/* ================================================================
   MINT DESIGN SYSTEM — styles.css
   Shared stylesheet for all pages.
   Target: Blue Owl Capital × Stripe Docs × Virgil Abloh minimalism
   ================================================================ */

/* ----------------------------------------------------------------
   FONTS
   ---------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:wght@400;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ----------------------------------------------------------------
   CSS CUSTOM PROPERTIES
   ---------------------------------------------------------------- */
:root {
  /* Backgrounds */
  --bg-primary: #FFFFFF;
  --bg-alt: #FAFAF8;
  --bg-dark: #0B0D11;

  /* Text */
  --text-primary: #0B0D11;
  --text-secondary: #3B4046;
  --text-tertiary: #6B7280;

  /* Accent */
  --mint: #0D7377;

  /* Borders */
  --border: #E5E7EB;

  /* Fonts */
  --font-sans: 'Inter', -apple-system, system-ui, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Layout */
  --max-width: 1200px;
  --padding-desktop: 80px;
  --padding-mobile: 24px;
  --section-gap: 120px;

  /* Fibonacci spacing */
  --space-1: 8px;
  --space-2: 13px;
  --space-3: 21px;
  --space-4: 34px;
  --space-5: 55px;
  --space-6: 89px;
}

/* ----------------------------------------------------------------
   RESET
   ---------------------------------------------------------------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Force zero border-radius globally */
*,
*::before,
*::after {
  border-radius: 0 !important;
}

/* ----------------------------------------------------------------
   TYPOGRAPHY SCALE
   ---------------------------------------------------------------- */

/* Hero headline — 56px+ desktop */
.t-hero {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.6vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* Section title — 32px */
.t-section {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

/* Body — 16px */
.t-body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* Caption — 13px */
.t-caption {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-tertiary);
}

/* Overline / label */
.t-overline {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* Mono — data / code */
.t-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

/* ----------------------------------------------------------------
   LAYOUT
   ---------------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--padding-desktop);
  padding-right: var(--padding-desktop);
}

/* 12-column grid */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-3);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
}

/* Section vertical spacing */
.section-spacing {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

/* Alternating section backgrounds */
.bg-white {
  background: var(--bg-primary);
}

.bg-alt {
  background: var(--bg-alt);
}

/* ----------------------------------------------------------------
   NAV (.site-nav)
   ---------------------------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--padding-desktop);
  background: var(--bg-primary);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.site-nav.scrolled {
  border-bottom-color: var(--border);
}

.site-nav-wordmark {
  font-family: var(--font-sans);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
}

.site-nav-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
}

.site-nav-links a {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
}

.site-nav-links a:hover {
  color: var(--text-primary);
}

.site-nav-links a.active {
  color: var(--text-primary);
}

.site-nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--mint);
}

/* Hamburger (hidden on desktop) */
.site-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
}

.site-nav-toggle span {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ----------------------------------------------------------------
   SECTION HEADER (.section-header)
   ---------------------------------------------------------------- */
.section-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.section-header-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--mint);
}

.section-header-title {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

/* ----------------------------------------------------------------
   METRIC CARD (.metric-card)
   ---------------------------------------------------------------- */
.metric-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  padding: var(--space-4) var(--space-4);
}

.metric-card-value {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-1);
}

.metric-card-label {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* Grid layouts for metric cards */
.metric-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.metric-grid-3 .metric-card {
  border: none;
}

.metric-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.metric-grid-4 .metric-card {
  border: none;
}

/* ----------------------------------------------------------------
   DATA TABLE (.data-table)
   ---------------------------------------------------------------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
}

.data-table thead th {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  text-align: left;
  padding: 12px;
  border-bottom: 0.5px solid var(--border);
}

.data-table thead th[data-align="right"] {
  text-align: right;
}

.data-table tbody tr {
  border-bottom: 0.5px solid var(--border);
  transition: background 0.15s ease;
}

.data-table tbody tr:nth-child(even) {
  background: var(--bg-alt);
}

.data-table tbody tr:nth-child(odd) {
  background: var(--bg-primary);
}

.data-table tbody tr:last-child {
  border-bottom: none;
}

.data-table tbody td {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  padding: 12px;
}

.data-table tbody td[data-align="right"] {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.data-table tbody tr:hover {
  background: var(--bg-alt);
}

/* ----------------------------------------------------------------
   PROCESS FLOW (.process-flow)
   ---------------------------------------------------------------- */
.process-flow {
  display: flex;
  align-items: center;
  gap: 0;
}

.process-flow-node {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  background: var(--bg-primary);
}

.process-flow-node-label {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.process-flow-connector {
  width: 48px;
  height: 1px;
  background: var(--border);
  flex-shrink: 0;
}

/* ----------------------------------------------------------------
   PULL QUOTE (.pull-quote)
   ---------------------------------------------------------------- */
.pull-quote {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.45;
  color: var(--text-primary);
  text-align: center;
  padding: var(--space-4) 0;
  margin: var(--space-3) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
}

/* ----------------------------------------------------------------
   CTAs (.cta-link, .cta-primary)
   ---------------------------------------------------------------- */

/* Text link CTA */
.cta-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.cta-link:hover {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

/* Primary CTA button — max 1 per page */
.cta-primary {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--bg-primary);
  background: var(--text-primary);
  padding: 16px 40px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.cta-primary:hover {
  background: var(--bg-dark);
}

/* ----------------------------------------------------------------
   DARK SECTION (.section-dark)
   Max once per page.
   ---------------------------------------------------------------- */
.section-dark {
  background: var(--bg-dark);
  color: var(--bg-primary);
}

.section-dark .t-hero,
.section-dark .t-section,
.section-dark .section-header-title {
  color: var(--bg-primary);
}

.section-dark .t-body {
  color: #A1A1AA;
}

.section-dark .t-caption,
.section-dark .t-overline,
.section-dark .section-header-num {
  color: #6B7280;
}

.section-dark .metric-card {
  background: var(--bg-dark);
  border-color: rgba(255, 255, 255, 0.1);
}

.section-dark .metric-card-value {
  color: var(--bg-primary);
}

.section-dark .metric-card-label {
  color: #6B7280;
}

.section-dark .pull-quote {
  color: var(--bg-primary);
  border-color: rgba(255, 255, 255, 0.1);
}

.section-dark .data-table thead th {
  color: #6B7280;
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.section-dark .data-table tbody tr {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.section-dark .data-table tbody td {
  color: #A1A1AA;
}

.section-dark .data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.section-dark .data-table tbody tr:nth-child(odd) {
  background: transparent;
}

/* ----------------------------------------------------------------
   FOOTER (.site-footer)
   ---------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) var(--padding-desktop);
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.site-footer-wordmark {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
}

.site-footer-links {
  display: flex;
  gap: var(--space-4);
}

.site-footer-links a {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer-links a:hover {
  color: var(--text-primary);
}

.site-footer-copy {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-tertiary);
  justify-self: end;
}

.site-footer-sub {
  text-align: center;
  padding-top: var(--space-4);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
}

/* ----------------------------------------------------------------
   SCROLL ANIMATIONS (.ao)
   Fade-in on scroll via Intersection Observer.
   JS adds .vis class when element enters viewport.
   ---------------------------------------------------------------- */
.ao {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.ao.vis {
  opacity: 1;
  transform: translateY(0);
}

/* ----------------------------------------------------------------
   UTILITY CLASSES
   ---------------------------------------------------------------- */
.text-mint {
  color: var(--mint);
}

.border-bottom {
  border-bottom: 1px solid var(--border);
}

.border-top {
  border-top: 1px solid var(--border);
}

.max-w-narrow {
  max-width: 720px;
}

.max-w-content {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* ----------------------------------------------------------------
   RESPONSIVE — Tablet (768px)
   ---------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --padding-desktop: 24px;
    --section-gap: 80px;
  }

  /* Nav: keep visible on mobile */
  .site-nav {
    padding: var(--space-2) var(--padding-mobile);
  }

  .site-nav-links {
    display: flex;
    gap: var(--space-3);
  }

  .site-nav-links a {
    font-size: 12px;
  }

  /* Typography scale down */
  .t-hero {
    font-size: clamp(32px, 8vw, 48px);
  }

  .t-section,
  .section-header-title {
    font-size: 24px;
  }

  .pull-quote {
    font-size: 22px;
  }

  /* Grids: 4-col -> 2-col */
  .metric-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  /* Footer responsive */
  .site-footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    text-align: center;
    justify-items: center;
  }

  .site-footer-copy {
    justify-self: center;
  }

  .site-footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
  }
}

/* ----------------------------------------------------------------
   RESPONSIVE — Mobile (375px)
   ---------------------------------------------------------------- */
@media (max-width: 375px) {
  /* Card grids: 2-col -> 1-col */
  .metric-grid-4,
  .metric-grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-4,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .metric-card-value {
    font-size: 28px;
  }

  .cta-primary {
    width: 100%;
    text-align: center;
  }
}