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

:root {
  --bg: #fafafa;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f5f7;
  --bg-alt: #f0f0f5;
  --border: #e2e2e8;
  --text: #3a3a4a;
  --text-muted: #6b6b80;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: rgba(79, 70, 229, 0.08);
  --heading: #111118;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1120px;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

img {
  max-width: 100%;
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 { transition-delay: 0.05s; }
.stagger-2 { transition-delay: 0.1s; }
.stagger-3 { transition-delay: 0.15s; }
.stagger-4 { transition-delay: 0.2s; }
.stagger-5 { transition-delay: 0.25s; }
.stagger-6 { transition-delay: 0.3s; }

/* ===== Typography ===== */
h1, h2, h3, h4 {
  color: var(--heading);
  line-height: 1.2;
  font-weight: 600;
}

h1 { font-size: 3rem; letter-spacing: -0.03em; }
h2 { font-size: 2rem; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 6rem 0;
}

section + section {
  border-top: 1px solid var(--border);
}

.section-alt {
  background: var(--bg-alt);
}

/* ===== Navigation ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  animation: fadeIn 0.5s ease;
  transition: background 0.3s, border-color 0.3s;
}

nav.nav-transparent {
  background: rgba(255, 255, 255, 0.6);
  border-bottom-color: transparent;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--heading);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--heading);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: var(--font);
  transition: all 0.25s ease;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ===== Hero ===== */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  animation: fadeUp 0.8s ease;
}

.hero-3d {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background: #ffffff;
  padding: 0;
}

.hero-3d + section {
  border-top: none;
}

.hero-3d #hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-3d .container {
  position: relative;
  z-index: 1;
  text-align: left;
  display: flex;
  align-items: flex-end;
  min-height: 100vh;
  padding-bottom: 5rem;
  pointer-events: none;
}

.hero-3d .hero-text {
  pointer-events: auto;
  max-width: 560px;
}

.hero-3d .label {
  color: var(--accent);
}

.hero-3d h1 {
  color: var(--heading);
  margin: 0 0 1.5rem;
}

.hero-3d p {
  color: var(--text-muted);
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
}

.hero-3d .hero-buttons {
  justify-content: flex-start;
}

.hero h1 {
  max-width: 800px;
  margin: 0 auto 1.5rem;
}

.hero p {
  max-width: 620px;
  margin: 0 auto 2.5rem;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Cards Grid ===== */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: #d0d0da;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

.card h3 {
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent);
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.card:hover .card-icon {
  transform: scale(1.1);
}

/* ===== Section Headers ===== */
.section-header {
  max-width: 660px;
  margin-bottom: 3rem;
}

.section-header.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-header p {
  margin-top: 1rem;
  color: var(--text-muted);
}

.label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* ===== Body Text ===== */
.body-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
  max-width: 680px;
}

/* ===== Stats ===== */
.stats {
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
}

.stat {
  transition: transform 0.3s ease;
}

.stat:hover {
  transform: translateY(-2px);
}

.stat h3 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* ===== Tech Stack ===== */
.tech-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.tech-tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.25s ease;
}

.tech-tag:hover {
  background: var(--accent);
  color: #ffffff;
}

/* ===== Use Case Cards ===== */
.use-case {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
  transition: all 0.3s ease;
}

.use-case:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.08);
  transform: translateY(-2px);
}

.use-case-complexity {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.complexity-simple {
  background: #ecfdf5;
  color: #059669;
}

.complexity-moderate {
  background: #eff6ff;
  color: #2563eb;
}

.complexity-complex {
  background: #fef3c7;
  color: #d97706;
}

.complexity-advanced {
  background: #fce7f3;
  color: #db2777;
}

.use-case h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.use-case p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.use-case .tech-strip {
  margin-top: 1rem;
}

.use-case .tech-tag {
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
}

/* ===== Persona Callout ===== */
.persona-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2.5rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.persona-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.4s ease;
  transform-origin: left;
}

.persona-card:hover::before {
  transform: scaleX(1);
}

.persona-card:hover {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.persona-role {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

.persona-card h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.persona-card p {
  color: var(--text-muted);
  font-size: 0.925rem;
  margin-bottom: 0.75rem;
}

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

/* ===== Inline Callout ===== */
.callout {
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  transition: all 0.3s ease;
}

.callout:hover {
  background: rgba(79, 70, 229, 0.12);
}

.callout p {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
}

/* ===== Case Study ===== */
.case-study {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3rem;
  margin-bottom: 2rem;
  transition: box-shadow 0.3s ease;
}

.case-study:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.case-study h3 {
  font-size: 1.35rem;
  margin-bottom: 1.5rem;
}

.case-study h4 {
  color: var(--accent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.case-study p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

.case-study ul {
  list-style: none;
  margin-top: 0.5rem;
}

.case-study ul li {
  color: var(--text);
  padding: 0.35rem 0;
  font-size: 0.925rem;
}

.case-study ul li::before {
  content: "\2192 ";
  color: var(--accent);
  margin-right: 0.5rem;
}

/* ===== Safeguards List ===== */
.safeguards {
  list-style: none;
}

.safeguards li {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.3s ease;
}

.safeguards li:hover {
  padding-left: 0.5rem;
}

.safeguards li:last-child {
  border-bottom: none;
}

.safeguards li strong {
  color: var(--heading);
  display: block;
  margin-bottom: 0.35rem;
}

.safeguards li span {
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* ===== Numbered Steps ===== */
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1rem;
  transition: transform 0.3s ease;
}

.card:hover .step-number {
  transform: scale(1.15);
}

/* ===== Forms ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  color: var(--heading);
  font-size: 0.9rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ===== ROI Calculator ===== */
.calculator {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3rem;
}

.calculator .form-grid {
  margin-bottom: 1.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.result-card {
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
}

.result-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.result-card-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.result-card-value.compact {
  font-size: 1.5rem;
}

.result-card--neutral {
  background: var(--bg-alt);
}

.result-card--neutral .result-card-label { color: var(--text-muted); }
.result-card--neutral .result-card-value { color: var(--heading); }

.result-card--positive {
  background: #ecfdf5;
}

.result-card--positive .result-card-label { color: #059669; }
.result-card--positive .result-card-value { color: #059669; }

/* ===== Nav CTA ===== */
.nav-cta {
  background: var(--accent);
  color: #ffffff !important;
  padding: 0.4rem 1rem;
  border-radius: 5px;
  font-weight: 600;
  transition: all 0.25s ease !important;
}

.nav-cta:hover {
  background: var(--accent-hover);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

/* ===== Bottom CTA ===== */
.bottom-cta {
  padding: 5rem 0;
  border-top: none !important;
}

/* ===== Divider ===== */
.section-no-border + section {
  border-top: none;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

footer p {
  color: var(--text-muted);
  font-size: 0.825rem;
}

footer .footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

footer .footer-links a {
  color: var(--text-muted);
  font-size: 0.825rem;
  transition: color 0.2s;
}

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

/* ===== Scene Sections (Three.js backgrounds) ===== */
.scene-section {
  position: relative;
  overflow: hidden;
}
.scene-section canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.scene-section > .container {
  position: relative;
  z-index: 1;
}

/* ===== Grid Background ===== */
.grid-bg {
  position: relative;
  overflow: hidden;
}
.grid-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(209, 213, 228, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(209, 213, 228, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}
.grid-bg > .container {
  position: relative;
  z-index: 1;
}

/* ===== Node Popup (Hero 3D) ===== */
.node-popup {
  position: absolute;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  width: 300px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(79, 70, 229, 0.08);
  pointer-events: auto;
  opacity: 0;
  transform: translateY(8px) scale(0.96);
  transition: opacity 0.25s ease, transform 0.25s ease;
  display: none;
}

.node-popup.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  display: block;
}

.node-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.node-popup-step {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.node-popup-status {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  background: #ecfdf5;
  color: #059669;
}

.node-popup h4 {
  font-size: 0.95rem;
  color: var(--heading);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.node-popup-body {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.node-popup-body .popup-row {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px solid rgba(226, 226, 232, 0.5);
}

.node-popup-body .popup-row:last-child {
  border-bottom: none;
}

.node-popup-body .popup-label {
  color: var(--text-muted);
}

.node-popup-body .popup-value {
  color: var(--heading);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.node-popup-body .popup-value.highlight {
  color: #059669;
}

.node-popup-body .popup-divider {
  height: 1px;
  background: var(--border);
  margin: 0.5rem 0;
}

.node-popup-body .popup-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.4rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 { font-size: 2.15rem; }
  h2 { font-size: 1.6rem; }
  section { padding: 4rem 0; }
  .hero { padding: 8rem 0 4rem; }

  .hero-3d {
    min-height: 100vh;
  }

  .hero-3d .container {
    padding-bottom: 3rem;
  }

  .hero-3d .hero-text {
    max-width: none;
  }

  .hero-3d h1 {
    font-size: 2.15rem;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .result-card-value {
    font-size: 1.5rem;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .stats {
    gap: 2rem;
  }

  .tech-strip {
    gap: 0.5rem;
  }

  .case-study {
    padding: 2rem;
  }

  .persona-card {
    padding: 2rem;
  }

  .node-popup {
    width: 260px;
    padding: 1rem 1.25rem;
  }

  footer .container {
    flex-direction: column;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero {
    animation: none;
  }
  nav {
    animation: none;
  }
  .card, .btn, .use-case, .persona-card, .stat, .card-icon, .step-number, .safeguards li {
    transition: none;
  }
  .persona-card::before {
    transition: none;
  }
}