/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #2c3e50;
    color: white;
    overflow: hidden;
}

/* Ecran de chargement */
.loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(44, 62, 80, 0.8);
}

.spinner {
    border: 4px solid transparent;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1.5s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Interface principale */
.hidden {
    display: none;
}

#main-content {
    text-align: center;
    padding: 20px;
    background: #34495e;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
    animation: fadeIn 1s ease-out;
}

h1 {
    margin-bottom: 20px;
    font-size: 24px;
    animation: slideDown 1s ease-out;
}

.input-group {
    margin-bottom: 15px;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background: #ecf0f1;
    font-size: 16px;
}

input[type="text"]:focus, input[type="password"]:focus {
    outline: none;
    border-color: #3498db;
}

.btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #2980b9;
}

/* Animations */
@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes slideDown {
    0% { transform: translateY(-30px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}