:root {
    --primary-color: #D4AF37;
    /* Gold */
    --primary-dark: #AA8C2C;
    --secondary-color: #0F172A;
    /* Deep Blue/Black */
    --text-color: #334155;
    --bg-color: #F8FAFC;
    --white: #FFFFFF;
    --light-gray: #E2E8F0;
    --success: #10B981;

    --font-heading: 'Playfair Display', serif;
    --font-body: 'Lato', sans-serif;

    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--secondary-color);
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Typography Helpers */
.highlight {
    color: var(--primary-color);
}

.text-center {
    text-align: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    opacity: 0.9;
}

.btn-outline {
    border-color: var(--white);
    color: var(--white);
    background: transparent;
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--secondary-color);
}

/* Header */
.site-header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    font-weight: 400;
    color: var(--secondary-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.main-nav a.active,
.main-nav a:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
    background-image: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8));
    background-size: cover;
    background-position: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--white);
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    opacity: 0.9;
}

/* Sections */
.section-padding {
    padding: var(--spacing-lg) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.section-header p {
    color: #64748B;
    max-width: 600px;
    margin: 0 auto;
}

/* Featured Causes */
.causes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.cause-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

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

.cause-image {
    height: 200px;
    background-color: var(--light-gray);
    object-fit: cover;
}

.cause-content {
    padding: var(--spacing-md);
}

.cause-content h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.5rem;
}

.progress-bar {
    height: 8px;
    background-color: var(--light-gray);
    border-radius: 4px;
    margin: var(--spacing-sm) 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
}

.cause-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #64748B;
    margin-bottom: var(--spacing-sm);
}

/* Features/How it works */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
}

.feature-item .icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.site-footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding-top: var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-col h3 {
    padding-bottom: 0.5rem;
    color: var(--white);
}

.footer-col h4 {
    color: var(--primary-color);
    font-size: 1rem;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col a:hover {
    color: var(--primary-color);
}

.newsletter-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.newsletter-form input {
    padding: 0.5rem;
    border-radius: 4px;
    border: none;
    flex: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) 0;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
    }

    .main-nav {
        display: none;
    }

    /* TODO: Implement mobile menu toggle */
    .header-actions {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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