/**
 * businesscalc-design-system app.css
 * Core component styles built exclusively from tokens.css variables.
 * ZERO hardcoded hex colors permitted outside tokens.css.
 */

/* ==========================================================================
   1. Font Declarations (Self-hosted woff2, font-display: swap)
   ========================================================================== */

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/SpaceGrotesk-600.woff2') format('woff2');
}

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/SpaceGrotesk-700.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/Inter-400.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/Inter-600.woff2') format('woff2');
}

/* ==========================================================================
   2. Base Resets & Global Styles (Overflow Safety Net)
   ========================================================================== */

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

html, body {
  overflow-x: hidden;
  max-width: 100%;
}

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

body {
  background-color: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Tabular Numerics — Mandatory sitewide rule */
.tnum, .tabular-nums, table td, .stat-value, .result-figure, .badge-num, input[type="number"], .metric-val {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* Typography Hierarchy */
h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.2;
}

h1, .display-xl {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.display-lg {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

p.lead, .body-lg {
  font-size: 1.125rem;
  color: var(--ink-muted);
}

.caption {
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-ink);
}

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

a:hover {
  color: var(--accent-hover);
}

code, kbd, pre, .font-mono {
  font-family: var(--font-mono);
}

/* Accessible Focus States */
:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--accent);
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent);
  color: var(--on-accent);
  padding: var(--space-xs) var(--space-lg);
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 10000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
}

/* Container & Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
}

main {
  flex: 1;
}

.text-center {
  text-align: center;
}

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

.link-accent {
  color: var(--accent-ink);
  font-weight: 600;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.link-accent:hover {
  color: var(--accent-hover);
}

.hero-btn-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-md);
}

/* ==========================================================================
   3. Sticky Header & 5-Hub Mega Menu
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--canvas);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  position: relative; /* anchor for the full-width mega-menu panel */
}

/* Wordmark Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.brand-mark {
  width: 12px;
  height: 12px;
  background-color: var(--accent);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 12px var(--accent-soft);
}

/* Desktop Navigation Link List */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links-list {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--ink-muted);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-link:hover, .nav-link:focus-visible {
  color: var(--ink);
}

.nav-link[aria-expanded="true"] {
  color: var(--accent-ink);
}

.chevron {
  width: 14px;
  height: 14px;
  fill: currentColor;
  transition: transform 0.2s ease;
}

.nav-link[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

/* Mega item anchors its panel to .nav-container (not the narrow li) */
.nav-item-mega {
  position: static;
}

/* Mega Menu Panel (Desktop) — spans the nav container, centered, viewport-safe */
.mega-menu-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  width: auto;
  max-width: 1200px;
  margin-inline: auto;
  background-color: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-l2);
  padding: var(--space-xxl);
  display: none;
  z-index: 1001;
  margin-top: 8px;
}

.nav-item-mega:hover .mega-menu-panel,
.nav-item-mega:focus-within .mega-menu-panel,
.mega-menu-panel.active {
  display: block;
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-xl);
}

.mega-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mega-column-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent-ink);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--hairline);
  margin-bottom: var(--space-xs);
}

.mega-column ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mega-column a {
  color: var(--ink-muted);
  font-size: 0.875rem;
  line-height: 1.4;
  padding: var(--space-xxs) 0;
  display: block;
}

.mega-column a:hover {
  color: var(--ink);
}

.badge-soon {
  font-size: 0.75rem;
  color: var(--ink-subtle);
  margin-left: 4px;
}

/* Header CTA Visibility rules */
.header-cta-desktop {
  display: flex;
}

.mobile-cta-wrapper {
  display: none;
}

/* Mobile Toggle Hamburger */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--ink);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
}

/* ==========================================================================
   4. Buttons & CTAs (Locked contrast: Dark text on Emerald)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  border: 1px solid transparent;
  min-height: 44px;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--on-accent); /* dark ink on emerald (>=4.5:1 contrast) */
  border-color: var(--accent);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--on-accent);
}

.btn-secondary {
  background-color: var(--surface-2);
  color: var(--ink);
  border-color: var(--hairline-strong);
}

.btn-secondary:hover {
  background-color: var(--surface-3);
  border-color: var(--accent-soft);
  color: var(--ink);
}

.btn-ghost {
  background-color: transparent;
  color: var(--accent-ink);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--accent-hover);
}

/* ==========================================================================
   5. Hero & Glass Workspace (Above-The-Fold Engine)
   ========================================================================== */

.hero-section {
  position: relative;
  padding: var(--space-huge) 0;
  overflow: hidden;
}

.hero-wash {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 480px;
  background: radial-gradient(circle at 50% 0%, var(--accent-soft) 0%, rgba(10, 15, 26, 0) 75%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.badge-hero {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background-color: var(--accent-soft);
  color: var(--accent-ink);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--accent-soft);
}

/* Glass Workspace Panel */
.glass-workspace {
  background-color: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-xl);
  padding: var(--space-xxl);
  margin-top: var(--space-xl);
}

.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xxl);
}

/* Input Form Controls */
.input-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.input-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-muted);
  display: flex;
  justify-content: space-between;
}

.form-input {
  background-color: var(--surface-3);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  min-height: 44px;
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}

/* Toggle Switch Group */
.toggle-group {
  display: inline-flex;
  background-color: var(--surface-3);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: var(--space-xxs);
}

.toggle-btn {
  background: transparent;
  border: none;
  color: var(--ink-muted);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
}

.toggle-btn.active {
  background-color: var(--surface-2);
  color: var(--accent-ink);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Result Dashboard Glow Card */
.card-result-glow {
  background-color: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  box-shadow: var(--result-glow);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.result-figure-container {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.result-figure {
  font-family: var(--font-body);
  font-size: 3rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}

.result-unit {
  font-size: 1.25rem;
  color: var(--ink-muted);
  font-weight: 400;
}

/* Metric Quad Grid */
.metric-quad-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.metric-tile {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.metric-val {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
}

/* Benchmark Chip */
.benchmark-chip {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  width: fit-content;
}

.benchmark-positive {
  background-color: var(--accent-soft);
  color: var(--positive);
}

.benchmark-warning {
  background-color: rgba(251, 191, 36, 0.12);
  color: var(--warning);
}

.benchmark-negative {
  background-color: rgba(248, 113, 113, 0.12);
  color: var(--negative);
}

/* Signature Horizontal Bar (DIO + DSO - DPO = CCC) */
.ccc-bar-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.ccc-bar-track {
  height: 24px;
  background-color: var(--surface-3);
  border-radius: var(--radius-pill);
  display: flex;
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
}

.ccc-segment {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  transition: width 0.3s ease;
}

.ccc-seg-dio {
  background-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-ink);
}

.ccc-seg-dso {
  background-color: rgba(16, 185, 129, 0.5);
  color: var(--ink);
}

.ccc-seg-dpo {
  background-color: rgba(248, 113, 113, 0.3);
  color: var(--negative);
}

/* Cash Unlock Scenario Panel */
.cash-unlock-panel {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.slider-input {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Action Bar */
.action-bar {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--hairline);
}

/* Tabs System */
.tabs-container {
  margin-top: var(--space-huge);
}

.tab-nav {
  display: flex;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--hairline-strong);
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--ink-muted);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-btn:hover {
  color: var(--ink);
}

.tab-btn.active {
  color: var(--accent-ink);
  border-bottom-color: var(--accent);
  background-color: var(--surface-2);
}

.tab-content {
  padding: var(--space-xxl) 0;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Accordion FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.faq-item summary {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin-top: var(--space-md);
  color: var(--ink-muted);
}

/* ERP Slot Lead Magnet */
.erp-slot {
  background-color: var(--surface-2);
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-top: var(--space-xl);
}

/* Mesh Links Grid */
.mesh-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.mesh-link {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  color: var(--ink-muted);
  font-size: 0.875rem;
  display: block;
}

.mesh-link:hover {
  color: var(--accent-ink);
  border-color: var(--accent-soft);
}

/* ==========================================================================
   6. Cards & Flagship Grid
   ========================================================================== */

.section-padding {
  padding: var(--space-huge) 0;
}

.grid-5-hub {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-xxl);
}

.card {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  background-color: var(--surface-2);
  border-color: var(--hairline-strong);
}

.card-flagship {
  background-color: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  box-shadow: var(--shadow-l2);
  position: relative;
  overflow: hidden;
}

.card-flagship::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.flagship-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-xxl);
}

.pill {
  display: inline-flex;
  align-items: center;
  background-color: var(--accent-soft);
  color: var(--accent-ink);
  padding: var(--space-xxs) var(--space-sm);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
}

.pill-muted {
  background-color: var(--surface-3);
  color: var(--ink-muted);
}

/* Tool List in Hub Index */
.tool-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  list-style: none;
}

.tool-item {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.tool-item:hover {
  border-color: var(--hairline-strong);
  background-color: var(--surface-2);
}

.tool-item-flagship {
  border-color: var(--accent-soft);
  background-color: var(--surface-2);
}

.tool-item-flagship:hover {
  border-color: var(--accent);
}

/* ==========================================================================
   7. Footer Component (4 Columns)
   ========================================================================== */

.site-footer {
  background-color: var(--surface-1);
  border-top: 1px solid var(--hairline);
  padding: var(--space-huge) 0 var(--space-xxl) 0;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xxl);
  margin-bottom: var(--space-huge);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-column-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  color: var(--ink-subtle);
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: var(--ink);
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-subtle);
  font-size: 0.8125rem;
}

/* ==========================================================================
   8. Responsive Design (≤1024px, ≤900px, ≤600px)
   ========================================================================== */

@media (max-width: 1024px) {
  .grid-5-hub {
    grid-template-columns: repeat(2, 1fr);
  }
  .mesh-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  h1, .display-xl {
    font-size: 2.5rem;
  }
  
  .display-lg {
    font-size: 2rem;
  }

  .workspace-grid {
    grid-template-columns: 1fr; /* Stacked result-first mode */
  }

  /* ≤900px stacked result-first: Result card renders on top */
  .workspace-grid > .card-result-glow {
    order: -1;
  }

  .header-cta-desktop {
    display: none !important;
  }

  .mobile-cta-wrapper {
    display: block;
    width: 100%;
    margin-top: var(--space-md);
  }

  .nav-links {
    display: none;
  }

  .mobile-nav-toggle {
    display: block;
  }

  .nav-links.nav-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--surface-1);
    border-bottom: 1px solid var(--hairline-strong);
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  /* Stack the nav list vertically in the mobile drawer (override desktop flex-row) */
  .nav-links-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-sm);
  }

  .mega-menu-panel {
    position: static;
    transform: none;
    width: 100%;
    box-shadow: none;
    padding: var(--space-md);
    margin-top: var(--space-sm);
    display: none;
  }

  .accordion-open {
    display: block !important;
  }

  .mega-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .flagship-grid, .grid-5-hub, .tool-list {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* Dedicated Phone Breakpoint (≤600px) */
@media (max-width: 600px) {
  h1, .display-xl {
    font-size: 2rem;
    letter-spacing: -0.01em;
  }
  
  .display-lg {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.375rem;
  }

  .container {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .glass-workspace {
    padding: var(--space-lg);
  }

  .input-row-2col, .metric-quad-grid, .mesh-grid {
    grid-template-columns: 1fr;
  }

  .hero-section {
    padding: var(--space-xxl) 0;
  }

  .card {
    padding: var(--space-lg);
  }

  .btn {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    white-space: normal;
    text-align: center;
  }

  .hero-content {
    gap: var(--space-md);
  }

  .badge-hero {
    font-size: 0.75rem;
    padding: 4px 10px;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* ==========================================================================
   9. Depth Standard Upgrades (Persona Jump-Nav, Multi-lever Sliders, Citations)
   ========================================================================== */

.persona-jump-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background-color: var(--surface-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  padding: var(--space-xs) var(--space-lg);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
  width: fit-content;
}

.persona-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-muted);
  padding: var(--space-xxs) var(--space-sm);
  border-radius: var(--radius-pill);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.persona-chip:hover {
  color: var(--accent-ink);
  background-color: var(--surface-2);
}

.multi-lever-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.multi-lever-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  background-color: var(--surface-2);
  border: 1px solid var(--hairline);
  padding: var(--space-md);
  border-radius: var(--radius-md);
}

.data-source-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
  background: var(--surface-1);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.data-source-table th, .data-source-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--hairline);
  text-align: left;
}

.data-source-table th {
  background-color: var(--surface-2);
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--ink);
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.glossary-card {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.glossary-card h4 {
  color: var(--accent-ink);
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.citation-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.citation-item {
  background-color: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.citation-item a {
  color: var(--accent-ink);
  font-weight: 600;
}

.citation-item a:hover {
  text-decoration: underline;
}

.eeat-box {
  background-color: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-top: var(--space-xxl);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

@media (max-width: 600px) {
  .glossary-grid {
    grid-template-columns: 1fr;
  }
  .eeat-box {
    flex-direction: column;
  }
}

/* ==========================================================================
   10. Task C — Depreciation Schedule Table & Area Chart Styles
   ========================================================================== */

.schedule-table-container {
  overflow-x: auto;
  max-height: 480px;
  background-color: var(--surface-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
  position: relative;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.schedule-table th {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--surface-2);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 2px solid var(--hairline-strong);
}

.schedule-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-muted);
}

.schedule-table tr:hover td {
  background-color: var(--surface-2);
  color: var(--ink);
}

.schedule-table .num-col {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-body);
}

.dep-chart-card {
  background-color: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.dep-chart-svg {
  width: 100%;
  height: 180px;
  overflow: visible;
}

/* ==========================================================================
   Brand v2 & Visual Upgrades (Append-only)
   ========================================================================== */

/* Brand Logo Lockup */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.brand-wordmark b {
  color: var(--accent-ink);
  font-weight: 700;
}

/* Product-Led Hero Layout */
.hero-v2 {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 40px;
  align-items: center;
  padding: var(--space-xl) 0;
}

@media (max-width: 900px) {
  .hero-v2 {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.product-shot-glass {
  background: linear-gradient(180deg, var(--surface-2), var(--surface-1));
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: 0 24px 60px rgba(0,0,0,.5), 0 0 0 1px var(--accent-soft), inset 0 1px 0 rgba(255,255,255,.05);
}

.metric-mini {
  background: var(--surface-3);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.ccc-bar-composite {
  display: flex;
  height: 26px;
  border-radius: 7px;
  overflow: hidden;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--on-accent);
}

.ccc-bar-seg {
  display: grid;
  place-items: center;
  font-variant-numeric: tabular-nums;
}

/* Segmented Control Persona Tabs */
.tab-segmented {
  display: inline-flex;
  gap: 6px;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  padding: 5px;
}

.tab-segmented-btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  transition: all 0.15s ease;
}

.tab-segmented-btn:hover {
  color: var(--ink);
}

.tab-segmented-btn.active, .tab-segmented-btn[aria-selected="true"] {
  background: var(--surface-2);
  color: var(--accent-ink);
  border-color: var(--hairline-strong);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* Focus Visible & Micro-interactions */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}



/* ============================================================
   Brand v2 nav fix — per-hub dropdown menus hide until hover
   (new .mega-menu markup had no display:none default → overlap)
   ============================================================ */
.nav-item-dropdown { position: static; }
.mega-menu {
  position: absolute; top: 100%; left: 0; right: 0;
  width: auto; max-width: 1200px; margin: 8px auto 0;
  background: var(--surface-2); border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-l2);
  padding: var(--space-xxl); display: none; z-index: 1001;
}
.mega-menu-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-lg); }
.mega-col { display: flex; flex-direction: column; gap: var(--space-sm); }
.mega-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-xs); }
.nav-item-dropdown:hover > .mega-menu,
.nav-item-dropdown:focus-within > .mega-menu,
.mega-menu.active { display: block; }
/* hover-bridge so the menu doesn't close in the 8px gap */
.nav-item-dropdown::after { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 10px; }
@media (max-width: 900px) {
  .mega-menu { position: static; box-shadow: none; padding: var(--space-md);
    max-width: none; margin: var(--space-xs) 0 0; border-color: var(--hairline); }
  .mega-menu-grid { grid-template-columns: 1fr; gap: var(--space-md); }
  .nav-item-dropdown > .mega-menu { display: none; }
  .nav-item-dropdown > .mega-menu.active { display: block; }
}

/* ============================================================
   Organized Mega-Menu Styling (BuilderCalc Pattern)
   ============================================================ */
.mega-col .eyebrow {
  color: var(--accent-ink);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 6px;
}

.mega-item {
  display: block;
  padding: 6px 0;
  text-decoration: none;
  transition: all 0.15s ease;
}

.mega-item-title {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink);
  display: block;
  line-height: 1.25;
}

.mega-item:hover .mega-item-title {
  color: var(--accent-ink);
}

.mega-item-sub {
  font-size: 0.72rem;
  color: var(--ink-subtle);
  display: block;
  margin-top: 2px;
  line-height: 1.3;
}

.mega-view-all {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-ink);
  text-decoration: none;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
}

.mega-view-all:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ============================================================
   Pillar Sub-Navigation Component
   ============================================================ */
.pillar-subnav {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  background: var(--surface-1);
  border-bottom: 1px solid var(--hairline);
  padding: 10px 24px;
  margin-bottom: 24px;
  position: sticky;
  top: 72px;
  z-index: 900;
  white-space: nowrap;
}

.pillar-subnav a {
  color: var(--ink-muted);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: all 0.2s ease;
}

.pillar-subnav a:hover {
  color: var(--ink);
  background: var(--surface-2);
}

.pillar-subnav a.on,
.pillar-subnav a.active {
  color: var(--on-accent);
  background: var(--accent);
  font-weight: 700;
}



/* ============================================================
   Mobile hamburger icon — emerald bars (was undefined → invisible)
   ============================================================ */
.hamburger-box { display: block; position: relative; width: 24px; height: 16px; }
.hamburger-inner { top: 50%; margin-top: -1px; }
.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
  position: absolute; left: 0; width: 24px; height: 2px;
  background-color: var(--accent); border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.hamburger-inner::before,
.hamburger-inner::after { content: ""; display: block; }
.hamburger-inner::before { top: -7px; }
.hamburger-inner::after  { top: 7px; }
.mobile-nav-toggle { color: var(--accent); border-color: var(--hairline-strong); }
/* open state → X */
.mobile-nav-toggle[aria-expanded="true"] .hamburger-inner { background-color: transparent; }
.mobile-nav-toggle[aria-expanded="true"] .hamburger-inner::before { top: 0; transform: rotate(45deg); }
.mobile-nav-toggle[aria-expanded="true"] .hamburger-inner::after  { top: 0; transform: rotate(-45deg); }

/* ============================================================
   Global Mega-Footer Component
   ============================================================ */
.site-footer {
  background-color: var(--surface-1);
  border-top: 1px solid var(--hairline-strong);
  padding: 48px 0 24px 0;
  margin-top: var(--space-huge);
  color: var(--ink-muted);
  font-size: 0.875rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .footer-col-brand {
    grid-column: span 2;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-col-brand {
    grid-column: span 1;
  }
}

.footer-col-brand .brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.footer-tagline {
  color: var(--ink-muted);
  font-size: 0.85rem;
  line-height: 1.5;
  max-width: 320px;
}

.footer-col-title {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 16px 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--accent-ink);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--ink-subtle);
}

.footer-copy {
  margin: 0;
}

.footer-disclaimer {
  margin: 0;
  max-width: 600px;
  text-align: right;
}

@media (max-width: 768px) {
  .footer-disclaimer {
    text-align: left;
  }
}