/* ============================================================
   MeasureIt.net — Design System
   Blueprint palette: Navy #0F2B45 | Orange #E8642C
   Fonts: Fraunces (display) · Plus Jakarta Sans (UI) · JetBrains Mono (data)
   ============================================================ */

/* ── CSS Variables ──────────────────────────────────────────── */
:root {
  /* Brand */
  --navy:           #0F2B45;
  --navy-mid:       #1A3D5C;
  --navy-light:     #2A5478;
  --navy-wash:      #F0F4F8;
  --orange:         #E8642C;
  --orange-dark:    #C9501E;
  --orange-light:   #FEF3ED;

  /* Blueprint grid */
  --grid-line:       rgba(15, 43, 69, 0.06);
  --grid-line-strong:rgba(15, 43, 69, 0.12);

  /* Neutrals */
  --white:          #FFFFFF;
  --paper:          #F6F7F9;
  --border:         #E2E5EA;
  --border-strong:  #CDD2D9;

  /* Ink */
  --ink:            #0F1A26;
  --ink-mid:        #3A4450;
  --ink-light:      #6B7685;
  --ink-muted:      #9AA3AE;

  /* Semantic */
  --green:          #5DE4A0;
  --error:          #C0392B;
  --error-bg:       rgba(192, 57, 43, 0.1);

  /* Layout */
  --max-width:      1000px;
  --content-width:  720px;
  --calc-width:     760px;
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      12px;
  --radius-xl:      16px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
}

/* ── Accessibility ──────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--navy);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  z-index: 1000;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  top: 0;
}

:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 2px;
  border-radius: 2px;
}
:focus:not(:focus-visible) {
  outline: none;
}

/* ── Blueprint grid background ──────────────────────────────── */
.blueprint-bg {
  background-color: var(--white);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(var(--grid-line-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-strong) 1px, transparent 1px);
  background-size:
    20px 20px,
    20px 20px,
    100px 100px,
    100px 100px;
}

/* ── Container ──────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav {
  padding: 0 24px;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-text {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.75px;
  color: var(--navy);
  line-height: 1;
}
.logo-dot { color: var(--orange); }

/* Nav links */
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink-light);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
.nav-links a:hover {
  color: var(--navy);
  background: var(--navy-wash);
}
.nav-links a[aria-current="page"] {
  color: var(--navy);
  background: var(--navy-wash);
}
.nav-cta {
  background: var(--navy) !important;
  color: var(--white) !important;
  margin-left: 8px;
  border-radius: var(--radius-sm) !important;
}
.nav-cta:hover {
  background: var(--navy-mid) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.45);
  padding: 56px 24px 0;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  position: relative;
}

.footer-brand {
  max-width: 320px;
}
.footer-logo .logo-text { color: var(--white); }
.footer-brand p {
  font-size: 14px;
  line-height: 1.65;
  margin-top: 12px;
}

.footer-links {
  display: flex;
  gap: 56px;
}
.footer-col-heading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: rgba(255, 255, 255, 0.25);
  margin-bottom: 16px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding: 24px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  color: rgba(255, 255, 255, 0.2);
  position: relative;
}

/* ============================================================
   HOMEPAGE HERO
   ============================================================ */
.home-hero {
  padding: 80px 24px 72px;
}
.home-hero .container { max-width: var(--max-width); margin: 0 auto; }

.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--orange);
  flex-shrink: 0;
}

.home-hero h1 {
  font-family: 'Fraunces', serif;
  font-size: 56px;
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -2px;
  color: var(--navy);
  margin-bottom: 20px;
  max-width: 680px;
}

.hero-tagline {
  font-size: 19px;
  color: var(--ink-mid);
  max-width: 520px;
  line-height: 1.65;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--orange);
  color: var(--white);
  border: none;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(232, 100, 44, 0.25);
}
.btn-primary:hover {
  background: var(--orange-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(232, 100, 44, 0.3);
}
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--border-strong);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-decoration: none;
}
.btn-secondary:hover {
  border-color: var(--navy);
  background: var(--navy-wash);
}

/* ============================================================
   TOOL GRID (homepage)
   ============================================================ */
.tools-section {
  padding: 0 24px 72px;
}
.tools-section .container { max-width: var(--max-width); margin: 0 auto; }

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
}
.section-header h2 {
  font-family: 'Fraunces', serif;
  font-size: 32px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.5px;
}
.section-header a {
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  text-decoration: none;
}
.section-header a:hover { text-decoration: underline; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.tool-card {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}
.tool-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.tool-card:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(15, 43, 69, 0.1);
}
.tool-card:hover::after { opacity: 1; }

.tool-card-icon {
  width: 44px;
  height: 44px;
  background: var(--navy);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--white);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}
.tool-card h3 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 4px;
  color: var(--navy);
  position: relative;
  z-index: 1;
}
.tool-card p {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.55;
  position: relative;
  z-index: 1;
}

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb {
  padding: 14px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.breadcrumb ol {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
  font-size: 13px;
}
.breadcrumb li + li::before {
  content: '/';
  color: var(--ink-muted);
  margin-right: 6px;
}
.breadcrumb a {
  color: var(--ink-light);
  text-decoration: none;
  font-weight: 500;
}
.breadcrumb a:hover { color: var(--navy); text-decoration: underline; }
.breadcrumb [aria-current="page"] { color: var(--ink-mid); font-weight: 600; }

/* ============================================================
   PAGE HERO (calculator pages)
   ============================================================ */
.page-hero {
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--border);
}
.page-hero .container {
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-eyebrow::before {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--orange);
  flex-shrink: 0;
}
.page-hero h1 {
  font-family: 'Fraunces', serif;
  font-size: 42px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--navy);
  margin-bottom: 14px;
  max-width: 640px;
}
.page-tagline {
  font-size: 17px;
  color: var(--ink-mid);
  max-width: 580px;
  line-height: 1.65;
}

/* ============================================================
   CALCULATOR CARD
   ============================================================ */
.calc-section { padding: 40px 0 0; }

.calc-wrapper {
  max-width: var(--calc-width);
  margin: 0 auto 32px;
  padding: 0 24px;
}

.calc-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 32px rgba(15,43,69,0.06);
  position: relative;
}
.calc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--navy), var(--orange));
}

.calc-header {
  padding: 24px 32px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  gap: 16px;
  flex-wrap: wrap;
}
.calc-header-left h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 2px;
}
.calc-header-left p {
  color: var(--ink-light);
  font-size: 14px;
}
.calc-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Unit toggle */
.unit-toggle {
  display: flex;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}
.unit-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  border: none;
  background: transparent;
  color: var(--ink-light);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.5px;
  min-width: 44px;
  min-height: 32px;
}
.unit-btn:hover { color: var(--navy); background: var(--navy-wash); }
.unit-btn.active { background: var(--navy); color: var(--white); }

.calc-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--orange);
  background: var(--orange-light);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.calc-body { padding: 28px 32px; }

/* Fields */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 24px;
  margin-bottom: 24px;
}
.calc-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.calc-field label {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-mid);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.field-optional {
  font-weight: 400;
  color: var(--ink-muted);
  text-transform: none;
  letter-spacing: 0;
  font-size: 11px;
  margin-left: 4px;
}
.calc-field input,
.calc-field select {
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  color: var(--navy);
  background: var(--white);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
  width: 100%;
  min-height: 48px; /* WCAG touch target */
}
.calc-field select {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-mid);
  cursor: pointer;
}
.calc-field input:focus,
.calc-field select:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(15, 43, 69, 0.1);
}
.calc-field input[aria-invalid="true"] {
  border-color: var(--error);
  box-shadow: 0 0 0 3px var(--error-bg);
}
.calc-field input::placeholder { color: var(--ink-muted); font-weight: 400; }
.unit-hint {
  font-size: 11px;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
}
.field-error {
  font-size: 12px;
  color: var(--error);
  font-weight: 600;
  min-height: 16px;
}

/* Calculate button */
.calc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--orange);
  color: var(--white);
  border: none;
  padding: 15px 32px;
  border-radius: var(--radius-md);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  width: 100%;
  min-height: 52px;
  box-shadow: 0 2px 8px rgba(232, 100, 44, 0.2);
}
.calc-btn:hover {
  background: var(--orange-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(232, 100, 44, 0.3);
}
.calc-btn:active { transform: scale(0.98); }

/* ── Results panel ───────────────────────────────────────────── */
.calc-results {
  margin-top: 24px;
  background: var(--navy);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
}
.calc-results::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}
.result-top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 20px;
  position: relative;
  gap: 12px;
  flex-wrap: wrap;
}
.result-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 4px;
}
.result-number {
  font-family: 'Fraunces', serif;
  font-size: 52px;
  font-weight: 900;
  color: var(--white);
  line-height: 1;
  letter-spacing: -2px;
}
.result-unit {
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  font-weight: 600;
  color: var(--orange);
  margin-left: 6px;
  letter-spacing: 0.5px;
  vertical-align: baseline;
}
.result-secondary {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  margin-top: 5px;
  letter-spacing: 0.3px;
}
.result-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--orange);
  background: rgba(232, 100, 44, 0.15);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  white-space: nowrap;
  align-self: flex-start;
}
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.result-cell { background: var(--navy); padding: 16px 18px; }
.result-cell-label {
  font-size: 11px;
  color: rgba(255,255,255,0.4);
  font-weight: 500;
  margin-bottom: 4px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.3px;
}
.result-cell-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
}
.result-cell-value.cost { color: var(--green); }
.result-note {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  margin-top: 16px;
  font-style: italic;
  line-height: 1.5;
  position: relative;
}

/* ============================================================
   TRUST BAR
   ============================================================ */
.trust-bar {
  max-width: var(--calc-width);
  margin: 0 auto 48px;
  padding: 0 24px;
}
.trust-inner {
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 24px;
  background: var(--paper);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-mid);
  font-weight: 600;
}
.trust-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--navy-wash);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ============================================================
   CONTENT SECTION
   ============================================================ */
.content-section {
  max-width: var(--content-width);
  margin: 0 auto 56px;
  padding: 0 24px;
}
.content-section h2 {
  font-family: 'Fraunces', serif;
  font-size: 28px;
  font-weight: 800;
  margin: 40px 0 14px;
  color: var(--navy);
  letter-spacing: -0.5px;
}
.content-section h2:first-child { margin-top: 0; }
.content-section h3 {
  font-size: 18px;
  font-weight: 800;
  margin: 28px 0 8px;
  color: var(--navy);
}
.content-section p {
  color: var(--ink-mid);
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: 16px;
}
.content-section p:last-child { margin-bottom: 0; }

.content-list {
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.content-list li {
  font-size: 15px;
  color: var(--ink-mid);
  padding-left: 22px;
  position: relative;
  line-height: 1.65;
}
.content-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--orange);
  font-weight: 700;
}
.content-list li strong { color: var(--ink); }

/* Formula box */
.formula-box {
  background: var(--navy);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 20px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  color: var(--green);
  font-weight: 600;
  position: relative;
  overflow: hidden;
}
.formula-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}
.formula-label {
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
  display: block;
  position: relative;
}

/* ============================================================
   FAQ SECTION
   ============================================================ */
.faq-section {
  max-width: var(--content-width);
  margin: 0 auto 56px;
  padding: 0 24px;
}
.faq-section h2 {
  font-family: 'Fraunces', serif;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--navy);
  letter-spacing: -0.5px;
}
.faq-item {
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color 0.15s;
}
.faq-item:hover { border-color: var(--border-strong); }
.faq-question {
  width: 100%;
  text-align: left;
  background: var(--white);
  border: none;
  padding: 18px 20px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color 0.15s;
  min-height: 60px;
}
.faq-toggle {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  color: var(--ink-light);
  transition: background 0.15s, color 0.15s;
}
.faq-question:hover .faq-toggle { background: var(--navy-wash); color: var(--navy); }
.faq-question[aria-expanded="true"] .faq-toggle { background: var(--navy); color: var(--white); }
.faq-answer {
  padding: 0 20px 18px;
  color: var(--ink-mid);
  font-size: 15px;
  line-height: 1.7;
  display: none;
}
.faq-answer.open { display: block; }
.faq-answer p { margin-bottom: 12px; }
.faq-answer p:last-child { margin-bottom: 0; }

/* ============================================================
   RELATED CALCULATORS
   ============================================================ */
.related-section {
  background: var(--paper);
  border-top: 1px solid var(--border);
  padding: 48px 24px;
}
.related-section .container {
  max-width: var(--max-width);
  margin: 0 auto;
}
.related-section h2 {
  font-family: 'Fraunces', serif;
  font-size: 24px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.5px;
  margin-bottom: 24px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.related-card {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.related-card:hover {
  border-color: var(--navy);
  box-shadow: 0 4px 16px rgba(15, 43, 69, 0.08);
  transform: translateY(-2px);
}
.related-icon {
  width: 40px;
  height: 40px;
  background: var(--navy);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
}
.related-card h3 {
  font-size: 15px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 3px;
}
.related-card p {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.5;
}

/* ============================================================
   DISCLAIMER BAR
   ============================================================ */
.disclaimer-bar {
  background: var(--paper);
  border-top: 1px solid var(--border);
  padding: 20px 24px;
  text-align: center;
}
.disclaimer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
}
.disclaimer-bar p {
  font-size: 13px;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* ============================================================
   404 PAGE
   ============================================================ */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
}
.error-page-inner { max-width: 480px; }
.error-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 80px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.15;
}
.error-page h1 {
  font-family: 'Fraunces', serif;
  font-size: 32px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 12px;
}
.error-page p { color: var(--ink-mid); margin-bottom: 28px; }

/* ============================================================
   LEGAL PAGES (privacy, terms, disclaimer)
   ============================================================ */
.legal-page {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.legal-page h1 {
  font-family: 'Fraunces', serif;
  font-size: 36px;
  font-weight: 900;
  color: var(--navy);
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.legal-page .last-updated {
  font-size: 13px;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 40px;
}
.legal-page h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--navy);
  margin: 36px 0 10px;
}
.legal-page p { color: var(--ink-mid); font-size: 16px; line-height: 1.75; margin-bottom: 16px; }
.legal-page ul { margin: 0 0 16px 20px; }
.legal-page ul li { color: var(--ink-mid); font-size: 16px; line-height: 1.75; margin-bottom: 6px; list-style: disc; }
.legal-page a { color: var(--orange); text-decoration: underline; }

/* ============================================================
   SHAPE TABS (concrete calculator — slab / footing / column / post holes)
   ============================================================ */
.shape-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  background: var(--paper);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 4px;
}
.shape-tab {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 7px;
  padding: 10px 8px;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-light);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  line-height: 1.2;
}
.shape-tab:hover {
  color: var(--navy);
  background: var(--white);
}
.shape-tab.active {
  background: var(--navy);
  color: var(--white);
}
.shape-tab .tab-icon {
  width: 22px;
  height: 22px;
  opacity: 0.6;
}
.shape-tab.active .tab-icon { opacity: 1; }
.shape-panel { display: block; }
.shape-panel[hidden] { display: none; }

/* Price mode row — spans full width */
.calc-price-row {
  grid-column: 1 / -1;
}

/* ============================================================
   DEPTH PRESET BUTTONS (rubber mulch / mulch calculators)
   ============================================================ */
.depth-presets {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.depth-preset {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  border: 2px solid var(--border);
  background: var(--white);
  color: var(--ink-mid);
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
  min-height: 32px;
  letter-spacing: 0.3px;
}
.depth-preset:hover {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--navy-wash);
}
.depth-preset.active {
  border-color: var(--orange);
  background: var(--orange-light);
  color: var(--orange-dark);
}
.depth-preset-label {
  font-size: 11px;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.3px;
}

/* CPSC note inside results (coloured differently from the grey disclaimer note) */
.cpsc-note {
  color: rgba(255,255,255,0.55) !important;
  font-style: normal !important;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 12px;
  margin-top: 4px;
}

/* ============================================================
   UTILITIES
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================================
   MOBILE — 768px
   ============================================================ */
@media (max-width: 768px) {

  /* Nav */
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; padding: 12px 14px; }
  .nav-cta { margin-left: 0 !important; margin-top: 8px; text-align: center; }

  /* Hero */
  .home-hero h1 { font-size: 38px; letter-spacing: -1px; }
  .hero-tagline { font-size: 17px; }
  .page-hero h1 { font-size: 30px; letter-spacing: -0.75px; }
  .page-tagline { font-size: 15px; }

  /* Tools grid */
  .tool-grid { grid-template-columns: 1fr; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 8px; }

  /* Calc card */
  .calc-header { padding: 18px 20px 14px; }
  .calc-body { padding: 20px; }
  .calc-grid { grid-template-columns: 1fr; }

  /* Results */
  .result-number { font-size: 40px; }
  .result-grid { grid-template-columns: 1fr; }

  /* Trust */
  .trust-inner { justify-content: flex-start; gap: 14px; padding: 16px 20px; }

  /* Related */
  .related-grid { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { flex-direction: column; gap: 36px; }
  .footer-links { flex-direction: column; gap: 28px; }
}