/* ============================================
   BUTTONS.CSS - Button Components
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

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

/* Solid variants */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow: var(--shadow-glow-primary);
    transform: translateY(-2px);
}

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

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

.btn-secondary:hover {
    background: var(--color-secondary-hover);
    box-shadow: var(--shadow-glow-secondary);
    transform: translateY(-2px);
}

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

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

.btn-success:hover {
    background: var(--color-success-hover);
    box-shadow: var(--shadow-glow-success);
    transform: translateY(-2px);
}

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

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

.btn-info:hover {
    background: var(--color-info-hover);
    box-shadow: 0 0 20px rgba(var(--color-info-rgb), 0.4);
    transform: translateY(-2px);
}

.btn-info:active {
    background: var(--color-info-active);
    transform: translateY(0);
}

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

.btn-warning:hover {
    background: var(--color-warning-hover);
    box-shadow: 0 0 20px rgba(var(--color-warning-rgb), 0.4);
    transform: translateY(-2px);
}

.btn-warning:active {
    background: var(--color-warning-active);
    transform: translateY(0);
}

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

.btn-danger:hover {
    background: var(--color-danger-hover);
    box-shadow: var(--shadow-glow-danger);
    transform: translateY(-2px);
}

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

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

.btn-dark:hover {
    background: var(--color-dark-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-dark:active {
    background: var(--color-dark-active);
    transform: translateY(0);
}

.btn-light {
    background: var(--color-light);
    color: var(--color-dark);
}

.btn-light:hover {
    background: var(--color-light-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-light:active {
    background: var(--color-light-active);
    transform: translateY(0);
}

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

.btn-outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-glow-primary);
    transform: translateY(-2px);
}

.btn-outline-secondary {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--color-secondary);
    color: var(--color-white);
    box-shadow: var(--shadow-glow-secondary);
    transform: translateY(-2px);
}

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

.btn-outline-success:hover {
    background: var(--color-success);
    color: var(--color-white);
    transform: translateY(-2px);
}

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

.btn-outline-info:hover {
    background: var(--color-info);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-outline-warning {
    border-color: var(--color-warning);
    color: var(--color-warning);
    background: transparent;
}

.btn-outline-warning:hover {
    background: var(--color-warning);
    color: var(--color-dark);
    transform: translateY(-2px);
}

.btn-outline-danger {
    border-color: var(--color-danger);
    color: var(--color-danger);
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--color-danger);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-outline-dark {
    border-color: var(--color-gray-600);
    color: var(--color-gray-300);
    background: transparent;
}

.btn-outline-dark:hover {
    background: var(--color-dark);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* Ghost / Glass variant */
.btn-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    color: var(--color-white);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glass);
}

/* Gradient button */
.btn-gradient {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border: none;
}

.btn-gradient:hover {
    background: linear-gradient(135deg, var(--color-primary-hover), var(--color-secondary-hover));
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(var(--color-primary-rgb), 0.3), 0 0 30px rgba(var(--color-secondary-rgb), 0.3);
}

/* Sizes */
.btn-sm {
    padding: 0.375rem 1rem;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-md);
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    border-radius: var(--radius-xl);
}

.btn-xl {
    padding: 1rem 2.5rem;
    font-size: var(--font-size-lg);
    border-radius: var(--radius-xl);
}

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

/* Icon button */
.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-lg);
}

.btn-icon.btn-sm {
    width: 32px;
    height: 32px;
}

.btn-icon.btn-lg {
    width: 48px;
    height: 48px;
}

/* Button group */
.btn-group {
    display: inline-flex;
}

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

.btn-group .btn:first-child {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.btn-group .btn:last-child {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.btn-group .btn+.btn {
    margin-left: -2px;
}

/* Disabled */
.btn:disabled,
.btn.disabled {
    opacity: 0.5;
    pointer-events: none;
    transform: none !important;
    box-shadow: none !important;
}

/* Loading state */
.btn-loading {
    pointer-events: none;
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: btn-spin 0.6s linear infinite;
}

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