body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 450px;
    text-align: center;
}

h2 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

h4 {
    color: #7f8c8d;
    margin-bottom: 1.5rem;
    font-weight: normal;
}

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
}

input[type="text"], input[type="password"], input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 0.75rem;
    background-color: #3498db;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background-color: #2980b9;
}

.result {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 4px;
    text-align: left;
}

.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    color: #888;
}

table {
    width: 100%;
    margin-top: 10px;
    border-collapse: collapse;
}

table td {
    padding: 8px 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.label-td {
    font-weight: bold;
    width: 80px;
}

.btn-admin {
    background-color: #95a5a6;
    margin-top: 10px;
    display: inline-block;
    text-decoration: none;
    color: white;
    padding: 10px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.logout {
    background-color: #e74c3c;
    margin-top: 20px;
}