/* ==========================================================================
   SYSTÈME DE BOUTONS UNIFIÉ - Ecophot
   Remplace 15+ définitions .btn dispersées dans l'ancien CSS
   ========================================================================== */

/* === BASE BUTTON === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    border: 2px solid transparent;
    border-radius: var(--radius-base);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    user-select: none;
    white-space: nowrap;
    vertical-align: middle;
    background-color: transparent;
}

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

.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* === VARIANTES PRINCIPALES === */

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-base);
}

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

/* Bouton secondaire / succès — couleur accessible #1e7e34 (ratio 4.86:1 avec blanc) */
.btn-secondary,
.btn-success {
    background-color: var(--secondary-accessible);
    border-color: var(--secondary-accessible);
    color: var(--white);
}

.btn-secondary:hover:not(:disabled),
.btn-success:hover:not(:disabled) {
    background-color: var(--secondary-hover);
    border-color: var(--secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-base);
}

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

/* Bouton light */
.btn-light {
    background-color: var(--white);
    border-color: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.btn-light:hover:not(:disabled) {
    background-color: var(--light);
    transform: scale(1.02);
}

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

.btn-ghost:hover:not(:disabled) {
    background-color: var(--primary-light);
}

/* === VARIANTES CONTEXTUELLES === */

.btn-success {
    background-color: var(--success);
    border-color: var(--success);
    color: var(--white);
}

.btn-success:hover:not(:disabled) {
    background-color: #218838;
    border-color: #1e7e34;
    transform: translateY(-1px);
}

.btn-warning {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--dark);
}

.btn-warning:hover:not(:disabled) {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-danger {
    background-color: var(--warning);
    border-color: var(--warning);
    color: var(--white);
}

.btn-danger:hover:not(:disabled) {
    background-color: #c82333;
    border-color: #bd2130;
}

.btn-info {
    background-color: var(--info);
    border-color: var(--info);
    color: var(--white);
}

.btn-info:hover:not(:disabled) {
    background-color: #138496;
    border-color: #117a8b;
}

/* === TAILLES === */

.btn-xs {
    padding: 4px 8px;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.btn-xl {
    padding: 20px 40px;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

/* === FORMES === */

.btn-rounded {
    border-radius: var(--radius-xl);
}

.btn-pill {
    border-radius: 50px;
}

.btn-square {
    border-radius: 0;
}

.btn-circle {
    border-radius: var(--radius-round);
    width: 48px;
    height: 48px;
    padding: 0;
}

.btn-circle.btn-sm {
    width: 36px;
    height: 36px;
}

.btn-circle.btn-lg {
    width: 56px;
    height: 56px;
}

/* === ÉTATS SPÉCIAUX === */

.btn-block {
    display: flex;
    width: 100%;
}

.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: button-loading-spinner 1s ease infinite;
}

@keyframes button-loading-spinner {
    from { transform: rotate(0turn); }
    to { transform: rotate(1turn); }
}

/* === BOUTONS AVEC ICÔNES === */

.btn-icon-left .icon,
.btn-icon-left::before {
    margin-right: var(--spacing-sm);
}

.btn-icon-right .icon,
.btn-icon-right::after {
    margin-left: var(--spacing-sm);
}

.btn-icon-only {
    padding: 12px;
    min-width: 48px;
}

/* === BOUTONS THÉMATIQUES === */

/* Boutons vintage */
.btn-vintage {
    background: linear-gradient(135deg, var(--vintage-brown), var(--vintage-light));
    border: none;
    color: #f5f5dc;
    font-weight: var(--font-weight-bold);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
    box-shadow: var(--shadow-sm);
}

.btn-vintage:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--vintage-light), var(--vintage-brown));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Boutons Matrix */
.btn-matrix {
    background-color: transparent;
    border: none;
    color: var(--matrix-green);
    font-family: var(--font-family-mono);
    letter-spacing: 1px;
    text-shadow: 0 0 10px var(--matrix-green);
    position: relative;
    overflow: hidden;
}

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

.btn-matrix:hover:not(:disabled) {
    background-color: rgba(0, 255, 0, 0.1);
    box-shadow: 0 0 20px var(--matrix-green), inset 0 0 20px rgba(0, 255, 0, 0.1);
}

.btn-matrix:hover:not(:disabled)::before {
    left: 100%;
}

/* Boutons astronomiques */
.btn-astro-primary {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    border: none;
    color: var(--astro-blue);
    font-weight: var(--font-weight-bold);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
}

.btn-astro-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #ffed4e, #ffd700);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
}

.btn-astro-outline {
    background-color: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-astro-outline:hover:not(:disabled) {
    background-color: var(--white);
    color: var(--astro-blue);
}

/* === GROUPES DE BOUTONS === */

.btn-group {
    display: inline-flex;
    vertical-align: middle;
    border-radius: var(--radius-base);
    overflow: hidden;
}

.btn-group > .btn:not(:first-child) {
    margin-left: -2px;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.btn-group > .btn:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.btn-group > .btn:hover {
    z-index: 2;
}

.btn-group > .btn:focus {
    z-index: 3;
}

/* Groupe vertical */
.btn-group-vertical {
    flex-direction: column;
    align-items: stretch;
}

.btn-group-vertical > .btn:not(:first-child) {
    margin-left: 0;
    margin-top: -2px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

.btn-group-vertical > .btn:not(:last-child) {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

/* === BOUTONS SPÉCIALISÉS (compatibilité) === */

/* Boutons de soumission */
.submit-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    border: none;
    color: var(--white);
    padding: 15px 40px;
    border-radius: 25px;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    box-shadow: 0 5px 15px rgba(26, 115, 232, 0.3);
    transition: all var(--transition-base);
}

.submit-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 115, 232, 0.4);
}

/* CTA boutons */
.cta-btn {
    background: var(--primary);
    color: var(--white);
    padding: 20px 40px;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-xl);
    border: none;
    box-shadow: var(--shadow-lg);
}

.cta-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* Boutons de documentation */
.doc-button {
    background: var(--primary);
    color: var(--white);
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-base);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.doc-button.pdf {
    background: #dc3545;
}

.doc-button.excel {
    background: var(--secondary);
}

.doc-button.word {
    background: var(--info);
}

/* Boutons d'aide/utile */
.helpful-btn {
    background: none;
    border: 1px solid var(--medium);
    color: var(--dark-light);
    padding: 4px 8px;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

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

.helpful-btn.voted {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

/* === RESPONSIVE === */

@media (max-width: 768px) {
    .btn-lg {
        padding: 14px 28px;
        font-size: var(--font-size-base);
    }
    
    .btn-xl {
        padding: 16px 32px;
        font-size: var(--font-size-lg);
    }
    
    .btn-responsive {
        width: 100%;
        margin-bottom: var(--spacing-base);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group > .btn:not(:first-child) {
        margin-left: 0;
        margin-top: -2px;
        border-top-left-radius: 0;
        border-top-right-radius: 0;
        border-bottom-left-radius: var(--radius-base);
    }
    
    .btn-group > .btn:not(:last-child) {
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
        border-top-right-radius: var(--radius-base);
    }
    
    .cta-btn {
        padding: 16px 32px;
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 10px 20px;
        font-size: var(--font-size-sm);
    }
    
    .btn-sm {
        padding: 6px 12px;
        font-size: var(--font-size-xs);
    }
    
    .btn-lg {
        padding: 12px 24px;
        font-size: var(--font-size-base);
    }
    
    .submit-btn {
        padding: 12px 24px;
        font-size: var(--font-size-base);
    }
}

/* === PRINT === */

@media print {
    .btn {
        display: none;
    }
    
    .btn-print {
        display: inline-block;
        color: black;
        background: transparent;
        border: 1px solid black;
        box-shadow: none;
    }
}

/* === ACCESSIBILITÉ === */

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

.btn[aria-pressed="true"] {
    background-color: var(--primary);
    color: var(--white);
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .btn {
        border-width: 2px;
    }
    
    .btn-outline {
        border-width: 3px;
    }
}

@media (max-width: 768px) {
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        width: 100%;
    }
}