/* --- CSS Variables & Theming --- */
:root {
    /* Color Palette - Professional, Trustworthy, Modern */
    --clr-primary: #0056b3; /* Trustworthy blue */
    --clr-primary-dark: #004494;
    --clr-secondary: #ff9800; /* Energetic action orange */
    --clr-secondary-dark: #e68a00;
    
    --clr-text-main: #333333;
    --clr-text-muted: #666666;
    --clr-bg-light: #f8f9fa;
    --clr-bg-white: #ffffff;
    --clr-bg-dark: #222222;
    --clr-text-light: #f4f4f4;

    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Effects */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --border-radius: 8px;
    --transition-speed: 0.3s;
}

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

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

body {
    font-family: var(--font-family-base);
    color: var(--clr-text-main);
    background-color: var(--clr-bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed) ease;
}

ul, ol {
    list-style: none;
}

/* --- Layout Utilities --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

section {
    padding: var(--spacing-lg) 0;
}

/* --- Components --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease, transform 0.2s ease, box-shadow var(--transition-speed) ease;
    border: none;
    text-align: center;
}

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

.btn-primary {
    background-color: var(--clr-primary);
    color: var(--clr-bg-white);
}

.btn-primary:hover {
    background-color: var(--clr-primary-dark);
}

.btn-secondary {
    background-color: var(--clr-bg-white);
    color: var(--clr-primary);
    border: 2px solid var(--clr-primary);
}

.btn-secondary:hover {
    background-color: var(--clr-bg-light);
}

.btn-outline {
    background-color: transparent;
    color: var(--clr-text-main);
    border: 1px solid #ccc;
}

.btn-outline:hover, .btn-outline:focus {
    border-color: var(--clr-primary);
    color: var(--clr-primary);
    background-color: rgba(0, 86, 179, 0.05);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
    display: block;
}

/* --- Navigation (Sticky) --- */
.site-header {
    background-color: var(--clr-bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.brand-logo .logo-text {
    font-size: var(--font-size-lg);
    font-weight: 800;
    color: var(--clr-primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Mobile-first: hide links except donate */
.nav-links li:not(:last-child) {
    display: none;
}

.nav-links a:not(.btn) {
    font-weight: 500;
    color: var(--clr-text-main);
}

.nav-links a:not(.btn):hover {
    color: var(--clr-primary);
}

/* --- Hero Section --- */
.hero-section {
    background-color: var(--clr-primary-dark);
    /* Background image setup */
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../assets/images/AOYWO logo red in eagle (1).png');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    color: var(--clr-text-light);
    padding: var(--spacing-xl) 0;
    text-align: center;
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-section h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    line-height: 1.1;
}

.hero-section p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.hero-ctas {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

/* --- About Section --- */
.about-section {
    background-color: var(--clr-bg-white);
}

.about-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xxl);
    color: var(--clr-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.about-text p {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
    color: var(--clr-text-muted);
}

.image-wrapper {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* --- Impact Section --- */
.impact-section {
    background-color: var(--clr-bg-light);
    text-align: center;
}

.impact-section h2 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xxl);
    color: var(--clr-primary);
}

.impact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.impact-card {
    background-color: var(--clr-bg-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed) ease;
}

.impact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.impact-card h3 {
    font-size: 2.5rem;
    color: var(--clr-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 800;
}

/* --- Donate Section (CTA) --- */
.donate-section {
    background-color: var(--clr-primary);
    color: var(--clr-text-light);
    text-align: center;
}

.donate-section h2 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-xs);
}

.donate-section p.subtitle {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.donation-card {
    background-color: var(--clr-bg-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    max-width: 500px;
    margin: 0 auto;
    color: var(--clr-text-main);
    box-shadow: var(--shadow-lg);
}

.donation-amounts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--clr-bg-dark);
    color: var(--clr-text-light);
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.footer-brand .logo-text {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--clr-bg-white);
    display: block;
    margin-bottom: var(--spacing-xs);
}

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

.footer-links a:hover {
    color: var(--clr-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: var(--font-size-sm);
    color: #999;
}

/* --- Animation Classes (Interaction Designer Setup) --- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}


/* ==========================================================================
   Responsive Breakpoints (Desktop Upscaling)
   ========================================================================== */

@media (min-width: 768px) {
    /* Typography adjustments */
    :root {
        --font-size-xxl: 2.5rem;
    }

    /* Header Nav */
    .brand-logo .logo-text {
        font-size: var(--font-size-xl);
    }
    
    .nav-links li:not(:last-child) {
        display: block; /* Reveal regular links */
    }

    .nav-links {
        gap: var(--spacing-md);
    }

    /* Hero Section */
    .hero-ctas {
        flex-direction: row;
    }

    /* About Section */
    .about-content {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }

    /* Impact Section */
    .impact-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr 1fr;
        text-align: left;
        align-items: center;
    }

    .footer-links ul {
        flex-direction: row;
        justify-content: flex-end;
    }
}