/**
 * Button Components
 * Professional button styles with proper states
 */

/* =============================================================================
   BASE BUTTON STYLING
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: var(--border-width-1) solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-colors), var(--transition-shadow);
}

.btn:hover {
    text-decoration: none;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

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

/* Button Icons */
.btn i, .btn .fas, .btn .bi {
    font-size: var(--font-size-lg);
}

/* =============================================================================
   BUTTON VARIANTS - SOLID
   ============================================================================= */

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
}

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

/* Secondary Button */
.btn-secondary {
    color: white;
    background-color: var(--color-gray-600);
    border-color: var(--color-gray-600);
}

.btn-secondary:hover {
    background-color: var(--color-gray-700);
    border-color: var(--color-gray-700);
    box-shadow: var(--shadow-md);
}

/* Success Button */
.btn-success {
    color: white;
    background-color: var(--color-success);
    border-color: var(--color-success);
}

.btn-success:hover {
    background-color: var(--color-success-hover);
    border-color: var(--color-success-hover);
    box-shadow: var(--shadow-md);
}

/* Info Button */
.btn-info {
    color: white;
    background-color: var(--color-info);
    border-color: var(--color-info);
}

.btn-info:hover {
    background-color: var(--color-info-hover);
    border-color: var(--color-info-hover);
    box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning {
    color: white;
    background-color: var(--color-warning);
    border-color: var(--color-warning);
}

.btn-warning:hover {
    background-color: var(--color-warning-hover);
    border-color: var(--color-warning-hover);
    box-shadow: var(--shadow-md);
}

/* Danger Button */
.btn-danger {
    color: white;
    background-color: var(--color-danger);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background-color: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
    box-shadow: var(--shadow-md);
}

/* Light Button */
.btn-light {
    color: var(--color-text);
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-200);
}

.btn-light:hover {
    background-color: var(--color-gray-200);
    border-color: var(--color-gray-300);
}

/* Dark Button */
.btn-dark {
    color: white;
    background-color: var(--color-gray-800);
    border-color: var(--color-gray-800);
}

.btn-dark:hover {
    background-color: var(--color-gray-900);
    border-color: var(--color-gray-900);
    box-shadow: var(--shadow-md);
}

/* =============================================================================
   BUTTON VARIANTS - OUTLINE
   ============================================================================= */

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

.btn-outline-primary:hover {
    color: white;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.btn-outline-secondary:hover {
    color: white;
    background-color: var(--color-gray-600);
    border-color: var(--color-gray-600);
}

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

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

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

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

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

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

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

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

/* =============================================================================
   BUTTON SIZES
   ============================================================================= */

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
}

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

/* =============================================================================
   BUTTON GROUPS
   ============================================================================= */

.btn-group {
    position: relative;
    display: inline-flex;
    vertical-align: middle;
}

.btn-group > .btn {
    position: relative;
    flex: 0 1 auto;
}

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

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

.btn-group > .btn:hover,
.btn-group > .btn:focus {
    z-index: 1;
}

/* =============================================================================
   BUTTON WITH LOADING STATE
   ============================================================================= */

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

.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: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

/* =============================================================================
   ICON BUTTONS
   ============================================================================= */

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

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

/* =============================================================================
   CLOSE BUTTON
   ============================================================================= */

.btn-close {
    box-sizing: content-box;
    width: 1em;
    height: 1em;
    padding: 0.25em;
    color: var(--color-text);
    background: transparent url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3cpath d='M.293.293a1 1 0 011.414 0L8 6.586 14.293.293a1 1 0 111.414 1.414L9.414 8l6.293 6.293a1 1 0 01-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 01-1.414-1.414L6.586 8 .293 1.707a1 1 0 010-1.414z'/%3e%3c/svg%3e") center/1em auto no-repeat;
    border: 0;
    border-radius: var(--radius-sm);
    opacity: 0.5;
    cursor: pointer;
    transition: opacity var(--duration-fast) var(--ease-in-out);
}

.btn-close:hover {
    opacity: 1;
}

[data-theme="dark"] .btn-close {
    background: transparent url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23fff'%3e%3cpath d='M.293.293a1 1 0 011.414 0L8 6.586 14.293.293a1 1 0 111.414 1.414L9.414 8l6.293 6.293a1 1 0 01-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 01-1.414-1.414L6.586 8 .293 1.707a1 1 0 010-1.414z'/%3e%3c/svg%3e") center/1em auto no-repeat;
}

/* =============================================================================
   SOCIAL & BRAND BUTTONS
   ============================================================================= */

.btn-wallet {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
}

.btn-wallet:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    box-shadow: var(--shadow-lg);
}

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (max-width: 768px) {
    .btn {
        padding: var(--space-2) var(--space-3);
        font-size: var(--font-size-sm);
    }
    
    .btn-lg {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-base);
    }
    
    /* Make buttons full-width on mobile if they're in a button container */
    .button-container .btn {
        width: 100%;
    }
}