body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #e6f0fa, #b3d9e6);
    min-height: 100vh;
}

.menu-icon {
    display: none;
    font-size: 28px;
    cursor: pointer;
    background-color: #005566;
    color: #fff;
    border: none;
    padding: 10px;
    width: 100%;
    text-align: center;
}

.navbar {
    display: flex;
    justify-content: center;
    background-color: #005566;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.navbar a {
    color: #fff;
    padding: 15px 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.navbar a:hover {
    background-color: #007b8c;
    transform: translateY(-2px);
}

.container {
    padding: 30px;
    max-width: 500px;
    margin: 40px auto;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

h1 {
    color: #003d4d;
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.8em;
}

h3 {
    color: #005566;
    text-align: center;
    margin: 20px 0 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

td {
    padding: 12px 0;
    text-align: left;
}

td:first-child {
    font-weight: bold;
    color: #005566;
    width: 40%;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #b3d9e6;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1em;
    transition: border 0.3s;
}

input[type="text"]:focus, input[type="password"]:focus {
    border-color: #005566;
    outline: none;
}

.captcha {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
}

.captcha img {
    border: 2px solid #b3d9e6;
    border-radius: 8px;
}

.refresh-btn {
    background: #005566;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
}

input[type="submit"] {
    width: 100%;
    padding: 14px;
    background-color: #005566;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: bold;
    margin-top: 20px;
    transition: background 0.3s;
}

input[type="submit"]:hover {
    background-color: #007b8c;
}

footer {
    background-color: #005566;
    color: #ffffff;
    text-align: center;
    padding: 20px;
    margin-top: 50px;
}

footer a {
    color: #b3d9e6;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .menu-icon { display: block; }
    .navbar { flex-direction: column; display: none; }
    .navbar.show { display: flex; }
    .container { margin: 20px; padding: 20px; }
    .captcha { flex-direction: column; }
}