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

body {
    background: #f4f6f9;
}

header {
    background: #0d6efd;
    color: #fff;
    padding: 18px;
    font-size: 26px;
    font-weight: bold;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .2);
}

.container {
    width: 90%;
    margin: 30px auto;
}

.card {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, .15);
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 22px;
    background: #0d6efd;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    margin: 5px;
}

.btn:hover {
    background: #0b5ed7;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table th {
    background: #0d6efd;
    color: #fff;
    padding: 12px;
}

table td {
    padding: 12px;
    border-bottom: 1px solid #ddd;
    text-align: center;
}

input[type=file],
input[type=text] {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 6px;
}

input[type=submit] {
    background: #198754;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

input[type=submit]:hover {
    background: #157347;
}

.timer {
    color: red;
    font-weight: bold;
}

.success {
    background: #d1e7dd;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
}

.error {
    background: #f8d7da;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
}