/* =============================================================
   THEME C — Corporate Professional
   Restrained, trustworthy, enterprise-grade. Clean Inter throughout
   (no serif), slate + corporate blue, hairline 1px borders, sharp
   corners, denser spacing, all-caps eyebrows with high tracking.
   No decorative ornaments — just structure and data.
   ============================================================= */

html[data-theme="C"] {
  /* --- Palette: white + slate + corporate blue ----------- */
  --paper:        #FFFFFF;
  --paper-soft:   #F8FAFC;
  --paper-deep:   #F1F5F9;
  --hairline:     #E2E8F0;
  --rule:         #CBD5E1;
  --rule-strong:  #94A3B8;

  --ink:          #0F172A;
  --ink-soft:     #334155;
  --ink-mid:      #64748B;
  --ink-faint:    #94A3B8;

  --copper:       #2563EB;
  --copper-soft:  #3B82F6;
  --copper-deep:  #1D4ED8;
  --copper-wash:  rgba(37, 99, 235, 0.06);
  --copper-hair:  rgba(37, 99, 235, 0.20);
  --copper-glow:  rgba(37, 99, 235, 0.03);

  --indigo:       #1E40AF;
  --indigo-soft:  #3B82F6;

  /* --- Type: Inter only --------------------------------- */
  --font-display: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-sans:    "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Tighter spacing — corporate dense */
  --section-pad:  clamp(5rem, 11vh, 8rem);
  --radius:       4px;
}

html[data-theme="C"] body::before { display: none; }

/* --- Display / typography ---------------------------------- */
html[data-theme="C"] .display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
}
html[data-theme="C"] .display em {
  font-style: normal;
  color: var(--copper);
}
html[data-theme="C"] h2.display {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
}

html[data-theme="C"] .eyebrow {
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper);
}
html[data-theme="C"] .eyebrow::before { background: var(--copper); opacity: 1; }

html[data-theme="C"] .lead {
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.3vw, 1.1875rem);
}
html[data-theme="C"] .body { font-size: 1rem; line-height: 1.65; }
html[data-theme="C"] .body strong { color: var(--ink); font-weight: 600; }

/* --- Nav --------------------------------------------------- */
html[data-theme="C"] .nav {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
html[data-theme="C"] .nav.is-scrolled { background: rgba(255, 255, 255, 0.96); }
html[data-theme="C"] .wordmark__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.014em;
}
html[data-theme="C"] .wordmark__glyph { color: var(--copper); }
html[data-theme="C"] .nav__links {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  text-transform: none;
  font-weight: 500;
}

/* --- Hero -------------------------------------------------- */
html[data-theme="C"] .hero { min-height: 88vh; }
html[data-theme="C"] .hero__bg-contours { display: none; }
html[data-theme="C"] .hero__bg-grain {
  background:
    radial-gradient(900px 600px at 100% 0%, rgba(37, 99, 235, 0.05), transparent 60%);
}
html[data-theme="C"] .hero__bg-grid {
  background-image:
    linear-gradient(90deg, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(0deg, rgba(15, 23, 42, 0.025) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px;
}
html[data-theme="C"] .hero__year { color: var(--copper); }
html[data-theme="C"] .hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1;
  font-size: clamp(2.75rem, 8vw, 6.5rem);
  max-width: 14ch;
}
html[data-theme="C"] .hero__title em {
  font-style: normal;
  color: var(--copper);
  font-weight: 700;
}
html[data-theme="C"] .hero__lead {
  font-weight: 400;
  font-size: clamp(1.0625rem, 1.4vw, 1.3125rem);
  color: var(--ink-soft);
}
html[data-theme="C"] .hero__lead strong { color: var(--ink); font-weight: 600; }

/* --- Section heads ----------------------------------------- */
html[data-theme="C"] .section-head .lead { color: var(--ink-soft); }

/* --- Ledger / stats / principles / audiences --------------- */
html[data-theme="C"] .ledger,
html[data-theme="C"] .stats {
  background: var(--paper);
  border-color: var(--hairline);
}
html[data-theme="C"] .ledger__cell:hover,
html[data-theme="C"] .audience:hover { background: var(--paper-soft); }
html[data-theme="C"] .ledger__label {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.012em;
  font-size: clamp(1.125rem, 1.5vw, 1.3125rem);
}
html[data-theme="C"] .ledger__label::before { background: var(--copper); }

html[data-theme="C"] .stats__value { font-family: var(--font-display); font-weight: 700; }
html[data-theme="C"] .stats__num em { font-style: normal; color: var(--copper); }
html[data-theme="C"] .stats__unit { font-weight: 400; }

html[data-theme="C"] .principles__grid { background: var(--paper); }
html[data-theme="C"] .principle { background: var(--paper); }
html[data-theme="C"] .principle:hover { background: var(--paper-soft); }
html[data-theme="C"] .principle::before { background: var(--copper); }
html[data-theme="C"] .principle__title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.014em;
  font-size: clamp(1.25rem, 1.7vw, 1.5rem);
}

html[data-theme="C"] .audience { background: var(--paper); }
html[data-theme="C"] .audience::before { background: var(--copper); }
html[data-theme="C"] .audience h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.012em;
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
}

/* --- Schematic --------------------------------------------- */
html[data-theme="C"] .schematic { background: var(--paper); border-color: var(--hairline); }
html[data-theme="C"] .schematic::before { display: none; }
html[data-theme="C"] .schematic__mark { display: none; }
html[data-theme="C"] .schematic__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}
html[data-theme="C"] .plane__title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.014em;
  font-size: clamp(1.25rem, 1.8vw, 1.625rem);
}
html[data-theme="C"] .plane__sub { font-family: var(--font-body); font-style: normal; font-weight: 500; color: var(--ink); }
html[data-theme="C"] .plane__head::after { background: var(--copper); }

/* --- Service rows ------------------------------------------ */
html[data-theme="C"] .service-row__title h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.018em;
  font-size: clamp(1.25rem, 1.9vw, 1.625rem);
}
html[data-theme="C"] .service-row::before { background: var(--copper); }
html[data-theme="C"] .service-row__tags span {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.75rem;
  border-radius: var(--radius);
  background: var(--paper-soft);
  color: var(--ink-soft);
  letter-spacing: 0.01em;
  text-transform: none;
}

/* --- Foundations / Principles bands ------------------------ */
html[data-theme="C"] .foundations { background: var(--paper-soft); }
html[data-theme="C"] .foundations::before { display: none; }
html[data-theme="C"] .principles { background: var(--paper-soft); }

/* --- Products --------------------------------------------- */
html[data-theme="C"] .product { background: var(--paper); }
html[data-theme="C"] .product:hover { background: var(--paper-soft); }
html[data-theme="C"] .product--live::before { background: var(--copper); }
html[data-theme="C"] .product__name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.022em;
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
}
html[data-theme="C"] .product__pill {
  border-radius: var(--radius);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
html[data-theme="C"] .product__pill--live { border-color: var(--copper); }

/* --- Direction / footer ----------------------------------- */
html[data-theme="C"] .direction__contact a {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.018em;
}
html[data-theme="C"] .footer .wordmark__text { font-family: var(--font-display); font-weight: 700; }
html[data-theme="C"] .opening__pullquote {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.018em;
}
html[data-theme="C"] .opening__pullquote em,
html[data-theme="C"] .foundations__note em,
html[data-theme="C"] .products__note em {
  font-style: normal;
  color: var(--copper);
}
html[data-theme="C"] .foundations__note,
html[data-theme="C"] .products__note {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.014em;
}

/* =============================================================
   Theme C — Dark mode
   ============================================================= */
html[data-theme="C"][data-mode="dark"] {
  --paper:        #0F172A;
  --paper-soft:   #1E293B;
  --paper-deep:   #020617;
  --hairline:     #1E293B;
  --rule:         #334155;
  --rule-strong:  #475569;

  --ink:          #F1F5F9;
  --ink-soft:     #CBD5E1;
  --ink-mid:      #94A3B8;
  --ink-faint:    #64748B;

  --copper:       #60A5FA;
  --copper-soft:  #93C5FD;
  --copper-deep:  #2563EB;
  --copper-wash:  rgba(96, 165, 250, 0.08);
  --copper-hair:  rgba(96, 165, 250, 0.24);
  --copper-glow:  rgba(96, 165, 250, 0.04);
}
html[data-theme="C"][data-mode="dark"] .nav {
  background: rgba(15, 23, 42, 0.86);
  border-bottom-color: var(--hairline);
}
html[data-theme="C"][data-mode="dark"] .nav.is-scrolled { background: rgba(15, 23, 42, 0.94); }
html[data-theme="C"][data-mode="dark"] .hero__bg-grain {
  background:
    radial-gradient(900px 600px at 100% 0%, rgba(96, 165, 250, 0.10), transparent 60%);
}
html[data-theme="C"][data-mode="dark"] .hero__bg-grid {
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
}