/* ==========================================================================
   DECODE DATA - MODERN DATA PLATFORM THEME
   A cutting-edge design system for data practitioners
   ========================================================================== */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================================================== */

:root {
  /* ===== Color Palette - "Data Nexus" (Dark Theme - Default) ===== */

  /* Primary Background Colors */
  --color-deep-space: #1a2332;
  --color-dark-navy: #242d3e;
  --color-slate: #2e3a4d;
  --color-slate-light: #3a4759;

  /* Brand Gradient Colors */
  --color-electric-blue: #0066FF;
  --color-bright-cyan: #00D4FF;
  --color-cyber-cyan: #00F5FF;

  /* Accent Colors */
  --color-neon-purple: #B24BF3;
  --color-hot-pink: #E94CE6;
  --color-matrix-green: #00F5A0;
  --color-sunset-orange: #FF6B35;

  /* Semantic Colors */
  --color-success: #00F5A0;
  --color-warning: #FFB020;
  --color-danger: #FF4757;
  --color-info: #00D4FF;

  /* Text Colors */
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B4B9C6;
  --color-text-muted: #6B7280;
  --color-text-inverse: #0A0E27;

  /* Data Visualization Spectrum */
  --color-viz-1: #667EEA;
  --color-viz-2: #764BA2;
  --color-viz-3: #F093FB;
  --color-viz-4: #4FACFE;
  --color-viz-5: #00F2FE;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-electric-blue) 0%, var(--color-bright-cyan) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-neon-purple) 0%, var(--color-hot-pink) 100%);
  --gradient-success: linear-gradient(135deg, #00F5A0 0%, #00D4A1 100%);
  --gradient-warm: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
  --gradient-cosmic: linear-gradient(135deg, #667EEA 0%, #764BA2 50%, #E94CE6 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);

  /* Glassmorphism */
  --glass-bg: rgba(46, 58, 77, 0.75);
  --glass-bg-light: rgba(58, 71, 89, 0.65);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.25);

  /* Shadows & Elevation */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.25);
  --shadow-neon: 0 0 20px rgba(0, 212, 255, 0.4);
  --shadow-glow: 0 0 30px rgba(178, 75, 243, 0.5);

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-code: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */

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

  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */

  /* Border Radius */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index Scale */
  --z-base: 1;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ==========================================================================
   LIGHT THEME
   ========================================================================== */

[data-theme="light"] {
  /* Primary Background Colors */
  --color-deep-space: #f8fafc;
  --color-dark-navy: #f1f5f9;
  --color-slate: #e2e8f0;
  --color-slate-light: #cbd5e1;

  /* Text Colors */
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #FFFFFF;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-bg-light: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(0, 0, 0, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);

  /* Shadows & Elevation */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
}

/* Light theme adjustments for buttons on gradients */
[data-theme="light"] .btn-hero-primary,
[data-theme="light"] .btn-signup,
[data-theme="light"] .btn-primary-modern,
[data-theme="light"] .btn-accent-modern,
[data-theme="light"] .step-number,
[data-theme="light"] .feature-icon {
  color: #FFFFFF !important;
}

/* Ensure navbar dropdown is visible in both themes */
[data-theme="light"] .navbar .dropdown-menu {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 0, 0, 0.15);
}

/* Light theme navigation adjustments */
[data-theme="light"] .navbar,
[data-theme="light"] .glass-nav {
  background: rgba(255, 255, 255, 0.9) !important;
  border-bottom-color: rgba(0, 0, 0, 0.1);
}

/* Ensure CTA section text is visible on gradient backgrounds */
[data-theme="light"] .cta-section .cta-title,
[data-theme="light"] .cta-section .cta-content,
[data-theme="light"] .cta-section .btn-hero-primary {
  color: #FFFFFF !important;
}

/* ==========================================================================
   GLOBAL STYLES
   ========================================================================== */

/* Universal Reset - Ensures no default margins/padding */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--color-deep-space);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
}

/* Ensure all headings use theme-aware colors */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
}

/* Ensure paragraphs and spans use theme-aware colors */
p, span, div {
  color: inherit;
}

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

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

/* ==========================================================================
   GLASSMORPHISM COMPONENTS
   ========================================================================== */

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

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl), var(--shadow-neon);
  border-color: rgba(0, 212, 255, 0.3);
}

.glass-card-light {
  background: var(--glass-bg-light);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

.glass-nav {
  background: rgba(26, 35, 50, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

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

.btn-primary-modern {
  background: var(--gradient-primary);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.btn-primary-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

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

.btn-primary-modern:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(0, 102, 255, 0.4);
}

.btn-accent-modern {
  background: var(--gradient-accent);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.btn-accent-modern:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(178, 75, 243, 0.5);
}

.btn-outline-modern {
  background: transparent;
  color: var(--color-bright-cyan);
  border: 2px solid var(--color-bright-cyan);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-outline-modern::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transform: translate(-50%, -50%);
  transition: width var(--transition-base), height var(--transition-base);
  z-index: -1;
}

.btn-outline-modern:hover::before {
  width: 120%;
  height: 300%;
}

.btn-outline-modern:hover {
  color: white;
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

.btn-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--color-text-primary);
  border: 1px solid var(--glass-border);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-glass:hover {
  background: var(--glass-bg-light);
  border-color: var(--color-cyber-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
}

/* ==========================================================================
   NEON EFFECTS
   ========================================================================== */

.neon-border {
  border: 2px solid var(--color-cyber-cyan);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.5),
              inset 0 0 10px rgba(0, 245, 255, 0.2);
}

.neon-glow {
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.6);
}

.neon-text {
  color: var(--color-cyber-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.8);
}

/* ==========================================================================
   MODERN CARDS & CONTAINERS
   ========================================================================== */

.modern-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

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

.modern-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-xl), 0 0 30px rgba(0, 102, 255, 0.2);
}

.hero-section {
  background: linear-gradient(135deg, var(--color-deep-space) 0%, var(--color-dark-navy) 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(0, 102, 255, 0.1) 0%, transparent 70%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

/* ==========================================================================
   FORM ELEMENTS
   ========================================================================== */

.modern-input {
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
  width: 100%;
}

.modern-input:focus {
  outline: none;
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1), 0 0 20px rgba(0, 212, 255, 0.3);
  background: rgba(30, 41, 59, 0.9);
}

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

.form-label-modern {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-2);
  display: block;
}

/* ==========================================================================
   BADGES & STATUS INDICATORS
   ========================================================================== */

.badge-modern {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success {
  background: rgba(0, 245, 160, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(0, 245, 160, 0.3);
}

.badge-warning {
  background: rgba(255, 176, 32, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(255, 176, 32, 0.3);
}

.badge-info {
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-info);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.badge-danger {
  background: rgba(255, 71, 87, 0.15);
  color: var(--color-danger);
  border: 1px solid rgba(255, 71, 87, 0.3);
}

.badge-new {
  background: var(--gradient-accent);
  color: white;
  animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px rgba(178, 75, 243, 0.5); }
  50% { box-shadow: 0 0 20px rgba(178, 75, 243, 0.8); }
}

/* ==========================================================================
   PROGRESS BARS
   ========================================================================== */

.progress-modern {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  height: 10px;
  overflow: hidden;
  position: relative;
}

.progress-bar-modern {
  background: var(--gradient-primary);
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.progress-bar-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ==========================================================================
   CODE BLOCKS
   ========================================================================== */

.code-block-modern {
  background: rgba(26, 35, 50, 0.9);
  border: 1px solid var(--glass-border);
  border-left: 3px solid var(--color-electric-blue);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  font-family: var(--font-code);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  overflow-x: auto;
  position: relative;
}

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

/* ==========================================================================
   NAVIGATION ENHANCEMENTS
   ========================================================================== */

.nav-link-modern {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  font-weight: var(--font-weight-medium);
}

.nav-link-modern::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link-modern:hover {
  color: var(--color-bright-cyan);
}

.nav-link-modern:hover::after {
  width: 80%;
}

.nav-link-modern.active {
  color: var(--color-bright-cyan);
  background: rgba(0, 212, 255, 0.1);
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.5s ease-out;
}

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

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

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

.bg-gradient-primary {
  background: var(--gradient-primary);
}

.bg-gradient-accent {
  background: var(--gradient-accent);
}

.bg-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.border-neon {
  border-color: var(--color-cyber-cyan);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.shadow-neon {
  box-shadow: var(--shadow-neon);
}

.shadow-glow {
  box-shadow: var(--shadow-glow);
}

/* ==========================================================================
   RESPONSIVE UTILITIES
   ========================================================================== */

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }

  .glass-card {
    padding: var(--space-4);
  }

  .modern-card {
    padding: var(--space-4);
  }
}

/* ==========================================================================
   DARK THEME OPTIMIZATIONS
   ========================================================================== */

::selection {
  background: rgba(0, 212, 255, 0.3);
  color: white;
}

::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-deep-space);
}

::-webkit-scrollbar-thumb {
  background: var(--glass-bg);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-deep-space);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-bg-light);
}

/* ==========================================================================
   THEME TOGGLE BUTTON
   ========================================================================== */

.theme-toggle {
  position: relative;
  width: 60px;
  height: 30px;
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  padding: 2px;
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  border-color: var(--color-bright-cyan);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
}

.theme-toggle-slider {
  position: absolute;
  width: 22px;
  height: 22px;
  background: var(--gradient-primary);
  border-radius: 50%;
  transition: transform var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  box-shadow: var(--shadow-md);
  left: 3px;
}

[data-theme="light"] .theme-toggle-slider {
  transform: translateX(28px);
  background: var(--gradient-warm);
}

.theme-toggle-icon {
  font-size: 14px;
  line-height: 1;
}

.theme-toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}