/* CSS Variables */
:root {
/* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #f1f5f9;
    --accent-color: #3b82f6;
    --text-color: #1e293b;
    --light-text: #64748b;
    --link-color: #2563eb;
    --hover-color: #dbeafe;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --white: #ffffff;
    --surface-color: #ffffff;
    --surface-hover: #f8fafc;
    --overlay-light: rgba(255, 255, 255, 0.9);
    --overlay-dark: rgba(0, 0, 0, 0.1);

    /* Gradients */
    --gradient: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    --hover-gradient: linear-gradient(135deg, var(--primary-dark), var(--primary-color));

    /* Shadows */
    --card-shadow: 
        0 1px 3px 0 rgb(0 0 0 / 0.1),
        0 1px 2px -1px rgb(0 0 0 / 0.1);
    --hover-shadow: 
        0 10px 15px -3px rgb(0 0 0 / 0.1),
        0 4px 6px -4px rgb(0 0 0 / 0.1);
    --text-shadow: 0 1px 2px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --border-radius-sm: 0.5rem;
    --border-radius: 0.75rem;
    --border-radius-lg: 1rem;
    --border-radius-full: 9999px;

    /* Spacing */
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 1.75rem;
    --spacing-xl: 2.5rem;
    --spacing-2xl: 3.5rem;

/* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-index */
    --z-nav: 100;
    --z-overlay: 200;
    --z-modal: 300;
    --z-max: 999;
}

/* Reset & Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: var(--spacing-lg);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background: linear-gradient(to bottom, #f8fafc, #f1f5f9);
    min-height: 100vh;
    overflow-y: scroll; /* Prevent layout shift from scrollbar */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.page-wrapper {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--light-text);
    font-size: 1.125rem;
    line-height: 1.8;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    z-index: var(--z-max);
    transition: top var(--transition-normal);
    border-radius: var(--border-radius-sm);
}

.skip-link:focus {
    top: var(--spacing-xs);
}

/* Header */
.site-header {
    background: var(--gradient);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.header-content {
    position: relative;
    z-index: var(--z-nav);
}

.header-background {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.1;
}

.site-header h1 {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-xs);
    text-shadow: var(--text-shadow);
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    max-width: 550px;
    margin: 0 auto;
}

/* Navigation */
.main-nav {
    background: var(--overlay-light);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px); /* Safari support */
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    margin-bottom: var(--spacing-md);
    position: sticky;
    top: var(--spacing-xs);
    z-index: var(--z-nav);
    transition: transform var(--transition-normal), 
                box-shadow var(--transition-normal),
                background-color var(--transition-normal);
    will-change: transform, box-shadow, background-color;
}

.main-nav.nav-hidden {
    transform: translateY(-100%);
}

.main-nav:hover {
    box-shadow: var(--hover-shadow);
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-full);
    transition: color var(--transition-normal),
                background-color var(--transition-normal),
                transform var(--transition-normal);
    position: relative;
    overflow: hidden;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.main-nav a::before {
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 1.1rem;
}

.main-nav a[href="index.html"]::before {
    content: '\f015'; /* home */
}

.main-nav a[href="threats.html"]::before {
    content: '\f071'; /* exclamation-triangle */
}

.main-nav a[href="best-practices.html"]::before {
    content: '\f058'; /* check-circle */
}

.main-nav a[href="resources.html"]::before {
    content: '\f02d'; /* book */
}

.main-nav a[href="activities.html"]::before {
    content: '\f11b'; /* gamepad */
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
    background: var(--hover-color);
    transform: translateY(-2px);
}

.main-nav a.active {
    background: var(--gradient);
    color: var(--white);
    box-shadow: var(--card-shadow);
}

/* Footer */
.site-footer {
    background: var(--surface-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--hover-color);
    color: var(--light-text);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    color: var(--light-text);
}

.footer-nav {
    margin-top: var(--spacing-md);
}

.footer-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin: 0;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-normal);
    opacity: 0.8;
}

.footer-nav a:hover {
    color: var(--primary-color);
    opacity: 1;
}

/* Utility Components */
.fab {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--border-radius-full);
    background: var(--gradient);
    color: var(--white);
    border: none;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--hover-shadow);
    transition: transform var(--transition-normal),
                background var(--transition-normal),
                box-shadow var(--transition-normal);
    will-change: transform;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    outline: none;
    overflow: hidden;
}

.fab i {
    font-size: 1.2rem;
    transition: transform var(--transition-normal);
}

.fab:hover i {
    transform: translateY(-2px);
}

.fab:focus-visible {
    box-shadow: 0 0 0 3px var(--primary-color);
}

.fab:hover {
    transform: translateY(-3px);
    background: var(--hover-gradient);
}

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient);
    transform-origin: 0 50%;
    transform: scaleX(0);
    z-index: var(--z-overlay);
    transition: transform var(--transition-normal);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    html { 
        font-size: 14px; 
    }
    
    .site-header {
        padding: var(--spacing-xl) var(--spacing-md);
        margin: var(--spacing-sm) 0;
    }

    .site-header h1 {
        font-size: 2.5rem;
    }

    .main-nav {
        margin: 0 0 var(--spacing-md);
    }

    .footer-nav ul {
        gap: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .main-nav,
    .fab,
    .scroll-progress,
    .footer-nav {
        display: none !important;
    }

    body {
        background: none;
        color: black;
    }

    .site-header,
    .site-footer {
        background: none;
        color: black;
        box-shadow: none;
    }

    .site-header h1 {
        color: black;
        text-shadow: none;
    }

    a {
        text-decoration: underline;
        color: black;
    }

    @page {
        margin: 2cm;
    }
}

/* Mobile Styles */
@media (max-width: 480px) {
    html { 
        font-size: 13px; 
    }

    .site-header {
        padding: var(--spacing-lg) var(--spacing-sm);
        margin: var(--spacing-sm) 0;
    }

    .site-header h1 {
        font-size: 2rem;
    }

    .main-nav {
        position: sticky;
        top: 0;
        margin: 0;
        border-radius: 0;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
    }

    .main-nav a {
        display: block;
        text-align: center;
        padding: var(--spacing-sm);
    }

    .fab {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 3rem;
        height: 3rem;
    }

    .footer-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000EE;
        --text-color: #000000;
        --light-text: #333333;
        --hover-color: #DDDDDD;
    }

    .site-header,
    .site-footer {
        background: var(--primary-color);
    }

    .main-nav a.active {
        background: var(--primary-color);
        outline: 2px solid var(--text-color);
    }
}