* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background: linear-gradient(135deg, #0b6623, #2e8b57, #4CAF50);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px;
}

/* For index.php registration card */
.container {
    width: 100%;
    max-width: 450px;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,.2);
}

/* For students.php full card */
.students-container {
    width: 95%;
    max-width: 1100px;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,.2);
}

.header {
    text-align: center;
    margin-bottom: 25px;
}

.header h1 {
    color: #0b6623;
}

.header p {
    color: #555;
}

label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}

input,
select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 8px;
}

button {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    background: #0b6623;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #228B22;
}

.links {
    text-align: center;
}

.links a {
    color: #0b6623;
    text-decoration: none;
    font-weight: bold;
}

.table-container {
    width: 100%;
    overflow-x: auto;
    margin-top: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background: #0b6623;
    color: white;
    padding: 12px;
    text-align: center;
    white-space: nowrap;
}

td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
    vertical-align: middle;
}

tr:nth-child(even) {
    background: #f5f5f5;
}

.total-students {
    background: #0b6623;
    color: white;
    padding: 15px;
    margin-top: 20px;
    border-radius: 8px;
    text-align: center;
    font-size: 18px;
}

.delete-btn {
    display: inline-block;
    color: white !important;
    background: #dc3545;
    padding: 7px 12px;
    border-radius: 5px;
    text-decoration: none !important;
    font-weight: bold;
    white-space: nowrap;
    transition: background 0.2s ease;
}

.delete-btn:hover {
    background: #b02a37;
}