/**
 * ==========================================================================
 * COMPONENT LIBRARY
 * Reusable UI components for the Growth Analytics Platform
 * "Carbon" Design System
 * ==========================================================================
 *
 * Components:
 * 1. Loading States & Spinners
 * 2. Skeleton Loaders
 * 3. Empty States
 * 4. Error States
 * 5. Button Variants
 * 6. Form Components
 * 7. Card Variants
 * 8. Badges & Tags
 * 9. Table Enhancements
 */

/* ==========================================================================
   1. LOADING STATES & SPINNERS
   ========================================================================== */

/* Base Loading Container */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    gap: var(--space-4);
    min-height: 200px;
}

/* Simple Circular Spinner */
.spinner {
    width: 2.5rem;
    height: 2.5rem;
    border: 3px solid var(--border-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
}

.spinner--sm {
    width: 1.25rem;
    height: 1.25rem;
    border-width: 2px;
}

.spinner--lg {
    width: 3.5rem;
    height: 3.5rem;
    border-width: 3px;
}

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

/* Circular Spinner (alias for consistency) */
.spinner-circle {
    width: 2.5rem;
    height: 2.5rem;
    border: 3px solid var(--border-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
}

/* Loading Dots */
.loading-dots {
    display: inline-flex;
    gap: 6px;
}

.loading-dots__dot {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: loading-dot-bounce 1.4s ease-in-out infinite;
}

.loading-dots__dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dots__dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes loading-dot-bounce {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.4;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Loading Text */
.loading-text {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

/* HTMX Loading Indicator */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.htmx-request.htmx-indicator {
    display: inline-flex;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(2px);
}

/* ==========================================================================
   2. SKELETON LOADERS
   ========================================================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-secondary) 0%,
        var(--bg-tertiary) 50%,
        var(--bg-secondary) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-lg);
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Skeleton Text Lines */
.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: var(--radius-sm);
}

.skeleton-text--xs { width: 30%; }
.skeleton-text--sm { width: 50%; }
.skeleton-text--md { width: 70%; }
.skeleton-text--lg { width: 90%; }
.skeleton-text--full { width: 100%; }

/* Skeleton Avatar */
.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-avatar--sm { width: 32px; height: 32px; }
.skeleton-avatar--lg { width: 56px; height: 56px; }
.skeleton-avatar--xl { width: 80px; height: 80px; }

/* Skeleton Card */
.skeleton-card {
    padding: var(--space-6);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    background: var(--bg-card);
}

.skeleton-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.skeleton-card__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* Skeleton Table Row */
.skeleton-table-row {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.skeleton-table-row__cell {
    flex: 1;
}

/* Skeleton Metric Card */
.skeleton-metric {
    padding: var(--space-6);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
}

.skeleton-metric__label {
    height: 12px;
    width: 60%;
    margin-bottom: var(--space-3);
}

.skeleton-metric__value {
    height: 36px;
    width: 80%;
    margin-bottom: var(--space-2);
}

.skeleton-metric__change {
    height: 20px;
    width: 40%;
}

/* ==========================================================================
   3. EMPTY STATES
   ========================================================================== */

.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
    position: relative;
    border: 1px dashed var(--border-light);
    border-radius: var(--radius-xl);
    background: var(--bg-card);
}

.empty-state__icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
    color: var(--text-secondary);
}

.empty-state__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    font-family: var(--font-heading);
}

.empty-state__description {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-normal);
    margin-bottom: var(--space-6);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--leading-relaxed);
}

.empty-state__action {
    display: inline-flex;
    gap: var(--space-3);
}

/* Empty State Variants */
.empty-state--no-creators .empty-state__icon::before { content: ''; }
.empty-state--no-alerts .empty-state__icon::before { content: ''; }
.empty-state--no-results .empty-state__icon::before { content: ''; }
.empty-state--no-metrics .empty-state__icon::before { content: ''; }

/* Compact Empty State */
.empty-state--compact {
    padding: var(--space-8) var(--space-4);
}

.empty-state--compact .empty-state__icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
}

.empty-state--compact .empty-state__title {
    font-size: var(--text-base);
}

.empty-state--compact .empty-state__description {
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

/* ==========================================================================
   4. ERROR STATES
   ========================================================================== */

.error-state {
    text-align: center;
    padding: var(--space-10) var(--space-6);
    background: var(--color-danger-light);
    border: 1px solid var(--color-danger);
    border-radius: var(--radius-xl);
}

.error-state__icon {
    font-size: 3rem;
    color: var(--color-danger);
    margin-bottom: var(--space-4);
}

.error-state__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.error-state__message {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

.error-state__details {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    background: var(--bg-card);
    padding: var(--space-3);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-align: left;
    overflow-x: auto;
    margin-bottom: var(--space-4);
    display: none; /* Show only in dev mode */
}

.error-state__details--visible {
    display: block;
}

.error-state__actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

/* ==========================================================================
   5. BUTTON VARIANTS
   ========================================================================== */

/* Button Base */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 200ms ease;
    text-decoration: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
    min-height: var(--touch-target-min);
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: var(--leading-normal);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

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

.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

/* Button Sizes */
.btn--sm,
.btn-sm {
    padding: var(--btn-padding-sm);
    font-size: var(--btn-font-size-sm);
    min-height: 36px;
}

.btn--lg,
.btn-lg {
    padding: var(--btn-padding-lg);
    font-size: var(--btn-font-size-lg);
    min-height: 48px;
}

/* Button Variants */
.btn--primary,
.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border-color: var(--color-primary);
}

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

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

.btn--secondary:hover,
.btn-secondary:hover {
    background-color: var(--bg-tertiary);
}

.btn--success,
.btn-success {
    background-color: var(--color-success);
    color: #FFFFFF;
    border-color: var(--color-success);
}

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

.btn--danger,
.btn-danger {
    background-color: var(--color-danger);
    color: #FFFFFF;
    border-color: var(--color-danger);
}

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

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

.btn--outline:hover {
    background-color: var(--bg-secondary);
}

.btn--ghost {
    background-color: transparent;
    border-color: transparent;
    box-shadow: none;
    color: var(--text-primary);
}

.btn--ghost:hover {
    background-color: var(--bg-tertiary);
    box-shadow: none;
    transform: none;
}

/* Button with Loading */
.btn--loading {
    pointer-events: none;
    position: relative;
}

.btn--loading .btn__text {
    visibility: hidden;
}

.btn--loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
}

/* Icon Button */
.btn--icon {
    padding: var(--space-2);
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
}

/* ==========================================================================
   6. FORM COMPONENTS
   ========================================================================== */

/* Form Group */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: var(--font-medium);
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.form-label--required::after {
    content: ' *';
    color: var(--color-danger);
}

/* Form Control */
.form-control {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    background-color: var(--input-bg);
    color: var(--text-primary);
    transition: all 200ms ease;
    box-shadow: var(--shadow-sm);
    min-height: var(--input-height-md);
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: var(--input-focus-shadow);
}

.form-control::placeholder {
    color: var(--input-placeholder);
    font-weight: var(--font-normal);
}

.form-control--error {
    border-color: var(--color-danger);
    background-color: var(--input-error-bg);
}

.form-control--success {
    border-color: var(--color-success);
}

/* Form Helper Text */
.form-help {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.form-error {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-danger);
    font-weight: var(--font-medium);
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    min-height: var(--touch-target-min);
}

.form-check__input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-check__label {
    font-size: var(--text-base);
    color: var(--text-primary);
    cursor: pointer;
}

/* ==========================================================================
   7. CARD VARIANTS
   ========================================================================== */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: var(--card-padding);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    position: relative;
    transition: all 200ms ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

/* Card without hover effect */
.card--static {
    transition: none;
}

.card--static:hover {
    transform: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

/* Card Header */
.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-light);
    position: relative;
}

.card__title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    font-family: var(--font-heading);
}

.card__subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-top: var(--space-1);
    font-weight: var(--font-normal);
}

/* Card Body */
.card__body {
    color: var(--text-primary);
}

/* Card Footer */
.card__footer {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* Non-BEM card aliases (used in templates) */
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-4); padding-bottom: var(--space-4); border-bottom: 1px solid var(--border-light); }
.card-title { font-size: 0.9375rem; font-weight: 600; color: var(--text-primary); margin: 0; font-family: var(--font-heading); }
.card-subtitle { font-size: var(--text-sm); color: var(--text-secondary); margin-top: var(--space-1); font-weight: var(--font-normal); }
.card-body { color: var(--text-primary); }

/* Metric Card */
.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
    transition: all 200ms ease;
}

.metric-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.metric-card__icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: var(--space-3);
    border: 1px solid;
}

.metric-card__icon--blue {
    background: var(--color-primary-muted);
    color: var(--color-primary);
    border-color: rgba(20, 184, 166, 0.25);
}

.metric-card__icon--green {
    background: var(--color-success-light);
    color: var(--color-success);
    border-color: rgba(52, 211, 153, 0.25);
}

.metric-card__icon--purple {
    background: rgba(139, 92, 246, 0.12);
    color: var(--color-secondary-light);
    border-color: rgba(139, 92, 246, 0.25);
}

.metric-card__icon--orange {
    background: var(--color-warning-light);
    color: var(--color-warning);
    border-color: rgba(251, 191, 36, 0.25);
}

.metric-card__label {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    letter-spacing: var(--tracking-wide);
    margin-bottom: var(--space-1);
    font-weight: 500;
}

.metric-card__value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    font-family: var(--font-heading);
}

.metric-card__change {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    padding: var(--space-1) var(--space-2);
    border-radius: 6px;
}

.metric-card__change--positive {
    color: var(--color-success);
    background: var(--color-success-light);
}

.metric-card__change--negative {
    color: var(--color-danger);
    background: var(--color-danger-light);
}

.metric-card__change--neutral {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

/* ==========================================================================
   8. BADGES & TAGS
   ========================================================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: 6px;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border: 1px solid transparent;
    transition: all 200ms ease;
}

.badge--success,
.badge-success {
    background-color: var(--badge-success-bg);
    color: var(--badge-success-text);
    border-color: transparent;
}

.badge--warning,
.badge-warning {
    background-color: var(--badge-warning-bg);
    color: var(--badge-warning-text);
    border-color: transparent;
}

.badge--danger,
.badge-danger {
    background-color: var(--badge-danger-bg);
    color: var(--badge-danger-text);
    border-color: transparent;
}

.badge--info,
.badge-info {
    background-color: var(--badge-info-bg);
    color: var(--badge-info-text);
    border-color: transparent;
}

.badge-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-color: transparent;
}

/* Platform Badges */
.badge--tiktok {
    background-color: var(--color-tiktok-bg);
    color: var(--color-tiktok);
    border-color: rgba(254, 44, 85, 0.25);
    border-radius: 6px;
}

.badge--instagram {
    background-color: var(--color-instagram-bg);
    color: var(--color-instagram);
    border-color: rgba(228, 64, 95, 0.25);
    border-radius: 6px;
}

.badge--youtube {
    background-color: var(--color-youtube-bg);
    color: var(--color-youtube);
    border-color: rgba(255, 0, 0, 0.25);
    border-radius: 6px;
}

/* Tags */
.tag {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border: 1px solid var(--border-primary);
    transition: all 200ms ease;
    cursor: pointer;
}

.tag:hover {
    background-color: var(--bg-secondary);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Tag with remove button */
.tag--removable {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.tag__remove {
    background: none;
    border: none;
    padding: 0;
    width: 16px;
    height: 16px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--duration-fast);
}

.tag__remove:hover {
    opacity: 1;
}

/* ==========================================================================
   9. TABLE ENHANCEMENTS
   ========================================================================== */

/* Selected row state */
.row-selected {
    background-color: rgba(20, 184, 166, 0.08) !important;
}

.row-selected:hover {
    background-color: rgba(20, 184, 166, 0.12) !important;
}

/* Bulk actions toolbar */
.bulk-actions {
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.bulk-actions__count {
    padding: var(--space-2) var(--space-3);
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
}

/* Indeterminate checkbox state */
input[type="checkbox"]:indeterminate {
    accent-color: var(--color-primary);
}

/* ==========================================================================
   RESPONSIVE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 768px) {
    .loading-container {
        padding: var(--space-8);
        min-height: 150px;
    }

    .empty-state {
        padding: var(--space-8) var(--space-4);
    }

    .empty-state__icon {
        font-size: 2.5rem;
    }

    .card {
        padding: var(--space-4);
    }

    .metric-card__value {
        font-size: 1.5rem;
    }
}

/* ==========================================================================
   REDUCED MOTION SUPPORT
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .spinner,
    .spinner-circle,
    .loading-dots__dot,
    .skeleton {
        animation: none;
    }

    .skeleton {
        background: var(--bg-tertiary);
    }

    .btn,
    .card,
    .metric-card,
    .badge,
    .tag {
        transition: none;
    }

    .btn:hover,
    .card:hover,
    .metric-card:hover {
        transform: none;
    }
}