/* ==========================================================================
   CONTRACTOR QUOTE STUDIO — ARCHITECTURAL & ENGINEERING DESIGN SYSTEM (v3)
   Aesthetic: Precision CAD / Linear / Stripe / Procore Editorial Minimalist
   Typography: Inter (UI & Copy) + JetBrains Mono (Dimensions, Math, Currency)
   ========================================================================== */

:root {
  /* Core Neutral Surfaces (Warm Architectural Stone & Obsidian Ink) */
  --bg-canvas:      #F8F9FA;
  --bg-surface:     #FFFFFF;
  --bg-subtle:      #F1F5F9;
  --bg-muted:       #E2E8F0;
  --bg-obsidian:    #0B0F19;
  --bg-obsidian-2:  #111827;

  /* Typography Colors */
  --ink-primary:    #0B0F19;
  --ink-secondary:  #334155;
  --ink-tertiary:   #475569;
  --ink-muted:      #64748B;

  /* Structural Hairline Borders */
  --border-subtle:  #E2E8F0;
  --border-strong:  #CBD5E1;
  --border-focus:   #0B0F19;

  /* Disciplined Single Brand Accent (Blueprint Cobalt + Drafting Amber Accent) */
  --accent-cobalt:  #1D4ED8;
  --accent-cobalt-bg: #EFF6FF;
  --accent-amber:   #B45309;
  --accent-amber-bg:#FEF3C7;
  --accent-emerald: #047857;

  /* Legacy Variable Aliases for Compatibility */
  --slate-900: #0B0F19;
  --slate-800: #1E293B;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #475569;
  --slate-400: #64748B;
  --slate-300: #CBD5E1;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --slate-50:  #F8F9FA;
  --amber-500: #D97706;
  --amber-600: #B45309;
  --amber-700: #92400E;
  --amber-50:  #FFFBEB;
  --blue-600:  #1D4ED8;
  --blue-700:  #1E40AF;
  --blue-50:   #EFF6FF;
  --emerald-600: #047857;
  --emerald-50:  #ECFDF5;
  --primary:   #0B0F19;
  --bg-body:   #F8F9FA;
  --bg-surface-alt: #F1F5F9;
  --border-color: #E2E8F0;
  --text-heading: #0B0F19;
  --text-muted:   #475569;

  /* Radii & Elevations */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-xs: 0 1px 2px rgba(11, 15, 25, 0.04);
  --shadow-sm: 0 1px 3px rgba(11, 15, 25, 0.06), 0 1px 2px rgba(11, 15, 25, 0.04);
  --shadow-md: 0 4px 12px -2px rgba(11, 15, 25, 0.06), 0 2px 6px -1px rgba(11, 15, 25, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(11, 15, 25, 0.08), 0 4px 8px -2px rgba(11, 15, 25, 0.04);

  /* Font Stacks */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--ink-secondary);
  background-color: var(--bg-canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--ink-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--accent-cobalt);
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.75rem;
}
@media (max-width: 640px) {
  .container {
    padding: 0 1.15rem;
  }
}

/* ==========================================================================
   1. UNIFIED ARCHITECTURAL HEADER & SPEC BAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner,
.site-header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.75rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-link,
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
  text-decoration: none;
  flex-shrink: 0;
}
.brand-link:hover,
.brand:hover {
  color: var(--ink-primary);
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  background: var(--bg-obsidian);
  color: #FFFFFF;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: -0.03em;
  position: relative;
}
.brand-icon::after {
  content: "";
  position: absolute;
  bottom: 4px;
  right: 4px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #F59E0B;
}

.brand-logo {
  width: 30px !important;
  height: 30px !important;
  flex-shrink: 0;
  display: block;
}

.main-nav,
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link,
.nav-links a {
  color: var(--ink-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.nav-link:hover,
.nav-link.active,
.nav-links a:hover {
  color: var(--ink-primary);
  background: var(--bg-subtle);
  text-decoration: none;
}
.nav-link.active {
  font-weight: 600;
}

.search-wrap {
  position: relative;
  width: 240px;
}
.search-input {
  width: 100%;
  height: 36px;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-canvas);
  color: var(--ink-primary);
  outline: none;
  transition: all 0.15s ease;
}
.search-input::placeholder {
  color: var(--ink-muted);
}
.search-input:focus {
  background: #FFFFFF;
  border-color: var(--ink-primary);
  box-shadow: 0 0 0 2px rgba(11, 15, 25, 0.08);
}

.search-results-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: #FFFFFF;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  max-height: 320px;
  overflow-y: auto;
  padding: 0.35rem;
}
.search-results-dropdown a {
  display: block;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink-primary);
  border-radius: var(--radius-xs);
}
.search-results-dropdown a:hover {
  background: var(--bg-subtle);
  color: var(--accent-cobalt);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--ink-primary);
  font-size: 0.95rem;
}

/* Structural Breadcrumb Bar */
.breadcrumb-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.55rem 0;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--ink-tertiary);
}
.breadcrumb-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.breadcrumb-list a {
  color: var(--ink-tertiary);
  font-weight: 500;
}
.breadcrumb-list a:hover {
  color: var(--ink-primary);
}
.breadcrumb-list li[aria-current="page"] {
  color: var(--ink-primary);
  font-weight: 600;
}
.breadcrumb-sep {
  color: var(--border-strong);
}

/* ==========================================================================
   2. EDITORIAL PAGE HEADER (CLEAN, UNCLUTTERED, ZERO RAINBOW PILLS)
   ========================================================================== */
.tool-hero {
  padding: 2.25rem 0 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
}
.tool-title {
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--ink-primary);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}
.tool-subtitle {
  font-size: 1rem;
  color: var(--ink-secondary);
  max-width: 780px;
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* Refined Technical Spec Strip (Replaces Rainbow Pill Badges) */
.trust-badges {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  padding-top: 0.25rem;
}
.badge,
.badge-amber,
.badge-blue,
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0;
  background: transparent !important;
  border: none !important;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-tertiary) !important;
  letter-spacing: 0.01em;
  box-shadow: none !important;
}
.badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* ==========================================================================
   3. TWO-COLUMN ENGINEERING WORKBENCH (INPUTS & LIVE TAKEOFF SHEET)
   ========================================================================== */
.tool-workspace {
  padding: 0 0 3.5rem;
}
.workspace-grid {
  display: grid;
  grid-template-columns: 440px 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 1024px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

.tool-card,
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-xs);
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-subtle);
}
.card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-primary);
}

/* Segmented Quick-Preset Bar */
.presets-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(95px, 1fr));
  gap: 0.375rem;
  background: var(--bg-subtle);
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}
.preset-btn {
  background: transparent;
  border: 1px solid transparent;
  padding: 0.4rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-xs);
  color: var(--ink-secondary);
  cursor: pointer;
  text-align: center;
  transition: all 0.12s ease;
}
.preset-btn:hover {
  background: #FFFFFF;
  color: var(--ink-primary);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-xs);
}

/* Input Controls */
.inputs-subgrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 520px) {
  .inputs-subgrid {
    grid-template-columns: 1fr;
  }
}

.input-group {
  margin-bottom: 1.15rem;
}
.input-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.4rem;
}
.input-label,
.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-primary);
  display: block;
}
.input-hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-tertiary);
}
.input-control-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-field,
.form-input,
.form-select {
  width: 100%;
  height: 40px;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  color: var(--ink-primary);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
select.input-field,
.form-select {
  font-family: var(--font-sans);
  cursor: pointer;
}
.input-field:focus,
.form-input:focus,
.form-select:focus {
  border-color: var(--ink-primary);
  box-shadow: 0 0 0 3px rgba(11, 15, 25, 0.08);
}
.input-suffix {
  position: absolute;
  right: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-tertiary);
  pointer-events: none;
  background: #FFFFFF;
  padding-left: 0.25rem;
}

/* ==========================================================================
   4. ARCHITECTURAL TAKEOFF RESULTS PANEL (UNIFIED MONOCHROME + COBALT)
   ========================================================================== */
.results-col {
  position: sticky;
  top: 84px;
}

/* Unified Architectural Spec Strip (Replaces Clashing Black/Yellow/Blue Boxes) */
.metric-highlight-grid,
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  background: var(--border-subtle);
  gap: 1px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.metric-box,
.metric-box.amber,
.metric-box.blue,
.metric-card {
  background: var(--bg-surface) !important;
  color: var(--ink-primary) !important;
  padding: 1.15rem 1.25rem !important;
  border: none !important;
  border-radius: 0 !important;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
/* Subtle top highlight on the primary metric cell */
.metric-highlight-grid > .metric-box:first-child,
.metric-grid > .metric-card:first-child {
  background: #FAFBFD !important;
}

.metric-lbl,
.metric-label {
  font-family: var(--font-sans);
  font-size: 0.72rem !important;
  font-weight: 600 !important;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-tertiary) !important;
  margin-bottom: 0.4rem;
}

.metric-val,
.metric-value {
  font-family: var(--font-mono);
  font-size: 1.45rem !important;
  font-weight: 700 !important;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--ink-primary) !important;
}
.metric-box.amber .metric-val,
.text-amber {
  color: var(--accent-cobalt) !important;
}

.metric-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem !important;
  margin-top: 0.35rem;
  color: var(--ink-tertiary) !important;
}

/* Engineering Takeoff & Reference Tables */
.data-table-wrap,
.table-responsive {
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: #FFFFFF;
}
.data-table,
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84375rem;
  text-align: left;
  background: #FFFFFF;
  font-variant-numeric: tabular-nums;
}
.data-table th,
.table th {
  background: var(--bg-canvas);
  color: var(--ink-tertiary);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}
.data-table td,
.table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--bg-subtle);
  color: var(--ink-secondary);
}
.data-table td:nth-child(n+2),
.table td:nth-child(n+2) {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.data-table tr:last-child td,
.table tr:last-child td {
  border-bottom: none;
}
.data-table tr.total-row {
  background: var(--bg-canvas);
  font-weight: 700;
  color: var(--ink-primary);
  border-top: 1px solid var(--border-strong);
}
.data-table tr.total-row td {
  color: var(--ink-primary);
}

/* CAD Grid SVG Diagram Card */
.svg-diagram-card {
  background-color: #FAFBFD;
  background-image: radial-gradient(#CBD5E1 0.85px, transparent 0.85px);
  background-size: 16px 16px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  text-align: center;
}
.svg-diagram-card svg {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
.diagram-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-tertiary);
  margin-top: 0.75rem;
}

/* Executive Buttons */
.action-buttons-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.15rem;
  font-family: var(--font-sans);
  font-size: 0.84375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
}
.btn-primary,
.btn-blue {
  background: var(--bg-obsidian);
  color: #FFFFFF;
  border-color: var(--bg-obsidian);
}
.btn-primary:hover,
.btn-blue:hover {
  background: #1E293B;
  color: #FFFFFF;
  text-decoration: none;
}
.btn-secondary {
  background: #FFFFFF;
  color: var(--ink-primary);
  border: 1px solid var(--border-strong);
}
.btn-secondary:hover {
  background: var(--bg-subtle);
  color: var(--ink-primary);
  text-decoration: none;
}
.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.8125rem;
}

/* ==========================================================================
   5. TECHNICAL SECTIONS: FORMULAS, BENCHMARK TABLES, FAQS & CLUSTERS
   ========================================================================== */
.formula-section,
.reference-section,
.faq-section,
.cluster-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}
.section-subtitle {
  font-size: 0.9375rem;
  color: var(--ink-tertiary);
  margin-bottom: 1.5rem;
}

.formula-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.formula-math {
  font-family: var(--font-mono);
  font-size: 0.84375rem;
  background: var(--bg-canvas);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--ink-primary);
  margin: 0.5rem 0;
  display: block;
  overflow-x: auto;
}
.formula-steps-list {
  list-style: none;
  display: grid;
  gap: 0.625rem;
  margin-top: 1rem;
}
.formula-step-item {
  padding: 0.75rem 1rem;
  background: var(--bg-canvas);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-secondary);
}
.formula-step-item strong {
  font-family: var(--font-sans);
  color: var(--ink-primary);
}

/* Clean Accordion FAQs */
.faq-list {
  display: grid;
  gap: 0.625rem;
  max-width: 920px;
}
.faq-item,
details.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.35rem;
  box-shadow: none;
}
.faq-item summary,
details.card summary {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-item summary::-webkit-details-marker,
details.card summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after,
details.card summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--ink-tertiary);
  font-weight: 400;
}
.faq-item[open] summary::after,
details.card[open] summary::after {
  content: "−";
}
.faq-item p,
details.card p {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--bg-subtle);
  font-size: 0.9rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

/* Cluster Directory Cards */
.cluster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.cluster-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  text-decoration: none;
  color: inherit;
}
.cluster-card:hover {
  border-color: var(--ink-primary);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}
.cluster-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-tertiary);
  margin-bottom: 0.5rem;
}
.cluster-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}
.cluster-card-desc {
  font-size: 0.84375rem;
  color: var(--ink-secondary);
  margin-bottom: 1rem;
  line-height: 1.55;
}
.cluster-link-arrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Understated Architectural B2B Callout */
.b2b-banner {
  background: var(--bg-obsidian);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 2.25rem 2.5rem;
  margin: 2.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
@media (max-width: 768px) {
  .b2b-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.75rem;
  }
}
.b2b-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #FFFFFF;
  margin-bottom: 0.35rem;
}
.b2b-content p {
  color: #94A3B8;
  font-size: 0.9rem;
  max-width: 640px;
}
.b2b-banner .btn-primary {
  background: #FFFFFF;
  color: var(--ink-primary);
  border-color: #FFFFFF;
  flex-shrink: 0;
}
.b2b-banner .btn-primary:hover {
  background: var(--bg-subtle);
}

/* ==========================================================================
   6. UNIFIED FOOTER
   ========================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2.5rem;
  color: var(--ink-tertiary);
  font-size: 0.84375rem;
}
.site-footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.75rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 2.25rem;
  margin-bottom: 2.5rem;
}
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}
.footer-col h4,
.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.875rem;
}
.footer-links {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}
.footer-links a {
  color: var(--ink-secondary);
  font-size: 0.84375rem;
}
.footer-links a:hover {
  color: var(--ink-primary);
}
.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--ink-tertiary);
}

/* ==========================================================================
   7. HOMEPAGE SPECIFIC WORKBENCH & SILO DIRECTORY CLASSES
   ========================================================================== */
.home-hero {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 3.25rem 0 3.75rem;
}
.home-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 1024px) {
  .home-hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}
.home-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-xs);
  margin-bottom: 1.15rem;
}
.home-eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cobalt);
}
.home-title {
  font-size: clamp(2rem, 3.6vw, 2.75rem);
  font-weight: 700;
  color: var(--ink-primary);
  letter-spacing: -0.035em;
  line-height: 1.12;
  margin-bottom: 1rem;
}
.home-lead {
  font-size: 1.05rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 1.75rem;
}
.home-specs-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}
.home-spec-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-primary);
}
.home-spec-item span {
  font-size: 0.78rem;
  color: var(--ink-tertiary);
}

/* Homepage Interactive Workbench Card */
.workbench-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.workbench-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--bg-canvas);
  border-bottom: 1px solid var(--border-subtle);
}
.workbench-tab {
  padding: 0.75rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-tertiary);
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-subtle);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}
.workbench-tab:last-child {
  border-right: none;
}
.workbench-tab:hover {
  color: var(--ink-primary);
  background: rgba(255, 255, 255, 0.6);
}
.workbench-tab.active {
  color: var(--ink-primary);
  background: var(--bg-surface);
  border-bottom-color: var(--ink-primary);
}
.workbench-body {
  padding: 1.5rem;
}

/* Homepage 4-Silo Architectural Directory */
.silo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}
@media (max-width: 820px) {
  .silo-grid {
    grid-template-columns: 1fr;
  }
}
.silo-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.silo-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.silo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--bg-subtle);
}
.silo-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-tertiary);
}
.silo-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-secondary);
  background: var(--bg-subtle);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
}
.silo-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}
.silo-title a {
  color: var(--ink-primary);
}
.silo-desc {
  font-size: 0.875rem;
  color: var(--ink-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.55;
}
.silo-links {
  list-style: none;
  border-top: 1px solid var(--bg-subtle);
}
.silo-links li {
  border-bottom: 1px solid var(--bg-subtle);
}
.silo-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-primary);
  transition: padding-left 0.15s ease, color 0.15s ease;
}
.silo-links a:hover {
  padding-left: 0.5rem;
  color: var(--accent-cobalt);
  text-decoration: none;
}
.silo-links a span:last-child {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-tertiary);
}

/* Utilities */
.text-slate { color: var(--ink-primary) !important; }
.text-muted { color: var(--ink-tertiary) !important; }
.text-center { text-align: center; }
.text-sm { font-size: 0.84375rem; }
.text-xs { font-size: 0.75rem; }
.font-bold { font-weight: 700; }

/* Toast & Mobile Drawer */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--bg-obsidian);
  color: #FFFFFF;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.84375rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  border-left: 3px solid var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mobile-drawer {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 25, 0.5);
  z-index: 200;
}
.mobile-drawer-inner {
  background: #FFFFFF;
  width: 280px;
  max-width: 85vw;
  height: 100%;
  padding: 1.25rem;
  box-shadow: var(--shadow-lg);
}
.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.mobile-nav a {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--ink-primary);
  padding: 0.45rem 0;
}

@media (max-width: 920px) {
  .nav-links,
  .search-wrap,
  .main-nav {
    display: none;
  }
  .main-nav.nav-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #FFFFFF;
    padding: 1rem 1.75rem;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-md);
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
}

/* Print Stylesheet */
@media print {
  body {
    background: #FFFFFF !important;
    color: #000000 !important;
    font-size: 10.5pt !important;
  }
  .site-header,
  .breadcrumb-bar,
  .tool-hero .trust-badges,
  .input-col,
  .presets-row,
  .action-buttons-row,
  .formula-section,
  .reference-section,
  .faq-section,
  .cluster-section,
  .b2b-banner,
  .site-footer,
  .toast-container,
  .no-print {
    display: none !important;
  }
  .workspace-grid {
    display: block !important;
  }
  .results-col {
    position: static !important;
  }
  .tool-card {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }
  .print-header {
    display: block !important;
    border-bottom: 2px solid #000000;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
  }
}
.print-header {
  display: none;
}