/* ====================================================================
   MD POST READER WIDGETS - 2-Widget Sidebar (ToC + Progress)
   ==================================================================== */

.md-widget-container {
    display: flex;
    flex-direction: column;
    gap: var(--io-space-lg);
    height: 100%; /* Fill sidebar */
}

/* ====================================================================
   GADGET BASE
   ==================================================================== */

.md-widget {
    background: var(--io-surface-raised);
    border: 1px solid var(--io-border);
    display: flex;
    flex-direction: column;
    box-shadow: var(--io-shadow-sm);
    position: relative;
    z-index: 1;
}

.md-widget::before {
    content: '';
    position: absolute;
    left: 0;
    top: 15%;
    height: 70%;
    width: 1px;
    background: var(--io-border-fade-accent-v);
    pointer-events: none;
    z-index: 2;
}

.md-widget-header {
    background: var(--io-surface-overlay);
    border-bottom: 1px solid var(--io-border);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--io-text-xs);
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-family: var(--io-font-primary);
    flex-shrink: 0;
    color: var(--io-text-primary);
}

.md-widget-header i {
    color: var(--io-accent);
    font-size: var(--io-icon-sm);
}

.md-widget-body {
    padding: var(--io-space-md);
    overflow: hidden; /* Prevent body overflow */
}

/* ====================================================================
   TABLE OF CONTENTS - FLEX GROW (Takes all available space)
   ==================================================================== */

.md-widget-toc {
    flex: 1; /* Grow to fill available space */
    min-height: 0; /* Allow flexbox shrinking */
    display: flex;
    flex-direction: column;
}

.md-widget-toc .md-widget-body {
    flex: 1;
    overflow-y: auto; /* Scroll if content too large */
    overflow-x: hidden;
}

/* Custom scrollbar for ToC */
.md-widget-toc .md-widget-body::-webkit-scrollbar {
    width: 4px;
}

.md-widget-toc .md-widget-body::-webkit-scrollbar-track {
    background: var(--io-surface-base);
}

.md-widget-toc .md-widget-body::-webkit-scrollbar-thumb {
    background: var(--io-accent-subtle);
    border-radius: var(--io-radius-sm);
}

.md-widget-toc .md-widget-body::-webkit-scrollbar-thumb:hover {
    background: var(--io-accent);
}

.md-toc-list {
    list-style: none;
}

.md-toc-item {
    border-left: 2px solid var(--io-border-subtle);
    padding: 8px 0 8px 12px;
    font-size: var(--io-text-xs);
    color: var(--io-text-secondary);
    cursor: pointer;
    transition: all var(--io-transition-base);
    font-family: var(--io-font-primary);
    position: relative;
}

.md-toc-item:hover {
    color: var(--io-accent);
    border-left-color: var(--io-accent);
    background: var(--io-bg-accent-subtle);
}

.md-toc-item.active {
    color: var(--io-accent);
    border-left-color: var(--io-accent);
    font-weight: 900;
    background: var(--io-bg-accent-subtle);
}

.md-toc-item.active::before {
    content: '';
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--io-accent);
}

.md-toc-item.level-2 {
    padding-left: 12px;
}

.md-toc-item.level-3 {
    padding-left: 24px;
    font-size: 11px;
}

/* Style for the A element in ToC */
.md-toc-link {
    color: inherit;
    text-decoration: none;
    display: block;
    width: 100%;
    transition: color var(--io-transition-base);
}

.md-toc-link:hover {
    color: var(--io-accent);
}

.md-toc-item.active .md-toc-link {
    color: var(--io-accent);
}

/* ====================================================================
   READING PROGRESS - FIXED HEIGHT
   ==================================================================== */

.md-widget-progress {
    flex-shrink: 0; /* Don't shrink */
    height: auto; /* Auto height based on content */
}

.md-progress-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--io-space-md);
    position: relative;
}

.md-progress-ring {
    width: 120px;
    height: 120px;
}

.md-progress-ring circle {
    fill: none;
    stroke-width: 8;
}

.md-progress-ring .bg {
    stroke: var(--io-surface-base);
}

.md-progress-ring .progress {
    stroke: var(--io-accent);
    stroke-linecap: square;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset var(--io-transition-base);
}

.md-progress-text {
    position: absolute;
    font-size: var(--io-text-2xl);
    font-weight: 900;
    color: var(--io-accent);
    font-family: var(--io-font-primary);
}

.md-progress-info {
    text-align: center;
    font-size: var(--io-text-xs);
    color: var(--io-text-secondary);
    font-family: var(--io-font-primary);
}

/* ====================================================================
   PULSE ANIMATION (for Progress header)
   ==================================================================== */

.md-pulse {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--io-accent);
    border-radius: var(--io-radius-full);
    margin-right: 6px;
    animation: io-pulse 2s infinite;
}

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

@media (max-width: 1200px) {
    .md-progress-ring {
        width: 100px;
        height: 100px;
    }
    
    .md-progress-text {
        font-size: var(--io-text-xl);
    }
}

@media (max-width: 900px) {
    .md-widget-container {
        gap: var(--io-space-md);
        height: auto; /* Don't fill height on mobile */
    }
    
    .md-widget-toc {
        flex: none; /* Don't grow on mobile */
        max-height: 200px; /* Limit ToC height */
    }
    
    .md-progress-ring {
        width: 80px;
        height: 80px;
    }
    
    .md-progress-text {
        font-size: var(--io-text-lg);
    }
}

@media (max-width: 600px) {
    .md-widget-body {
        padding: var(--io-space-sm);
    }
    
    .md-toc-item {
        font-size: 11px;
        padding: 6px 0 6px 10px;
    }
    
    .md-toc-item.level-3 {
        font-size: 10px;
        padding-left: 20px;
    }
}

/* ====================================================================
   ANIMATIONS
   ==================================================================== */

.md-widget {
    animation: io-slide-up var(--io-transition-base);
}

.md-widget:nth-child(1) { animation-delay: 0ms; }
.md-widget:nth-child(2) { animation-delay: 50ms; }

/* ====================================================================
   ACCESSIBILITY
   ==================================================================== */

.md-toc-item:focus-visible {
    outline: 2px solid var(--io-accent);
    outline-offset: 2px;
}

.md-toc-link:focus-visible {
    outline: none;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    .md-widget,
    .md-toc-item,
    .md-progress-ring .progress,
    .md-pulse {
        animation: none;
        transition: none;
    }
}