/**
 * Ultra-Modern Design System
 * Advanced CSS Variables & Design Tokens
 */

:root {
    /* === COLORS === */
    /* Primary Palette */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    --primary-950: #172554;

    /* Neutral Palette */
    --neutral-0: #ffffff;
    --neutral-50: #f9fafb;
    --neutral-100: #f3f4f6;
    --neutral-200: #e5e7eb;
    --neutral-300: #d1d5db;
    --neutral-400: #9ca3af;
    --neutral-500: #6b7280;
    --neutral-600: #4b5563;
    --neutral-700: #374151;
    --neutral-800: #1f2937;
    --neutral-900: #111827;
    --neutral-950: #0f0f23;

    /* Accent Colors */
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --accent-purple: #8b5cf6;

    /* === GRADIENTS === */
    --gradient-primary: linear-gradient(135deg, var(--primary-600) 0%, var(--accent-cyan) 100%);
    --gradient-dark: linear-gradient(135deg, var(--neutral-900) 0%, var(--neutral-800) 50%, var(--primary-900) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    --gradient-hero: linear-gradient(135deg, var(--neutral-950) 0%, var(--neutral-900) 25%, var(--primary-900) 75%, var(--accent-cyan) 100%);

    /* === TYPOGRAPHY === */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-display: 'Clash Display', 'Inter', sans-serif;
    --font-family-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg: 1.125rem;    /* 18px */
    --text-xl: 1.25rem;     /* 20px */
    --text-2xl: 1.5rem;     /* 24px */
    --text-3xl: 1.875rem;   /* 30px */
    --text-4xl: 2.25rem;    /* 36px */
    --text-5xl: 3rem;       /* 48px */
    --text-6xl: 3.75rem;    /* 60px */
    --text-7xl: 4.5rem;     /* 72px */
    --text-8xl: 6rem;       /* 96px */
    --text-9xl: 8rem;       /* 128px */

    /* Font Weights */
    --font-thin: 100;
    --font-extralight: 200;
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    --font-black: 900;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* === SPACING === */
    --space-px: 1px;
    --space-0: 0;
    --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 */
    --space-24: 6rem;       /* 96px */
    --space-32: 8rem;       /* 128px */
    --space-40: 10rem;      /* 160px */
    --space-48: 12rem;      /* 192px */
    --space-56: 14rem;      /* 224px */
    --space-64: 16rem;      /* 256px */

    /* === BORDERS === */
    --border-radius-none: 0;
    --border-radius-sm: 0.25rem;    /* 4px */
    --border-radius-md: 0.375rem;   /* 6px */
    --border-radius-lg: 0.5rem;     /* 8px */
    --border-radius-xl: 0.75rem;    /* 12px */
    --border-radius-2xl: 1rem;      /* 16px */
    --border-radius-3xl: 1.5rem;    /* 24px */
    --border-radius-full: 9999px;

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

    /* Ultra-Modern Shadows */
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.1), 0 1px 0 0 rgba(255, 255, 255, 0.05) inset;
    --shadow-neon: 0 0 20px var(--primary-500), 0 0 40px var(--primary-600), 0 0 60px var(--primary-700);
    --shadow-cyber: 0 0 1px var(--accent-cyan), 0 0 10px var(--accent-cyan), 0 0 20px var(--accent-cyan);

    /* === TRANSITIONS === */
    --transition-none: none;
    --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 300ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-bounce: all 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Custom Easing */
    --easing-in-out-cubic: cubic-bezier(0.65, 0, 0.35, 1);
    --easing-in-out-quart: cubic-bezier(0.76, 0, 0.24, 1);
    --easing-in-out-expo: cubic-bezier(0.87, 0, 0.13, 1);

    /* === Z-INDEX === */
    --z-auto: auto;
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;

    /* === BREAKPOINTS (for reference) === */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
    --bp-2xl: 1536px;
}

/* === GLOBAL RESETS === */

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

html {
    line-height: var(--leading-normal);
    -webkit-text-size-adjust: 100%;
    -moz-tab-size: 4;
    tab-size: 4;
    font-family: var(--font-family-sans);
    font-feature-settings: normal;
    font-variation-settings: normal;
    scroll-behavior: smooth;
}

body {
    background-color: var(--neutral-950);
    color: var(--neutral-100);
    font-family: var(--font-family-sans);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

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

.text-glow {
    text-shadow: 0 0 20px currentColor;
}

/* Animations */
@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes slide-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Animation Classes */
.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

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

.animate-fade-in {
    animation: fade-in 0.5s ease-out;
}

/* Glass Effect */
.glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Button Base Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: var(--leading-none);
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-base);
    white-space: nowrap;
    user-select: none;
}

.btn:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--neutral-200);
    border: 1px solid var(--neutral-600);
}

.btn-secondary:hover {
    background: var(--neutral-800);
    border-color: var(--primary-500);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: var(--neutral-300);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* Size variants */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Responsive utilities */
.hidden {
    display: none;
}

@media (max-width: 767px) {
    .hidden-mobile {
        display: none !important;
    }
}

@media (min-width: 768px) {
    .hidden-desktop {
        display: none !important;
    }
}

/* Accessibility */
.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;
}

/* Performance */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

.transform-gpu {
    transform: translateZ(0);
}