:root {
  /* Brand palette — vibrant, professional */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-accent: #ec4899;
  --color-accent-dark: #db2777;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --grad-accent: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
  --grad-success: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --grad-mesh: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
               radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.15) 0%, transparent 40%);

  /* Neutrals */
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-elev: #334155;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-border: #334155;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Scale */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.35);

  --nav-height: 72px;
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; }

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

/* Selection */
::selection { background: rgba(99, 102, 241, 0.4); color: var(--color-text); }

/* Gradient text utility */
.text-gradient {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glass card */
.glass {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Section padding */
.section { padding: 100px 24px; }
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 60px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Gradient button */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}
.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(99, 102, 241, 0.5);
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Utility */
.container { max-width: 1100px; margin: 0 auto; }
.grid { display: grid; gap: 24px; }
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-400 { transition-delay: 400ms; }

@media (max-width: 1024px) {
  .hero-image {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section { padding: 60px 16px; }
  .hero-image {
    margin-top: 40px;
  }
  .image-card {
    aspect-ratio: 16/9;
  }
}