/*
 * BRR Loading Indicators
 * Skeleton loaders, spinners, and shimmer effects
 * Matches terminal/dark theme aesthetic (Steel Navy #1E3A5F)
 */

/* ============================================
   SPINNER - Reusable inline/block spinner
   ============================================ */
.brr-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: #3b82f6;
    border-right-color: #3b82f6;
    border-radius: 50%;
    animation: brr-spin 0.7s linear infinite;
}

.brr-spinner--sm {
    width: 14px;
    height: 14px;
    border-width: 1.5px;
}

.brr-spinner--lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

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

/* ============================================
   SKELETON SHIMMER - Base shimmer animation
   ============================================ */
@keyframes brr-shimmer {
    0% {
        background-position: -400px 0;
    }
    100% {
        background-position: 400px 0;
    }
}

/* ============================================
   LOADING OVERLAY - Full panel/section overlay
   ============================================ */
.brr-loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: rgba(10, 22, 40, 0.85);
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.brr-loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.brr-loading-overlay__text {
    font-size: 12px;
    font-weight: 500;
    color: #94a3b8;
    letter-spacing: 0.3px;
    font-family: var(--font-mono, monospace);
}

/* Light theme variant */
.brr-loading-overlay--light {
    background: rgba(248, 250, 252, 0.9);
}

.brr-loading-overlay--light .brr-loading-overlay__text {
    color: var(--text-secondary, #475569);
}

/* ============================================
   TERMINAL LOADING SCREEN
   Full-screen skeleton for main dashboard
   ============================================ */
.brr-terminal-loading {
    padding: 12px 16px;
}

/* Cards row skeleton */
.brr-terminal-loading__cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 12px;
}

.brr-terminal-loading__card {
    background: #0d1c30;
    border: 1px solid #1e3a5f;
    border-radius: 6px;
    overflow: hidden;
}

.brr-terminal-loading__card-header {
    padding: 8px 12px;
    background: #162a46;
    border-bottom: 1px solid #1e3a5f;
}

.brr-terminal-loading__card-header-line {
    width: 80px;
    height: 10px;
    border-radius: 2px;
}

.brr-terminal-loading__card-body {
    padding: 8px 12px;
}

.brr-terminal-loading__card-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid #162a46;
}

.brr-terminal-loading__card-row:last-child {
    border-bottom: none;
}

.brr-terminal-loading__card-label {
    width: 56px;
    height: 10px;
    border-radius: 2px;
}

.brr-terminal-loading__card-value {
    width: 40px;
    height: 12px;
    border-radius: 2px;
}

/* Table skeleton */
.brr-terminal-loading__table {
    background: #0d1c30;
    border: 1px solid #1e3a5f;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
}

.brr-terminal-loading__table-header {
    padding: 8px 12px;
    background: #162a46;
    border-bottom: 1px solid #1e3a5f;
    display: flex;
    justify-content: space-between;
}

.brr-terminal-loading__table-title {
    width: 120px;
    height: 10px;
    border-radius: 2px;
}

.brr-terminal-loading__table-subtitle {
    width: 80px;
    height: 10px;
    border-radius: 2px;
}

.brr-terminal-loading__table-row {
    display: flex;
    padding: 8px 12px;
    gap: 16px;
    border-bottom: 1px solid #162a46;
}

.brr-terminal-loading__table-row:last-child {
    border-bottom: none;
}

.brr-terminal-loading__table-cell {
    flex: 1;
    height: 12px;
    border-radius: 2px;
}

.brr-terminal-loading__table-cell:first-child {
    flex: 2;
}

/* Shared shimmer background for terminal skeleton elements */
.brr-terminal-loading__card-header-line,
.brr-terminal-loading__card-label,
.brr-terminal-loading__card-value,
.brr-terminal-loading__table-title,
.brr-terminal-loading__table-subtitle,
.brr-terminal-loading__table-cell {
    background: linear-gradient(
        90deg,
        #162a46 0%,
        #1e3a5f 40%,
        #162a46 80%
    );
    background-size: 800px 100%;
    animation: brr-shimmer 1.8s ease-in-out infinite;
}

/* Stagger the shimmer animation for visual depth */
.brr-terminal-loading__cards .brr-terminal-loading__card:nth-child(2) * {
    animation-delay: 0.15s;
}
.brr-terminal-loading__cards .brr-terminal-loading__card:nth-child(3) * {
    animation-delay: 0.3s;
}
.brr-terminal-loading__cards .brr-terminal-loading__card:nth-child(4) * {
    animation-delay: 0.45s;
}

/* ============================================
   IFRAME LOADING - For Power BI / embedded content
   ============================================ */
.brr-iframe-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: var(--bg-base, #F8FAFC);
    z-index: 5;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.brr-iframe-loading.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.brr-iframe-loading__bar {
    width: 180px;
    height: 3px;
    background: var(--border-default, #E2E8F0);
    border-radius: 2px;
    overflow: hidden;
}

.brr-iframe-loading__bar-fill {
    width: 40%;
    height: 100%;
    background: #3b82f6;
    border-radius: 2px;
    animation: brr-bar-slide 1.4s ease-in-out infinite;
}

@keyframes brr-bar-slide {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

.brr-iframe-loading__text {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted, #94A3B8);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-sans, sans-serif);
}

/* ============================================
   PANEL SKELETON - For news/pulse panels
   ============================================ */
.brr-panel-skeleton {
    padding: var(--space-4, 16px);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.brr-panel-skeleton__item {
    display: flex;
    gap: 12px;
}

.brr-panel-skeleton__icon {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    flex-shrink: 0;
}

.brr-panel-skeleton__lines {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 4px;
}

.brr-panel-skeleton__line {
    height: 10px;
    border-radius: 3px;
}

.brr-panel-skeleton__line:nth-child(1) { width: 85%; }
.brr-panel-skeleton__line:nth-child(2) { width: 65%; }
.brr-panel-skeleton__line:nth-child(3) { width: 45%; }

.brr-panel-skeleton__icon,
.brr-panel-skeleton__line {
    background: linear-gradient(
        90deg,
        var(--bg-sunken, #F1F5F9) 0%,
        var(--bg-accent, #E8EEF4) 40%,
        var(--bg-sunken, #F1F5F9) 80%
    );
    background-size: 800px 100%;
    animation: brr-shimmer 1.8s ease-in-out infinite;
}

/* Stagger panel skeleton items */
.brr-panel-skeleton__item:nth-child(2) .brr-panel-skeleton__icon,
.brr-panel-skeleton__item:nth-child(2) .brr-panel-skeleton__line { animation-delay: 0.2s; }
.brr-panel-skeleton__item:nth-child(3) .brr-panel-skeleton__icon,
.brr-panel-skeleton__item:nth-child(3) .brr-panel-skeleton__line { animation-delay: 0.4s; }
.brr-panel-skeleton__item:nth-child(4) .brr-panel-skeleton__icon,
.brr-panel-skeleton__item:nth-child(4) .brr-panel-skeleton__line { animation-delay: 0.6s; }
.brr-panel-skeleton__item:nth-child(5) .brr-panel-skeleton__icon,
.brr-panel-skeleton__item:nth-child(5) .brr-panel-skeleton__line { animation-delay: 0.8s; }

/* ============================================
   RESPONSIVE - Adjust skeleton for mobile
   ============================================ */
@media (max-width: 1200px) {
    .brr-terminal-loading__cards {
        grid-template-columns: 1fr;
    }
}