/* =========================================================
   3D Model & Design Viewer — Autodesk Viewer Style
   Styles for CAD Viewport, ViewCube, Floating Dock, Side Drawers,
   Materials & Textures Studio, Measure HUD, and Section Slicing.
   ========================================================= */

:root {
    --cad-bg: #0e1117;
    --cad-canvas-bg: #14171f;
    --cad-surface: rgba(20, 24, 33, 0.94);
    --cad-surface-elevated: rgba(28, 33, 46, 0.96);
    --cad-border: rgba(255, 255, 255, 0.1);
    --cad-border-accent: rgba(56, 189, 248, 0.5);
    --cad-text: #f1f5f9;
    --cad-text-muted: #94a3b8;
    --cad-text-dim: #64748b;
    --cad-accent: #38bdf8;
    --cad-accent-hover: #7dd3fc;
    --cad-accent-glow: rgba(56, 189, 248, 0.35);
    --cad-autodesk-blue: #0696d7;
    --cad-amber: #f59e0b;
    --cad-rose: #f43f5e;
    --cad-emerald: #10b981;
    --cad-radius: 12px;
    --cad-radius-sm: 8px;
    --cad-radius-pill: 9999px;
    --cad-font: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --cad-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
    --cad-shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.65);
    --cad-shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.4);
    --cad-transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── CAD Workspace Container ── */
.cad-workspace {
    position: relative;
    width: min(100% - 24px, 1400px);
    height: clamp(600px, calc(100vh - 210px), 880px);
    margin: 10px auto 40px;
    border-radius: var(--cad-radius);
    border: 1px solid var(--cad-border);
    background: var(--cad-bg);
    overflow: hidden;
    box-shadow: var(--cad-shadow);
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
}

/* Fullscreen Mode */
.cad-workspace.is-fullscreen {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    max-width: 100vw !important;
    max-height: 100vh !important;
    margin: 0 !important;
    border-radius: 0 !important;
    border: none !important;
    z-index: 999999 !important;
}

/* ── Top Bar / Header Ribbon ── */
.cad-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 14px;
    background: rgba(15, 18, 26, 0.95);
    border-bottom: 1px solid var(--cad-border);
    z-index: 20;
    gap: 12px;
}

.cad-topbar__left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.cad-model-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--cad-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 240px;
}

.cad-model-badge__icon {
    color: var(--cad-accent);
    display: inline-flex;
}

.cad-stats-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 3px 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--cad-radius-pill);
    font-family: var(--cad-mono);
    font-size: 0.72rem;
    color: var(--cad-text-muted);
}

.cad-stats-pill span {
    color: var(--cad-accent);
    font-weight: 600;
}

.cad-topbar__center {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cad-sample-select-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--cad-radius-sm);
    padding: 2px 8px;
}

.cad-sample-label {
    font-size: 0.75rem;
    color: var(--cad-text-dim);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.cad-sample-select {
    background: transparent;
    border: none;
    color: var(--cad-text);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 4px 2px;
    cursor: pointer;
    outline: none;
}

.cad-sample-select option {
    background: #181d28;
    color: #f1f5f9;
}

.cad-topbar__right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cad-btn-top {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--cad-radius-sm);
    border: 1px solid var(--cad-border);
    background: rgba(255, 255, 255, 0.06);
    color: var(--cad-text);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--cad-transition);
}

.cad-btn-top:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.cad-btn-top--accent {
    background: rgba(56, 189, 248, 0.18);
    border-color: rgba(56, 189, 248, 0.45);
    color: var(--cad-accent);
}

.cad-btn-top--accent:hover {
    background: rgba(56, 189, 248, 0.3);
    border-color: var(--cad-accent);
    color: #fff;
    box-shadow: 0 0 14px var(--cad-accent-glow);
}

/* ── Main 3D Stage / Viewport ── */
.cad-stage {
    position: relative;
    flex: 1 1 auto;
    width: 100%;
    min-height: 0;
    overflow: hidden;
    background: radial-gradient(circle at 50% 40%, #1a202c 0%, #0d1017 100%);
    cursor: grab;
}

.cad-stage:active {
    cursor: grabbing;
}

.cad-stage.tool-pan {
    cursor: move !important;
}

.cad-stage.tool-measure {
    cursor: crosshair !important;
}

.cad-stage.tool-walk {
    cursor: crosshair !important;
}

#webgl-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
    display: block;
    outline: none;
}

/* ── Autodesk ViewCube (Top-Right) ── */
.cad-viewcube-box {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 110px;
    height: 110px;
    z-index: 24;
    pointer-events: auto;
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.5));
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.has-right-drawer-open .cad-viewcube-box {
    transform: translateX(-336px);
}

#viewcube-canvas {
    width: 110px;
    height: 110px;
    display: block;
    cursor: pointer;
}

.cad-viewcube-home-btn {
    position: absolute;
    top: 0;
    left: 0;
    width: 26px;
    height: 26px;
    border-radius: 6px;
    background: rgba(18, 22, 32, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--cad-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--cad-transition);
    z-index: 5;
    padding: 0;
}

.cad-viewcube-home-btn:hover {
    background: var(--cad-accent);
    color: #0b111a;
    border-color: var(--cad-accent);
    box-shadow: 0 0 10px var(--cad-accent-glow);
}

.cad-viewcube-proj-btn {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    white-space: nowrap;
    padding: 3px 10px;
    border-radius: 12px;
    background: rgba(18, 22, 32, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--cad-text-muted);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--cad-transition);
    z-index: 5;
}

.cad-viewcube-proj-btn:hover {
    background: rgba(56, 189, 248, 0.18);
    color: var(--cad-accent);
    border-color: var(--cad-accent);
}

/* ── HUD Banners & Floating Messages ── */
.cad-hud-banner {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 18px;
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid var(--cad-border-accent);
    border-radius: var(--cad-radius-pill);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 16px var(--cad-accent-glow);
    color: var(--cad-text);
    font-size: 0.82rem;
    font-weight: 500;
    z-index: 25;
    pointer-events: auto;
    animation: cadSlideDown 0.25s ease-out;
}

.cad-hud-banner__btn {
    padding: 3px 10px;
    border-radius: var(--cad-radius-pill);
    background: rgba(244, 63, 94, 0.25);
    border: 1px solid rgba(244, 63, 94, 0.5);
    color: #fecdd3;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--cad-transition);
}

.cad-hud-banner__btn:hover {
    background: var(--cad-rose);
    color: #fff;
}

/* ── Autodesk Floating Bottom Dock / Toolbar ── */
.cad-dock {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 10px;
    background: rgba(16, 20, 28, 0.88);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--cad-radius-pill);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.65), 0 0 1px 1px rgba(255, 255, 255, 0.08);
    z-index: 30;
    pointer-events: auto;
}

.cad-dock-sep {
    width: 1px;
    height: 22px;
    background: rgba(255, 255, 255, 0.12);
    margin: 0 4px;
}

.cad-dock-btn {
    position: relative;
    width: 38px;
    height: 38px;
    border-radius: var(--cad-radius-pill);
    border: 1px solid transparent;
    background: transparent;
    color: var(--cad-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--cad-transition);
}

.cad-dock-btn:hover {
    background: rgba(255, 255, 255, 0.09);
    color: #fff;
    transform: translateY(-2px);
}

.cad-dock-btn.is-active {
    background: rgba(56, 189, 248, 0.22);
    border-color: var(--cad-accent);
    color: var(--cad-accent);
    box-shadow: 0 0 12px var(--cad-accent-glow);
}

/* Dock Tooltips */
.cad-dock-btn[data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: rgba(11, 14, 20, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    padding: 5px 10px;
    color: #fff;
    font-size: 0.72rem;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
    z-index: 50;
}

.cad-dock-btn:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── Animation Player Dock (when animated model active) ── */
.cad-anim-bar {
    position: absolute;
    bottom: 74px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 16px;
    background: rgba(16, 20, 28, 0.9);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--cad-radius-pill);
    box-shadow: var(--cad-shadow-sm);
    z-index: 29;
    color: var(--cad-text);
    font-size: 0.8rem;
    pointer-events: auto;
}

.cad-anim-play-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--cad-radius-pill);
    background: var(--cad-accent);
    border: none;
    color: #0b111a;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 700;
    transition: var(--cad-transition);
}

.cad-anim-play-btn:hover {
    background: var(--cad-accent-hover);
    transform: scale(1.08);
}

.cad-anim-slider {
    width: 180px;
    accent-color: var(--cad-accent);
    cursor: pointer;
}

.cad-anim-time {
    font-family: var(--cad-mono);
    font-size: 0.72rem;
    color: var(--cad-text-muted);
}

/* ── Side Drawers / Flyout Panels ── */
.cad-drawer {
    position: absolute;
    top: 48px;
    bottom: 0;
    width: 330px;
    background: var(--cad-surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--cad-border);
    box-shadow: var(--cad-shadow);
    z-index: 25;
    display: flex;
    flex-direction: column;
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
    pointer-events: auto;
}

.cad-drawer--left {
    left: 0;
    border-top: none;
    border-left: none;
    border-bottom: none;
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
}

.cad-drawer--left.is-open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.cad-drawer--right {
    right: 0;
    border-top: none;
    border-right: none;
    border-bottom: none;
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
}

.cad-drawer--right.is-open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

/* Drawer Header */
.cad-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--cad-border);
    background: rgba(15, 18, 25, 0.6);
}

.cad-drawer__title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--cad-text);
    display: flex;
    align-items: center;
    gap: 8px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.cad-drawer__close {
    width: 26px;
    height: 26px;
    border-radius: var(--cad-radius-sm);
    background: transparent;
    border: 1px solid transparent;
    color: var(--cad-text-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: var(--cad-transition);
}

.cad-drawer__close:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.12);
}

/* Drawer Body / Scrollable Area */
.cad-drawer__body {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 14px 16px;
    box-sizing: border-box;
}

.cad-drawer__body::-webkit-scrollbar {
    width: 6px;
}

.cad-drawer__body::-webkit-scrollbar-track {
    background: transparent;
}

.cad-drawer__body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

/* ── Model Browser Tree ── */
.cad-tree-search {
    width: 100%;
    padding: 8px 12px;
    background: rgba(12, 15, 22, 0.8);
    border: 1px solid var(--cad-border);
    border-radius: var(--cad-radius-sm);
    color: var(--cad-text);
    font-size: 0.8rem;
    margin-bottom: 12px;
    box-sizing: border-box;
    outline: none;
    transition: var(--cad-transition);
}

.cad-tree-search:focus {
    border-color: var(--cad-accent);
    box-shadow: 0 0 8px var(--cad-accent-glow);
}

.cad-tree-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.cad-tree-btn {
    font-size: 0.72rem;
    background: none;
    border: none;
    color: var(--cad-accent);
    cursor: pointer;
    font-weight: 600;
    padding: 2px 4px;
}

.cad-tree-btn:hover {
    text-decoration: underline;
}

.cad-tree {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.82rem;
}

.cad-tree-node {
    margin: 2px 0;
}

.cad-tree-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s ease;
    gap: 6px;
}

.cad-tree-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.cad-tree-item.is-selected {
    background: rgba(56, 189, 248, 0.18);
    border: 1px solid rgba(56, 189, 248, 0.35);
    color: #fff;
}

.cad-tree-label {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1 1 auto;
}

.cad-tree-label svg {
    color: var(--cad-accent);
    flex-shrink: 0;
}

.cad-tree-tools {
    display: flex;
    align-items: center;
    gap: 4px;
    opacity: 0.6;
    transition: opacity 0.15s ease;
}

.cad-tree-item:hover .cad-tree-tools,
.cad-tree-item.is-selected .cad-tree-tools {
    opacity: 1;
}

.cad-tree-tool-btn {
    background: transparent;
    border: none;
    color: var(--cad-text-muted);
    cursor: pointer;
    padding: 2px;
    display: flex;
    align-items: center;
    font-size: 0.85rem;
    border-radius: 4px;
}

.cad-tree-tool-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.cad-tree-children {
    list-style: none;
    margin: 0;
    padding-left: 16px;
    border-left: 1px dashed rgba(255, 255, 255, 0.1);
}

/* ── Properties Panel ── */
.cad-prop-group {
    margin-bottom: 16px;
    background: rgba(12, 15, 22, 0.6);
    border: 1px solid var(--cad-border);
    border-radius: var(--cad-radius-sm);
    padding: 12px;
}

.cad-prop-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    color: var(--cad-text-dim);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cad-prop-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.cad-prop-row:last-child {
    border-bottom: none;
}

.cad-prop-key {
    color: var(--cad-text-muted);
}

.cad-prop-val {
    font-family: var(--cad-mono);
    color: var(--cad-text);
    font-weight: 500;
}

/* ── Materials & Textures Studio ── */
.cad-mat-slot {
    margin-bottom: 14px;
    background: rgba(12, 15, 22, 0.6);
    border: 1px solid var(--cad-border);
    border-radius: var(--cad-radius-sm);
    padding: 12px;
}

.cad-mat-slot__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.cad-mat-slot__title {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--cad-text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.cad-mat-thumb-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.cad-mat-thumb {
    width: 52px;
    height: 52px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background-color: #232a3b;
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.cad-mat-info {
    flex: 1 1 auto;
    font-size: 0.78rem;
}

.cad-mat-info span {
    display: block;
    color: var(--cad-text-dim);
    font-size: 0.7rem;
    margin-top: 2px;
}

.cad-mat-actions {
    margin-top: 8px;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.cad-mat-badge {
    display: inline-block;
    padding: 2px 6px;
    font-size: 0.68rem;
    font-weight: 600;
    border-radius: 4px;
    background: rgba(56, 189, 248, 0.12);
    color: var(--cad-accent);
    border: 1px solid rgba(56, 189, 248, 0.25);
    margin-top: 3px;
}

.cad-btn-upload {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border-radius: 6px;
    background: rgba(56, 189, 248, 0.15);
    border: 1px solid rgba(56, 189, 248, 0.35);
    color: var(--cad-accent);
    font-size: 0.74rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--cad-transition);
}

.cad-btn-upload:hover {
    background: rgba(56, 189, 248, 0.28);
    color: #fff;
}

.cad-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 9px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--cad-text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--cad-transition);
}

.cad-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.25);
}

.cad-btn-danger {
    color: #fecdd3;
    background: rgba(244, 63, 94, 0.12);
    border-color: rgba(244, 63, 94, 0.3);
}

.cad-btn-danger:hover {
    background: var(--cad-rose);
    color: #fff;
    border-color: var(--cad-rose);
}

.cad-slider-row {
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cad-slider-label {
    width: 75px;
    font-size: 0.75rem;
    color: var(--cad-text-muted);
}

.cad-slider {
    flex: 1 1 auto;
    accent-color: var(--cad-accent);
    cursor: pointer;
}

.cad-slider-val {
    width: 38px;
    text-align: right;
    font-family: var(--cad-mono);
    font-size: 0.72rem;
    color: var(--cad-text);
}

.cad-color-picker-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
}

.cad-color-input {
    width: 44px;
    height: 28px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    background: none;
    cursor: pointer;
    padding: 0;
}

/* Material Presets Pills */
.cad-presets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    margin-top: 8px;
}

.cad-preset-btn {
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid var(--cad-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--cad-text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: var(--cad-transition);
}

.cad-preset-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.2);
}

/* ── Section Analysis Controls ── */
.cad-axis-btns {
    display: flex;
    gap: 8px;
    margin: 10px 0 16px;
}

.cad-axis-btn {
    flex: 1 1 0;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--cad-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--cad-text);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: var(--cad-transition);
}

.cad-axis-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.cad-axis-btn.is-active {
    background: var(--cad-accent);
    color: #0c121e;
    border-color: var(--cad-accent);
    box-shadow: 0 0 12px var(--cad-accent-glow);
}

.cad-toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--cad-text);
}

/* ── Measure Tool HUD ── */
.cad-measure-card {
    background: rgba(12, 16, 24, 0.7);
    border: 1px solid var(--cad-border);
    border-radius: var(--cad-radius-sm);
    padding: 14px;
    margin-bottom: 12px;
}

.cad-measure-readout {
    font-family: var(--cad-mono);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--cad-accent);
    margin: 6px 0 10px;
    text-shadow: 0 0 14px var(--cad-accent-glow);
}

.cad-delta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    font-size: 0.75rem;
    font-family: var(--cad-mono);
    color: var(--cad-text-muted);
    background: rgba(0, 0, 0, 0.25);
    padding: 8px;
    border-radius: 6px;
}

.cad-delta-item span {
    color: var(--cad-text);
    font-weight: 600;
    display: block;
}

/* ── Dropzone & Drag-over Overlay ── */
.cad-dropzone-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 24, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
    z-index: 100;
    opacity: 0;
    pointer-events: none !important;
    transform: scale(0.98);
    transition: opacity 0.22s ease, transform 0.22s ease;
}

.cad-dropzone-overlay.is-active {
    opacity: 1;
    transform: scale(1);
}

.cad-dropzone-card {
    background: rgba(18, 23, 34, 0.96);
    border: 2px dashed var(--cad-accent);
    border-radius: 20px;
    padding: 38px 44px;
    text-align: center;
    max-width: 540px;
    width: 100%;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.7), 0 0 35px var(--cad-accent-glow);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cad-dropzone-icon {
    color: var(--cad-accent);
    margin-bottom: 14px;
    display: inline-flex;
    animation: cadBounce 1.2s infinite alternate ease-in-out;
}

.cad-dropzone-text {
    font-size: 1.35rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.cad-dropzone-sub {
    font-size: 0.88rem;
    color: var(--cad-text-muted);
    margin-bottom: 18px;
    line-height: 1.5;
}

.cad-format-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    justify-content: center;
    margin-bottom: 16px;
}

.cad-format-pill {
    font-family: var(--cad-mono);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--cad-radius-pill);
    background: rgba(56, 189, 248, 0.14);
    border: 1px solid rgba(56, 189, 248, 0.35);
    color: var(--cad-accent);
}

.cad-dropzone-hint {
    font-size: 0.78rem;
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 14px;
    border-radius: var(--cad-radius-pill);
}

/* ── Loading Spinner Overlay ── */
.cad-loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(14, 17, 24, 0.88);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 80;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.cad-loading-overlay.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.cad-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--cad-accent);
    border-radius: 50%;
    animation: cadSpin 0.8s linear infinite;
}

.cad-loading-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
}

.cad-progress-bar-bg {
    width: 220px;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.cad-progress-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--cad-accent);
    transition: width 0.15s ease;
}

/* ── Toast Notifications ── */
.cad-toast {
    position: absolute;
    bottom: 80px;
    right: 24px;
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--cad-border);
    border-left: 4px solid var(--cad-accent);
    border-radius: var(--cad-radius-sm);
    padding: 10px 16px;
    color: #fff;
    font-size: 0.82rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 100;
    animation: cadSlideIn 0.25s ease;
}

/* ── Animations ── */
@keyframes cadSpin {
    to { transform: rotate(360deg); }
}

@keyframes cadBounce {
    from { transform: translateY(-8px); }
    to { transform: translateY(8px); }
}

@keyframes cadSlideDown {
    from { transform: translate(-50%, -14px); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

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

/* ── Responsive adjustments ── */
@media (max-width: 900px) {
    .cad-workspace {
        height: 540px;
        margin: 6px auto 24px;
    }

    .cad-drawer {
        width: 100%;
        max-width: 320px;
    }

    .cad-dock {
        padding: 4px 6px;
    }

    .cad-dock-btn {
        width: 34px;
        height: 34px;
        font-size: 0.95rem;
    }

    .cad-stats-pill {
        display: none;
    }
}