/* Unified Theme System - Based on Gabriel's Digital Ecosystem Design */
:root {
  /* Core Dark Theme Colors */
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-surface: #334155;
  --bg-elevated: #1A202C;
  --bg-card: #1E293B;
  
  /* Text Colors */
  --text-primary: #FFFFFF;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-inverse: #0F172A;
  
  /* Accent Colors */
  --accent-primary: #3B82F6;
  --accent-hover: #2563EB;
  --accent-active: #1D4ED8;
  --accent-bright: #60A5FA;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --accent-border: rgba(59, 130, 246, 0.2);
  
  /* Multi-color Accent System (for buttons/icons) */
  --accent-purple: #9333EA;
  --accent-pink: #EC4899;
  --accent-orange: #F97316;
  --accent-green: #22C55E;
  --accent-cyan: #06B6D4;
  
  /* Blue Button Palette */
  --btn-primary-bg: linear-gradient(135deg, #3B82F6, #2563EB);
  --btn-primary-hover: linear-gradient(135deg, #2563EB, #3B82F6);
  --btn-primary-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  --btn-primary-hover-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
  --btn-primary-border: rgba(59, 130, 246, 0.3);
  
  /* Border Colors */
  --border-primary: #334155;
  --border-secondary: #475569;
  --border-light: rgba(148, 163, 184, 0.2);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #3B82F6, #2563EB);
  --gradient-secondary: linear-gradient(135deg, #2563EB, #3B82F6);
  --gradient-tertiary: linear-gradient(135deg, #60A5FA, #3B82F6);
  --gradient-bg: linear-gradient(180deg, #0F172A, #1E293B);
  --gradient-card: linear-gradient(145deg, #1E293B, #0F172A);
  --gradient-surface: linear-gradient(145deg, #334155, #1E293B);
  --gradient-hero: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(37, 99, 235, 0.05));
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.3);
  --shadow-glow-hover: 0 0 25px rgba(59, 130, 246, 0.4);
  --shadow-button: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-button-hover: 0 10px 15px rgba(0, 0, 0, 0.15);
  
  /* Glassmorphism Effects */
  --glass-blur: blur(12px);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.02);
  
  /* Typography */
  --font-sans: 'Poppins', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 50%;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Theme */
:root.light {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-surface: #E5E5E5;
  --bg-elevated: #F0F0F0;
  --bg-card: #FFFFFF;
  
  --text-primary: #000000;
  --text-secondary: #333333;
  --text-muted: #666666;
  --text-inverse: #FFFFFF;
  
  --border-primary: #D0D0D0;
  --border-secondary: #C0C0C0;
  --border-light: rgba(128, 128, 128, 0.2);
  
  --gradient-bg: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.08), transparent 50%), linear-gradient(180deg, #FFFFFF, #F5F5F5);
  --gradient-card: linear-gradient(145deg, #FFFFFF, #F8F9FA);
  --gradient-surface: linear-gradient(145deg, #F5F5F5, #E5E5E5);
  
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.2);
  --shadow-glow-hover: 0 0 25px rgba(59, 130, 246, 0.3);
  
  --btn-primary-bg: linear-gradient(135deg, #3B82F6, #2563EB);
  --btn-primary-hover: linear-gradient(135deg, #2563EB, #3B82F6);
  --btn-primary-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  --btn-primary-hover-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
  --btn-primary-border: rgba(59, 130, 246, 0.3);
  
  --text-shadow-primary: 0 1px 2px rgba(0, 0, 0, 0.1);
  --text-shadow-secondary: 0 1px 1px rgba(0, 0, 0, 0.05);
  --text-shadow-heading: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Global Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background: var(--gradient-bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: all var(--transition-slow);
  overflow-x: hidden;
  text-shadow: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  text-shadow: none;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--text-primary);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  text-shadow: none;
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  font-family: var(--font-sans);
  color: #ffffff;
  background: var(--btn-primary-bg);
  box-shadow: var(--btn-primary-shadow);
  backdrop-filter: blur(10px);
}

.btn:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--btn-primary-hover-shadow);
  border-color: var(--btn-primary-border);
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: #ffffff;
  box-shadow: var(--btn-primary-shadow);
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  box-shadow: var(--btn-primary-hover-shadow);
}

.btn-secondary {
  background: rgba(59, 130, 246, 0.1);
  color: #ffffff;
  border: 2px solid rgba(59, 130, 246, 0.3);
  backdrop-filter: blur(15px);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.1);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.6);
  color: #3B82F6;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
}

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

.btn-tertiary:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* Multi-color buttons for specific actions */
.btn-purple {
  background: var(--accent-purple);
  color: var(--text-primary);
}

.btn-purple:hover {
  background: #7C3AED;
  transform: translateY(-2px);
}

.btn-pink {
  background: var(--accent-pink);
  color: var(--text-primary);
}

.btn-pink:hover {
  background: #DB2777;
  transform: translateY(-2px);
}

.btn-orange {
  background: var(--accent-orange);
  color: var(--text-primary);
}

.btn-orange:hover {
  background: #EA580C;
  transform: translateY(-2px);
}

.btn-cyan {
  background: var(--accent-cyan);
  color: var(--text-primary);
}

.btn-cyan:hover {
  background: #0891B2;
  transform: translateY(-2px);
}

.btn-green {
  background: var(--accent-green);
  color: var(--text-primary);
}

.btn-green:hover {
  background: #16A34A;
  transform: translateY(-2px);
}

/* Card System */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Form Elements */
input, textarea, select {
  width: 100%;
  padding: var(--space-sm);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: all var(--transition-normal);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  position: relative;
  text-shadow: none;
}

.nav-link:hover {
  color: var(--accent-primary);
  background: var(--accent-subtle);
  transform: translateY(-1px);
  text-shadow: none;
}

.nav-link.active {
  color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.15);
}

/* Header/Topbar */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-blur);
}

.header h1 {
  margin: 0;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  text-shadow: none;
}

/* Footer */
.footer {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: var(--space-lg);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.fade-in {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .btn {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.9rem;
  }
  
  .card {
    padding: var(--space-md);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

.btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Light Mode Styles */
body.light {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;
  --bg-card: #ffffff;
  
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #6a6a6a;
  --text-inverse: #f3f4f6;
  
  --gradient-bg: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.05), transparent 50%), linear-gradient(180deg, #ffffff, #f8fafc);
  --gradient-card: linear-gradient(145deg, #ffffff, #f1f5f9);
  --gradient-surface: linear-gradient(145deg, #f8fafc, #ffffff);
  --gradient-hero: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(37, 99, 235, 0.05));
  
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-active: #1d4ed8;
  --accent-bright: #60a5fa;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --accent-border: rgba(59, 130, 246, 0.2);
  
  --border-primary: #e5e7eb;
  --border-secondary: #d1d5db;
  --border-light: rgba(209, 213, 219, 0.2);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
  --shadow-glow-hover: 0 0 30px rgba(59, 130, 246, 0.4);
}

body.light .card {
  background: var(--gradient-card);
  border: 1px solid var(--border-primary);
  box-shadow: var(--shadow-md);
}

body.light .btn-primary {
  background: var(--btn-primary-bg);
  color: white;
  border-color: var(--btn-primary-border);
  box-shadow: var(--btn-primary-shadow);
}

body.light .btn-primary:hover {
  background: var(--btn-primary-hover);
  box-shadow: var(--btn-primary-hover-shadow);
}

body.light .btn-secondary {
  color: var(--text-primary);
  border-color: var(--accent-border);
}

body.light .btn-secondary:hover {
  background: var(--accent-subtle);
  color: var(--text-primary);
  border-color: var(--accent-hover);
}