/* ==========================================================================
   Apex Core Integration LLC — Master Design System & Stylesheet
   Crafted with Enterprise UI/UX Principles & System Architecture Aesthetics
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* Dark Mode Default Tokens (High-End Technical Aesthetic) */
  --bg-base: #0a0f16;
  --bg-gradient: radial-gradient(circle at 50% 0%, #152232 0%, #0a0f16 75%);
  --bg-surface: #101924;
  --bg-card: rgba(16, 25, 36, 0.85);
  --bg-card-hover: rgba(22, 35, 50, 0.95);
  --bg-elevated: #162434;
  --bg-pill: rgba(52, 152, 219, 0.12);
  
  --text-main: #f8fafc;
  --text-lead: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --color-blue: #3498db;
  --color-blue-electric: #2563eb;
  --color-blue-glow: rgba(52, 152, 219, 0.35);
  --color-gold: #f1c40f;
  --color-gold-glow: rgba(241, 196, 15, 0.25);
  --color-amber: #f59e0b;
  --color-emerald: #10b981;
  --color-emerald-glow: rgba(16, 185, 129, 0.3);
  --color-rose: #f43f5e;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.12);
  --border-active: rgba(52, 152, 219, 0.5);
  --border-gold: rgba(241, 196, 15, 0.4);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(52, 152, 219, 0.25);
  --shadow-gold-glow: 0 0 25px rgba(241, 196, 15, 0.25);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --container-max: 1240px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-gradient: radial-gradient(circle at 50% 0%, #e8f0fe 0%, #f8fafc 80%);
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #ffffff;
  --bg-elevated: #f1f5f9;
  --bg-pill: rgba(37, 99, 235, 0.08);
  
  --text-main: #0f172a;
  --text-lead: #1e293b;
  --text-muted: #475569;
  --text-dim: #64748b;
  
  --color-blue: #2563eb;
  --color-blue-electric: #1d4ed8;
  --color-blue-glow: rgba(37, 99, 235, 0.15);
  --color-gold: #d97706;
  --color-gold-glow: rgba(217, 119, 6, 0.15);
  
  --border-subtle: #e2e8f0;
  --border-card: #cbd5e1;
  --border-active: #2563eb;
  --border-gold: #d97706;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.12);
}

/* Base Reset & Core Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

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

::selection {
  background: var(--color-blue);
  color: #ffffff;
}

:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
}

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

/* Container */
.container {
  width: min(var(--container-max), calc(100% - 48px));
  margin-inline: auto;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-main);
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.4rem, 4.8vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.8rem);
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.6rem);
}

h4 {
  font-size: 1.15rem;
}

p {
  color: var(--text-lead);
}

.text-muted {
  color: var(--text-muted);
}

.font-mono {
  font-family: var(--font-mono);
}

/* Badges & Eyebrows */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-blue);
  background: var(--bg-pill);
  border: 1px solid var(--border-active);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.eyebrow.gold {
  color: var(--color-gold);
  border-color: var(--border-gold);
  background: rgba(241, 196, 15, 0.1);
}

.live-pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Navigation & Top Bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 22, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="light"] .topbar {
  background: rgba(255, 255, 255, 0.9);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.brand-link:hover .brand-logo-img {
  transform: rotate(5deg) scale(1.05);
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-main);
  line-height: 1.1;
}

.brand-tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-blue);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  color: var(--text-main);
  border-color: var(--color-blue);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-blue), var(--color-blue-electric));
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-secondary {
  background: var(--bg-elevated);
  border-color: var(--border-card);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-blue);
  transform: translateY(-2px);
}

.btn-gold {
  background: linear-gradient(135deg, var(--color-gold), #d97706);
  color: #0f172a !important;
  box-shadow: 0 4px 14px rgba(241, 196, 15, 0.3);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(241, 196, 15, 0.45);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-card);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.84rem;
}

/* Sections */
.section {
  padding: 96px 0;
  position: relative;
}

.section.alt {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px;
}

.section-head.text-left {
  text-align: left;
  margin-inline: 0;
}

.section-head h2 {
  margin-top: 10px;
  margin-bottom: 16px;
}

.section-head p {
  font-size: 1.12rem;
  color: var(--text-muted);
}

/* Hero Section */
.hero-section {
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items: center;
}

.hero-content p.lead {
  font-size: 1.25rem;
  color: var(--text-lead);
  margin-top: 20px;
  margin-bottom: 34px;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-metrics-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.metric-item strong {
  display: block;
  font-size: 1.85rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--color-gold);
  line-height: 1.1;
}

.metric-item span {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.3;
  display: block;
  margin-top: 4px;
}

/* Hero Live Telemetry Console Component */
.telemetry-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  position: relative;
}

.telemetry-header {
  background: var(--bg-elevated);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5f56;
}

.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #27c93f; }

.telemetry-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.telemetry-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-lead);
}

.telemetry-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-emerald);
  border-radius: var(--radius-full);
  font-size: 0.74rem;
  font-weight: 700;
}

.telemetry-stream {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.stream-item {
  display: flex;
  gap: 10px;
  align-items: baseline;
  line-height: 1.4;
}

.stream-time {
  color: var(--color-blue);
  flex-shrink: 0;
}

.stream-code {
  color: var(--color-gold);
  flex-shrink: 0;
}

.stream-msg {
  color: var(--text-muted);
}

.telemetry-mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.mini-stat-label {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.mini-stat-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}

/* Capability Cards Grid */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.capability-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.capability-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-blue), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.capability-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-blue);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), 0 0 20px var(--color-blue-glow);
}

.capability-card:hover::before {
  opacity: 1;
}

.cap-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-pill);
  border: 1px solid var(--border-active);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--color-blue);
}

.cap-icon svg {
  width: 24px;
  height: 24px;
}

.capability-card h3 {
  font-size: 1.32rem;
  margin-bottom: 12px;
}

.capability-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

.cap-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.cap-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--color-blue);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

/* Interactive System Architecture Blueprint Diagram */
.architecture-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.arch-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.arch-visual-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.arch-layer-node {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.arch-layer-node:hover,
.arch-layer-node.active {
  background: var(--bg-elevated);
  border-color: var(--color-blue);
  transform: translateX(6px);
  box-shadow: 0 4px 16px var(--color-blue-glow);
}

.arch-layer-node.active {
  border-left: 5px solid var(--color-blue);
}

.node-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-gold);
  background: rgba(241, 196, 15, 0.1);
  padding: 4px 8px;
  border-radius: var(--radius-xs);
}

.node-label {
  font-weight: 700;
  font-size: 1.02rem;
}

.node-tech {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
}

.arch-details-panel {
  background: var(--bg-base);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  padding: 30px;
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.panel-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.panel-title {
  font-size: 1.4rem;
  color: var(--color-blue);
  margin-bottom: 6px;
}

.panel-desc {
  color: var(--text-lead);
  font-size: 0.98rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.panel-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.spec-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 10px 14px;
}

.spec-box label {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-transform: uppercase;
}

.spec-box span {
  font-size: 0.88rem;
  font-weight: 600;
  display: block;
  color: var(--text-main);
  margin-top: 2px;
}

/* Case Studies Section */
.case-filter-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  color: var(--text-muted);
  padding: 9px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  color: var(--text-main);
  border-color: var(--color-blue);
}

.filter-btn.active {
  background: var(--color-blue);
  color: #ffffff;
  border-color: var(--color-blue);
  box-shadow: 0 2px 10px var(--color-blue-glow);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  cursor: pointer;
}

.case-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-blue);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.case-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.case-card h3 {
  font-size: 1.25rem;
  line-height: 1.25;
}

.case-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-gold);
  background: rgba(241, 196, 15, 0.1);
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  flex-shrink: 0;
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.case-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-blue);
  background: var(--bg-pill);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.case-problem {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.case-outcome {
  background: var(--bg-elevated);
  border-left: 3px solid var(--color-emerald);
  padding: 10px 14px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin-bottom: 20px;
  font-size: 0.86rem;
  color: var(--text-lead);
}

.case-card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--color-blue);
}

/* Modal for Detailed Case Study Inspection */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 10, 15, 0.85);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  max-width: 840px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  position: relative;
  padding: 40px;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.modal-close-btn:hover {
  background: var(--color-rose);
  color: #fff;
}

/* Scoping Estimator Tool */
.estimator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 42px;
  box-shadow: var(--shadow-md);
}

.estimator-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

.estimator-form-group {
  margin-bottom: 24px;
}

.estimator-label {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.option-pill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.option-checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  transition: var(--transition);
  user-select: none;
}

.option-checkbox-label:hover {
  border-color: var(--color-blue);
}

.option-checkbox-label input:checked + span {
  color: var(--color-blue);
  font-weight: 700;
}

.option-checkbox-label:has(input:checked) {
  border-color: var(--color-blue);
  background: var(--bg-pill);
}

.estimator-summary-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.score-display {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 16px 0;
}

.score-num {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-gold);
}

.score-badge {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(241, 196, 15, 0.15);
  color: var(--color-gold);
}

/* Founder Provenance Section */
.founder-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
}

.founder-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.founder-avatar-wrap {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 24px;
}

.founder-avatar-initials {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border: 3px solid var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  font-weight: 800;
  color: #ffffff;
  box-shadow: 0 0 30px var(--color-blue-glow);
}

.founder-card h3 {
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.founder-title {
  color: var(--color-blue);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

.founder-signature-img {
  max-width: 220px;
  margin: 20px auto 14px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}

[data-theme="light"] .founder-signature-img {
  filter: invert(1) brightness(0.2);
}

.founder-meta-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.meta-row span:first-child {
  color: var(--text-dim);
}

.meta-row span:last-child {
  font-weight: 600;
  color: var(--text-main);
}

/* Timeline */
.timeline-track {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  padding-left: 32px;
  border-left: 2px solid var(--border-card);
  margin-top: 28px;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -39px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-blue);
  border: 3px solid var(--bg-base);
  box-shadow: 0 0 10px var(--color-blue);
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-gold);
}

.timeline-item h4 {
  font-size: 1.15rem;
  margin-top: 4px;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}

.contact-info-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-info-block {
  margin-bottom: 28px;
}

.contact-info-block h3 {
  font-size: 1.45rem;
  margin-bottom: 12px;
}

.contact-info-block p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.channel-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.channel-item:hover {
  border-color: var(--color-blue);
  background: var(--bg-elevated);
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-blue);
  flex-shrink: 0;
}

.channel-icon svg {
  width: 20px;
  height: 20px;
}

.channel-detail label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.channel-detail span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Contact Form */
.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  color: var(--text-main);
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px var(--color-blue-glow);
  outline: none;
}

textarea.form-control {
  min-height: 130px;
  resize: vertical;
}

.form-actions {
  display: flex;
  gap: 14px;
  margin-top: 24px;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--color-emerald);
  color: var(--text-main);
  padding: 14px 22px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 300;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Footer */
footer {
  background: #05080c;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 40px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

[data-theme="light"] footer {
  background: #f1f5f9;
  border-top-color: #e2e8f0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 0.98rem;
  margin-bottom: 18px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.84rem;
}

/* Responsive Breakpoints */
@media (max-width: 1100px) {
  .capabilities-grid,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .hero-grid,
  .arch-layout,
  .estimator-grid,
  .founder-layout,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .nav-links {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .hero-metrics-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .capabilities-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }
  .container {
    width: calc(100% - 32px);
  }
  .hero-metrics-bar {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .form-actions {
    flex-direction: column;
  }
}

/* ==========================================================================
   2026 Strategic Reinvention: Engagement Models & Comparison Matrix
   ========================================================================== */
.engagement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  margin-top: 40px;
}

.engagement-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.engagement-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-blue);
  box-shadow: var(--shadow-lg), 0 0 25px var(--color-blue-glow);
}

.engagement-card.featured {
  border-color: var(--color-gold);
  background: linear-gradient(180deg, rgba(241, 196, 15, 0.05) 0%, var(--bg-card) 40%);
  box-shadow: 0 0 30px var(--color-gold-glow);
}

.engagement-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gold), #d97706);
  color: #0f172a;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.engagement-price {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 16px 0 6px;
  line-height: 1;
}

.engagement-price span {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
}

.engagement-features {
  list-style: none;
  padding: 0;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.engagement-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-lead);
  line-height: 1.45;
}

.engagement-features li svg {
  width: 16px;
  height: 16px;
  color: var(--color-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

/* AI Reality Comparison Matrix */
.reality-matrix-wrap {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-top: 40px;
  box-shadow: var(--shadow-md);
}

.reality-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.reality-table th, .reality-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.reality-table th {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--bg-elevated);
}

.reality-table tr:last-child td {
  border-bottom: 0;
}

.reality-table tr:hover td {
  background: var(--bg-pill);
}

.reality-col-ai {
  color: var(--text-muted);
}

.reality-col-apex {
  color: var(--color-blue);
  font-weight: 600;
}

@media (max-width: 900px) {
  .engagement-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   High-Impact Case Study Detail Pages (Matching Main Site Aesthetic)
   ========================================================================== */
.casehero {
  padding: 80px 0 60px;
  position: relative;
  background: radial-gradient(circle at 50% 0%, rgba(52, 152, 219, 0.14) 0%, transparent 70%);
  border-bottom: 1px solid var(--border-subtle);
}

.breadcrumb {
  margin-bottom: 24px;
}

.breadcrumb a.back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-blue);
  background: var(--bg-pill);
  border: 1px solid var(--border-active);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.breadcrumb a.back:hover {
  transform: translateX(-3px);
  background: var(--color-blue);
  color: #ffffff;
  box-shadow: 0 0 15px var(--color-blue-glow);
}

.casehero h1 {
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1.12;
  margin: 16px 0 20px;
  color: var(--text-main);
  max-width: 950px;
}

.casehero p.lead {
  font-size: 1.2rem;
  color: var(--text-lead);
  max-width: 820px;
  margin-bottom: 32px;
  line-height: 1.6;
}

.meta-infobar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-md), 0 0 20px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(12px);
}

.meta-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.meta-stat strong {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gold);
}

.meta-stat span {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Two-Column Case Layout */
.casebody {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  padding: 60px 0 100px;
  align-items: start;
}

.aside {
  position: sticky;
  top: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.aside strong {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-blue);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 4px;
}

.aside a {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  transition: var(--transition);
  line-height: 1.4;
  border-left: 2px solid transparent;
}

.aside a:hover {
  color: var(--color-blue);
  background: var(--bg-pill);
  border-left-color: var(--color-blue);
  transform: translateX(4px);
}

/* Case Content & Sections */
.casecontent {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.casecontent section {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.casecontent section:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-md), 0 0 20px var(--color-blue-glow);
}

.casecontent h2 {
  font-size: 1.8rem;
  color: var(--text-main);
  margin-bottom: 20px;
  position: relative;
  display: inline-block;
}

.casecontent h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  background: var(--color-blue);
  border-radius: var(--radius-full);
  margin-top: 8px;
}

.casecontent h3 {
  font-size: 1.25rem;
  color: var(--color-gold);
  margin: 28px 0 14px;
}

.casecontent p {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text-lead);
  margin-bottom: 18px;
}

.casecontent p:last-child {
  margin-bottom: 0;
}

.casecontent ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.casecontent li {
  font-size: 0.98rem;
  color: var(--text-lead);
  line-height: 1.6;
}

.casecontent li strong {
  color: var(--text-main);
}

/* Architecture Flow Diagrams in Case Studies */
.diagram-box {
  background: var(--bg-base);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  padding: 30px;
  margin: 28px 0;
  box-shadow: var(--shadow-sm), inset 0 0 20px rgba(0, 0, 0, 0.4);
}

.diagram-flow {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
}

.flow-node {
  background: var(--bg-elevated);
  border: 1px solid var(--border-card);
  border-left: 4px solid var(--color-blue);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flow-node:nth-child(even) {
  border-left-color: var(--color-gold);
}

.flow-arrow {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-blue);
  font-weight: 700;
  padding: 2px 0;
  letter-spacing: 0.05em;
}

/* Tech Stack Grid in Case Studies */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.tech-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tech-card strong {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  color: var(--color-gold);
}

.tech-card span {
  font-size: 0.92rem;
  color: var(--text-lead);
  font-weight: 500;
}

/* Case Study Conversion Callout */
.case-cta-banner {
  background: radial-gradient(circle at 50% 50%, #15273b 0%, var(--bg-surface) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  box-shadow: var(--shadow-glow);
  flex-wrap: wrap;
}

.case-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .casebody {
    grid-template-columns: 1fr;
  }
  .aside {
    position: static;
  }
  .meta-infobar {
    grid-template-columns: repeat(2, 1fr);
  }
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .case-cta-banner {
    flex-direction: column;
    text-align: center;
  }
}