/* ====================================================================
   VikCraft3DAnnotator  v4.0  —  Complete Stylesheet
   Dark engineering theme · Built for Three.js 3D annotation
   ==================================================================== */

/* ── CSS Variables ──────────────────────────────────────────────────── */
:root {
    --vc3d-accent:       #3b82f6;
    --vc3d-accent-hover: #2563eb;
    --vc3d-accent-dark:  #1d4ed8;
    --vc3d-bg:           #0d1117;
    --vc3d-surface:      #161b22;
    --vc3d-surface2:     #21262d;
    --vc3d-surface3:     #2d333b;
    --vc3d-border:       #30363d;
    --vc3d-text:         #e6edf3;
    --vc3d-text-muted:   #8b949e;
    --vc3d-text-faint:   #484f58;
    --vc3d-red:          #f85149;
    --vc3d-yellow:       #e3b341;
    --vc3d-green:        #56d364;
    --vc3d-cyan:         #79c0ff;
    --vc3d-orange:       #ffa657;
    --vc3d-purple:       #bc8cff;
    --vc3d-radius-sm:    4px;
    --vc3d-radius:       8px;
    --vc3d-radius-lg:    12px;
    --vc3d-sidebar-w:    320px;
    --vc3d-toolbar-h:    auto;
    --vc3d-font:         system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --vc3d-font-mono:    'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --vc3d-shadow:       0 4px 20px rgba(0, 0, 0, 0.5);
    --vc3d-shadow-lg:    0 8px 40px rgba(0, 0, 0, 0.7);
    --vc3d-transition:   0.18s ease;
}


/* ══════════════════════════════════════════════════════════════════════
   1.  ROOT LAYOUT
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    min-height: 500px;
    background: var(--vc3d-bg);
    color: var(--vc3d-text);
    font-family: var(--vc3d-font);
    font-size: 13px;
    overflow: hidden;
}

/* Main grid: viewer column + sidebar */
.vc3d-grid {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* Viewer column */
.vc3d-viewer-col {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    position: relative;
}

/* The Three.js viewport */
.vc3d-viewer {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--vc3d-bg);
    cursor: default;
}

.vc3d-viewer canvas {
    display: block;
}

/* Drop hint shown before any model is loaded */
.vc3d-drop-hint {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    color: var(--vc3d-text-faint);
    font-size: 15px;
    letter-spacing: 0.03em;
    z-index: 5;
}

/* Drag-over state */
.vc3d-viewer.drag-over {
    outline: 2px dashed var(--vc3d-accent);
    outline-offset: -4px;
    background: rgba(59, 130, 246, 0.06);
}

.vc3d-viewer.drag-over .vc3d-drop-hint {
    color: var(--vc3d-accent);
    font-weight: 600;
}


/* ══════════════════════════════════════════════════════════════════════
   2.  TOOLBAR
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-toolbar {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 6px 8px;
    background: var(--vc3d-surface);
    border-bottom: 1px solid var(--vc3d-border);
    flex-shrink: 0;
}

.vc3d-tb-row {
    display: flex;
    align-items: center;
    gap: 3px;
    flex-wrap: wrap;
}

/* Standard toolbar button */
.vc3d-tb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 28px;
    padding: 0 8px;
    background: transparent;
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text-muted);
    font-family: var(--vc3d-font);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--vc3d-radius-sm);
    cursor: pointer;
    transition: background var(--vc3d-transition), color var(--vc3d-transition),
                border-color var(--vc3d-transition);
    white-space: nowrap;
    user-select: none;
}

.vc3d-tb-btn:hover {
    background: var(--vc3d-surface3);
    color: var(--vc3d-text);
    border-color: #484f58;
}

.vc3d-tb-btn.active {
    background: var(--vc3d-accent);
    border-color: var(--vc3d-accent);
    color: #fff;
    font-weight: 600;
}

.vc3d-tb-btn:focus-visible {
    outline: 2px solid var(--vc3d-accent);
    outline-offset: 2px;
}

/* FontAwesome icons inside buttons inherit size */
.vc3d-tb-btn i {
    font-size: 12px;
}

/* Separator */
.vc3d-sep {
    width: 1px;
    height: 20px;
    background: var(--vc3d-border);
    margin: 0 4px;
    flex-shrink: 0;
}

/* Color dot swatches */
.vc3d-color-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.15s, border-color 0.15s;
    padding: 0;
    flex-shrink: 0;
}

.vc3d-color-dot:hover {
    transform: scale(1.25);
}

.vc3d-color-dot.active {
    border-color: #fff;
    transform: scale(1.2);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.4);
}

/* Native color input (small) */
#vc3d-color-picker {
    width: 26px;
    height: 22px;
    padding: 1px;
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius-sm);
    background: var(--vc3d-surface2);
    cursor: pointer;
    flex-shrink: 0;
}

#vc3d-color-picker::-webkit-color-swatch-wrapper { padding: 1px; }
#vc3d-color-picker::-webkit-color-swatch         { border-radius: 2px; border: none; }


/* ══════════════════════════════════════════════════════════════════════
   3.  MODE BAR
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-modebar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 10px;
    background: var(--vc3d-surface);
    border-bottom: 1px solid var(--vc3d-border);
    min-height: 28px;
    flex-shrink: 0;
}

.vc3d-mode-badge {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    border-radius: 999px;
    border: 1px solid currentColor;
    transition: background var(--vc3d-transition), color var(--vc3d-transition);
}

.vc3d-mode-edit    { color: #56d364; border-color: #56d364; background: rgba(86,211,100,.12); }
.vc3d-mode-view    { color: #79c0ff; border-color: #79c0ff; background: rgba(121,192,255,.12); }
.vc3d-mode-comment { color: #ffa657; border-color: #ffa657; background: rgba(255,166,87,.12); }

.vc3d-model-info {
    font-size: 11px;
    color: var(--vc3d-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}


/* ══════════════════════════════════════════════════════════════════════
   4.  AI HINTS BAR
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-hints-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 10px;
    background: rgba(59, 130, 246, 0.07);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
    min-height: 34px;
    flex-shrink: 0;
    transition: background 0.3s;
}

.vc3d-hints-bar.scanning {
    background: rgba(59, 130, 246, 0.13);
    animation: vc3d-bar-pulse 1.4s ease infinite;
}

@keyframes vc3d-bar-pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.7; }
}

.vc3d-hints-lbl {
    font-size: 11px;
    font-weight: 700;
    color: var(--vc3d-cyan);
    white-space: nowrap;
    flex-shrink: 0;
}

.vc3d-hints-chips {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    overflow-x: auto;
    scrollbar-width: none;
}

.vc3d-hints-chips::-webkit-scrollbar { display: none; }

.vc3d-hint-idle,
.vc3d-hint-ok,
.vc3d-hint-scanning {
    font-size: 11px;
    color: var(--vc3d-text-muted);
    white-space: nowrap;
}

.vc3d-hint-ok      { color: var(--vc3d-green); }
.vc3d-hint-scanning { color: var(--vc3d-cyan);  }

/* Individual hint chips */
.vc3d-hint-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid;
    transition: opacity 0.15s, transform 0.15s;
    flex-shrink: 0;
}

.vc3d-hint-chip:hover     { opacity: 0.85; transform: translateY(-1px); }

.vc3d-hint-chip.vc3d-hint-error {
    color: #ff8a8a; background: rgba(248,81,73,.14);
    border-color: rgba(248,81,73,.4);
}

.vc3d-hint-chip.vc3d-hint-warning {
    color: #ffd970; background: rgba(227,179,65,.13);
    border-color: rgba(227,179,65,.4);
}

.vc3d-hint-chip.vc3d-hint-info {
    color: #a0cfff; background: rgba(121,192,255,.13);
    border-color: rgba(121,192,255,.4);
}

.vc3d-scan-btn {
    flex-shrink: 0;
    padding: 3px 12px;
    background: transparent;
    border: 1px solid var(--vc3d-accent);
    color: var(--vc3d-accent);
    border-radius: var(--vc3d-radius-sm);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--vc3d-transition), color var(--vc3d-transition);
}

.vc3d-scan-btn:hover {
    background: var(--vc3d-accent);
    color: #fff;
}


/* ══════════════════════════════════════════════════════════════════════
   5.  SIDEBAR
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-sidebar {
    width: var(--vc3d-sidebar-w);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--vc3d-surface);
    border-left: 1px solid var(--vc3d-border);
    overflow: hidden;
}

/* Tab bar */
.vc3d-stabs {
    display: flex;
    border-bottom: 1px solid var(--vc3d-border);
    flex-shrink: 0;
}

.vc3d-stab {
    flex: 1;
    padding: 9px 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--vc3d-text-muted);
    font-family: var(--vc3d-font);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: color var(--vc3d-transition), border-color var(--vc3d-transition);
}

.vc3d-stab:hover { color: var(--vc3d-text); }

.vc3d-stab.active {
    color: var(--vc3d-accent);
    border-bottom-color: var(--vc3d-accent);
}

/* Tab panels */
.vc3d-stab-panel {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
}

.vc3d-stab-panel.active {
    display: flex;
}

/* Search row */
.vc3d-search-row {
    display: flex;
    gap: 6px;
    padding: 8px 10px;
    border-bottom: 1px solid var(--vc3d-border);
    flex-shrink: 0;
}

.vc3d-search-row input,
.vc3d-search-row select {
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    border-radius: var(--vc3d-radius-sm);
    font-family: var(--vc3d-font);
    font-size: 12px;
    padding: 4px 8px;
    outline: none;
    transition: border-color var(--vc3d-transition);
}

.vc3d-search-row input {
    flex: 1;
    min-width: 0;
}

.vc3d-search-row input::placeholder { color: var(--vc3d-text-faint); }

.vc3d-search-row input:focus,
.vc3d-search-row select:focus { border-color: var(--vc3d-accent); }

.vc3d-search-row select {
    flex-shrink: 0;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238b949e'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    padding-right: 20px;
    cursor: pointer;
}

.vc3d-search-row select option {
    background: var(--vc3d-surface2);
}

/* Comments list */
.vc3d-comments-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    scrollbar-width: thin;
    scrollbar-color: var(--vc3d-surface3) transparent;
}

.vc3d-comments-list::-webkit-scrollbar       { width: 5px; }
.vc3d-comments-list::-webkit-scrollbar-thumb { background: var(--vc3d-surface3); border-radius: 999px; }

/* Empty state */
.vc3d-empty {
    color: var(--vc3d-text-muted);
    font-size: 12px;
    text-align: center;
    line-height: 1.7;
    margin: 24px auto;
    max-width: 200px;
}


/* ══════════════════════════════════════════════════════════════════════
   6.  ANNOTATION CARDS
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-card {
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius);
    padding: 9px 10px;
    cursor: pointer;
    transition: background var(--vc3d-transition), border-color var(--vc3d-transition);
    flex-shrink: 0;
}

.vc3d-card:hover {
    background: var(--vc3d-surface3);
    border-color: #484f58;
}

.vc3d-card.selected {
    border-color: var(--vc3d-accent);
    background: rgba(59, 130, 246, 0.08);
}

/* Card header row */
.vc3d-card-top {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 5px;
    overflow: hidden;
}

/* Color indicator dot */
.vc3d-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.vc3d-card-ico  { font-size: 13px; flex-shrink: 0; }
.vc3d-card-type { font-size: 11px; font-weight: 600; text-transform: capitalize; color: var(--vc3d-text); }

.vc3d-card-cat {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.06em;
    padding: 1px 6px;
    border-radius: 999px;
    background: rgba(59,130,246,.18);
    color: var(--vc3d-cyan);
    flex-shrink: 0;
}

.vc3d-card-time {
    margin-left: auto;
    font-size: 10px;
    color: var(--vc3d-text-faint);
    flex-shrink: 0;
}

/* Comment text */
.vc3d-card-cmt {
    font-size: 12px;
    color: var(--vc3d-text-muted);
    line-height: 1.5;
    word-break: break-word;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.vc3d-card-cmt i { color: var(--vc3d-text-faint); }

/* Measure label inside card */
.vc3d-card-measure {
    display: inline-block;
    margin-top: 4px;
    font-size: 11px;
    font-family: var(--vc3d-font-mono);
    color: var(--vc3d-cyan);
    background: rgba(121,192,255,.1);
    border: 1px solid rgba(121,192,255,.25);
    padding: 1px 7px;
    border-radius: var(--vc3d-radius-sm);
}

/* Card action buttons */
.vc3d-card-btns {
    display: flex;
    gap: 4px;
    margin-top: 7px;
    padding-top: 7px;
    border-top: 1px solid var(--vc3d-border);
}

.vc3d-card-btns button {
    background: var(--vc3d-surface3);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text-muted);
    padding: 3px 8px;
    font-size: 12px;
    border-radius: var(--vc3d-radius-sm);
    cursor: pointer;
    transition: background var(--vc3d-transition), color var(--vc3d-transition);
    line-height: 1;
}

.vc3d-card-btns button:hover { background: var(--vc3d-accent); color: #fff; border-color: var(--vc3d-accent); }


/* ══════════════════════════════════════════════════════════════════════
   7.  MODEL EXPLORER TREE
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-tree {
    list-style: none;
    margin: 0;
    padding: 8px 6px;
    overflow-y: auto;
    flex: 1;
    font-size: 12px;
    scrollbar-width: thin;
    scrollbar-color: var(--vc3d-surface3) transparent;
}

.vc3d-tree::-webkit-scrollbar       { width: 4px; }
.vc3d-tree::-webkit-scrollbar-thumb { background: var(--vc3d-surface3); border-radius: 999px; }

.vc3d-tree ul {
    list-style: none;
    margin: 0;
    padding-left: 14px;
    border-left: 1px solid var(--vc3d-border);
}

.vc3d-tree-item {
    padding: 3px 7px;
    border-radius: var(--vc3d-radius-sm);
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--vc3d-text-muted);
    transition: background var(--vc3d-transition), color var(--vc3d-transition);
    margin: 1px 0;
}

.vc3d-tree-item:hover {
    background: var(--vc3d-surface3);
    color: var(--vc3d-text);
}

.vc3d-tree-item.active {
    background: rgba(59,130,246,.18);
    color: var(--vc3d-cyan);
}


/* ══════════════════════════════════════════════════════════════════════
   8.  ANNOTATION POPOVER
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-popover {
    position: fixed;
    z-index: 900;
    width: 270px;
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius);
    box-shadow: var(--vc3d-shadow-lg);
    overflow: hidden;
    animation: vc3d-pop-in 0.15s ease;
}

@keyframes vc3d-pop-in {
    from { opacity: 0; transform: scale(0.95) translateY(-4px); }
    to   { opacity: 1; transform: scale(1)    translateY(0); }
}

.vc3d-pop-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    background: var(--vc3d-surface3);
    border-bottom: 1px solid var(--vc3d-border);
}

.vc3d-pop-header select {
    flex: 1;
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    font-family: var(--vc3d-font);
    font-size: 12px;
    padding: 4px 6px;
    border-radius: var(--vc3d-radius-sm);
    outline: none;
    cursor: pointer;
}

.vc3d-pop-header select option { background: var(--vc3d-surface2); }
.vc3d-pop-header select:focus  { border-color: var(--vc3d-accent); }

#vc3d-pop-close {
    background: none;
    border: none;
    color: var(--vc3d-text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 2px 5px;
    border-radius: var(--vc3d-radius-sm);
    transition: color var(--vc3d-transition), background var(--vc3d-transition);
    line-height: 1;
}

#vc3d-pop-close:hover { background: var(--vc3d-red); color: #fff; }

#vc3d-pop-text {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    font-family: var(--vc3d-font);
    font-size: 12px;
    line-height: 1.5;
    resize: none;
    outline: none;
}

#vc3d-pop-text::placeholder { color: var(--vc3d-text-faint); }

.vc3d-pop-ai-btn {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 6px 10px;
    background: rgba(59,130,246,.1);
    border: none;
    border-bottom: 1px solid var(--vc3d-border);
    color: var(--vc3d-cyan);
    font-family: var(--vc3d-font);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: background var(--vc3d-transition);
}

.vc3d-pop-ai-btn:hover    { background: rgba(59,130,246,.2); }
.vc3d-pop-ai-btn:disabled { opacity: 0.5; cursor: wait; }

.vc3d-pop-footer {
    display: flex;
    gap: 6px;
    padding: 8px 10px;
    background: var(--vc3d-surface3);
}

.vc3d-pop-footer button {
    flex: 1;
    padding: 5px 0;
    border-radius: var(--vc3d-radius-sm);
    font-family: var(--vc3d-font);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--vc3d-border);
    transition: background var(--vc3d-transition), color var(--vc3d-transition);
}

#vc3d-pop-skip {
    background: var(--vc3d-surface2);
    color: var(--vc3d-text-muted);
}

#vc3d-pop-skip:hover {
    background: var(--vc3d-surface3);
    color: var(--vc3d-text);
}

#vc3d-pop-save {
    background: var(--vc3d-accent);
    border-color: var(--vc3d-accent);
    color: #fff;
}

#vc3d-pop-save:hover { background: var(--vc3d-accent-hover); }


/* ══════════════════════════════════════════════════════════════════════
   9.  STAMP PICKER
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-stamp-picker {
    position: fixed;
    z-index: 800;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius);
    box-shadow: var(--vc3d-shadow-lg);
    animation: vc3d-pop-in 0.12s ease;
}

.vc3d-stamp-opt {
    padding: 5px 14px;
    font-family: var(--vc3d-font);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    border-radius: var(--vc3d-radius-sm);
    border: 1px solid;
    cursor: pointer;
    transition: opacity 0.15s, transform 0.15s;
    white-space: nowrap;
    text-align: center;
}

.vc3d-stamp-opt:hover { opacity: 0.82; transform: scale(1.03); }


/* ══════════════════════════════════════════════════════════════════════
   10.  AI PANEL
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-ai-panel {
    position: fixed;
    right: var(--vc3d-sidebar-w);
    bottom: 0;
    width: 380px;
    max-height: 540px;
    background: var(--vc3d-surface);
    border: 1px solid var(--vc3d-border);
    border-bottom: none;
    border-radius: var(--vc3d-radius-lg) var(--vc3d-radius-lg) 0 0;
    box-shadow: var(--vc3d-shadow-lg);
    display: flex;
    flex-direction: column;
    z-index: 700;
    transform: translateY(100%);
    transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
    overflow: hidden;
}

.vc3d-ai-panel.open {
    transform: translateY(0);
}

/* AI Panel header */
.vc3d-ai-hdr {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--vc3d-surface2);
    border-bottom: 1px solid var(--vc3d-border);
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

#vc3d-ai-close {
    background: none;
    border: none;
    color: var(--vc3d-text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: var(--vc3d-radius-sm);
    transition: color var(--vc3d-transition), background var(--vc3d-transition);
    line-height: 1;
}

#vc3d-ai-close:hover { background: var(--vc3d-red); color: #fff; }

/* AI action buttons */
.vc3d-ai-actions {
    display: flex;
    gap: 5px;
    padding: 8px 10px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--vc3d-border);
    flex-shrink: 0;
}

.vc3d-ai-btn {
    flex: 1;
    min-width: 0;
    padding: 5px 8px;
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text-muted);
    font-family: var(--vc3d-font);
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--vc3d-radius-sm);
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--vc3d-transition), color var(--vc3d-transition), border-color var(--vc3d-transition);
}

.vc3d-ai-btn:hover {
    background: var(--vc3d-surface3);
    color: var(--vc3d-text);
}

.vc3d-ai-btn.vc3d-ai-accent {
    background: rgba(59,130,246,.15);
    border-color: rgba(59,130,246,.4);
    color: var(--vc3d-cyan);
}

.vc3d-ai-btn.vc3d-ai-accent:hover {
    background: var(--vc3d-accent);
    border-color: var(--vc3d-accent);
    color: #fff;
}

/* Messages area */
.vc3d-ai-msgs {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--vc3d-surface3) transparent;
}

.vc3d-ai-msgs::-webkit-scrollbar       { width: 4px; }
.vc3d-ai-msgs::-webkit-scrollbar-thumb { background: var(--vc3d-surface3); border-radius: 999px; }

/* Message bubbles */
.vc3d-ai-msg {
    max-width: 90%;
    font-size: 12px;
    line-height: 1.55;
    padding: 8px 11px;
    border-radius: var(--vc3d-radius);
    word-break: break-word;
}

.vc3d-ai-user {
    align-self: flex-end;
    background: var(--vc3d-accent-dark);
    color: #dbeafe;
    border-bottom-right-radius: 3px;
}

.vc3d-ai-assistant {
    align-self: flex-start;
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    border-bottom-left-radius: 3px;
    max-width: 100%;
}

/* Typing indicator */
.vc3d-ai-typing {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 10px 14px !important;
}

.vc3d-ai-typing span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--vc3d-accent);
    animation: vc3d-bounce 1.2s ease infinite;
}

.vc3d-ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.vc3d-ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes vc3d-bounce {
    0%, 80%, 100% { transform: translateY(0);    opacity: 0.5; }
    40%            { transform: translateY(-5px); opacity: 1;   }
}

/* AI input row */
.vc3d-ai-input-row {
    display: flex;
    gap: 6px;
    padding: 8px 10px;
    border-top: 1px solid var(--vc3d-border);
    flex-shrink: 0;
    background: var(--vc3d-surface2);
}

#vc3d-ai-input {
    flex: 1;
    background: var(--vc3d-surface);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    font-family: var(--vc3d-font);
    font-size: 12px;
    padding: 6px 8px;
    border-radius: var(--vc3d-radius-sm);
    resize: none;
    outline: none;
    line-height: 1.4;
    transition: border-color var(--vc3d-transition);
}

#vc3d-ai-input::placeholder { color: var(--vc3d-text-faint); }
#vc3d-ai-input:focus         { border-color: var(--vc3d-accent); }

#vc3d-ai-send {
    padding: 0 14px;
    background: var(--vc3d-accent);
    border: none;
    border-radius: var(--vc3d-radius-sm);
    color: #fff;
    font-family: var(--vc3d-font);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--vc3d-transition);
    white-space: nowrap;
    align-self: flex-end;
    height: 30px;
}

#vc3d-ai-send:hover { background: var(--vc3d-accent-hover); }


/* ══════════════════════════════════════════════════════════════════════
   11.  AI RESULT CARDS (Issues + Review)
   ══════════════════════════════════════════════════════════════════════ */

/* Header line */
.vc3d-issues-hdr {
    font-size: 11px;
    font-weight: 700;
    color: var(--vc3d-text-muted);
    margin-bottom: 6px;
    letter-spacing: 0.04em;
}

/* No issues */
.vc3d-no-issues {
    font-size: 12px;
    color: var(--vc3d-green);
    padding: 4px 0;
}

/* Issues container */
.vc3d-issues,
.vc3d-review {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 12px;
}

/* Single issue card */
.vc3d-issue {
    background: var(--vc3d-surface3);
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius-sm);
    padding: 8px 10px;
}

.vc3d-iss-error   { border-left: 3px solid var(--vc3d-red);    }
.vc3d-iss-warning { border-left: 3px solid var(--vc3d-yellow); }
.vc3d-iss-info    { border-left: 3px solid var(--vc3d-cyan);   }

.vc3d-iss-top {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

/* Severity badge */
.vc3d-sev-badge {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.08em;
    padding: 1px 6px;
    border-radius: 999px;
}

.vc3d-sev-error   { background: rgba(248,81,73,.18);   color: #ff8a8a; }
.vc3d-sev-warning { background: rgba(227,179,65,.18);  color: #ffd970; }
.vc3d-sev-info    { background: rgba(121,192,255,.15); color: #a0cfff; }

.vc3d-iss-cat {
    font-size: 10px;
    color: var(--vc3d-text-faint);
}

.vc3d-iss-title   { font-weight: 600; color: var(--vc3d-text); margin-bottom: 2px; }
.vc3d-iss-detail  { color: var(--vc3d-text-muted); line-height: 1.45; }
.vc3d-iss-suggest { color: var(--vc3d-yellow); margin-top: 4px; font-size: 11px; }

/* Review items */
.vc3d-rv {
    background: var(--vc3d-surface3);
    border: 1px solid var(--vc3d-border);
    border-radius: var(--vc3d-radius-sm);
    padding: 8px 10px;
}

.vc3d-rv-good       { border-left: 3px solid var(--vc3d-green);  }
.vc3d-rv-vague      { border-left: 3px solid var(--vc3d-yellow); }
.vc3d-rv-incomplete { border-left: 3px solid var(--vc3d-orange); }
.vc3d-rv-missing    { border-left: 3px solid var(--vc3d-red);    }

.vc3d-rv-top {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

.vc3d-rv-badge {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.06em;
    padding: 1px 6px;
    border-radius: 999px;
}

.vc3d-rv-badge.vc3d-rv-good       { background: rgba(86,211,100,.18);  color: #8decb4; }
.vc3d-rv-badge.vc3d-rv-vague      { background: rgba(227,179,65,.18);  color: #ffd970; }
.vc3d-rv-badge.vc3d-rv-incomplete { background: rgba(255,166,87,.16);  color: #ffb86c; }
.vc3d-rv-badge.vc3d-rv-missing    { background: rgba(248,81,73,.18);   color: #ff8a8a; }

.vc3d-rv-meta    { font-size: 10px; color: var(--vc3d-text-faint); }
.vc3d-rv-cmt     { font-style: italic; color: var(--vc3d-text-muted); margin-bottom: 3px; }
.vc3d-rv-verdict { color: var(--vc3d-text); line-height: 1.45; }
.vc3d-rv-suggest { color: var(--vc3d-cyan); margin-top: 4px; font-size: 11px; }

/* Single annotation review (from _aiReviewOne) */
.vc3d-sr {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
}

.vc3d-sr-meta { font-size: 10px; color: var(--vc3d-text-faint); }
.vc3d-sr-cmt  { font-style: italic; color: var(--vc3d-text-muted); border-left: 2px solid var(--vc3d-accent); padding-left: 6px; }


/* ══════════════════════════════════════════════════════════════════════
   12.  CSS2D LABELS (rendered over Three.js canvas)
   ══════════════════════════════════════════════════════════════════════ */

/* Base label */
.vc3d-label {
    padding: 4px 9px;
    border-radius: 6px;
    font-family: var(--vc3d-font);
    font-size: 12px;
    font-weight: 500;
    color: #fff;
    background: rgba(13, 17, 23, 0.82);
    border: 1px solid rgba(255,255,255,0.3);
    white-space: nowrap;
    pointer-events: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    line-height: 1.4;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    transform: translate(-50%, -100%);
}

/* Pin label — colored border (set inline by JS) */
.vc3d-lbl-pin {
    border-width: 2px;
    transform: translate(-50%, -100%) translateY(-6px);
}

/* Arrow label */
.vc3d-lbl-arrow {
    background: rgba(13,17,23,0.88);
    border-width: 2px;
    transform: translate(-50%, 8px);
}

/* Callout label — larger, white bg */
.vc3d-lbl-callout {
    background: #fff;
    color: #1a1a2e;
    border-width: 2px;
    font-weight: 600;
    border-radius: var(--vc3d-radius);
    padding: 5px 11px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    transform: translate(-50%, -100%) translateY(-4px);
}

/* Measure label — cyan */
.vc3d-lbl-measure {
    background: rgba(0, 22, 40, 0.9);
    border-color: #00ddff;
    color: #00ddff;
    font-family: var(--vc3d-font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    transform: translate(-50%, -100%) translateY(-3px);
    border-width: 1.5px;
}

/* Text label — bare, colored text */
.vc3d-lbl-text {
    background: transparent;
    border: none;
    font-size: 13px;
    font-weight: 700;
    text-shadow: 0 1px 3px rgba(0,0,0,0.9);
    transform: translate(-50%, -100%) translateY(-4px);
}

/* Stamp label — bold, colored box */
.vc3d-lbl-stamp {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.1em;
    border-width: 2px;
    border-radius: 4px;
    padding: 3px 10px;
    transform: translate(-50%, -100%) translateY(-6px);
}

/* Cloud region label */
.vc3d-lbl-cloud {
    background: rgba(13,17,23,0.8);
    border-style: dashed;
    border-width: 1.5px;
    font-style: italic;
    transform: translate(-50%, -50%);
}


/* ══════════════════════════════════════════════════════════════════════
   13.  LOADER OVERLAY
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-loader {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(13, 17, 23, 0.75);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.vc3d-spinner {
    width: 44px;
    height: 44px;
    border: 4px solid var(--vc3d-surface3);
    border-top-color: var(--vc3d-accent);
    border-radius: 50%;
    animation: vc3d-spin 0.8s linear infinite;
}

@keyframes vc3d-spin {
    to { transform: rotate(360deg); }
}

#vc3d-loader-msg {
    color: var(--vc3d-text-muted);
    font-size: 13px;
    margin: 0;
    letter-spacing: 0.03em;
}


/* ══════════════════════════════════════════════════════════════════════
   14.  TOAST NOTIFICATION
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--vc3d-surface2);
    border: 1px solid var(--vc3d-border);
    color: var(--vc3d-text);
    padding: 9px 20px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
    box-shadow: var(--vc3d-shadow-lg);
    z-index: 3000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    white-space: nowrap;
    max-width: 90vw;
    overflow: hidden;
    text-overflow: ellipsis;
}

.vc3d-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}


/* ══════════════════════════════════════════════════════════════════════
   15.  FORM ELEMENTS  (shared resets)
   ══════════════════════════════════════════════════════════════════════ */

.vc3d-wrapper *:focus-visible {
    outline: 2px solid var(--vc3d-accent);
    outline-offset: 2px;
}

.vc3d-wrapper input,
.vc3d-wrapper textarea,
.vc3d-wrapper select {
    color-scheme: dark;
}


/* ══════════════════════════════════════════════════════════════════════
   16.  RESPONSIVE  — narrow sidebar on small screens
   ══════════════════════════════════════════════════════════════════════ */

@media (max-width: 900px) {
    :root { --vc3d-sidebar-w: 260px; }
}

@media (max-width: 680px) {
    .vc3d-grid { flex-direction: column; }
    .vc3d-sidebar {
        width: 100%;
        max-height: 220px;
        border-left: none;
        border-top: 1px solid var(--vc3d-border);
    }
    .vc3d-ai-panel {
        right: 0;
        width: 100%;
        max-height: 60vh;
    }
}