px;
  margin-bottom: var(--space-3);
}

/* -----------------------------------------------------------
  10. Tables
------------------------------------------------------------ */
.table-wrap { overflow-x: auto; margin: var(--space-5) 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--card-border);
  vertical-align: top;
}
th {
  color: var(--meta);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
tr.total td { border-top: 2px solid var(--ink); border-bottom: none; font-weight: 700; }

/* -----------------------------------------------------------
  11. Footer
------------------------------------------------------------ */
footer.site {
  border-top: 1px solid var(--card-border);
  padding: var(--space-7) 0 var(--space-6);
  margin-top: var(--space-8);
  background: var(--paper);
}
footer.site .container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-6);
}
footer.site .brand-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
footer.site .brand-col .mark { width: 40px; height: 40px; color: var(--ink); margin-bottom: var(--space-2); }
footer.site .brand-col .wordmark { font-family: var(--font-serif); font-size: 24px; font-weight: 500; }
footer.site .brand-col p { color: var(--meta); font-size: 14px; margin: 0; }
footer.site h4 {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--meta);
  margin: 0 0 var(--space-3);
}
footer.site ul { list-style: none; padding: 0; margin: 0; }
footer.site ul li { margin: var(--space-2) 0; }
footer.site ul li a { color: var(--ink); text-decoration: none; font-size: 14px; }
footer.site ul li a:hover { text-decoration: underline; }
footer.site .copyright {
  border-top: 1px solid var(--card-border);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  color: var(--meta);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 800px) {
  footer.site .container { grid-template-columns: 1fr 1fr; }
  footer.site .brand-col { grid-column: 1 / -1; }
}

/* -----------------------------------------------------------
  12. Status badges
------------------------------------------------------------ */
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.status.ok       { background: rgba(44,122,74,0.12); color: var(--success); }
.status.progress { background: rgba(184,115,11,0.12); color: var(--warning); }
.status.plan     { background: rgba(74,90,112,0.12); color: var(--meta); }

/* -----------------------------------------------------------
  13. Utilities
------------------------------------------------------------ */
.text-meta { color: var(--meta); }
.text-center { text-align: center; }
.text-accent { color: var(--accent); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-5 { margin-top: var(--space-5); }
.mb-5 { margin-bottom: var(--space-5); }
.hide { display: none; }

/* -----------------------------------------------------------
  14. Page banner / eyebrow
------------------------------------------------------------ */
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

/* -----------------------------------------------------------
  15. Print
------------------------------------------------------------ */
@media print {
  header.site, footer.site nav, .cta { display: none; }
  body { background: white; color: black; }
  a { color: black; }
}