/* Reset et variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --card-background: #ffffff;
    --radius: 8px;
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

/* Structure de base */
body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
    background: var(--card-background);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.signup-wrapper {
    padding: 2rem;
}

/* En-tête */
.signup-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.logo i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

.signup-header h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.signup-header p {
    color: var(--text-secondary);
}

/* Formulaire */
.signup-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group label i {
    color: var(--text-secondary);
    width: 1rem;
}

.form-group input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Champ mot de passe */
.password-input {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Force du mot de passe */
.password-strength {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.25rem;
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
}

.strength-fill {
    height: 100%;
    border-radius: 2px;
}

.strength-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 3.5rem;
}

/* Checkbox */
.checkbox-group {
    margin: 0.5rem 0;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.125rem;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Bouton */
.signup-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.875rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.signup-btn:hover {
    background: var(--primary-hover);
}

.loading-spinner {
    display: none;
}

.signup-btn.loading .btn-text {
    display: none;
}

.signup-btn.loading .loading-spinner {
    display: block;
}

/* Pied de page */
.signup-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

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

/* Messages d'erreur */
.error-message {
    color: var(--error-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: none;
}

.error-message.show {
    display: block;
}

/* Alertes */
.alert {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.25rem;
    max-width: 24rem;
    transform: translateX(120%);
    transition: transform 0.3s;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert.show {
    transform: translateX(0);
}

.alert.success {
    border-left: 4px solid var(--success-color);
}

.alert.error {
    border-left: 4px solid var(--error-color);
}

/* Responsive */
@media (max-width: 480px) {
    .signup-wrapper {
        padding: 1.5rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .signup-header h2 {
        font-size: 1.1rem;
    }
}