:root {
    /* Primary Colors (Emerald Tech) */
    --color-primary-50: #ecfdf5;
    --color-primary-100: #d1fae5;
    --color-primary-200: #a7f3d0;
    --color-primary-300: #6ee7b7;
    --color-primary-400: #34d399;
    --color-primary-500: #10b981;
    --color-primary-600: #059669;
    --color-primary-700: #047857;
    --color-primary-800: #065f46;
    --color-primary-900: #064e3b;

    /* Accent Colors (Teal) */
    --color-accent-50: #f0fdfa;
    --color-accent-100: #ccfbf1;
    --color-accent-200: #99f6e4;
    --color-accent-300: #5eead4;
    --color-accent-400: #2dd4bf;
    --color-accent-500: #14b8a6;
    --color-accent-600: #0d9488;
    --color-accent-700: #0f766e;
    --color-accent-800: #115e59;
    --color-accent-900: #134e4a;

    /* Dark Mode Colors (Slate) */
    --color-dark-50: #f8fafc;
    --color-dark-100: #f1f5f9;
    --color-dark-200: #e2e8f0;
    --color-dark-300: #cbd5e1;
    --color-dark-400: #94a3b8;
    --color-dark-500: #64748b;
    --color-dark-600: #475569;
    --color-dark-700: #334155;
    --color-dark-800: #1e293b;
    --color-dark-900: #0f172a;
    --color-dark-950: #020617;

    /* Status Colors */
    --color-success-50: #f0fdf4;
    --color-success-500: #22c55e;
    --color-success-600: #16a34a;
    --color-success-700: #15803d;

    --color-warning-50: #fffbeb;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;

    --color-error-50: #fef2f2;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;
    --color-error-700: #b91c1c;

    --color-info-50: #eff6ff;
    --color-info-500: #3b82f6;
    --color-info-600: #2563eb;
    --color-info-700: #1d4ed8;

    /* Legacy Color Palettes for Compatibility */
    --palette-orange: #ff8c42;
    --palette-orange-dark: #ff7a33;
    --palette-orange-light: #ffa366;
    
    --palette-blue: #4285f4;
    --palette-blue-dark: #3367d6;
    --palette-blue-light: #669df6;
    
    --palette-purple: #9c27b0;
    --palette-purple-dark: #7b1fa2;
    --palette-purple-light: #ba68c8;
    
    --palette-green: #065f46;
    --palette-green-dark: #064e3b;
    --palette-green-light: #047857;
    
    --palette-red: #ea4335;
    --palette-red-dark: #d32f2f;
    --palette-red-light: #ef5350;

    /* Active Color Palette (Default: Emerald) */
    --primary: var(--color-primary-500);
    --primary-dark: var(--color-primary-600);
    --primary-light: var(--color-primary-400);
    --primary-gradient: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-accent-500) 100%);
    
    --secondary: var(--color-accent-500);
    --secondary-dark: var(--color-accent-600);
    --secondary-light: var(--color-accent-400);
    --secondary-gradient: linear-gradient(135deg, var(--color-accent-500) 0%, var(--color-accent-600) 100%);
    
    --accent: var(--color-accent-600);
    --accent-dark: var(--color-accent-700);
    --accent-light: var(--color-accent-500);
    --accent-gradient: linear-gradient(135deg, var(--color-accent-600) 0%, var(--color-accent-700) 100%);
    
    /* Neutral Colors (Light Mode) */
    --background: #ffffff;
    --surface: #ffffff;
    --surface-hover: var(--color-primary-50);
    --surface-elevated: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.8);
    
    --text-primary: var(--color-dark-900);
    --text-secondary: var(--color-dark-600);
    --text-tertiary: var(--color-dark-500);
    --text-disabled: var(--color-dark-400);
    
    --border: var(--color-dark-200);
    --border-hover: var(--color-dark-300);
    --divider: var(--color-dark-100);

    /* Dark Mode Colors */
    --dark-background: var(--color-dark-950);
    --dark-surface: var(--color-dark-900);
    --dark-surface-hover: var(--color-dark-800);
    --dark-surface-elevated: var(--color-dark-800);
    --dark-surface-glass: rgba(15, 23, 42, 0.8);
    
    --dark-text-primary: var(--color-dark-50);
    --dark-text-secondary: var(--color-dark-300);
    --dark-text-tertiary: var(--color-dark-400);
    --dark-text-disabled: var(--color-dark-500);
    
    --dark-border: var(--color-dark-700);
    --dark-border-hover: var(--color-dark-600);
    --dark-divider: var(--color-dark-800);

    /* Status Colors */
    --success: var(--color-success-500);
    --success-bg: var(--color-success-50);
    --warning: var(--color-warning-500);
    --warning-bg: var(--color-warning-50);
    --error: var(--color-error-500);
    --error-bg: var(--color-error-50);
    --info: var(--color-info-500);
    --info-bg: var(--color-info-50);

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    /* Fluid Typography Scale */
    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
    --font-size-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.5rem);
    --font-size-4xl: clamp(2.25rem, 1.8rem + 2vw, 3rem);
    --font-size-5xl: clamp(3rem, 2.4rem + 3vw, 4rem);
    --font-size-6xl: clamp(3.75rem, 3rem + 3.75vw, 5rem);

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Font Weights */
    --font-weight-thin: 100;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    --font-weight-black: 900;

    /* Spacing Scale */
    --spacing-px: 1px;
    --spacing-0: 0;
    --spacing-1: clamp(0.25rem, 0.2rem + 0.25vw, 0.375rem);
    --spacing-2: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
    --spacing-3: clamp(0.75rem, 0.6rem + 0.75vw, 1rem);
    --spacing-4: clamp(1rem, 0.8rem + 1vw, 1.25rem);
    --spacing-5: clamp(1.25rem, 1rem + 1.25vw, 1.5rem);
    --spacing-6: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
    --spacing-8: clamp(2rem, 1.6rem + 2vw, 2.5rem);
    --spacing-10: clamp(2.5rem, 2rem + 2.5vw, 3rem);
    --spacing-12: clamp(3rem, 2.4rem + 3vw, 4rem);
    --spacing-16: clamp(4rem, 3.2rem + 4vw, 5rem);
    --spacing-20: clamp(5rem, 4rem + 5vw, 6rem);
    --spacing-24: clamp(6rem, 4.8rem + 6vw, 8rem);
    --spacing-32: clamp(8rem, 6.4rem + 8vw, 10rem);

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    --radius-base: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-base: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-2xl: 0 50px 100px -20px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

    /* Glass Effect Shadows */
    --shadow-glass: 0 8px 32px 0 rgba(16, 185, 129, 0.1);
    --shadow-glass-lg: 0 20px 40px 0 rgba(16, 185, 129, 0.15);

    /* Transitions */
    --transition-none: none;
    --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-spring: 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* Z-index Scale */
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-auto: auto;

    /* Breakpoints */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;

    /* Animation Durations */
    --duration-75: 75ms;
    --duration-100: 100ms;
    --duration-150: 150ms;
    --duration-200: 200ms;
    --duration-300: 300ms;
    --duration-500: 500ms;
    --duration-700: 700ms;
    --duration-1000: 1000ms;

    /* Blur */
    --blur-none: 0;
    --blur-sm: 4px;
    --blur-base: 8px;
    --blur-md: 12px;
    --blur-lg: 16px;
    --blur-xl: 24px;
    --blur-2xl: 40px;
    --blur-3xl: 64px;
}

/* Color Palette Classes */
.palette-orange {
    --primary: var(--palette-orange);
    --primary-dark: var(--palette-orange-dark);
    --primary-light: var(--palette-orange-light);
    --primary-gradient: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.palette-blue {
    --primary: var(--palette-blue);
    --primary-dark: var(--palette-blue-dark);
    --primary-light: var(--palette-blue-light);
    --primary-gradient: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.palette-purple {
    --primary: var(--palette-purple);
    --primary-dark: var(--palette-purple-dark);
    --primary-light: var(--palette-purple-light);
    --primary-gradient: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.palette-green {
    --primary: var(--color-primary-500);
    --primary-dark: var(--color-primary-600);
    --primary-light: var(--color-primary-400);
    --primary-gradient: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-accent-500) 100%);
    --secondary: var(--color-accent-500);
    --secondary-dark: var(--color-accent-600);
    --secondary-light: var(--color-accent-400);
    --accent: var(--color-accent-600);
    --accent-dark: var(--color-accent-700);
    --accent-light: var(--color-accent-500);
}

.palette-red {
    --primary: var(--palette-red);
    --primary-dark: var(--palette-red-dark);
    --primary-light: var(--palette-red-light);
    --primary-gradient: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

/* Dark Mode */
[data-theme="dark"] {
    --background: var(--dark-background);
    --surface: var(--dark-surface);
    --surface-hover: var(--dark-surface-hover);
    --surface-elevated: var(--dark-surface-elevated);
    --surface-glass: var(--dark-surface-glass);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-tertiary: var(--dark-text-tertiary);
    --text-disabled: var(--dark-text-disabled);
    --border: var(--dark-border);
    --border-hover: var(--dark-border-hover);
    --divider: var(--dark-divider);
}

[data-theme="light"] {
    --background: #ffffff;
    --surface: #ffffff;
    --surface-hover: var(--color-primary-50);
    --surface-elevated: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.8);
    --text-primary: var(--color-dark-900);
    --text-secondary: var(--color-dark-600);
    --text-tertiary: var(--color-dark-500);
    --text-disabled: var(--color-dark-400);
    --border: var(--color-dark-200);
    --border-hover: var(--color-dark-300);
    --divider: var(--color-dark-100);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

body.loaded {
    transition: all var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
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-4);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

/* Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-all);
    position: relative;
}

a:hover {
    color: var(--primary-dark);
}

a:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

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

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

.btn-secondary {
    background: var(--surface);
    color: var(--primary);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--primary);
}

.btn-ghost:hover {
    background: var(--surface-hover);
}

/* Glass Effect Components */
.glass-effect {
    background: var(--surface-glass);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-glass);
}

.glass-card {
    background: var(--surface-glass);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-glass);
    transition: var(--transition-all);
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glass-lg);
    border-color: var(--border-hover);
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

/* Grid System */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Responsive Grid */
@media (max-width: 1024px) {
    .grid-cols-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
    .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .grid-cols-2, .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

/* Status Message Components */
.alert {
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    border: 1px solid;
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.alert-success {
    background: var(--success-bg);
    color: var(--color-success-700);
    border-color: var(--color-success-200);
}

.alert-warning {
    background: var(--warning-bg);
    color: var(--color-warning-700);
    border-color: var(--color-warning-200);
}

.alert-error {
    background: var(--error-bg);
    color: var(--color-error-700);
    border-color: var(--color-error-200);
}

.alert-info {
    background: var(--info-bg);
    color: var(--color-info-700);
    border-color: var(--color-info-200);
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

.font-thin { font-weight: var(--font-weight-thin); }
.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

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

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes scaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(16, 185, 129, 0.3); }
    50% { box-shadow: 0 0 40px rgba(16, 185, 129, 0.6); }
}

.animate-fade-in { animation: fadeIn 0.6s ease-out; }
.animate-slide-in { animation: slideIn 0.5s ease-out; }
.animate-scale-in { animation: scaleIn 0.4s ease-out; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-glow { animation: glow 2s ease-in-out infinite; }

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Focus Management */
.focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

/* Form Error States */
.error {
    border-color: var(--error) !important;
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1) !important;
}

.error-message {
    color: var(--error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
    display: block;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .reduced-motion * {
        animation: none !important;
        transition: none !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --text-secondary: var(--text-primary);
    }
}

/* Print Styles */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a, a:visited {
        text-decoration: underline;
    }
    
    .no-print {
        display: none !important;
    }
}