html, body {
    height: 100%;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    color: #333;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

header {
    text-align: center;
    padding: 20px;
    background: #ffffff;
    border-bottom: 1px solid #ddd;
}

header h1 {
    margin: 0;
    color: #2c3e50;
}

.login-container {
    width: 350px;
    margin: 60px auto;
    padding: 25px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.08);
    text-align: center;
}

.login-container h2 {
    margin-bottom: 20px;
    color: #2c3e50;
}

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    outline: none;
    background: #fafafa;
    transition: 0.2s;
}

.form-group input:focus {
    border-color: #3498db;
    background: #fff;
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 6px;
    background: #3498db;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #2d83c5;
}

.error {
    color: #e74c3c;
    background: #fdecea;
    padding: 8px;
    border-radius: 5px;
    margin-bottom: 10px;
}

.navbar {
    background: #ffffff; 
    border-bottom: 1px solid #ddd;
}

.navbar .nav-link {
    color: #2c3e50; 
    font-weight: 500;
}

.navbar .nav-link:hover {
    color: #3498db;
}

.carousel {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.carousel-inner img {
    height: 400px;
    object-fit: cover;
}

.carousel-caption {
    background: rgba(0,0,0,0.4);
    padding: 10px;
    border-radius: 6px;
    font-size: 14px;
}

table {
    width: 90%;
    margin: 30px auto;
    border-collapse: collapse;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

th {
    background: #3498db;
    color: white;
    padding: 12px;
    font-weight: 600;
}

td {
    padding: 10px;
    border-bottom: 1px solid #eee;
}

tr:hover {
    background: #f2f6fa;
}

footer {
    text-align: center;
    padding: 15px;
    background: #ffffff;
    color: #777;
    border-top: 1px solid #ddd;
}