/**
 * Galactic EA AI - Main Styles
 * Modern CSS with CSS Variables, optimized for performance
 * Compatible with modern browsers (CSS Grid, Flexbox, Custom Properties)
 */

/* ================================================================
   CSS CUSTOM PROPERTIES (Variables)
   ================================================================ */
:root {
    /* Colors */
    --color-primary: #7b77c6;
    --color-secondary: #ff77c6;
    --color-accent: #00d4ff;
    --color-bg-primary: #000000;
    --color-bg-secondary: #0a0a1a;
    --color-bg-tertiary: #1a0a2e;
    --color-bg-quaternary: #16213e;
    --color-bg-quinary: #0f3460;
    --color-text-primary: #ffffff;
    --color-text-secondary: #e0e7ff;
    --color-text-muted: #888;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(123, 119, 198, 0.2);
    --shadow-md: 0 4px 15px rgba(123, 119, 198, 0.4);
    --shadow-lg: 0 10px 30px rgba(255, 119, 198, 0.6);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Z-index layers */
    --z-base: 0;
    --z-sticky: 100;
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
    
    /* Container */
    --container-max-width: 1400px;
    --container-padding: clamp(1rem, 4vw, 2.5rem);
}

/* ================================================================
   RESET & BASE STYLES
   ================================================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg-primary);
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 119, 198, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 25%, var(--color-bg-quaternary) 50%, var(--color-bg-quinary) 75%, var(--color-bg-secondary) 100%);
    background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%;
    background-attachment: fixed;
    color: var(--color-text-primary);
    line-height: 1.6;
    padding: 0;
    margin: 0;
    position: relative;
    overflow-x: hidden;
    min-height: 100vh;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: 
        radial-gradient(2px 2px at 20% 30%, #fff, transparent),
        radial-gradient(2px 2px at 60% 70%, #fff, transparent),
        radial-gradient(1px 1px at 50% 50%, #fff, transparent),
        radial-gradient(1px 1px at 80% 10%, #fff, transparent),
        radial-gradient(2px 2px at 90% 40%, #fff, transparent),
        radial-gradient(1px 1px at 33% 60%, #fff, transparent),
        radial-gradient(1px 1px at 10% 80%, #fff, transparent);
    background-size: 200% 200%;
    background-position: 0% 0%, 100% 0%, 50% 50%, 0% 100%, 100% 100%, 50% 0%, 0% 50%;
    animation: stars 20s linear infinite;
    pointer-events: none;
    z-index: var(--z-base);
    opacity: 0.6;
    will-change: transform;
}

@keyframes stars {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-50%, -50%); }
}

/* ================================================================
   CONTAINER & LAYOUT
   ================================================================ */
.container {
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
    padding-block: var(--spacing-xl);
}

/* ================================================================
   TYPOGRAPHY
   ================================================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 { 
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl)); 
}

h2 { 
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-3xl)); 
    margin-top: var(--spacing-xl);
}

h3 { 
    font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-2xl)); 
    margin-top: var(--spacing-lg);
}

h4 { 
    font-size: clamp(var(--font-size-lg), 2vw, var(--font-size-xl)); 
}

p { 
    margin-bottom: var(--spacing-md); 
}

/* ================================================================
   LINKS
   ================================================================ */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base), text-shadow var(--transition-base);
    text-shadow: 0 0 10px rgba(123, 119, 198, 0.5);
}

a:hover,
a:focus-visible {
    color: var(--color-secondary);
    text-decoration: underline;
    text-shadow: 0 0 15px rgba(255, 119, 198, 0.8);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ================================================================
   CODE BLOCKS
   ================================================================ */
code {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 0.9em;
}

pre {
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border-inline-start: 4px solid var(--color-accent);
}

pre code {
    background: none;
    padding: 0;
}

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    background-size: 200% 200%;
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-md);
    animation: gradientShift 3s ease infinite;
    will-change: transform, box-shadow;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    animation-duration: 1s;
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* ================================================================
   SCROLLBAR (Modern Styling)
   ================================================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-quaternary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-sm);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-secondary), var(--color-accent));
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-bg-quaternary);
}

/* ================================================================
   RESPONSIVE DESIGN
   ================================================================ */
@media (max-width: 768px) {
    :root {
        --container-padding: clamp(0.75rem, 3vw, 1.5rem);
    }
    
    .container {
        padding-block: var(--spacing-lg);
    }
}

@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;
    }
}

/* ================================================================
   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-width: 0;
}

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