/* ============================================
   DESIGN SYSTEM - CSS CUSTOM PROPERTIES
   ============================================ */

:root {
  /* Color Palette - Vibrant Gradients */
  --color-primary: #8b5cf6;
  --color-primary-dark: #7c3aed;
  --color-secondary: #3b82f6;
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-error: #ef4444;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-hero: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #1e3a8a 100%);
  --gradient-card: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
  
  /* Neutral Colors */
  --color-bg-dark: #0f172a;
  --color-bg-card: rgba(30, 41, 59, 0.5);
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.875rem;
  --font-size-sm: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  --font-size-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.4);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

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

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--gradient-hero);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-3xl);
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-2xl);
}

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

p {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--spacing-2xl) 0;
}

/* Animated background elements */
.hero-section::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
  top: -250px;
  right: -250px;
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

.hero-section::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
  bottom: -200px;
  left: -200px;
  border-radius: 50%;
  animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(50px, 50px) scale(1.1);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
}

/* ============================================
   GLASSMORPHISM CARD
   ============================================ */

.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(139, 92, 246, 0.3);
}

/* ============================================
   FORM STYLES
   ============================================ */

.signup-form {
  margin-top: var(--spacing-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.form-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.input-wrapper {
  position: relative;
  flex: 1;
}

.email-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-md);
  font-family: var(--font-family);
  background: rgba(15, 23, 42, 0.6);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  outline: none;
  transition: all var(--transition-normal);
}

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

.email-input:focus {
  border-color: var(--color-primary);
  background: rgba(15, 23, 42, 0.8);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
}

.email-input.error {
  border-color: var(--color-error);
}

.email-input.success {
  border-color: var(--color-success);
}

/* ============================================
   BUTTON STYLES
   ============================================ */

.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-md);
  font-weight: 600;
  font-family: var(--font-family);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

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

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ============================================
   FEATURES SECTION
   ============================================ */

.features-section {
  padding: var(--spacing-2xl) 0;
  position: relative;
  z-index: 1;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 12px 40px rgba(139, 92, 246, 0.3);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

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

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

/* ============================================
   MESSAGES
   ============================================ */

.message {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: center;
  animation: slideIn var(--transition-normal);
  display: none;
}

.message.show {
  display: block;
}

.message-success {
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.message-error {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   HERO IMAGE
   ============================================ */

.hero-image {
  margin: var(--spacing-xl) auto;
  max-width: 600px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glow);
  animation: fadeInUp 1s ease-out;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 768px) {
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  h2 {
    font-size: var(--font-size-xl);
  }
  
  .form-group {
    flex-direction: column;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-section::before,
  .hero-section::after {
    width: 300px;
    height: 300px;
  }
  
  .glass-card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--font-size-xl);
  }
  
  p {
    font-size: var(--font-size-sm);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}

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

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

.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); }

.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); }

.hidden {
  display: none;
}