:root {
  /* Brand colours — Safety Yellow + Charcoal Black */
  --brand-primary:   #FFC300;   /* Safety Yellow */
  --brand-secondary: #1A1A1A;   /* Charcoal Black */
  --brand-ink:       #1A1A1A;   /* Text ink (day) */
  --brand-bg:        #FAFAF7;   /* Paper */
  --brand-surface:   #FFFFFF;   /* Card surface */
  --brand-muted:     #F0EEE6;   /* Muted strip */
  --brand-hairline:  rgba(26,26,26,0.12);

  /* Fonts */
  --font-display: 'Archivo', 'Inter', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Section font sizes (fluid) — anchored to 320px, scaled via vw */
  --fs-display:   clamp(2rem, 5.2vw, 4.5rem);    /* Hero H1  — 32px @320  →  72px @1385+ */
  --fs-h2:        clamp(1.375rem, 2.8vw, 2rem);  /* Section  — 22px @320  →  32px @1143+ — fits "MANUFACTURER" in a col-span-4 grid col */
  --fs-h3:        clamp(1.125rem, 3.2vw, 1.6rem);/* Card     — 18px @320  →  25.6px @800+ */
  --fs-lead:      clamp(1rem, 1.8vw, 1.25rem);   /* Lead paragraph */
  --fs-body:      1rem;
  --fs-eyebrow:   0.75rem;
  --fs-mono:      0.8125rem;
}

/* Form inputs — inherit brand ink in both themes */
.form-field {
  color: var(--brand-ink);
  background: var(--brand-bg);
  border: 1px solid var(--brand-hairline);
}
.form-field:focus { border-color: var(--brand-primary); outline: none; }

/* Social-icon circles — legible on both light and dark footers */
.social-chip {
  background: rgba(255,255,255,0.08);
  color: var(--brand-primary);
  transition: background-color 150ms ease;
}
.social-chip:hover { background: rgba(255,255,255,0.22); }

html, body { background: var(--brand-bg); color: var(--brand-ink); font-family: var(--font-body); }
/* Guard: no horizontal scroll at any viewport */
html, body { overflow-x: clip; }
.font-display { font-family: var(--font-display); font-weight: 800; letter-spacing: -0.02em; }
.font-mono    { font-family: var(--font-mono); }

/* Reviews — use IBM Plex Mono (same face as the eyebrow labels) for quote body */
#reviews blockquote.font-display { font-family: var(--font-mono); font-weight: 500; letter-spacing: 0.02em; }

.h1-display { font-family: var(--font-display); font-weight: 900; font-size: var(--fs-display); line-height: 0.92; letter-spacing: -0.035em; text-transform: uppercase; overflow-wrap: break-word; hyphens: auto; }
.h2-section { font-family: var(--font-display); font-weight: 900; font-size: var(--fs-h2); line-height: 1; letter-spacing: -0.02em; text-transform: uppercase; overflow-wrap: break-word; hyphens: auto; }
.h3-card    { font-family: var(--font-display); font-weight: 800; font-size: var(--fs-h3); line-height: 1.1; letter-spacing: -0.01em; overflow-wrap: break-word; hyphens: auto; }
.eyebrow    { font-family: var(--font-mono); font-size: var(--fs-eyebrow); letter-spacing: 0.18em; text-transform: uppercase; font-weight: 500; }

.hairline { border-color: var(--brand-hairline); }
.surface  { background: var(--brand-surface); border: 1px solid var(--brand-hairline); }

/* Hazard tape band */
.hazard-tape { background: repeating-linear-gradient(45deg, var(--brand-primary) 0 30px, var(--brand-secondary) 30px 60px); }

/* Big section number */
.section-no { font-family: var(--font-mono); font-size: clamp(3rem, 9vw, 7rem); line-height: 1; font-weight: 500; color: var(--brand-primary); -webkit-text-stroke: 1px var(--brand-ink); }

/* Ticker / marquee */
.marquee { display: flex; gap: 2rem; animation: scroll 40s linear infinite; }
@keyframes scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .marquee { animation: none; } html { scroll-behavior: auto; } }

/* Floating mobile bar padding */
@media (max-width: 767px) { main { padding-bottom: 4.75rem; } }

/* Alternating product row */
.product-row > :nth-child(even) { border-left: 1px solid var(--brand-hairline); }
@media (max-width: 767px) { .product-row > :nth-child(even) { border-left: 0; border-top: 1px solid var(--brand-hairline); } }

/* Focus */
:where(a,button,summary,input,textarea,select):focus-visible {
  outline: 2px solid var(--brand-primary); outline-offset: 3px; border-radius: 4px;
}

/* Primary button */
.btn-primary { background: var(--brand-primary); color: var(--brand-secondary); }
.btn-ghost { border: 1px solid var(--brand-hairline); color: var(--brand-ink); }
.btn-ghost:hover { background: var(--brand-muted); }

/* Primary nav links — padded pill that lights up on hover/focus */
.nav-link {
  position: relative;
  padding: 0.5rem 0.75rem;
  border-radius: 2px;
  color: var(--brand-ink);
  transition: background-color 120ms ease, color 120ms ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  background: var(--brand-primary);
  color: var(--brand-secondary);
  outline: none;
}

/* Spec list */
.spec dt { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: color-mix(in oklab, var(--brand-ink) 65%, transparent); }
.spec dd { font-weight: 600; }

.stripe-border { position: relative; }
.stripe-border::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 4px; background: var(--brand-primary); }