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

body {
    font-family: Arial, sans-serif;
    background-color: #0f172a; /* Dark background */
    color: #facc15; /* Yellow text */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
header {
    background-color: #1e293b; /* Dark navy */
    padding: 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5em;
    color: #3b82f6; /* Blue */
    font-weight: bold;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1em;
}

nav ul li a {
    color: #facc15; /* Yellow */
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #3b82f6; /* Blue on hover */
}

/* ===== Hero Section ===== */
.hero {
    padding: 2em;
    text-align: center;
}

.search-bar {
    margin-top: 1em;
    padding: 0.5em;
    width: 60%;
    border: none;
    border-radius: 5px;
    font-size: 1em;
}

/* ===== Subjects Grid ===== */
.subjects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    padding: 20px;
}

.subject-card {
    display: block;
    background: #f8f9fa;
    border: 1px solid #ddd;
    padding: 15px;
    text-align: center;
    font-size: 16px;
    border-radius: 10px;
    text-decoration: none;
    color: #333;
    font-weight: bold;
    transition: 0.3s ease;
}

.subject-card:hover {
    background: #007bff;
    color: white;
    transform: scale(1.05);
}

/* ===== Content Area ===== */
.content {
    padding: 2em;
    text-align: center;
    flex: 1;
}

/* ===== Footer ===== */
footer {
    background-color: #1e293b;
    color: #94a3b8;
    text-align: center;
    padding: 10px 0;
    font-size: 0.9em;
    position: relative;
    bottom: 0;
    width: 100%;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }

    .search-bar {
        width: 90%;
    }

    .subjects {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
}