/* ================================================================
   RidgeCTX — global stylesheet
   Design system: deep navy grounds, Signal Gold accent, Federal Blue
   reserved for data, Spectral (serif/voice) + Public Sans (sans/reading)
   + Spline Sans Mono (labels/code). Self-hosted fonts, real logo assets.
   ================================================================ */

/* ── Webfonts (self-hosted, OFL) ──────────────────────────────── */
@font-face { font-family:'Spectral'; font-style:normal; font-weight:400; font-display:swap; src:url('assets/fonts/Spectral-Regular.ttf') format('truetype'); }
@font-face { font-family:'Spectral'; font-style:italic; font-weight:400; font-display:swap; src:url('assets/fonts/Spectral-Italic.ttf') format('truetype'); }
@font-face { font-family:'Spectral'; font-style:normal; font-weight:500; font-display:swap; src:url('assets/fonts/Spectral-Medium.ttf') format('truetype'); }
@font-face { font-family:'Spectral'; font-style:italic; font-weight:500; font-display:swap; src:url('assets/fonts/Spectral-MediumItalic.ttf') format('truetype'); }
@font-face { font-family:'Spectral'; font-style:normal; font-weight:600; font-display:swap; src:url('assets/fonts/Spectral-SemiBold.ttf') format('truetype'); }
@font-face { font-family:'Public Sans'; font-style:normal; font-weight:100 900; font-display:swap; src:url('assets/fonts/PublicSans-Variable.ttf') format('truetype-variations'); }
@font-face { font-family:'Public Sans'; font-style:italic; font-weight:100 900; font-display:swap; src:url('assets/fonts/PublicSans-Italic-Variable.ttf') format('truetype-variations'); }
@font-face { font-family:'Spline Sans Mono'; font-style:normal; font-weight:300 700; font-display:swap; src:url('assets/fonts/SplineSansMono-Variable.ttf') format('truetype-variations'); }

/* ── Tokens ────────────────────────────────────────────────────── */
:root {
  /* Core grounds */
  --navy: #0F1F3D;
  --navy-elevated: #1D2C48;

  /* Accents */
  --signal-gold: #E8A838;
  --gold-on-light: #C8941F;
  --federal-blue: #2D6BB5;

  /* Neutrals */
  --white: #FFFFFF;
  --off-white: #FCF8FF;
  --mist-gray: #F3F4F5;
  --pale-blue: #F7F9FC;
  --slate: #ACBFDA;

  --ink: #0F1F3D;
  --ink-body: #3D4F6A;
  --ink-muted: #818C9E;

  --line-on-light: rgba(15, 31, 61, 0.08);
  --line-on-light-strong: rgba(15, 31, 61, 0.12);
  --line-on-navy: rgba(172, 191, 218, 0.35);

  /* Semantic */
  --surface-page: var(--pale-blue);
  --surface-card: var(--white);
  --surface-inset: var(--mist-gray);
  --surface-dark: var(--navy);
  --surface-dark-elevated: var(--navy-elevated);

  --text-heading: var(--ink);
  --text-body: var(--ink-body);
  --text-muted: var(--ink-muted);
  --text-link: var(--federal-blue);
  --text-data: var(--federal-blue);
  --text-emphasis: var(--gold-on-light);

  --text-on-dark: var(--white);
  --text-on-dark-muted: var(--slate);
  --text-on-dark-emphasis: var(--signal-gold);

  --border-card: var(--line-on-light);
  --border-strong: var(--line-on-light-strong);

  /* Type */
  --font-serif: 'Spectral', Georgia, 'Times New Roman', serif;
  --font-sans: 'Public Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'Spline Sans Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --size-display: 68px;
  --size-h2: 48px;
  --size-h3: 24px;
  --size-stat: 40px;
  --size-quote: 22px;
  --size-lead: 18px;
  --size-body: 16px;
  --size-ui: 15px;
  --size-eyebrow: 12px;
  --size-caption: 13px;

  /* Layout */
  --container-max: 1080px;
  --container-pad: 56px;

  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 14px;

  --shadow-card: 0 1px 2px rgba(15, 31, 61, 0.04);
  --shadow-raised: 0 4px 16px rgba(15, 31, 61, 0.08);
  --rule-width: 32px;
}

/* ── Reset & base ─────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink-body);
  background: var(--surface-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text-link); text-decoration: none; }
a:hover { color: var(--navy); }
img { display: block; max-width: 100%; }

/* ── Layout helpers ───────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

section { padding: 88px 0; }

/* Rule-label eyebrow: 32px gold hairline + tracked uppercase label */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.eyebrow::before {
  content: '';
  height: 1px;
  width: var(--rule-width);
  background: var(--gold-on-light);
  display: inline-block;
  flex: none;
}

.eyebrow span {
  font-size: var(--size-eyebrow);
  font-weight: 600;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: var(--gold-on-light);
}

.eyebrow.on-dark::before { background: var(--signal-gold); }
.eyebrow.on-dark span { color: var(--signal-gold); }

.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2rem, 3.4vw, var(--size-h2));
  letter-spacing: -0.3px;
  color: var(--text-heading);
  line-height: 1.15;
  margin-bottom: 20px;
}

.section-title em {
  font-style: normal;
  color: var(--text-emphasis);
}

.section-sub {
  font-size: var(--size-lead);
  color: var(--text-body);
  max-width: 640px;
  line-height: 1.6;
}

/* ── Nav ──────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--navy);
  border-bottom: 1px solid var(--line-on-navy);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img { height: 32px; display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
}

.nav-links a {
  font-size: var(--size-ui);
  font-weight: 500;
  color: var(--slate);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--white); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--signal-gold) !important;
  color: var(--navy) !important;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--size-ui) !important;
  transition: transform 0.12s ease !important;
}

.nav-cta:hover { transform: scale(1.02); }

/* ── Ridge motif (topographic contour lines + blueprint grid) ─── */
.ridge-motif {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.ridge-motif .grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(172,191,218,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(172,191,218,.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

.ridge-motif svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.8;
}

/* ── Buttons ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: var(--size-ui);
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--signal-gold);
  color: var(--navy);
}

.btn-primary:hover { background: #F0B840; color: var(--navy); }

.btn-ghost {
  background: transparent;
  border-color: var(--line-on-navy);
  color: var(--white);
}

.btn-ghost:hover { border-color: rgba(255,255,255,0.7); color: var(--white); }

/* ── Hero ─────────────────────────────────────── */
#hero {
  padding-top: 172px;
  padding-bottom: 0;
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad) 88px;
  position: relative;
}

.hero-text { max-width: 880px; }

.hero-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 5vw, var(--size-display));
  letter-spacing: -0.5px;
  color: var(--white);
  line-height: 1.08;
  margin-bottom: 22px;
}

.hero-title em {
  font-style: normal;
  color: var(--signal-gold);
}

.hero-sub {
  font-size: var(--size-lead);
  color: var(--slate);
  line-height: 1.6;
  max-width: 620px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 72px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-on-navy);
  border: 1px solid var(--line-on-navy);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-card {
  background: var(--navy);
  padding: 26px 28px;
}

.stat-num {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--size-stat);
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 14px;
  color: var(--slate);
  line-height: 1.5;
}

/* ── Problem ──────────────────────────────────── */
#problem { background: var(--surface-page); }

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
  margin-top: 3rem;
}

.problem-quote {
  border-left: 3px solid var(--signal-gold);
  padding-left: 1.5rem;
  margin-bottom: 2rem;
}

.problem-quote blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--size-quote);
  color: var(--ink);
  line-height: 1.45;
  margin-bottom: 0.6rem;
}

.problem-quote cite {
  font-size: var(--size-caption);
  color: var(--ink-muted);
  font-style: normal;
}

.problem-facts {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.fact-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.1rem 1.3rem;
  background: var(--mist-gray);
  border-left: 3px solid var(--signal-gold);
  border-radius: var(--radius-sm);
}

.fact-num {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.7rem;
  color: var(--federal-blue);
  line-height: 1.1;
  white-space: nowrap;
  width: 130px;
  flex-shrink: 0;
}

.fact-text {
  font-size: 14.5px;
  color: var(--ink-body);
  line-height: 1.5;
}

.fact-text strong {
  display: block;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

/* ── Approach ─────────────────────────────────── */
#approach {
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

.approach-header {
  max-width: 640px;
  margin-bottom: 3rem;
  position: relative;
}

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  position: relative;
}

.pillar {
  background: var(--navy-elevated);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.2s;
}

.pillar:hover { transform: translateY(-2px); }

.pillar-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--signal-gold);
  margin-bottom: 1rem;
}

.pillar-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--size-h3);
  color: var(--white);
  margin-bottom: 0.75rem;
}

.pillar-body {
  font-size: 15px;
  color: var(--slate);
  line-height: 1.65;
}

/* ── AI Stats band ────────────────────────────── */
#stats {
  background: var(--navy-elevated);
  padding: 4rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stats-item { padding: 0.5rem; }

.stats-num {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2.4rem;
  color: var(--white);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stats-num span { color: var(--signal-gold); }

.stats-label {
  font-size: 13px;
  color: var(--slate);
  line-height: 1.4;
}

.stats-divider {
  width: 1px;
  background: var(--line-on-navy);
  align-self: stretch;
}

.stats-source {
  text-align: center;
  margin-top: 2rem;
  font-size: 12px;
  color: var(--slate);
  opacity: 0.6;
}

/* ── Difference ────────────────────────────────── */
#difference { background: var(--surface-page); }

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 3rem;
}

.diff-col-label {
  font-size: var(--size-eyebrow);
  font-weight: 600;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid;
}

.diff-col-label.incumbent { color: var(--ink-muted); border-color: var(--line-on-light-strong); }
.diff-col-label.ridgectx  { color: var(--gold-on-light); border-color: var(--signal-gold); }

.diff-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line-on-light);
  font-size: 14.5px;
}

.diff-item:last-child { border-bottom: none; }

.diff-icon {
  margin-top: 2px;
  font-size: 14px;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.diff-item.neg .diff-icon { color: var(--ink-muted); }
.diff-item.neg .diff-text { color: var(--ink-muted); }
.diff-item.pos .diff-icon { color: var(--federal-blue); }
.diff-item.pos .diff-text { color: var(--ink); font-weight: 500; }

/* ── Contact / CTA ────────────────────────────── */
#contact { background: var(--surface-page); }

.contact-inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.contact-inner .eyebrow { justify-content: center; }
.contact-inner .section-title { margin-bottom: 1rem; }
.contact-inner .section-sub { margin: 0 auto 2rem; text-align: left; }

.contact-card {
  background: var(--navy);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  text-align: left;
}

.contact-card p {
  color: var(--slate);
  font-size: 15px;
  margin-bottom: 1.75rem;
  line-height: 1.65;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--signal-gold);
  color: var(--navy);
  font-weight: 700;
  font-size: var(--size-ui);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.contact-link:hover { background: #F0B840; color: var(--navy); }

.contact-note {
  margin-top: 1.25rem;
  font-size: 12px;
  color: var(--slate);
  opacity: 0.65;
}

/* ── Footer ───────────────────────────────────── */
footer {
  background: var(--navy);
  border-top: 1px solid var(--line-on-navy);
  padding: 2.5rem 0;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-logo img { height: 24px; display: block; }

.footer-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 800px) {
  .hero-inner,
  .problem-grid,
  .diff-grid { grid-template-columns: 1fr; gap: 2.5rem; }

  .pillar-grid,
  .stats-grid,
  .hero-stats { grid-template-columns: 1fr; }

  .stats-divider { display: none; }

  .nav-links li:not(.nav-cta-item) { display: none; }

  section { padding: 3.5rem 0; }

  #hero { padding-top: 140px; }
}