/* =========================================================
   Richmond Global Delta — design tokens
   Restrained palette, brand navy + gold used as accent only.
   ========================================================= */

:root {
  /* Brand */
  --brand-navy:        #1f3a93;   /* OG painted royal blue */
  --brand-navy-deep:   #142764;   /* darker variant for headers/footers */
  --brand-gold:        #e5b821;   /* OG painted warm gold (on dark only) */
  --brand-gold-dark:   #b8851f;   /* WCAG-safe gold on light backgrounds */

  /* Neutrals */
  --bg:                #fafaf7;
  --surface:           #ffffff;
  --surface-alt:       #f1f1ec;
  --ink:               #0a1628;   /* near-black with navy tint */
  --ink-muted:         #4b5563;
  --ink-subtle:        #6b7280;
  --border:            #e4e4dd;
  --border-strong:     #c9c9bf;

  /* Focus */
  --focus:             #1e40af;

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Source Serif Pro", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Spacing scale */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;
  --sp-10: 128px;

  /* Layout */
  --container-w: 1180px;
  --container-pad: 28px;

  /* Radii */
  --r-sm: 2px;
  --r-md: 4px;
}

/* =========================================================
   Reset
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--brand-navy);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--brand-navy-deep); }

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--ink);
}

/* =========================================================
   Accessibility helpers
   ========================================================= */

.visually-hidden {
  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;
  left: -9999px;
  top: 0;
  background: var(--brand-navy-deep);
  color: #fff;
  padding: 10px 16px;
  text-decoration: none;
  font-weight: 600;
  z-index: 200;
}
.skip-link:focus { left: 16px; top: 16px; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* =========================================================
   Layout
   ========================================================= */

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* =========================================================
   Brand monogram
   Rendered as an SVG image (assets/logo.svg) so the wedge
   is always the sharp math-conjunction path, never a font glyph.
   ========================================================= */

.monogram {
  display: inline-block;
  width: auto;
  height: 34px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* =========================================================
   Header
   ========================================================= */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--sp-7);
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }
.brand:hover .monogram { opacity: 0.85; }

.wordmark {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: var(--sp-6);
  margin-left: auto;
}
.site-nav a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.005em;
  transition: color 0.15s ease;
}
.site-nav a:hover,
.site-nav a:focus-visible { color: var(--ink); }

.header-cta { white-space: nowrap; }

/* =========================================================
   Buttons
   ========================================================= */

.btn {
  display: inline-block;
  padding: 11px 20px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}
.btn-primary {
  background: var(--brand-navy-deep);
  color: #fff;
  border-color: var(--brand-navy-deep);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: #0c1d4f;
  border-color: #0c1d4f;
}
.btn-secondary {
  background: transparent;
  color: var(--brand-navy-deep);
  border-color: var(--brand-navy-deep);
}
.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--brand-navy-deep);
  color: #fff;
}
.btn-gold {
  background: var(--brand-gold);
  color: var(--brand-navy-deep);
  border-color: var(--brand-gold);
}
.btn-gold:hover,
.btn-gold:focus-visible {
  background: #ffce3a;
  border-color: #ffce3a;
}

/* =========================================================
   Hero
   ========================================================= */

.hero {
  padding: var(--sp-10) 0 var(--sp-9);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 900px; }

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand-gold-dark);
  margin: 0 0 var(--sp-5);
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: -0.022em;
  margin: 0 0 var(--sp-5);
  max-width: 18ch;
  color: var(--ink);
}

.lede {
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-muted);
  max-width: 62ch;
  margin: 0 0 var(--sp-7);
}

.hero-actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-9);
}

.hero-meta {
  list-style: none;
  margin: 0;
  padding: var(--sp-5) 0 0;
  border-top: 1px solid var(--border-strong);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-5);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.hero-meta li::before {
  content: "";
  display: inline-block;
  width: 18px; height: 1px;
  background: var(--brand-gold-dark);
  margin-right: var(--sp-3);
  vertical-align: middle;
}

/* =========================================================
   Sections
   ========================================================= */

.section {
  padding: var(--sp-9) 0;
}
.section-alt { background: var(--surface-alt); }
.section-dark {
  background: var(--brand-navy-deep);
  color: rgba(255,255,255,0.85);
}

.section-eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand-gold-dark);
  margin: 0 0 var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border-strong);
}
.section-eyebrow.on-dark {
  color: var(--brand-gold);
  border-bottom-color: rgba(255,255,255,0.18);
}

.section-headline {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.018em;
  margin: 0 0 var(--sp-7);
  max-width: 32ch;
  color: var(--ink);
}
.section-headline.on-dark { color: #fff; }

.two-col {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: var(--sp-8);
  align-items: start;
}
.two-col .section-headline { margin-bottom: 0; }

.prose p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-muted);
  max-width: 60ch;
  margin: 0 0 var(--sp-4);
}
.prose p:last-child { margin-bottom: 0; }

/* =========================================================
   Grid
   ========================================================= */

.grid { display: grid; gap: var(--sp-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* =========================================================
   Capabilities
   ========================================================= */

.capability {
  padding: var(--sp-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 2px solid var(--brand-navy);
}
.capability-index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--brand-gold-dark);
  margin: 0 0 var(--sp-4);
}
.capability h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 0 0 var(--sp-3);
  letter-spacing: -0.005em;
  line-height: 1.3;
}
.capability p {
  font-size: 15px;
  color: var(--ink-muted);
  margin: 0;
  line-height: 1.6;
}

/* =========================================================
   Methods list
   ========================================================= */

.methods-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-7) var(--sp-8);
  counter-reset: method;
}
.methods-list > li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--sp-4);
  align-items: start;
}
.method-number {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  font-weight: 400;
  color: var(--brand-gold-dark);
  padding-top: 2px;
  border-top: 2px solid var(--brand-gold-dark);
  width: 36px;
  text-align: left;
  padding-right: var(--sp-3);
}
.methods-list h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 var(--sp-2);
}
.methods-list p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* =========================================================
   Domains
   ========================================================= */

.domains { gap: var(--sp-5) var(--sp-6); }
.domain {
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border-strong);
}
.domain h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 var(--sp-3);
  line-height: 1.3;
}
.domain p {
  font-size: 14px;
  color: var(--ink-muted);
  margin: 0;
  line-height: 1.55;
}

/* =========================================================
   Partner cards
   ========================================================= */

.partner-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-5);
}
.partner-card {
  padding: var(--sp-6);
  background: var(--surface);
  border: 1px solid var(--border);
}
.partner-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.01em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--ink-subtle);
}
.partner-card p {
  margin: 0 0 var(--sp-4);
  font-size: 15px;
  color: var(--ink);
  line-height: 1.6;
}
.partner-card p:last-of-type { margin-bottom: var(--sp-4); }

.identifiers {
  margin: 0;
  font-size: 14px;
  display: grid;
  gap: var(--sp-3);
}
.identifiers > div {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--sp-4);
  align-items: baseline;
  padding-bottom: var(--sp-3);
  border-bottom: 1px dashed var(--border);
}
.identifiers > div:last-child { border-bottom: 0; padding-bottom: 0; }
.identifiers dt {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin: 0;
}
.identifiers dd {
  margin: 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.link-arrow {
  display: inline-block;
  color: var(--brand-navy-deep);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  letter-spacing: 0.005em;
}
.link-arrow:hover {
  color: var(--brand-gold-dark);
}
.link-arrow.on-dark { color: var(--brand-gold); }
.link-arrow.on-dark:hover { color: #fff; }

/* =========================================================
   Contact (dark section)
   ========================================================= */

.section-dark .section-headline { color: #fff; }
.contact-grid {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: var(--sp-8);
  align-items: start;
}
.contact-text .lede.on-dark { color: rgba(255,255,255,0.78); }
.contact-direct { margin-top: var(--sp-6); }

.contact-form {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  padding: var(--sp-6);
  border-radius: var(--r-md);
}
.form-row { margin-bottom: var(--sp-5); }
.form-row label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--sp-2);
}
.form-row .req { color: var(--brand-gold); }
.form-row input,
.form-row textarea {
  width: 100%;
  padding: 11px 13px;
  font-size: 15px;
  font-family: inherit;
  background: #fff;
  color: var(--ink);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--r-sm);
}
.form-row input:focus,
.form-row textarea:focus {
  outline: 2px solid var(--brand-gold);
  outline-offset: 0;
  border-color: var(--brand-gold);
}
.form-row textarea { resize: vertical; min-height: 120px; }
.form-note {
  margin: var(--sp-4) 0 0;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}
.form-note a { color: var(--brand-gold); }
.form-note a:hover { color: #fff; }

/* =========================================================
   Footer
   ========================================================= */

.site-footer {
  background: var(--brand-navy-deep);
  color: rgba(255,255,255,0.7);
  padding: var(--sp-7) 0;
  font-size: 14px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-4);
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  color: #fff;
}
.footer-monogram { height: 28px; }
.footer-wordmark { font-weight: 500; letter-spacing: 0.01em; }
.footer-wordmark .sep { color: rgba(255,255,255,0.45); margin: 0 6px; }
.footer-meta { margin: 0; color: rgba(255,255,255,0.55); }

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 960px) {
  .two-col { grid-template-columns: 1fr; gap: var(--sp-5); }
  .contact-grid { grid-template-columns: 1fr; gap: var(--sp-6); }
  .partner-grid { grid-template-columns: 1fr; }
  .methods-list { grid-template-columns: 1fr; gap: var(--sp-6); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  :root { --container-pad: 20px; }
  .header-inner {
    flex-wrap: wrap;
    gap: var(--sp-3);
    padding-top: 14px;
    padding-bottom: 14px;
  }
  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    margin-top: var(--sp-3);
    padding-top: var(--sp-3);
    gap: var(--sp-5);
    border-top: 1px solid var(--border);
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .header-cta { margin-left: auto; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: var(--sp-8) 0 var(--sp-7); }
  .section { padding: var(--sp-8) 0; }
  .hero h1 { max-width: none; }
  .wordmark { font-size: 14px; }
  .monogram { height: 28px; }
}

@media (max-width: 500px) {
  .grid-4 { grid-template-columns: 1fr; }
  .hero-meta { grid-template-columns: 1fr; gap: var(--sp-3); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* =========================================================
   Reduced motion
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* =========================================================
   Print
   ========================================================= */

@media print {
  .site-header, .header-cta, .hero-actions, .contact-form, .footer-meta { display: none; }
  .section-dark { background: #fff; color: #000; }
  .section-dark .section-headline, .lede.on-dark, .link-arrow.on-dark { color: #000; }
  .section { padding: 24pt 0; page-break-inside: avoid; }
}