/* =============================================
   BUTTON STYLES - Math Platform
   © Situ Ghosh - All Rights Reserved
   ============================================= */

/* Base Button Reset */
button {
    font-family: 'Poppins', sans-serif;
    cursor: pointer;
    border: none;
    outline: none;
}

/* Action Buttons */
.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.action-btn i {
    font-size: 1rem;
}

/* Primary Action */
.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-light);
}

.action-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 126, 0.3);
}

/* Secondary Action */
.action-btn.secondary {
    background: var(--background-light);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.action-btn.secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Success Action */
.action-btn.success {
    background: linear-gradient(135deg, #28a745, #218838);
    color: var(--text-light);
}

.action-btn.success:hover {
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

/* Warning Action */
.action-btn.warning {
    background: linear-gradient(135deg, var(--accent-color), #e0a800);
    color: var(--secondary-color);
}

.action-btn.warning:hover {
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}

/* Danger Action */
.action-btn.danger {
    background: linear-gradient(135deg, #dc3545, #c82333);
    color: var(--text-light);
}

.action-btn.danger:hover {
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
}

/* Icon Only Button */
.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--background-light);
    color: var(--text-secondary);
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--primary-color);
    color: var(--text-light);
}

.icon-btn.sm {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
}

.icon-btn.lg {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
}

/* Category Buttons */
.category-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 18px 15px;
    background: var(--background-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition);
    border: 2px solid transparent;
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-btn.active {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

.category-btn i {
    font-size: 1.3rem;
}

.category-btn span {
    font-size: 0.85rem;
    font-weight: 500;
}

/* Quick Example Buttons */
.quick-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.quick-example-btn {
    padding: 8px 14px;
    background: var(--background-light);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.quick-example-btn:hover {
    background: var(--primary-color);
    color: var(--text-light);
}

/* Tab Buttons */
.tab-buttons {
    display: flex;
    gap: 5px;
    background: var(--background-light);
    padding: 5px;
    border-radius: var(--radius-md);
}

.tab-btn {
    padding: 10px 20px;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* Color Buttons */
.color-buttons {
    display: flex;
    gap: 8px;
}

.color-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 3px solid transparent;
    transition: var(--transition);
}

.color-btn:hover {
    transform: scale(1.1);
}

.color-btn.active {
    border-color: var(--secondary-color);
}

.color-btn.white { background: var(--chalk-white); }
.color-btn.yellow { background: var(--chalk-yellow); }
.color-btn.blue { background: var(--chalk-blue); }
.color-btn.red { background: var(--chalk-red); }

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-light);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 99;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

/* Solve Button */
.solve-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-light);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.solve-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13, 110, 126, 0.4);
}

.solve-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.solve-btn i {
    font-size: 1.1rem;
}

/* Clear Button */
.clear-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 12px;
    background: var(--background-light);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    margin-top: 10px;
}

.clear-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Button Groups */
.btn-group {
    display: flex;
    gap: 10px;
}

.btn-group.vertical {
    flex-direction: column;
}

.btn-group.centered {
    justify-content: center;
}

.btn-group.spread {
    justify-content: space-between;
}

/* Disabled State */
button:disabled,
.btn-disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Loading State */
button.loading {
    position: relative;
    color: transparent;
}

button.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}