/* ==========================================================================
   Pyek AI — Global Styles
   Design tokens, reset, typography, layout utilities
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Brand palette */
  --color-ink: #0B2945;          /* Deep navy — primary brand */
  --color-ink-2: #1E3A5F;        /* Secondary navy */
  --color-accent: #06B6D4;       /* Cyan — AI accent */
  --color-accent-dark: #0891B2;  /* Cyan pressed */
  --color-accent-warm: #F59E0B;  /* Amber — warm CTA */

  /* Neutrals */
  --color-text: #0F172A;
  --color-text-muted: #475569;
  --color-text-subtle: #64748B;
  --color-border: #E2E8F0;
  --color-border-strong: #CBD5E1;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-bg-dark: #0B2945;
  --color-bg-card: #FFFFFF;

  /* Semantic */
  --color-success: #059669;
  --color-focus: #06B6D4;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* Scale */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 1.875rem;
  --fs-3xl: 2.25rem;
  --fs-4xl: 3rem;
  --fs-5xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radii */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 880px;
  --nav-height: 72px;
  --transition: 180ms ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; }
a { color: var(--color-ink); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-dark); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--space-12) 0; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--color-ink);
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.25rem, 4vw, var(--fs-5xl)); font-weight: 800; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.75rem, 3vw, var(--fs-3xl)); font-weight: 700; }
h3 { font-size: var(--fs-xl); font-weight: 700; }
h4 { font-size: var(--fs-lg); font-weight: 600; }
h5 { font-size: var(--fs-md); font-weight: 600; }
h6 { font-size: var(--fs-base); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); }

p { margin: 0 0 var(--space-4); color: var(--color-text); }
.lead { font-size: var(--fs-lg); color: var(--color-text-muted); line-height: 1.55; }
small, .small { font-size: var(--fs-sm); color: var(--color-text-muted); }

strong, b { font-weight: 700; color: var(--color-ink); }
em, i { font-style: italic; }

ul, ol { margin: 0 0 var(--space-4); padding-left: var(--space-6); }
ul li, ol li { margin-bottom: var(--space-2); }

blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-6);
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  font-style: italic;
  color: var(--color-text-muted);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  background: var(--color-bg-alt);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}

/* ---------- Layout containers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
@media (min-width: 768px) {
  .container, .container-narrow { padding: 0 var(--space-8); }
}

/* Section spacing */
.section { padding: var(--space-16) 0; }
.section-sm { padding: var(--space-12) 0; }
.section-lg { padding: var(--space-20) 0; }
@media (min-width: 768px) {
  .section { padding: var(--space-20) 0; }
  .section-sm { padding: var(--space-16) 0; }
  .section-lg { padding: var(--space-24) 0; }
}

.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-ink); color: #fff; }
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
.section-dark p { color: #CBD5E1; }

/* ---------- Grid utilities ---------- */
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Flex utilities ---------- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* ---------- Text utilities ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-muted { color: var(--color-text-muted); }
.text-subtle { color: var(--color-text-subtle); }
.text-accent { color: var(--color-accent-dark); }
.text-white { color: #fff; }
.eyebrow {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-3);
}
.section-dark .eyebrow { color: var(--color-accent); }

/* ---------- Spacing utilities ---------- */
.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* ---------- Accessibility ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; top: -40px; left: 8px;
  background: var(--color-ink); color: #fff;
  padding: 8px 12px; z-index: 9999; border-radius: var(--radius);
  transition: top var(--transition);
}
.skip-link:focus { top: 8px; color: #fff; }

/* ---------- Print ---------- */
@media print {
  nav, footer, .no-print { display: none !important; }
  body { color: #000; background: #fff; }
}