/* 
 * Alpha EXA Main Stylesheet
 * Professional AI Agency WordPress Theme
 * @package AlphaEXA
 */

/* CSS Custom Properties - Design System */
:root {
    /* Core Brand Colors */
    --color-background: hsl(0, 0%, 100%);
    --color-foreground: hsl(224, 71%, 4%);

    /* Primary Brand - Electric Blue */
    --color-primary: hsl(216, 98%, 52%);
    --color-primary-foreground: hsl(0, 0%, 100%);
    --color-primary-light: hsl(216, 95%, 65%);
    --color-primary-dark: hsl(216, 100%, 45%);

    /* Secondary - Tech Purple */
    --color-secondary: hsl(263, 85%, 25%);
    --color-secondary-foreground: hsl(0, 0%, 100%);
    --color-secondary-light: hsl(263, 70%, 35%);

    /* Accent - Vibrant Cyan */
    --color-accent: hsl(189, 94%, 43%);
    --color-accent-foreground: hsl(0, 0%, 100%);

    /* Neutral Grays */
    --color-muted: hsl(220, 14%, 96%);
    --color-muted-foreground: hsl(220, 9%, 46%);
    --color-card: hsl(0, 0%, 100%);
    --color-card-foreground: hsl(224, 71%, 4%);

    /* UI Elements */
    --color-border: hsl(220, 13%, 91%);
    --color-destructive: hsl(0, 84%, 60%);
    --color-destructive-foreground: hsl(0, 0%, 100%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    --gradient-hero: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-subtle: linear-gradient(180deg, var(--color-background) 0%, var(--color-muted) 100%);

    /* Shadows */
    --shadow-primary: 0 10px 30px -10px hsl(216, 98%, 52%, 0.3);
    --shadow-secondary: 0 20px 60px -15px hsl(263, 85%, 25%, 0.4);
    --shadow-soft: 0 4px 20px -2px hsl(220, 13%, 91%, 0.6);
    --shadow-glow: 0 0 40px hsl(216, 95%, 65%, 0.4);

    /* Animations */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
    --section-padding: 6rem 0;
    --border-radius: 0.75rem;
    --border-radius-large: 1.5rem;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: hsl(224, 71%, 4%);
        --color-foreground: hsl(0, 0%, 98%);
        --color-muted: hsl(220, 14%, 11%);
        --color-muted-foreground: hsl(220, 9%, 65%);
        --color-card: hsl(224, 71%, 4%);
        --color-card-foreground: hsl(0, 0%, 98%);
        --color-border: hsl(220, 13%, 15%);
    }
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--color-foreground);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.75rem); }

p {
    margin-bottom: 1rem;
    color: var(--color-muted-foreground);
}

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

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

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

.hero-gradient {
    background: var(--gradient-hero);
}

.section-gradient {
    background: var(--gradient-subtle);
}

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Screen Reader Text */
.screen-reader-text {
    position: absolute !important;
    clip: rect(1px, 1px, 1px, 1px);
    width: 1px !important;
    height: 1px !important;
    overflow: hidden;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: var(--color-primary-foreground);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    text-decoration: none;
    z-index: 100000;
    transition: var(--transition-smooth);
}

.skip-link:focus {
    top: 6px;
}

/* Site Structure */
#page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-main {
    flex: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --section-padding: 4rem 0;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 0.75rem;
        --section-padding: 3rem 0;
    }
}