/* ================================================================
   Altabric — styles.css
   Static brochure site. No framework. No build step.
   ================================================================ */

/* ── Design tokens ──────────────────────────────────────────────── */
:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --border: #e2dfd9;
  --border-soft: #ecebe6;
  --ink: #1f2933;
  --ink-soft: #5a6470;
  --ink-faint: #8a929c;

  --c-graphite: #5d707f;
  --c-slate: #6d8a96;
  --c-blue: #8797b2;
  --c-purple: #a7a5c6;
  --c-green: #16A34A;
  --c-green-dark: #128a3e;

  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'DM Mono', 'SF Mono', 'Fira Code', monospace;

  --max-w: 680px;
  --page-px: 24px;
  --section-py: 96px;
  --radius: 8px;
}

/* ── Reset ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--c-green); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ── Typography ─────────────────────────────────────────────────── */
h1 {
  font-size: 44px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--ink);
}
h2 {
  font-size: 28px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.3px;
  color: var(--ink);
}
h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}
p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 16px;
}
p:last-child { margin-bottom: 0; }

.section-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-green);
  margin-bottom: 12px;
}
.section-lede {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 620px;
}

/* ── Layout ─────────────────────────────────────────────────────── */
.page-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--page-px);
}
.section {
  padding: var(--section-py) 0;
}
.section + .section {
  border-top: 1px solid var(--border-soft);
}

/* ── Nav ────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  padding: 0 var(--page-px);
  height: 72px;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  margin-right: 48px;
}
.nav__mark { width: 40px; height: 40px; }
.nav__wordmark {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--ink);
}
.nav__links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.15s;
}
.nav__link:hover { color: var(--c-green); }

/* Mobile hamburger */
.nav__hamburger {
  display: none;
  background: none;
  border: none;
  padding: 4px;
  color: var(--ink);
}
.nav__hamburger svg { width: 24px; height: 24px; }

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  border: 1.5px solid transparent;
}
.btn--primary {
  background: var(--c-green);
  color: #ffffff;
  border-color: var(--c-green);
}
.btn--primary:hover {
  background: var(--c-green-dark);
  border-color: var(--c-green-dark);
  color: #ffffff;
}
.btn--secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--c-graphite);
  border-width: 0.5px;
}
.btn--secondary:hover {
  border-color: rgba(93, 112, 127, 0.6);
  color: var(--ink);
}

/* ── Hero ───────────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/patterns/hero-dotgrid.svg');
  background-repeat: repeat;
  pointer-events: none;
}
.hero__content {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--page-px);
}
.hero h1 { margin-bottom: 16px; }
.hero__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 20px;
}
.hero__sub {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero__ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Cards ──────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card--bordered-left {
  border-left-width: 3px;
}

/* Principle cards (section 3) */
.principles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.principle-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--c-graphite);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
}
.principle-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}
.principle-card p {
  font-size: 14px;
  margin-bottom: 0;
}

/* Use case cards (section 4) */
.usecases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.usecase-card__icon {
  font-size: 28px;
  color: var(--c-graphite);
  margin-bottom: 12px;
  line-height: 1;
}
.usecase-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}
.usecase-card p {
  font-size: 14px;
  margin-bottom: 0;
}

/* ── Diagram (section 5) ────────────────────────────────────────── */
.diagram-wrap {
  margin: 32px 0 16px;
  overflow-x: auto;
  cursor: pointer;
}
.diagram-wrap svg {
  width: 100%;
  max-width: 900px;
  height: auto;
  margin: 0 auto;
  display: block;
}

/* Diagram lightbox */
.diagram-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  padding: 24px;
}
.diagram-overlay svg {
  width: 95vw;
  max-width: 1200px;
  height: auto;
  max-height: 90vh;
  background: var(--bg);
  border-radius: 12px;
  padding: 32px;
}
.diagram-caption {
  font-size: 14px;
  color: var(--ink-soft);
  font-style: italic;
  text-align: center;
  margin-top: 16px;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* ── Audience split (section 6) ──────────────────────────────────── */
.audience-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}
.audience-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.audience-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.audience-card p {
  font-size: 15px;
  margin-bottom: 16px;
}
.audience-card__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-green);
  text-decoration: none;
}
.audience-card__link:hover {
  text-decoration: underline;
}

/* ── Contact form (section 7) ────────────────────────────────────── */
.form-wrap {
  max-width: 520px;
  margin-top: 24px;
}
.form-group {
  margin-bottom: 18px;
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 0.15s;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--c-green);
}
.form-textarea {
  min-height: 120px;
  resize: vertical;
}
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' fill='none' stroke='%235a6470' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}
.form-honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}
.form-submit {
  margin-top: 8px;
}
.form-success {
  padding: 24px 0;
  font-size: 17px;
  color: var(--ink);
  font-weight: 500;
}
.form-error {
  margin-top: 8px;
  font-size: 14px;
  color: #b91c1c;
}

/* ── Footer ─────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 40px;
}
.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--page-px);
}
.footer__about {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.footer__meta {
  display: flex;
  gap: 20px;
  align-items: center;
  font-size: 13px;
  color: var(--ink-faint);
}
.footer__meta a {
  color: var(--ink-faint);
  text-decoration: none;
}
.footer__meta a:hover {
  color: var(--c-green);
}

/* ── Satellite page styles ──────────────────────────────────────── */
.sat-hero {
  padding: 64px 0;
}
.sat-hero h1 {
  font-size: 36px;
  max-width: 560px;
}
.sat-section {
  padding: 48px 0;
}
.sat-section + .sat-section {
  border-top: 1px solid var(--border-soft);
}
.concerns-list {
  margin-top: 20px;
}
.concerns-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-soft);
}
.concerns-list li:last-child { border-bottom: none; }
.concerns-list strong {
  display: block;
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 4px;
}
.concerns-list p {
  font-size: 14px;
  margin-bottom: 0;
}

/* FAQ */
.faq-list {
  margin-top: 20px;
}
.faq-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--border-soft);
}
.faq-item:last-child { border-bottom: none; }
.faq-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}
.faq-item p {
  font-size: 14px;
  margin-bottom: 0;
}

/* Partner bullets */
.partner-bullets {
  margin-top: 16px;
}
.partner-bullets li {
  padding: 12px 0 12px 20px;
  border-left: 2px solid var(--c-green);
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}
.partner-bullets li strong {
  color: var(--ink);
}

/* Worked example */
.worked-example {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 20px;
}
.worked-example p {
  font-size: 15px;
}

/* Privacy page */
.privacy-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px var(--page-px) 96px;
}
.privacy-page h1 {
  font-size: 36px;
  margin-bottom: 8px;
}
.privacy-page .subtitle {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 48px;
}
.privacy-page h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 36px 0 12px;
}
.privacy-page p {
  margin-bottom: 16px;
}
.privacy-page ul {
  margin: 0 0 16px 22px;
  list-style: disc;
}
.privacy-page li {
  margin-bottom: 6px;
  font-size: 16px;
  color: var(--ink-soft);
}
.privacy-page a {
  color: var(--c-green);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.privacy-page a:hover {
  text-decoration-thickness: 2px;
}
.processors-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 16px 0 24px;
}
.processors-box strong { color: var(--ink); }

/* ── Scroll-reveal ──────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Diagram animation ──────────────────────────────────────────── */
.diagram-wrap svg g,
.diagram-wrap svg line {
  opacity: 0;
  transition: opacity 0.3s ease;
}
.diagram-wrap.reveal--visible svg g,
.diagram-wrap.reveal--visible svg line {
  opacity: 1;
}
/* Stagger each stage group */
.diagram-wrap.reveal--visible svg g:nth-child(2)  { transition-delay: 0ms; }
.diagram-wrap.reveal--visible svg line:nth-of-type(1) { transition-delay: 100ms; }
.diagram-wrap.reveal--visible svg g:nth-child(4)  { transition-delay: 200ms; }
.diagram-wrap.reveal--visible svg line:nth-of-type(2) { transition-delay: 300ms; }
.diagram-wrap.reveal--visible svg g:nth-child(6)  { transition-delay: 400ms; }
.diagram-wrap.reveal--visible svg line:nth-of-type(3) { transition-delay: 500ms; }
.diagram-wrap.reveal--visible svg g:nth-child(8)  { transition-delay: 600ms; }
.diagram-wrap.reveal--visible svg line:nth-of-type(4) { transition-delay: 700ms; }
.diagram-wrap.reveal--visible svg g:nth-child(10) { transition-delay: 800ms; }
.diagram-wrap.reveal--visible svg line:nth-of-type(5) { transition-delay: 900ms; }
.diagram-wrap.reveal--visible svg g:nth-child(12) { transition-delay: 1000ms; }
/* Iterations callout last */
.diagram-wrap.reveal--visible svg g:last-child { transition-delay: 1200ms; }

/* ── Mobile (< 720px) ──────────────────────────────────────────── */
@media (max-width: 720px) {
  :root {
    --page-px: 20px;
    --section-py: 64px;
  }
  h1 { font-size: 36px; }
  h2 { font-size: 22px; }

  .nav__links { display: none; }
  .nav__hamburger { display: block; }
  .nav--open .nav__links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px var(--page-px);
    gap: 16px;
  }

  .hero { padding: 48px 0 64px; }

  .principles-grid,
  .usecases-grid {
    grid-template-columns: 1fr;
  }

  .audience-split {
    grid-template-columns: 1fr;
  }

  .hero__ctas .btn {
    width: 100%;
    text-align: center;
  }
}