/* ============================================
   GDUI — Design System & Styles
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colors — Core */
  --bg-primary: #06080f;
  --bg-secondary: #0b0f1a;
  --bg-tertiary: #111627;
  --bg-card: rgba(17, 22, 39, 0.6);
  --bg-card-hover: rgba(24, 31, 54, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);

  /* Colors — Text */
  --text-primary: #e8eaf0;
  --text-secondary: #8a8fa8;
  --text-tertiary: #555b73;
  --text-white: #ffffff;

  /* Colors — Accent */
  --accent-blue: #6c7bff;
  --accent-purple: #a855f7;
  --accent-magenta: #e040a0;
  --accent-cyan: #38bdf8;
  --accent-blue-dim: rgba(108, 123, 255, 0.15);
  --accent-purple-dim: rgba(168, 85, 247, 0.1);

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #6c7bff 0%, #a855f7 50%, #e040a0 100%);
  --gradient-accent-subtle: linear-gradient(135deg, rgba(108,123,255,0.2) 0%, rgba(168,85,247,0.2) 50%, rgba(224,64,160,0.1) 100%);
  --gradient-bg-section: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  --gradient-bg-reverse: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  --gradient-text: linear-gradient(135deg, #8b9aff 0%, #c084fc 50%, #f472b6 100%);
  --gradient-glow: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(108,123,255,0.06), transparent 40%);

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(108, 123, 255, 0.3);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-6xl: 4.5rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(108, 123, 255, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(108, 123, 255, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
  background: none;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-5xl) 0;
  position: relative;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-blue);
  margin-bottom: var(--space-lg);
  padding: var(--space-xs) var(--space-md);
  background: var(--accent-blue-dim);
  border: 1px solid rgba(108, 123, 255, 0.2);
  border-radius: var(--radius-full);
}

.section-label .dot {
  width: 6px;
  height: 6px;
  background: var(--accent-blue);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-white);
  margin-bottom: var(--space-lg);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }
.reveal-delay-5 { transition-delay: 500ms; }
.reveal-delay-6 { transition-delay: 600ms; }

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(6, 8, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-sm) 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-white);
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: white;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-white);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow-strong);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-accent);
  color: var(--text-white);
}

.btn-lg {
  padding: 14px 32px;
  font-size: var(--font-size-base);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(6, 8, 15, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--text-white);
}

.mobile-close {
  position: absolute;
  top: var(--space-xl);
  right: var(--space-xl);
  font-size: var(--font-size-2xl);
  color: var(--text-secondary);
  cursor: pointer;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

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

/* Radial glow behind hero */
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(108, 123, 255, 0.08) 0%, rgba(168, 85, 247, 0.04) 40%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  padding: 0 var(--space-xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-blue);
  background: var(--accent-blue-dim);
  border: 1px solid rgba(108, 123, 255, 0.2);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2xl);
}

.hero-badge .pulse {
  width: 8px;
  height: 8px;
  background: var(--accent-blue);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero h1 {
  font-size: var(--font-size-6xl);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--text-white);
  margin-bottom: var(--space-xl);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4xl);
  margin-top: var(--space-4xl);
  padding-top: var(--space-3xl);
  border-top: 1px solid var(--border-subtle);
}

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

.hero-stat .number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.03em;
}

.hero-stat .label {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

/* ============================================
   PROBLEM SECTION
   ============================================ */
.problem {
  background: var(--gradient-bg-section);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.problem-visual {
  position: relative;
}

.problem-card-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.problem-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateX(8px);
}

.problem-card .icon {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.problem-card h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-sm);
}

.problem-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   WHAT GDUI DOES
   ============================================ */
.solution {
  background: var(--gradient-bg-reverse);
}

.solution-center {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.solution-center .section-subtitle {
  margin: 0 auto;
}

.solution-diagram {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

.diagram-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: var(--space-lg);
}

.diagram-node {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
  position: relative;
}

.diagram-node:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.diagram-node.active {
  border-color: var(--accent-blue);
  background: linear-gradient(135deg, rgba(108,123,255,0.1), rgba(168,85,247,0.05));
}

.diagram-node .node-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.diagram-node h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-sm);
}

.diagram-node p {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: 1.5;
}

.diagram-arrow {
  color: var(--accent-blue);
  font-size: var(--font-size-xl);
  opacity: 0.5;
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-it-works {
  background: var(--bg-primary);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2xl);
  margin-top: var(--space-3xl);
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.step-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.step-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  font-size: var(--font-size-sm);
  font-weight: 800;
  margin-bottom: var(--space-xl);
}

.step-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-md);
}

.step-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-card .step-visual {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.step-card .step-visual code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: var(--font-size-xs);
  color: var(--accent-blue);
  line-height: 1.8;
}

/* ============================================
   USE CASES
   ============================================ */
.use-cases {
  background: var(--gradient-bg-section);
}

.use-cases-center {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.use-cases-center .section-subtitle {
  margin: 0 auto;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.use-case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  cursor: default;
}

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

.use-case-icon {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  display: block;
}

.use-case-card h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-sm);
}

.use-case-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   FOR DEVELOPERS
   ============================================ */
.developers {
  background: var(--gradient-bg-reverse);
}

.dev-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-4xl);
  align-items: center;
}

.code-window {
  background: #0d1117;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.code-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-dot:nth-child(1) { background: #ff5f57; }
.code-dot:nth-child(2) { background: #febc2e; }
.code-dot:nth-child(3) { background: #28c840; }

.code-filename {
  margin-left: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.code-body {
  padding: var(--space-xl);
  overflow-x: auto;
}

.code-body pre {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.code-body .keyword { color: #ff7b72; }
.code-body .function { color: #d2a8ff; }
.code-body .string { color: #a5d6ff; }
.code-body .comment { color: #484f58; }
.code-body .property { color: #79c0ff; }
.code-body .punctuation { color: #8b949e; }

.dev-benefits {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.dev-benefit {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.dev-benefit-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue-dim);
  border-radius: var(--radius-md);
  font-size: 1.2rem;
}

.dev-benefit h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-xs);
}

.dev-benefit p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   PLATFORMS
   ============================================ */
.platforms {
  background: var(--bg-primary);
}

.platforms-center {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.platforms-center .section-subtitle {
  margin: 0 auto;
}

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

.platform-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.platform-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.platform-item .platform-icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-md);
}

.platform-item span {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

/* ============================================
   PRICING (Coming Soon)
   ============================================ */
.pricing {
  background: var(--gradient-bg-section);
}

.pricing-center {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.pricing-center .section-subtitle {
  margin: 0 auto;
}

.pricing-coming-soon {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-4xl) var(--space-2xl);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
}

.pricing-coming-soon .icon {
  font-size: 3rem;
  margin-bottom: var(--space-xl);
}

.pricing-coming-soon h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-md);
}

.pricing-coming-soon p {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  background: var(--gradient-bg-reverse);
}

.faq-center {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.faq-center .section-subtitle {
  margin: 0 auto;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(108, 123, 255, 0.15);
}

.faq-item.active {
  border-color: var(--border-accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--text-white);
}

.faq-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-blue);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 var(--space-xl) var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   WAITLIST / CTA
   ============================================ */
.waitlist {
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.waitlist::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108, 123, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.waitlist-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 620px;
  margin: 0 auto;
}

.waitlist-content h2 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

.waitlist-content > p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.waitlist-form {
  display: flex;
  gap: var(--space-md);
  max-width: 480px;
  margin: 0 auto;
}

.waitlist-input {
  flex: 1;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
}

.waitlist-input::placeholder {
  color: var(--text-tertiary);
}

.waitlist-input:focus {
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px rgba(108, 123, 255, 0.1);
}

.waitlist-success {
  display: none;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
  color: #34d399;
  font-weight: 500;
}

.waitlist-success.show {
  display: flex;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  line-height: 1.7;
  margin-top: var(--space-md);
  max-width: 280px;
}

.footer-col h5 {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.footer-col a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--text-white);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-subtle);
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.footer-socials {
  display: flex;
  gap: var(--space-md);
}

.footer-socials a {
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.footer-socials a:hover {
  color: var(--text-white);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: var(--font-size-5xl);
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .steps-grid,
  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dev-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .diagram-flow {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .diagram-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 768px) {
  :root {
    --space-5xl: 5rem;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero h1 {
    font-size: var(--font-size-4xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .steps-grid,
  .use-cases-grid {
    grid-template-columns: 1fr;
  }

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

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .waitlist-form {
    flex-direction: column;
  }

  .waitlist-form .btn {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn {
    width: 100%;
  }
}