/* Button Styles */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
    font-family: inherit;
    text-transform: none;
    letter-spacing: 0.3px;
}

.btn::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 var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #20c997 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background: linear-gradient(135deg, #218838 0%, #1ea080 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #e85d75 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c82333 0%, #d63c5e 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Button Loading State */
.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Button Group Interactions */
.task-actions .btn + .btn {
    margin-left: 0;
}

.task-actions:hover .btn:not(:hover) {
    opacity: 0.7;
    transform: scale(0.98);
}

/* Button Ripple Effect */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

.copy-text-btn {
    background: #6c757d !important;
    color: white !important;
    border: none !important;
    padding: 0.375rem 0.75rem !important;
    font-size: 0.8rem !important;
    margin: 0 !important;
}

.copy-text-btn:hover {
    background: #5a6268 !important;
}

.copy-text-btn:focus {
    outline: 2px solid #6c757d;
    outline-offset: 2px;
}

/* Enhanced Copy Button Interactions */
.copy-text-btn {
    position: relative;
    overflow: hidden;
}

.copy-text-btn.copied {
    background: var(--success-color) !important;
    animation: pulse 0.3s ease-out;
}

.copy-text-btn.copied::before {
    content: '✓ Copied!';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: inherit;
    animation: fadeInScale 0.3s ease-out;
}

.message-action-btn {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: auto;
}