/*
 * ChainVision shared styles
 * Design tokens, base type, shared components.
 * Page-specific styles live in each page's <style> block.
 */

:root {
  /* Backgrounds & surfaces */
  --bg-primary: #FAFAFA;
  --bg-tinted: #F2F0EC;
  --bg-card: #FFFFFF;
  --bg-dark: #1A1A1A;
  --border: #E8E6E1;

  /* Text */
  --text-primary: #1A1A1A;
  --text-secondary: #5A5A5A;
  --text-tertiary: #888888;
  --text-inverse: #FAFAFA;

  /* Brand */
  --accent-primary: #2C4A3E;
  --accent-primary-hover: #1F3329;
  --accent-warm: #B8624C;
  --accent-primary-pale: rgba(44, 74, 62, 0.08);
  --accent-primary-fill: rgba(44, 74, 62, 0.15);

  /* Chart */
  --chart-data-1: #2C4A3E;
  --chart-data-2: #5A5A5A;
  --chart-data-3: #B8624C;
  --chart-grid: #EFEFEF;

  /* Type */
  --font-body: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-display: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  /* Spacing */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  /* Container */
  --container-max: 1280px;
  --container-narrow: 720px;
  --container-medium: 1024px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Border */
  --border-default: 1px solid var(--border);

  /* Shadows */
  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.07);

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-medium: 300ms ease-out;
  --transition-slow: 600ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-medium: 0ms;
    --transition-slow: 0ms;
  }
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: 'tnum' 1, 'lnum' 1;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2);
  background: var(--accent-primary);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: var(--space-2); }

/* Focus state — visible for keyboard users only */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Type */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(36px, 6vw, 72px); font-weight: 700; line-height: 1.1; }
h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 600; line-height: 1.15; }
h3 { font-size: clamp(20px, 2.4vw, 28px); font-weight: 600; line-height: 1.2; }
h4 { font-size: clamp(18px, 2vw, 22px); font-weight: 600; line-height: 1.25; }
p  { color: var(--text-secondary); }

/* Mono utility for numbers, axis labels, technical specs */
.mono { font-family: var(--font-mono); font-feature-settings: 'tnum' 1; }

/* Small uppercase labels */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-warm);
  display: inline-block;
}

/* Container */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-4); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-4); }
.container-medium { max-width: var(--container-medium); margin: 0 auto; padding: 0 var(--space-4); }
@media (max-width: 768px) {
  .container, .container-narrow, .container-medium { padding: 0 var(--space-3); }
}

/* Sections */
.section {
  padding: var(--space-7) 0;
}
.section-large { padding: var(--space-8) 0; }
.section-tinted { background: var(--bg-tinted); }
.section-dark { background: var(--bg-dark); color: var(--text-inverse); }
@media (max-width: 768px) {
  .section, .section-large { padding: var(--space-6) 0; }
}

/* Section header pattern */
.section-header { margin-bottom: var(--space-5); }
.section-header .eyebrow { margin-bottom: var(--space-2); }
.section-header h2 { margin-bottom: var(--space-2); }
.section-header .lead {
  font-size: 18px;
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 640px;
}
@media (min-width: 768px) {
  .section-header .lead { font-size: 20px; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-primary);
  color: var(--text-inverse);
}
.btn-primary:hover { background: var(--accent-primary-hover); }
.btn-secondary {
  background: transparent;
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}
.btn-secondary:hover { background: var(--accent-primary-pale); }
.btn-text {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--accent-primary);
  font-weight: 500;
}
.btn-text .arrow { transition: color var(--transition-fast), transform var(--transition-fast); }
.btn-text:hover .arrow { color: var(--accent-warm); transform: translateX(2px); }

/* Cards */
.card {
  background: var(--bg-card);
  border: var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
@media (max-width: 768px) {
  .card { padding: var(--space-3); }
}
.section-tinted .card { background: var(--bg-card); }

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.table th, .table td {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
}
.table th {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 14px;
}
.table td.numeric, .table th.numeric {
  text-align: right;
  font-family: var(--font-mono);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.site-header.is-scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-subtle);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}
.brand .brand-product { color: var(--accent-primary); }
.nav-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent-primary); }
.nav-lock {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--accent-warm);
  border: 1px solid rgba(184, 98, 76, 0.4);
  border-radius: 2px;
  vertical-align: 1px;
  text-transform: uppercase;
}
.nav-cta {
  margin-left: var(--space-2);
}

/* Mobile nav */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text-primary);
  position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 22px; height: 1.5px;
  background: var(--text-primary);
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

@media (max-width: 768px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3);
    transform: translateY(-100%);
    transition: transform var(--transition-medium);
  }
  .nav-links.is-open { transform: translateY(0); }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: var(--space-2) 0;
    font-size: 16px;
  }
  .nav-cta { margin-left: 0; margin-top: var(--space-2); }
}

/* Footer */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-inverse);
  padding: var(--space-7) 0 var(--space-5);
}
.site-footer .container { padding: 0 var(--space-4); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-4); }
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(250, 250, 250, 0.5);
  margin-bottom: var(--space-3);
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a {
  color: rgba(250, 250, 250, 0.75);
  font-size: 14px;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--accent-warm); }
.footer-brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-inverse);
  margin-bottom: var(--space-2);
}
.footer-brand .brand-product { color: rgba(250, 250, 250, 0.6); font-weight: 400; }
.footer-tagline {
  color: rgba(250, 250, 250, 0.6);
  font-size: 14px;
  line-height: 1.6;
  max-width: 320px;
}
.footer-bottom {
  border-top: 1px solid rgba(250, 250, 250, 0.1);
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(250, 250, 250, 0.5);
}

/* Animation utilities */
[data-animate] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-animate-delay="1"] { transition-delay: 100ms; }
[data-animate-delay="2"] { transition-delay: 200ms; }
[data-animate-delay="3"] { transition-delay: 300ms; }
@media (prefers-reduced-motion: reduce) {
  [data-animate] { opacity: 1; transform: none; transition: none; }
}

/* NDA banner (gated pages) */
.nda-banner {
  background: rgba(184, 98, 76, 0.06);
  border-top: 1px solid rgba(184, 98, 76, 0.18);
  border-bottom: 1px solid rgba(184, 98, 76, 0.18);
  padding: var(--space-3) var(--space-4);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-warm);
  line-height: 1.6;
  letter-spacing: 0.02em;
}