.mass-update-form {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

/* Conteneur des étapes */
.step {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.step h3 {
    margin: 0 0 1rem;
    color: var(--text);
    font-size: 1.2rem;
    font-weight: 600;
}

/* Style des selects */
.activity-select,
.hour-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    background: #fff;
    color: var(--text);
}

.activity-select:focus,
.hour-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(133,171,118,0.2);
}

/* Bouton de mise à jour */
#update-button {
    background-color: #85AB76 !important;
    color: #fff !important;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

#update-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

#update-button:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
    transform: none;
}

/* Messages de notification */
.notice {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

/* Indicateur de chargement */
.loader {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-left: 0.5rem;
}

.loader::after {
    content: "";
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .mass-update-form {
        padding: 0 1rem;
    }

    .step {
        padding: 1rem;
    }

    #update-button {
        width: 100%;
    }
}