body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

h1 {
    font-size: 24px;
    color: #2c3e50;
    margin: 0;
}

.logout {
    color: #e74c3c;
    text-decoration: none;
    font-weight: bold;
}

.logout:hover {
    text-decoration: underline;
}

.error {
    background: #fde8e8;
    color: #c0392b;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    text-align: center;
}

.success-msg {
    background: #eafaf1;
    color: #27ae60;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 5px;
    font-weight: 600;
}

input[type="password"],
input[type="text"] {
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

.file-drop-area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
    padding: 40px;
    border: 2px dashed #3498db;
    border-radius: 8px;
    transition: 0.2s;
    background-color: #f9f9f9;
    box-sizing: border-box;
    margin-bottom: 20px;
}

.file-drop-area:hover {
    background-color: #e8f4fc;
}

.fake-btn {
    background-color: #3498db;
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: bold;
}

.file-msg {
    font-size: 14px;
    color: #7f8c8d;
    margin-top: 10px;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    cursor: pointer;
    opacity: 0;
}

button {
    background: #2ecc71;
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

button:hover {
    background: #27ae60;
}

button:disabled {
    background: #95a5a6;
    cursor: not-allowed;
}

.hidden {
    display: none;
}

.loader {
    margin-top: 15px;
    text-align: center;
    font-size: 14px;
    color: #3498db;
    font-weight: bold;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

small {
    font-size: 12px;
    color: #7f8c8d;
    margin-top: -10px;
}

.actions {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
}

.primary-btn {
    flex: 1;
    margin-right: 10px;
}

.secondary-btn {
    flex: 1;
    background: #e74c3c;
    color: white;
    text-decoration: none;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 4px;
    font-weight: bold;
}

.secondary-btn:hover {
    background: #c0392b;
}