/**
 * Split View Styles for Documentation Hub
 * Tmux-style multi-session split view
 * Design System: zinc/neutral, no purple, no glow
 */

/* =====================================================
   Motion Accessibility
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
  .split-view-container,
  .split-view-pane,
  .split-view-toolbar-btn,
  .split-view-toggle,
  .split-view-load-current-btn,
  .split-view-result-item,
  .split-view-pane-btn {
    animation:  none   !important;
    transition: none   !important;
    transform:  none   !important;
  }

  .split-view-spinner {
    animation: none !important;
    border: 2px solid var(--sv-primary);
    opacity: 0.4;
  }

  .split-view-pane.active .split-view-session-name {
    animation: none !important;
  }
}

/* =====================================================
   CSS Variables
   ===================================================== */
:root {
    --sv-bg: #f4f4f5;             /* zinc-100 */
    --sv-pane-bg: #ffffff;
    --sv-border: #e4e4e7;         /* zinc-200 */
    --sv-header-bg: #f4f4f5;      /* zinc-100 */
    --sv-active-border: #18181b;  /* zinc-900 — replaces purple */
    --sv-active-glow: transparent; /* no glow */
    --sv-text: #18181b;           /* zinc-900 */
    --sv-text-muted: #71717a;     /* zinc-500 */
    --sv-primary: #18181b;        /* zinc-900 */
    --sv-primary-hover: #27272a;  /* zinc-800 */
    --sv-toolbar-height: 48px;
    --sv-header-height: 36px;
    --sv-search-height: 44px;
    --sv-status-height: 28px;
    --sv-radius: 0.5rem;          /* rounded-lg */
    --sv-transition: 0.15s ease;
    --sv-icon-toggle: 22px;
    --sv-icon-title: 18px;
    --sv-icon-toolbar: 16px;
    --sv-icon-close: 20px;
    --sv-icon-pane: 14px;
    --sv-icon-search: 18px;
    --sv-icon-hero: 48px;
}

[data-md-color-scheme="slate"] {
    --sv-bg: #09090b;             /* zinc-950 */
    --sv-pane-bg: #18181b;        /* zinc-900 */
    --sv-border: #3f3f46;         /* zinc-700 */
    --sv-header-bg: #27272a;      /* zinc-800 */
    --sv-active-border: #fafafa;  /* near-white on dark */
    --sv-active-glow: transparent;
    --sv-text: #fafafa;           /* zinc-50 */
    --sv-text-muted: #a1a1aa;     /* zinc-400 */
    --sv-primary: #fafafa;
    --sv-primary-hover: #e4e4e7;
}

/* =====================================================
   Toggle Button
   ===================================================== */
.split-view-toggle {
    position: fixed;
    bottom: 80px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 0.5rem;
    background: var(--sv-primary);
    border: 1px solid var(--sv-primary);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    opacity: 0.6;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
      opacity    var(--sv-transition),
      background var(--sv-transition),
      transform  200ms cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 9990;
    color: var(--sv-pane-bg);
    -webkit-tap-highlight-color: transparent;
}

.split-view-toggle:hover {
    opacity: 1;
    background: var(--sv-primary-hover);
    box-shadow: none;
    transform: scale(1.08);
}

.split-view-toggle:active {
    transform: scale(0.95);
    transition-duration: 80ms;
}

.split-view-toggle.active {
    opacity: 1;
    background: var(--sv-primary);
}

.split-view-toggle svg {
    inline-size: var(--sv-icon-toggle);
    block-size: var(--sv-icon-toggle);
    flex-shrink: 0;
}

.split-view-title svg {
    inline-size: var(--sv-icon-title);
    block-size: var(--sv-icon-title);
    flex-shrink: 0;
}

.split-view-toolbar-btn svg {
    inline-size: var(--sv-icon-toolbar);
    block-size: var(--sv-icon-toolbar);
    flex-shrink: 0;
}

.split-view-close svg {
    inline-size: var(--sv-icon-close);
    block-size: var(--sv-icon-close);
    flex-shrink: 0;
}

/* =====================================================
   Main Container
   ===================================================== */
.split-view-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--sv-bg);
    z-index: 9995;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: scale(0.99);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0.2s;
    visibility: hidden;
    pointer-events: none;
}

.split-view-container.open {
    opacity: 1;
    transform: scale(1);
    visibility: visible;
    pointer-events: auto;
    transition-delay: 0s;
}

body.split-view-active {
    overflow: hidden;
}

body.split-view-active .md-header,
body.split-view-active .md-sidebar,
body.split-view-active .md-content,
body.split-view-active .md-footer {
    display: none;
}

/* =====================================================
   Toolbar
   ===================================================== */
.split-view-toolbar {
    height: var(--sv-toolbar-height);
    background: var(--sv-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    flex-shrink: 0;
    border-bottom: 1px solid var(--sv-border);
    box-shadow: none;
}

.split-view-toolbar-left,
.split-view-toolbar-center,
.split-view-toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.split-view-title {
    color: var(--sv-pane-bg);
    font-weight: 600;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.split-view-layout-select {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.375rem;
    color: var(--sv-pane-bg);
    padding: 5px 10px;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: background var(--sv-transition);
}

.split-view-layout-select:hover {
    background: rgba(255, 255, 255, 0.2);
}

.split-view-layout-select option {
    background: #333;
    color: white;
}

.split-view-close {
    background: rgba(255, 255, 255, 0.12);
    border: none;
    border-radius: 0.375rem;
    padding: 5px;
    cursor: pointer;
    color: var(--sv-pane-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--sv-transition);
}

.split-view-close:hover {
    background: rgba(255, 255, 255, 0.22);
}

/* =====================================================
   Grid Layout
   ===================================================== */
.split-view-grid {
    flex: 1;
    display: grid;
    grid-template-rows: repeat(2, 1fr);
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
    padding: 4px;
    position: relative;
    overflow: hidden;
    min-width: 0;
    min-height: 0;
    height: 100%;
}

/* =====================================================
   Pane
   ===================================================== */
.split-view-pane {
    background: var(--sv-pane-bg);
    border-radius: var(--sv-radius);
    border: 1px solid var(--sv-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: border-color var(--sv-transition);
    min-width: 0;
    min-height: 0;
}

.split-view-pane.active {
    border-color: var(--sv-active-border);
    box-shadow: none;
}

/* Pane Header */
.split-view-pane-header {
    height: var(--sv-header-height);
    background: var(--sv-header-bg);
    border-bottom: 1px solid var(--sv-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    flex-shrink: 0;
}

.split-view-session-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--sv-text);
}

.split-view-pane.active .split-view-session-name {
    color: var(--sv-primary);
}

.split-view-pane-controls {
    display: flex;
    gap: 4px;
}

.split-view-pane-btn {
    background: transparent;
    border: none;
    border-radius: 0.25rem;
    padding: 4px;
    cursor: pointer;
    color: var(--sv-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--sv-transition), color var(--sv-transition);
}

.split-view-pane-btn svg,
.split-view-copy-btn svg {
    inline-size: var(--sv-icon-pane);
    block-size: var(--sv-icon-pane);
    flex-shrink: 0;
}

.split-view-pane-btn:hover {
    background: var(--sv-border);
    color: var(--sv-text);
}

/* Search Bar */
.split-view-search-bar {
    height: var(--sv-search-height);
    padding: 6px 12px;
    border-bottom: 1px solid var(--sv-border);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.split-view-search-input {
    flex: 1;
    background: var(--sv-bg);
    border: 1px solid var(--sv-border);
    border-radius: 0.375rem;
    padding: 6px 12px;
    font-size: 0.8125rem;
    color: var(--sv-text);
    transition: border-color var(--sv-transition);
}

.split-view-search-input:focus {
    outline: none;
    border-color: var(--sv-primary);
    box-shadow: none;
}

.split-view-search-input::placeholder {
    color: var(--sv-text-muted);
}

.split-view-search-icon {
    color: var(--sv-text-muted);
    flex-shrink: 0;
    inline-size: var(--sv-icon-search);
    block-size: var(--sv-icon-search);
}

/* Content Area */
.split-view-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0;
    scroll-behavior: smooth;
    min-height: 0;
}

/* Status Bar */
.split-view-status {
    height: var(--sv-status-height);
    background: var(--sv-header-bg);
    border-top: 1px solid var(--sv-border);
    display: flex;
    align-items: center;
    padding: 0 12px;
    flex-shrink: 0;
}

.split-view-status-text {
    font-size: 0.6875rem;
    color: var(--sv-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* =====================================================
   Content States
   ===================================================== */

/* Welcome State */
.split-view-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 24px;
    text-align: center;
    color: var(--sv-text-muted);
}

.split-view-welcome-icon {
    color: var(--sv-border);
    margin-bottom: 16px;
}

.split-view-welcome-icon svg,
.split-view-error svg,
.split-view-no-results svg {
    inline-size: var(--sv-icon-hero);
    block-size: var(--sv-icon-hero);
    flex-shrink: 0;
}

.split-view-welcome h3 {
    margin: 0 0 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--sv-text);
}

.split-view-welcome p {
    margin: 0;
    font-size: 0.8125rem;
}

/* Loading State */
.split-view-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.split-view-spinner {
    width: 28px;
    height: 28px;
    border: 2px solid var(--sv-border);
    border-top-color: var(--sv-primary);
    border-radius: 50%;
    animation: sv-spin 0.7s linear infinite;
}

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

/* Error State */
.split-view-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 24px;
    text-align: center;
    color: #dc2626;
}

.split-view-error svg {
    color: #dc2626;
    margin-bottom: 12px;
}

.split-view-error p {
    margin: 0 0 8px;
    font-weight: 500;
}

.split-view-error small {
    color: var(--sv-text-muted);
    font-size: 0.75rem;
}

/* No Results */
.split-view-no-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 24px;
    text-align: center;
    color: var(--sv-text-muted);
}

.split-view-no-results svg {
    color: var(--sv-border);
    margin-bottom: 12px;
}

/* =====================================================
   Search Results
   ===================================================== */
.split-view-results {
    padding: 8px;
}

.split-view-result-item {
    padding: 10px;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: background var(--sv-transition), border-color var(--sv-transition);
    margin-bottom: 4px;
    border: 1px solid transparent;
}

.split-view-result-item:hover {
    background: var(--sv-border);
    border-color: var(--sv-border);
}

.split-view-result-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.split-view-result-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--sv-primary);
    margin-bottom: 4px;
}

.split-view-result-category {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 2px 6px;
    border-radius: 0.25rem;
    background: var(--sv-border);
    color: var(--sv-text-muted);
}

.split-view-result-intent,
.split-view-result-score,
.split-view-result-reason {
    display: inline-flex;
    align-items: center;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    padding: 2px 6px;
    border-radius: 999px;
    border: 1px solid var(--sv-border);
    color: var(--sv-text-muted);
}

.split-view-result-intent {
    text-transform: uppercase;
}

.split-view-result-score {
    margin-left: auto;
    font-variant-numeric: tabular-nums;
}

.split-view-result-path {
    font-size: 0.6875rem;
    color: var(--sv-text-muted);
    margin-bottom: 5px;
    word-break: break-all;
}

.split-view-result-excerpt {
    font-size: 0.8rem;
    color: var(--sv-text);
    line-height: 1.45;
}

.split-view-result-reasons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.split-view-result-item mark {
    background: var(--sv-border);
    color: var(--sv-text);
    padding: 1px 2px;
    border-radius: 2px;
}

.split-view-result-excerpt code {
    background: var(--sv-bg);
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.8em;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    border: 1px solid var(--sv-border);
}

.split-view-result-excerpt strong {
    font-weight: 600;
    color: var(--sv-text);
}

.split-view-result-excerpt em {
    font-style: italic;
}

/* =====================================================
   Document Content
   ===================================================== */
.split-view-document {
    padding: 16px;
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--sv-text);
    word-break: break-word;
    overflow-wrap: break-word;
}

.split-view-document h1,
.split-view-document h2,
.split-view-document h3,
.split-view-document h4 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    color: var(--sv-text);
}

.split-view-document h1 { font-size: 1.4rem; }
.split-view-document h2 { font-size: 1.2rem; }
.split-view-document h3 { font-size: 1.05rem; }

.split-view-document p {
    margin: 0.75em 0;
}

.split-view-document code {
    background: var(--sv-bg);
    padding: 2px 5px;
    border-radius: 0.25rem;
    font-size: 0.85em;
    border: 1px solid var(--sv-border);
}

.split-view-document pre {
    background: var(--sv-bg);
    padding: 12px;
    border-radius: 0.375rem;
    border: 1px solid var(--sv-border);
    overflow-x: auto;
    max-width: 100%;
}

.split-view-document pre code {
    background: none;
    padding: 0;
    border: none;
}

.split-view-document a {
    color: var(--sv-primary);
    text-decoration: none;
}

.split-view-document a:hover {
    text-decoration: underline;
}

.split-view-document ul,
.split-view-document ol {
    padding-left: 1.5em;
}

.split-view-document li {
    margin: 0.25em 0;
}

.split-view-document .compose-hero {
    margin: 1rem 0 1.25rem;
    padding: 0.875rem;
    border: 1px solid var(--sv-border);
    border-radius: 0.375rem;
    background: var(--sv-bg);
}

.split-view-document .compose-kicker {
    display: inline-block;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--sv-text-muted);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.split-view-document .compose-actions,
.split-view-document .stack-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 0.5rem;
}

.split-view-document .compose-actions .md-button,
.split-view-document .stack-links .md-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
    padding: 0.25rem 0.5rem;
    font-size: 0.71875rem;
    line-height: 1.25;
    border-radius: 0.375rem;
    border: 1px solid var(--sv-border);
    background: transparent;
    color: var(--sv-text);
    text-decoration: none;
    white-space: normal;
    overflow-wrap: break-word;
    max-width: 100%;
}

.split-view-document .compose-actions .md-button--primary,
.split-view-document .stack-links .md-button--primary {
    background: var(--sv-primary);
    border-color: var(--sv-primary);
    color: var(--sv-pane-bg);
}

.split-view-document .compose-grid > ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
    gap: 0.6rem;
    list-style: none;
    margin: 0.8rem 0 0;
    padding-left: 0;
    min-width: 0;
}

.split-view-document .compose-grid > ul > li {
    margin: 0;
    padding: 0.8rem;
    border: 1px solid var(--sv-border);
    border-radius: 0.375rem;
    background: var(--sv-pane-bg);
    min-width: 0;
    overflow-wrap: anywhere;
}

.split-view-document .stack-card {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    height: 100%;
    min-width: 0;
}

.split-view-document .stack-card h3 {
    margin: 0;
    font-size: 0.9375rem;
}

.split-view-document .stack-meta {
    list-style: none;
    margin: 0.45rem 0 0;
    padding: 0.45rem 0 0;
    border-top: 1px solid var(--sv-border);
    font-size: 0.78125rem;
    color: var(--sv-text-muted);
}

.split-view-document .stack-meta li {
    margin: 0.2rem 0;
}

.split-view-document .stack-meta strong {
    color: var(--sv-text);
}

.split-view-document .stack-note {
    margin-top: 0.45rem;
    padding-top: 0.45rem;
    border-top: 1px dashed var(--sv-border);
    font-size: 0.75rem;
    color: var(--sv-text-muted);
}

.split-view-document table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
    font-size: 0.8125rem;
    max-width: 100%;
    display: block;
    overflow-x: auto;
}

.split-view-document th,
.split-view-document td {
    border: 1px solid var(--sv-border);
    padding: 7px 10px;
    text-align: left;
}

.split-view-document th {
    background: var(--sv-header-bg);
    font-weight: 600;
}

.split-view-document > * {
    overflow: visible;
    height: auto;
}

.split-view-document img {
    max-width: 100%;
    height: auto;
    border-radius: 0.25rem;
    object-fit: contain;
}

.split-view-document img[src$=".svg"],
.split-view-document img[src*=".svg?"],
.split-view-document img[src*=".svg#"] {
    width: auto;
    max-width: 100%;
    height: auto;
}

.split-view-document svg {
    max-width: 100%;
    height: auto;
    width: auto;
    overflow: visible;
}

/* Scrollable table wrapper */
.split-view-table-wrapper {
    display: block;
    max-width: 100%;
    overflow-x: auto;
}

/* =====================================================
   Scrollbar
   ===================================================== */
.split-view-content::-webkit-scrollbar {
    width: 6px;
}

.split-view-content::-webkit-scrollbar-track {
    background: transparent;
}

.split-view-content::-webkit-scrollbar-thumb {
    background: var(--sv-border);
    border-radius: 3px;
}

.split-view-content::-webkit-scrollbar-thumb:hover {
    background: var(--sv-text-muted);
}

/* =====================================================
   Responsive
   ===================================================== */
@media screen and (max-width: 768px) {
    :root {
        --sv-icon-toggle: 18px;
    }

    .split-view-toggle {
        bottom: 64px;
        right: 16px;
        width: 44px;
        height: 44px;
    }

    .split-view-grid {
        grid-template-rows: 1fr;
        grid-template-columns: 1fr;
    }

    .split-view-pane:not(.active) {
        display: none;
    }

    .split-view-toolbar {
        padding: 0 12px;
    }

    .split-view-title {
        font-size: 0.875rem;
    }

    .split-view-document .compose-actions,
    .split-view-document .stack-links {
        flex-direction: column;
    }

    .split-view-document .compose-actions .md-button,
    .split-view-document .stack-links .md-button {
        width: 100%;
        justify-content: flex-start;
    }
}

/* =====================================================
   Print
   ===================================================== */
@media print {
    .split-view-toggle,
    .split-view-container {
        display: none;
    }
}

/* =====================================================
   Phase 2: Drag Resize Handles
   ===================================================== */
.split-view-grid-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.split-view-resize-handle {
    position: absolute;
    z-index: 10;
    background: transparent;
    transition: background var(--sv-transition);
    pointer-events: none;
}

.split-view-grid-wrapper:hover .split-view-resize-handle,
body.split-view-resizing .split-view-resize-handle {
    pointer-events: auto;
}

.split-view-resize-horizontal {
    height: 4px;
    cursor: row-resize;
}

.split-view-resize-vertical {
    width: 4px;
    cursor: col-resize;
}

.split-view-resize-handle:hover,
.split-view-resize-handle:active {
    background: var(--sv-border);
    opacity: 1;
}

body.split-view-resizing {
    user-select: none;
    cursor: inherit;
}

body.split-view-resizing * {
    user-select: none;
}

/* =====================================================
   Phase 2: Current Page Load Button
   ===================================================== */
.split-view-toolbar-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.375rem;
    color: var(--sv-pane-bg);
    padding: 5px 10px;
    font-size: 0.78125rem;
    cursor: pointer;
    transition: background var(--sv-transition);
    max-width: 200px;
}

.split-view-toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.22);
}

.split-view-current-page {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
}

.split-view-load-current-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 9px 18px;
    background: var(--sv-primary);
    color: var(--sv-pane-bg);
    border: 1px solid var(--sv-primary);
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--sv-transition), transform var(--sv-transition);
    box-shadow: none;
}

.split-view-load-current-btn:hover {
    background: var(--sv-primary-hover);
    border-color: var(--sv-primary-hover);
    transform: none;
    box-shadow: none;
}

/* =====================================================
   Phase 2: History Indicator
   ===================================================== */
.split-view-history-indicator {
    margin-left: auto;
    font-size: 0.65rem;
    color: var(--sv-text-muted);
    background: var(--sv-bg);
    padding: 2px 5px;
    border-radius: 0.25rem;
    border: 1px solid var(--sv-border);
    font-family: monospace;
}

.split-view-pane-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.split-view-pane-btn:disabled:hover {
    background: transparent;
    color: var(--sv-text-muted);
}

/* =====================================================
   Phase 2: Copy Button for Code Blocks
   ===================================================== */
.split-view-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 3px 7px;
    background: var(--sv-primary);
    color: var(--sv-pane-bg);
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--sv-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.split-view-document pre:hover .split-view-copy-btn {
    opacity: 1;
}

.split-view-copy-btn:hover {
    background: var(--sv-primary-hover);
}

/* =====================================================
   Phase 2: Mermaid Diagrams
   ===================================================== */
.split-view-mermaid {
    padding: 16px;
    background: var(--sv-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--sv-border);
    margin: 16px 0;
    overflow-x: auto;
}

.split-view-mermaid pre.mermaid {
    background: transparent;
    padding: 0;
}

.split-view-document .mermaid {
    margin: 16px 0;
}

.split-view-document .mermaid svg {
    max-width: 100%;
    height: auto;
    width: 100%;
    min-width: 0;
    overflow: visible;
}

/* Mermaid error state */
.split-view-mermaid-error {
    padding: 14px;
    background: rgba(220, 38, 38, 0.06);
    border: 1px solid rgba(220, 38, 38, 0.25);
    border-radius: 0.5rem;
    color: #dc2626;
    font-size: 0.8125rem;
}

.split-view-mermaid-error .mermaid-error-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.split-view-mermaid-error .mermaid-error-message {
    font-weight: 600;
}

.split-view-mermaid-retry-btn {
    border: 1px solid var(--sv-border);
    background: var(--sv-pane-bg);
    color: var(--sv-text);
    border-radius: 0.375rem;
    padding: 3px 8px;
    font-size: 0.71875rem;
    cursor: pointer;
    transition: background var(--sv-transition), border-color var(--sv-transition);
}

.split-view-mermaid-retry-btn:hover {
    background: var(--sv-border);
    color: var(--sv-text);
}

/* =====================================================
   Animations
   ===================================================== */
@keyframes sv-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.split-view-pane.active .split-view-session-name {
    animation: sv-pulse 2.5s ease-in-out infinite;
}

.split-view-pane.active:focus-within .split-view-session-name {
    animation: none;
}

/* =====================================================
   Enhanced Responsive - Phase 2 Updates
   ===================================================== */
@media screen and (max-width: 768px) {
    .split-view-toolbar-btn {
        padding: 5px 7px;
    }

    .split-view-current-page {
        display: none;
    }

    .split-view-resize-handle {
        display: none;
    }
}