/* ============================================
   SMARTLEADS - DESIGN SYSTEM & GLOBAL STYLES
   ============================================ */

/* CSS Custom Properties */
:root {
  /* Dark Theme Colors */
  --color-bg-primary: #0A0E1A;
  --color-bg-secondary: #111827;
  --color-bg-tertiary: #1A1F2E;

  /* Gradient Backgrounds */
  --color-gradient-dark: linear-gradient(135deg, #0A0E1A 0%, #1A1F2E 50%, #111827 100%);
  --color-gradient-darker: linear-gradient(180deg, #0A0E1A 0%, #050810 100%);

  /* Accent Colors - Modern Tech-Forward */
  --color-accent-cyan: #06B6D4;
  --color-accent-blue: #3B82F6;
  --color-accent-purple: #8B5CF6;
  --color-accent-teal: #14B8A6;
  --color-accent-pink: #EC4899;

  /* Neon Glow Colors */
  --color-glow-cyan: rgba(6, 182, 212, 0.4);
  --color-glow-blue: rgba(59, 130, 246, 0.4);
  --color-glow-purple: rgba(139, 92, 246, 0.4);

  /* Text Colors */
  --color-text-primary: #F8FAFC;
  --color-text-secondary: #CBD5E1;
  --color-text-muted: #94A3B8;
  --color-text-dark: #0F172A;

  /* Glass Effect Variables */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-bg-hover: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #06B6D4 0%, #3B82F6 50%, #8B5CF6 100%);
  --gradient-accent: linear-gradient(135deg, #14B8A6 0%, #06B6D4 100%);
  --gradient-glow: linear-gradient(135deg, rgba(6, 182, 212, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --spacing-5xl: 8rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Container */
  --container-max-width: 1280px;
  --container-padding: 1.5rem;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-secondary);
  background: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ============================================
   UTILITY CLASSES
   ============================================ */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-5xl) 0;
}

.section-dark {
  background: var(--color-gradient-dark);
  color: var(--color-text-primary);
  position: relative;
}

.section-dark::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-glow);
  opacity: 0.3;
  pointer-events: none;
}

.section-dark>* {
  position: relative;
  z-index: 1;
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
  color: var(--color-text-primary);
}

.section-light {
  background: var(--color-bg-secondary);
}

.section-gray {
  background: var(--color-bg-tertiary);
}

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

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

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mb-2xl {
  margin-bottom: var(--spacing-2xl);
}

.mb-3xl {
  margin-bottom: var(--spacing-3xl);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mt-2xl {
  margin-top: var(--spacing-2xl);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 0 20px var(--color-glow-cyan);
  border: 1px solid var(--glass-border);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--color-glow-blue), 0 10px 25px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--color-accent-cyan);
  border: 2px solid var(--color-accent-cyan);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--glass-bg-hover);
  color: var(--color-text-primary);
  border-color: var(--color-accent-blue);
  transform: translateY(-2px);
  box-shadow: 0 0 20px var(--color-glow-cyan);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-3xl);
  font-size: var(--font-size-lg);
}

.btn-group {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ============================================
   NAVBAR
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-base);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--container-padding);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.navbar-logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: white;
  text-decoration: none;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-2xl);
  align-items: center;
}

.navbar-menu a {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.navbar-menu a:hover {
  color: var(--color-accent-cyan);
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: var(--font-size-2xl);
  cursor: pointer;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: var(--color-gradient-darker);
  color: var(--color-text-primary);
  padding: calc(var(--spacing-5xl) + 80px) 0 var(--spacing-5xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(6,182,212,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-glow-cyan) 0%, transparent 70%);
  opacity: 0.15;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  font-size: var(--font-size-6xl);
  color: white;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
  text-shadow: 0 0 40px var(--color-glow-cyan);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3xl);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   CARDS & GRID LAYOUTS
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-2xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-8px);
  background: var(--glass-bg-hover);
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 30px var(--color-glow-cyan), var(--glass-shadow);
}

.card-dark {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.card-dark:hover {
  background: var(--glass-bg-hover);
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 25px var(--color-glow-cyan);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 0 20px var(--color-glow-cyan);
}

.card h3 {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.card p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-dark p {
  color: var(--color-text-secondary);
}

/* ============================================
   TIMELINE (How It Works)
   ============================================ */

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline-item {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.timeline-number {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: white;
  box-shadow: 0 0 30px var(--color-glow-cyan);
  border: 2px solid var(--glass-border);
}

.timeline-content h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.timeline-content p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-gradient-darker);
  color: var(--color-text-secondary);
  padding: var(--spacing-4xl) 0 var(--spacing-xl) 0;
  border-top: 1px solid var(--glass-border);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-primary);
  opacity: 0.5;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-column h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-delay-1 {
  animation-delay: 0.1s;
}

.animate-delay-2 {
  animation-delay: 0.2s;
}

.animate-delay-3 {
  animation-delay: 0.3s;
}

.animate-delay-4 {
  animation-delay: 0.4s;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  :root {
    --font-size-6xl: 2.5rem;
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --spacing-5xl: 4rem;
    --container-padding: 1rem;
  }

  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    flex-direction: column;
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .navbar-menu.active {
    transform: translateX(0);
  }

  .navbar-toggle {
    display: block;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group .btn {
    width: 100%;
  }

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

  .timeline-item {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: var(--font-size-4xl);
  }

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