/* Posterity Labs LLC — styles.css
   Modern, accessible, business-first design.
   Color palette uses CSS variables for easy theming.
*/

/* CSS Reset (trimmed) */
*,
*::before,
*::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; height: auto; }
ul, ol { margin: 0; padding: 0 0 0 1.25rem; }
h1, h2, h3, h4, p { margin: 0 0 0.75rem 0; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--brand-500); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* Theme */
:root {
  --bg: #0b0f14;
  --surface: #ffffff;
  --text: #0b0f14;
  --muted: #606b85;
  --border: #e6e8f0;
  --brand-600: #2346f0;
  --brand-500: #3a5bff;
  --brand-400: #6e85ff;
  --brand-100: #eef1ff;
  --accent-400: #0ea5e9;
  --ok: #1a9e5a;
  --warn: #d97706;
  --danger: #e11d48;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.06), 0 1px 1px rgba(16,24,40,.08);
  --shadow-md: 0 6px 20px rgba(16,24,40,.10);
  --shadow-lg: 0 24px 48px rgba(16,24,40,.18);

  --container: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #0b0f14;
    --text: #f5f7fb;
    --muted: #9aa3b2;
    --border: #1c2230;
    --brand-600: #6e85ff;
    --brand-500: #6e85ff;
    --brand-400: #93a4ff;
    --brand-100: #1a223b;
  }
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--surface);
  color: var(--text);
  line-height: 1.6;
}

/* Layout helpers */
.container { width: min(100% - 2rem, var(--container)); margin-inline: auto; }
.section { padding: 5rem 0; position: relative; }
.section.alt { background: linear-gradient(180deg, rgba(110,133,255,0.05), transparent); }
.section-header { text-align: left; margin-bottom: 2rem; }
.grid-2 { display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
@media (max-width: 1100px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 700px) { .grid-4 { grid-template-columns: 1fr; } }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }
.stack { display: flex; flex-direction: column; }
.row { display: flex; align-items: center; }
.wrap { flex-wrap: wrap; }
.gap-sm { gap: .5rem; }
.gap-md { gap: 1rem; }
.pill { border: 1px solid var(--border); border-radius: 999px; padding: .4rem .75rem; font-size: .9rem; color: var(--muted); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(11,15,20,0.75); }
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 700; letter-spacing: .2px; }
.brand-text { white-space: nowrap; }
.primary-nav { display: flex; align-items: center; gap: 1rem; }
.nav-toggle { display: none; border: 1px solid var(--border); border-radius: var(--radius-sm); background: transparent; padding: .5rem; }
.nav-toggle svg { width: 24px; height: 24px; }
.nav-list { display: flex; align-items: center; gap: 1rem; list-style: none; padding: 0; margin: 0; }
.nav-list a { padding: .4rem .6rem; border-radius: .5rem; font-weight: 500; color: var(--muted); }
.nav-list a.active { color: var(--text); background: var(--brand-100); }
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .nav-list { position: absolute; top: calc(100% + 1px); right: 1rem; background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-sm); padding: .75rem; border-radius: var(--radius-md); flex-direction: column; align-items: stretch; min-width: 240px; display: none; }
  .nav-list.open { display: flex; }
  .nav-list a { color: var(--text); }
}

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .75rem 1rem; border-radius: .6rem; border: 1px solid var(--border); text-decoration: none; font-weight: 600; }
.btn--small { padding: .5rem .75rem; font-size: .9rem; }
.btn--primary { background: linear-gradient(135deg, var(--brand-500), var(--accent-400)); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(58,91,255,.25); }
.btn--ghost { background: transparent; }
.btn--disabled { opacity: .6; pointer-events: none; }
.actions { display: flex; gap: .75rem; align-items: center; flex-wrap: wrap; }

/* Hero */
.hero { padding-top: 7rem; }
.hero.small { padding-top: 5rem; }
.display { font-size: clamp(2rem, 4vw + 1rem, 3.5rem); line-height: 1.1; letter-spacing: -0.02em; }
.lead { font-size: 1.125rem; color: var(--muted); max-width: 58ch; }
.trust { margin-top: .5rem; }
.hero-visual { display: grid; place-items: center; }
.glass-card {
  width: 100%; max-width: 420px; border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.2));
  border: 1px solid var(--border); box-shadow: var(--shadow-lg); overflow: hidden;
}
@media (prefers-color-scheme: dark) {
  .glass-card { background: linear-gradient(180deg, rgba(26,32,44,.5), rgba(17,24,39,.3)); }
}
.glass-header, .glass-footer { padding: .75rem 1rem; font-weight: 600; border-bottom: 1px solid var(--border); }
.glass-footer { border-top: 1px solid var(--border); border-bottom: 0; }
.glass-body { padding: 1rem; }
.glass-line { height: 10px; border-radius: 6px; background: linear-gradient(90deg, var(--brand-100), transparent); margin-bottom: .5rem; }
.glass-line.short { width: 60%; }

.section-bg {
  position: absolute; inset: 0 -10vw auto -10vw; height: 46rem; z-index: -1;
  background: radial-gradient(80% 50% at 10% 10%, rgba(58,91,255,.18), transparent 60%),
              radial-gradient(80% 50% at 90% 20%, rgba(14,165,233,.18), transparent 60%);
  filter: blur(20px);
}

/* Cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }
.card {
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.25rem; background: rgba(255,255,255,.8);
  box-shadow: var(--shadow-sm);
}
@media (prefers-color-scheme: dark) { .card { background: rgba(11,15,20,.6); } }
.card-header { display: flex; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: .5rem; }
.badge { font-size: .8rem; color: var(--brand-600); background: var(--brand-100); border-radius: 999px; padding: .25rem .5rem; border: 1px solid var(--border); }
.checklist { list-style: none; padding: 0; }
.checklist li { position: relative; padding-left: 1.5rem; margin: .4rem 0; }
.checklist li::before { content: ""; position: absolute; left: 0; top: .45rem; width: .9rem; height: .9rem; border-radius: 3px; background: linear-gradient(135deg, var(--ok), var(--brand-500)); }

.card-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .75rem; }
.disclaimer { color: var(--muted); font-size: .9rem; margin-top: .5rem; }

/* Product */
.product { display: grid; grid-template-columns: 1.1fr .9fr; gap: 2rem; align-items: start; }
@media (max-width: 900px) { .product { grid-template-columns: 1fr; } }
.product-title { font-size: 1.6rem; }
.feature-list { list-style: none; padding: 0; columns: 2; column-gap: 1rem; }
@media (max-width: 700px) { .feature-list { columns: 1; } }
.feature-list li { margin: .3rem 0; position: relative; padding-left: 1.25rem; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: .6rem; width: .5rem; height: .5rem; border-radius: 50%; background: var(--brand-500); }
.pricing { display: grid; gap: .5rem; align-items: start; padding-top: .5rem; }
.price { font-size: 1.25rem; }
.note { color: var(--muted); }
.specs { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem 1rem; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem; }
.specs dt { font-weight: 600; }
.specs dd { margin: 0; color: var(--muted); }

/* Forms */
.field { display: grid; gap: .3rem; margin: .6rem 0; }
.field span { font-weight: 600; font-size: .95rem; }
input[type="text"], input[type="email"], textarea {
  border: 1px solid var(--border); border-radius: .6rem; padding: .75rem .9rem; background: transparent;
}
input:focus-visible, textarea:focus-visible { border-color: var(--brand-500); box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand-500) 30%, transparent); }
fieldset.field { border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1rem 1.25rem; margin: .6rem 0; }
fieldset.field legend { font-weight: 600; padding: 0 .25rem; }
fieldset.field p { margin-bottom: .75rem; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: .5rem 1rem; }
.checkbox-group label { display: inline-flex; align-items: center; gap: .4rem; font-weight: 500; }
.field.nested { margin-top: .75rem; }
.field.nested span { font-weight: 500; }
.err { color: var(--danger); font-size: .85rem; min-height: 1.1em; }
.form-status { margin-top: .5rem; }
.small { font-size: .9rem; }
.muted { color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 2rem; align-items: start; }
.footer-nav, .footer-legal { display: flex; gap: 1rem; flex-wrap: wrap; }
.footer-nav a, .footer-legal a { color: var(--muted); }
.footer-brand { display: grid; gap: .25rem; align-items: start; }

/* Misc */
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; background: var(--surface); padding: .5rem .75rem; border: 1px solid var(--border); border-radius: .5rem; z-index: 100; }
.to-top { position: fixed; right: 1rem; bottom: 1rem; width: 44px; height: 44px;
  display: grid; place-items: center; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); box-shadow: var(--shadow-sm);
  opacity: 0; transform: translateY(10px); pointer-events: none; transition: .2s ease;
}
.to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.to-top svg { width: 22px; height: 22px; }

/* Utilities */
.bp-md-hide { display: none; }
@media (max-width: 900px) { .bp-md-hide { display: inline; } }