:root {
    --primary-gradient: linear-gradient(135deg, #d32f2f 0%, #b71c1c 100%);
    --secondary-color: #f44336;
    --accent-color: #ffc107;
    --text-dark: #212121;
    --text-light: #ffffff;
    --bg-light: #f5f5f5;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

header {
    background: var(--primary-gradient);
    color: var(--text-light);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

nav ul li a:hover {
    opacity: 0.8;
}

.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/charity_hero.png');
    background-size: cover;
    background-position: center;
    height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--text-light);
    text-align: center;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.btn {
    display: inline-block;
    background: var(--primary-gradient);
    color: var(--text-light);
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}

section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    color: #b71c1c;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 1rem;
}

footer {
    background: #212121;
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: left;
    margin-bottom: 2rem;
}

.footer-info h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 2rem;
    font-size: 0.9rem;
}

/* Specific styles for About Us */
.principal-section {
    display: flex;
    align-items: center;
    gap: 3rem;
    background: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.principal-img {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid #b71c1c;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    nav ul {
        margin-top: 1rem;
    }
    nav ul li {
        margin: 0 10px;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .principal-section {
        flex-direction: column;
        text-align: center;
    }
}