/* Praescia — main.css
   Shared stylesheet for praescia.co
   Theme-aware (light + dark via prefers-color-scheme)
   No external CDN dependencies — self-contained
*/

/* -----------------------------------------------------------
   1. Design tokens
------------------------------------------------------------ */
:root {
  --ink:            #0D1B2A;
  --paper:          #F5F7F4;
  --paper-muted:    #E8EDE6;
  --paper-card:     #FFFFFF;
  --card-border:    rgba(13, 27, 42, 0.08);
  --meta:           #4A5A6A;
  --accent:         #1A7A5E;
  --success:        #1E6E42;
  --warning:        #B8730B;
  --danger:         #A32E30;

  /* Product brand tokens */
  --praescia:          #1A7A5E;   /* manufacturing — biological teal */
  --praescia-muted:    rgba(26, 122, 94, 0.10);
  --praescia-border:   rgba(26, 122, 94, 0.25);
  --praescigenics:     #3B5BA8;   /* genetics — genomics indigo */
  --praescigenics-muted:  rgba(59, 91, 168, 0.10);
  --praescigenics-border: rgba(59, 91, 168, 0.25);

  --font-serif:     'Cormorant Garamond', 'EB Garamond', 'Palatino Linotype', 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 {
    --praescia:          #3DB38A;
    --praescia-muted:    rgba(61, 179, 138, 0.12);
    --praescia-border:   rgba(61, 179, 138, 0.28);
    --praescigenics:     #7B9FE8;
    --praescigenics-muted:  rgba(123, 159, 232, 0.12);
    --praescigenics-border: rgba(123, 159, 232, 0.28);
    --ink:          #EDF2EC;
    --paper:        #0D1610;
    --paper-muted:  #162218;
    --paper-card:   #162218;
    --card-border:  rgba(255, 255, 255, 0.08);
    --meta:         #8FA89A;
    --accent:       #3DB38A;
    --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow:       0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="light"] {
  --ink:          #0D1B2A;
  --paper:        #F5F7F4;
  --paper-muted:  #E8EDE6;
  --paper-card:   #FFFFFF;
  --card-border:  rgba(13, 27, 42, 0.08);
  --meta:         #4A5A6A;
  --accent:       #1A7A5E;
  --shadow-sm:    0 1px 2px rgba(13, 27, 42, 0.05);
  --shadow:       0 4px 12px rgba(13, 27, 42, 0.08);
}

:root[data-theme="dark"],
:root:not([data-theme="light"]) {
  @media (prefers-color-scheme: dark) {
    --ink:          #EDF2EC;
    --paper:        #0D1610;
    --paper-muted:  #162218;
    --paper-card:   #162218;
    --card-border:  rgba(255, 255, 255, 0.08);
    --meta:         #8FA89A;
    --accent:       #3DB38A;
    --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow:       0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --ink:          #EDF2EC;
  --paper:        #0D1610;
  --paper-muted:  #162218;
  --paper-card:   #162218;
  --card-border:  rgba(255, 255, 255, 0.08);
  --meta:         #8FA89A;
  --accent:       #3DB38A;
  --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;
}
.eyebrow {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.text-meta { color: var(--meta); font-size: 14px; line-height: 1.5; }
.text-center { text-align: center; }
.text-center p { margin-left: auto; margin-right: auto; }

/* -----------------------------------------------------------
   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(--accent); }
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) !important;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.15s ease;
}
header.site .cta:hover { opacity: 0.85; text-decoration: none; }

/* -----------------------------------------------------------
   6. Buttons
------------------------------------------------------------ */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.15s ease, background 0.15s ease;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { opacity: 0.85; text-decoration: none; }
.btn-secondary { background: var(--paper-muted); color: var(--ink); }
.btn-secondary:hover { background: var(--card-border); text-decoration: none; }
.actions { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-top: var(--space-6); }

/* -----------------------------------------------------------
   7. 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(220px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.card {
  background: var(--paper-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.card h3 { margin-top: 0; }
.card.filled {
  background: var(--paper-muted);
  border-color: transparent;
}
.card.accent-border {
  border-left: 3px solid var(--accent);
}

.invariant-card {
  padding: var(--space-5) 0;
  border-top: 2px solid var(--card-border);
}
.invariant-card .num {
  font-size: 28px;
  font-family: var(--font-mono);
  color: var(--accent);
  display: block;
  margin-bottom: var(--space-3);
}
.invariant-card h3 { margin-top: 0; }

.callout {
  background: var(--paper-muted);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-5) var(--space-6);
  margin: var(--space-5) 0;
}
.callout p { max-width: none; margin: 0; }

/* -----------------------------------------------------------
   8. Status indicators
------------------------------------------------------------ */
.status {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
}
.status.ok { background: rgba(26, 122, 94, 0.12); color: var(--accent); }
.status.progress { background: rgba(184, 115, 11, 0.12); color: var(--warning); }
.status.pending { background: var(--paper-muted); color: var(--meta); }

/* -----------------------------------------------------------
   9. Tables
------------------------------------------------------------ */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-size: 11px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--meta); padding: 10px 16px; border-bottom: 2px solid var(--card-border); }
td { padding: 12px 16px; border-bottom: 1px solid var(--card-border); color: var(--ink); vertical-align: top; }
tr:last-child td { border-bottom: none; }

/* -----------------------------------------------------------
   10. Key-value list
------------------------------------------------------------ */
dl.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 24px; font-size: 14px; }
dl.kv dt { font-weight: 600; color: var(--meta); white-space: nowrap; }
dl.kv dd { margin: 0; }

/* -----------------------------------------------------------
   11. Footer
------------------------------------------------------------ */
footer.site {
  border-top: 1px solid var(--card-border);
  padding: var(--space-8) 0 var(--space-6);
  margin-top: var(--space-9);
}
footer.site .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-7);
  align-items: start;
}
footer.site .brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  margin-bottom: var(--space-4);
}
footer.site .brand .mark { width: 24px; height: 24px; color: var(--accent); }
footer.site .brand .wordmark {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--ink);
}
footer.site p.text-meta { max-width: 44ch; }
footer.site nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-end;
}
footer.site nav a {
  text-decoration: none;
  font-size: 13px;
  color: var(--meta);
}
footer.site nav a:hover { color: var(--ink); }
.footer-copy {
  border-top: 1px solid var(--card-border);
  padding-top: var(--space-5);
  margin-top: var(--space-5);
  font-size: 12px;
  color: var(--meta);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* -----------------------------------------------------------
   12. Blog
------------------------------------------------------------ */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--card-border);
}
.post-list li:first-child { border-top: 1px solid var(--card-border); }
.post-meta { font-size: 12px; color: var(--meta); margin-bottom: var(--space-2); }
.post-list a.post-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-2);
}
.post-list a.post-title:hover { text-decoration: underline; }

article.post h2, article.post h3 { margin-top: var(--space-7); }
article.post p, article.post li { max-width: 72ch; }

/* -----------------------------------------------------------
   13. Form styles
------------------------------------------------------------ */
.form-field { display: flex; flex-direction: column; margin-bottom: 20px; }
.form-field label { font-size: 13px; color: var(--meta); margin-bottom: 6px; font-weight: 600; }
.form-field input, .form-field select, .form-field textarea {
  padding: 12px 14px;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-note { font-size: 12px; color: var(--meta); margin-top: 8px; }

/* -----------------------------------------------------------
   14. Product comparison cards (products.html)
------------------------------------------------------------ */
.product-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
}
@media (max-width: 900px) {
  .product-split { grid-template-columns: 1fr; }
}

.product-card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.product-card__header {
  padding: var(--space-7) var(--space-6) var(--space-5);
  border-bottom: 1px solid var(--card-border);
}
.product-card__body {
  padding: var(--space-6);
  background: var(--paper-card);
  flex: 1;
}
.product-card__footer {
  padding: var(--space-5) var(--space-6);
  background: var(--paper-muted);
  border-top: 1px solid var(--card-border);
}

/* Praescia variant */
.product-card.praescia .product-card__header {
  background: var(--praescia-muted);
  border-top: 4px solid var(--praescia);
}
.product-card.praescia .product-tag { color: var(--praescia); }
.product-card.praescia .product-mark { color: var(--praescia); }
.product-card.praescia .status-pill { background: var(--praescia-muted); color: var(--praescia); border: 1px solid var(--praescia-border); }
.product-card.praescia .btn-product { background: var(--praescia); color: #fff; }
.product-card.praescia .btn-product:hover { opacity: .85; }
.product-card.praescia ul li::marker { color: var(--praescia); }

/* Praescigenics variant */
.product-card.praescigenics .product-card__header {
  background: var(--praescigenics-muted);
  border-top: 4px solid var(--praescigenics);
}
.product-card.praescigenics .product-tag { color: var(--praescigenics); }
.product-card.praescigenics .product-mark { color: var(--praescigenics); }
.product-card.praescigenics .status-pill { background: var(--praescigenics-muted); color: var(--praescigenics); border: 1px solid var(--praescigenics-border); }
.product-card.praescigenics .btn-product { background: var(--praescigenics); color: #fff; }
.product-card.praescigenics .btn-product:hover { opacity: .85; }
.product-card.praescigenics ul li::marker { color: var(--praescigenics); }

.product-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}
.product-name {
  font-family: var(--font-serif);
  font-size: clamp(30px, 3.5vw, 42px);
  font-weight: 500;
  line-height: 1.1;
  margin: 0 0 var(--space-2);
  color: var(--ink);
}
.product-tagline {
  font-size: 15px;
  color: var(--meta);
  margin: 0;
  font-style: italic;
}
.product-mark { width: 40px; height: 40px; display: block; margin-bottom: var(--space-4); }
.status-pill {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: var(--space-5);
}
.btn-product {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s ease;
}
.btn-product-ghost {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--card-border);
  color: var(--meta);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.btn-product-ghost:hover { border-color: var(--meta); color: var(--ink); text-decoration: none; }

.compare-table td:first-child { font-weight: 600; width: 34%; }
.compare-table .val-praescia { color: var(--praescia); }
.compare-table .val-px { color: var(--praescigenics); }

/* Praescigenics-specific accents on dedicated page */
.praescigenics-accent { color: var(--praescigenics); }
.praescigenics-bg { background: var(--praescigenics-muted); border: 1px solid var(--praescigenics-border); border-radius: var(--radius); padding: var(--space-5) var(--space-6); }
.praescia-accent { color: var(--praescia); }

/* -----------------------------------------------------------
   16. Responsive
------------------------------------------------------------ */
@media (max-width: 768px) {
  header.site nav { gap: var(--space-4); }
  header.site nav a:not(.cta) { display: none; }
  footer.site .container { grid-template-columns: 1fr; }
  footer.site nav { align-items: flex-start; flex-direction: row; flex-wrap: wrap; }
  .footer-copy { flex-direction: column; }
}

@media (max-width: 480px) {
  .actions { flex-direction: column; }
  .btn { text-align: center; }
}