/* Boutons de base */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: 8px;
    transition: all 0.2s ease-in-out;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

.btn:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Bouton primaire */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1646b8 100%);
    color: #ffffff;
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(31, 95, 224, 0.25);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #1646b8 0%, var(--primary-color) 100%);
    box-shadow: 0 6px 16px rgba(31, 95, 224, 0.35);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s;
}

/* Bouton secondaire */
.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Bouton danger */
.btn-danger {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: #ffffff;
    border-color: #dc2626;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.25);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
    box-shadow: 0 6px 16px rgba(220, 38, 38, 0.35);
}

/* Bouton succès */
.btn-success {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    color: #ffffff;
    border-color: #16a34a;
    box-shadow: 0 2px 8px rgba(22, 163, 74, 0.25);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, #15803d 0%, #166534 100%);
    box-shadow: 0 6px 16px rgba(22, 163, 74, 0.35);
}

/* Bouton outline */
.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary-color);
    color: #ffffff;
}

/* Bouton ghost */
.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-hover);
}

/* Tailles */
.btn-small {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
    border-radius: 6px;
}

.btn-large {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
}

/* Largeur pleine */
.btn-block {
    width: 100%;
    display: flex;
}

/* Bouton icône */
.btn-icon {
    padding: 0.5rem;
    border-radius: 50%;
    aspect-ratio: 1;
}

/* Groupe de boutons */
.btn-group {
    display: inline-flex;
    gap: 0.5rem;
}

.btn-group .btn {
    margin: 0;
}

/* Animation de chargement */
.btn-loading {
    position: relative;
    pointer-events: none;
    color: transparent;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: btn-spin 0.6s linear infinite;
}