* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000000;
    color: #ffffff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 450px;
    background: #1a1a1a;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* Logo */
.logo {
    text-align: center;
    margin-bottom: 30px;
}

.logo h1 {
    font-size: 3em;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Messages */
.message {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    font-weight: bold;
}

.message.error {
    background: #f44336;
    color: white;
}

.message.success {
    background: #4caf50;
    color: white;
}

/* Onglets */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 15px;
    background: #2a2a2a;
    color: #999;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: #333;
    color: #fff;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* Panneaux d'onglets */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Titres */
h2 {
    text-align: center;
    margin-bottom: 25px;
    color: #fff;
}

/* Formulaires */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #ccc;
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 14px;
    background: #2a2a2a;
    border: 2px solid #333;
    border-radius: 8px;
    color: #fff;
    font-size: 16px;
    transition: all 0.3s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
    background: #333;
}

input.error-input {
    border-color: #f44336 !important;
    animation: shake 0.5s;
}

/* Messages d'erreur */
.error-message {
    display: none;
    color: #f44336;
    font-size: 14px;
    margin-top: 5px;
    font-weight: bold;
}

.error-message.show {
    display: block;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Animation shake */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* Bouton */
.btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 10px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn:active {
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 500px) {
    .container {
        padding: 25px;
    }
    
    .logo h1 {
        font-size: 2.5em;
    }
}