/* =========================================================================
   base.css — Universal foundation
   Loaded by every command/page. Contains:
   - Box-sizing reset, html/body reset
   - :root design tokens (Native CAD palette + b-spline-gen palette merged)
   - Utility classes used everywhere
   - Form controls (inputs, selects, sliders, labels)
   - Buttons (.btn, .btn-primary, .btn-secondary, .cad-btn family)
   - .panel / .panel-header / .panel-body collapsible system
   - Modal system (.modal-overlay/.modal-window and .cad-modal-* family)
   - Settings panel + theme dropdown
   - .cad-* component palette (navbar, dialog, accordions, status, tabs,
     selection, tools, etc.) used by frame-builder / inspector / template-maker

   NOTE: The .ttf files under b-spline-gen/html/fonts/ are stamp assets
   loaded directly by opentype.js in editor-geometry.js to convert text
   into SVG paths. They are NOT CSS web fonts — no @font-face block here.
   ========================================================================= */

/* =========================================================================
   1. Reset
   ========================================================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    font-family: inherit;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    touch-action: none;
    /* Prevent browser handling of touch gestures */
    -webkit-overflow-scrolling: touch;
    background: var(--bg);
    color: var(--text);
    font-family: var(--cad-font-family);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

input, select, textarea, button {
    font-family: var(--cad-font-family);
}

/* =========================================================================
   3. Design tokens
   ========================================================================= */
:root {
    /* Base Spacing & Sizing */
    --cad-border-width: 1px;
    --cad-radius-sm: 2px;
    --cad-radius-md: 4px;
    --cad-radius-lg: 8px;
    --cad-gap: 12px;
    --cad-panel-body-padding: 12px;

    /* Semantic Color Palette (from CADpanel & cadstyle) */
    --cad-bg-standard: #ffffff;
    --cad-bg-secondary: #f3f3f3;
    --cad-bg-tertiary: #e0e0e0;
    --cad-border-standard: #ddd;
    --cad-border-focus: #4a9eff;

    /* Animations & Transitions */
    --cad-transition-fast: 0.15s ease;
    --cad-transition-standard: 0.25s ease;
    --cad-border-soft: #eeeeee;

    --cad-accent-blue: #0696D7;
    --cad-accent-hover: #057fb5;
    --cad-accent-green: #34a853;

    --cad-text-main: #333333;
    --cad-text-muted: #666666;

    /* Typography */
    --cad-font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* b-spline-gen palette tokens (merged from shared-style.css) */
    --bg: #f3f3f3;
    --surface: #ffffff;
    --surface2: #e8e8e8;
    --border: #d1d1d1;
    --accent: #0066cc;
    --accent2: #5a30e8;
    --text: #222222;
    --muted: #555555;
    --good: #208a4f;
    --gap: 12px;
    --r: 8px;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --surface-mid: #f8fafc;
    --text-dim: #64748b;
    --panel-body-padding: 12px;
}

/* =========================================================================
   4. Universal utilities
   ========================================================================= */
.hidden {
    display: none !important;
}

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

.flex-row-spread {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

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

.row label {
    flex: 1;
}

.row2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.label-divider {
    border-bottom: 1px solid #ddd;
    padding-bottom: 8px;
    margin-bottom: 8px;
}

.label-inline {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.mt-4 {
    margin-top: 4px;
}

.input-xs {
    width: 60px;
    flex-shrink: 0;
}

.select-sm {
    width: 140px;
    max-width: 100%;
}

.panel-divider {
    margin-top: 16px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.panel-spaced {
    margin-top: 24px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.tip {
    font-size: 11px;
    color: var(--muted);
    line-height: 1.4;
    background: rgba(0, 102, 204, .01);
    border-left: 2px solid var(--accent);
    padding: 6px 10px;
}

/* =========================================================================
   5. Form controls
   ========================================================================= */
label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 12px;
    color: var(--muted);
}

label span {
    color: var(--text);
    font-weight: 500;
}

input[type=number],
input[type=text],
select {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 5px 8px;
    color: var(--text);
    font: inherit;
}

.slider-container {
    width: 100%;
}

.slider-container input[type=range] {
    width: 100%;
    accent-color: var(--accent);
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.slider-row input[type=range] {
    flex: 1;
    accent-color: var(--cad-accent-blue);
}

.slider-row input[type=number] {
    width: 62px;
    flex-shrink: 0;
}

.slider-wrap {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.slider-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.slider-name {
    font-size: 12px;
    font-weight: 700;
    color: var(--cad-text-main);
}

.slider-val {
    font-size: 12px;
    color: var(--cad-text-muted);
    min-width: 48px;
    text-align: right;
}

.lock-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-dim);
    cursor: pointer;
    user-select: none;
}

.lock-toggle input[type=checkbox] {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--accent);
}

.checkbox-custom {
    width: 14px;
    height: 14px;
    border: 1px solid #707070;
    background: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 1px;
    cursor: pointer;
}

.checkbox-custom.checked {
    background: #666666;
    border-color: #666666;
}

.checkbox-custom.checked::after {
    content: '✔';
    font-size: 10px;
    color: #ffffff;
    font-weight: bold;
}

/* =========================================================================
   6. Buttons
   ========================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    border-radius: 6px;
    padding: 9px 14px;
    font: 600 13px/1 inherit;
    cursor: pointer;
}

.btn-primary {
    background: var(--cad-accent-blue);
    color: #ffffff;
}

.btn-secondary {
    background: var(--cad-bg-tertiary);
    border: 1px solid var(--cad-border-standard);
    color: var(--cad-text-main);
}

.btn-xs {
    padding: 5px 10px;
    font-size: 11px;
}

.btn-icon {
    height: 32px;
    width: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-wide {
    width: 100%;
    height: 32px;
}

.cad-ui-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: 6px;
    padding: 9px 14px;
    font: 600 13px/1 inherit;
    cursor: pointer;
    border: none;
    background: transparent;
    color: inherit;
    transition: background var(--cad-transition-fast), color var(--cad-transition-fast), border-color var(--cad-transition-fast);
}

/* Stepper */
.stepper-container {
    display: flex;
    align-items: center;
    background: var(--cad-bg-tertiary);
    border: 1px solid var(--cad-border-standard);
    border-radius: 4px;
    overflow: hidden;
    height: 28px;
}

.stepper-container input {
    border: none !important;
    min-width: 50px !important;
    flex: 1;
    text-align: center;
    background: transparent !important;
    padding: 0 6px !important;
    margin: 0 !important;
    font-weight: 600;
    -moz-appearance: textfield;
    appearance: none;
}

.stepper-container input::-webkit-outer-spin-button,
.stepper-container input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.stepper-btn {
    background: var(--cad-bg-standard);
    border: none;
    width: 24px;
    height: 100%;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cad-accent-blue);
    transition: background var(--cad-transition-fast);
}

.stepper-btn:hover {
    background: #e0e0e0;
}

.stepper-btn:active {
    background: #d0d0d0;
}

/* Tab buttons (.btn-style tabs distinct from .tab-bar / cad-text-tabs) */
.tab-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.06);
    color: var(--cad-text-muted);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: rgba(255, 255, 255, 0.36);
    color: var(--cad-text-main);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
    border-color: rgba(0, 0, 0, 0.08);
}

.tab-btn:hover:not(.active) {
    background: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.12);
}

.tab-content {
    display: none;
    flex-direction: column;
    gap: var(--cad-gap);
}

.tab-content.active {
    display: flex;
}

/* Tab bar */
.tab-bar {
    display: flex;
    background: rgba(255, 255, 255, 0.08);
    border-bottom: 1px solid var(--border);
    padding: 4px;
    gap: 4px;
}

/* Logo / Badge */
.logo {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.04em;
}

.badge {
    font-size: 10px;
    background: var(--surface2);
    border: 1px solid var(--border);
    padding: 2px 7px;
    border-radius: 99px;
    color: var(--muted);
}

/* Header (purely visual base — layout/grid placement lives in layout-app.css) */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 10px 18px;
    display: flex;
    align-items: center;
    gap: 14px;
}

/* =========================================================================
   7. Main content + Panel system
   ========================================================================= */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--cad-gap);
    background: var(--cad-bg-secondary);
}

.panel {
    background: rgba(255, 255, 255, 0.7);
    border-left: 3px solid #ccc;
    border-radius: var(--cad-radius-lg);
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.panel-header {
    padding: 9px 12px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #111;
    background: rgba(0, 0, 0, 0.05);
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.panel-header::before {
    content: '▼';
    font-size: 14px;
    transition: transform 0.2s;
    width: 16px;
    display: inline-block;
    text-align: center;
    opacity: 0.6;
}

.panel.collapsed .panel-header::before,
.panel-header.collapsed::before {
    transform: rotate(-90deg);
}

.panel-body {
    padding: var(--cad-panel-body-padding) !important;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.panel.collapsed .panel-body {
    display: none;
}

/* =========================================================================
   8. Settings panel
   ========================================================================= */
.settings-panel {
    position: fixed;
    top: 0;
    right: -320px;
    width: 320px;
    height: 100vh;
    background: var(--surface);
    box-shadow: -4px 0 15px rgba(0, 0, 0, 0.1);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2002;
    display: flex;
    flex-direction: column;
}

.settings-panel:not(.hidden) {
    right: 0;
}

.settings-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-mid);
}

.settings-header h3 {
    margin: 0;
    font-size: 16px;
}

.settings-body {
    padding: 20px;
    flex: 1;
    overflow-y: auto;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.setting-row label {
    font-size: 13px;
    color: var(--text);
    font-weight: 500;
}

.setting-row input {
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 60px;
    text-align: right;
}

.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 2001;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.settings-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

/* =========================================================================
   9. Theme dropdown
   ========================================================================= */
#theme-control {
    position: relative;
    display: inline-flex;
    align-items: center;
}

#theme-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-color: var(--border);
    color: var(--text);
    background: var(--surface2);
}

.theme-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 180px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.12);
    z-index: 1200;
    overflow: hidden;
}

.theme-dropdown.hidden {
    display: none;
}

.theme-dropdown button {
    all: unset;
    display: block;
    width: 100%;
    padding: 10px 12px;
    color: var(--text);
    cursor: pointer;
    font: 13px/1.4 inherit;
}

.theme-dropdown button:hover,
.theme-dropdown button.active {
    background: var(--surface2);
}

/* =========================================================================
   10. Modal system (b-spline-gen .modal-* family)
   ========================================================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(2px);
    z-index: 9999;
    display: none;
    /* Controlled by JS / Inline style */
    align-items: center;
    justify-content: center;
}

.modal-window {
    background: var(--surface);
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    max-width: 95vw;
    max-height: 95vh;
    overflow: hidden;
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface-mid);
}

.modal-header h3 {
    margin: 0;
    font-size: 16px;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: var(--surface-mid);
}

/* Shared editor keyboard drag handle */
.editor-symbol-keyboard-grip {
    width: 34px;
    height: 4px;
    border-radius: 999px;
    background: rgba(0,0,0,0.18);
    cursor: ns-resize;
    flex: 0 0 auto;
    margin-bottom: 2px;
    transition: background 0.16s ease;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

.editor-symbol-keyboard.grabbing .editor-symbol-keyboard-grip {
    background: rgba(0,0,0,0.28);
}

/* Wizard Enhancements */
#exportWizardModal .modal-window {
    width: 420px;
    max-height: 90vh;
}

.wizard-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    padding: 16px;
    overflow-y: auto;
}

.wizard-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    padding: 12px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    cursor: pointer;
    transition: 0.2s;
    position: relative;
}

.wizard-option:hover {
    background: var(--surface);
    border-color: var(--accent);
}

.wizard-option input {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 0;
}

.wizard-icon {
    font-size: 1.4rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border-radius: 6px;
    border: 1px solid var(--border);
    margin-top: 4px;
}

.wizard-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.wizard-info .title {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text);
}

.wizard-info .desc {
    display: none;
}

.wizard-option.disabled {
    opacity: 0.3;
    pointer-events: none;
    filter: grayscale(1);
}

/* =========================================================================
   11. Pulse animations + status lights
   ========================================================================= */
@keyframes cad-pulse-live {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); transform: scale(1); }
    70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); transform: scale(1.05); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); transform: scale(1); }
}

@keyframes cad-pulse-warn {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); transform: scale(1); }
    70% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); transform: scale(1.05); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); transform: scale(1); }
}

.cad-status-light {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: var(--cad-transition-standard);
}

.cad-status-light.live {
    background-color: var(--cad-accent-green);
    animation: cad-pulse-live 2s infinite;
}

.cad-status-light.dead {
    background-color: var(--cad-accent-red);
    animation: cad-pulse-warn 3s infinite;
}

/* =========================================================================
   12. Native CAD shell layout (used by frame-builder, inspector,
       template-maker, bspline_gen_palette)
   ========================================================================= */
.cad-app-shell,
.cad-app-layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-family: var(--cad-font-family);
    background-color: #f5f5f5;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.cad-navbar {
    background-color: #ffffff;
    border-bottom: var(--cad-border-width) solid var(--cad-border-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    height: 36px;
    width: 100%;
    z-index: 50;
}

.cad-nav-group {
    display: flex;
    align-items: center;
    gap: 24px;
}

.cad-nav-title {
    color: #1e40af;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: -0.025em;
}

.cad-nav-links {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
}

.cad-nav-link {
    color: #6b7280;
    padding: 4px;
    text-decoration: none;
    transition: color 0.15s;
}

.cad-nav-link:hover {
    color: #1f2937;
}

.cad-nav-link.active {
    color: #1d4ed8;
    border-bottom: 2px solid #2563eb;
    font-weight: 600;
}

.cad-nav-icons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.cad-nav-icon {
    color: #6b7280;
    font-size: 18px;
    cursor: pointer;
}

.cad-workspace {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.cad-viewport-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.3;
    filter: grayscale(100%);
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cad-viewport-img {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

.cad-footer-bar {
    background-color: #f3f4f6;
    border-top: var(--cad-border-width) solid var(--cad-border-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    height: 32px;
    width: 100%;
    z-index: 50;
}

.cad-footer-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.cad-footer-text {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    color: #6b7280;
}

.cad-footer-link {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    color: #6b7280;
    cursor: pointer;
}

.cad-footer-link:hover {
    color: #1f2937;
}

/* =========================================================================
   13. Native CAD Dialog component
   ========================================================================= */
.cad-dialog {
    background-color: #fcfcfc;
    border: var(--cad-border-width) solid var(--cad-border-color);
    border-radius: var(--cad-radius-md);
    box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.12);
    width: 350px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    max-height: 90vh;
    resize: both;
    overflow: hidden;
}

.cad-sidebar-panel {
    display: flex;
    flex-direction: column;
    width: 100%;
    flex-shrink: 0;
    background-color: transparent;
}

.cad-header,
.cad-accordion-header {
    padding: 5px 8px;
    display: flex;
    align-items: center;
    background-color: #edeef0;
    border: none;
    cursor: pointer;
    font-size: 11px;
    font-weight: 700;
    color: #444;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.cad-accordion-header.dark {
    background-color: #e5e7eb;
    padding-left: 16px;
}

.cad-accordion-header.dark + .cad-accordion-body {
    padding-left: 16px;
}

.cad-header-minimize,
.cad-accordion-icon {
    margin-right: 6px;
    font-size: 12px;
    color: #555;
    transition: transform 0.2s;
    font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 20;
}

.collapsed .cad-header-minimize,
.collapsed .cad-accordion-icon {
    transform: rotate(-90deg);
}

.cad-dialog-content.collapsed,
.cad-accordion-body.collapsed,
.cad-indented-row.collapsed {
    display: none !important;
}

.cad-dialog-content {
    padding: 4px 0;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.cad-field-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    align-items: center;
    padding: 4px 8px;
}

.cad-label {
    font-size: 12px;
    color: #333;
}

/* Shared Control Base */
.cad-input,
.cad-btn,
.cad-select-wrap,
.cad-nested-input {
    height: 24px;
    border-radius: var(--cad-radius-sm);
    font-size: 11.5px;
    transition: all 0.05s;
    display: inline-flex;
    align-items: center;
    box-sizing: border-box;
}

.cad-input {
    border: var(--cad-border-width) solid #ccc;
    padding: 0 4px;
    width: 100%;
    background-color: #ffffff;
}

.cad-input:hover {
    border: 1.5px solid #a0a0a0;
}

.cad-textarea {
    width: 100%;
    min-height: 120px;
    border: var(--cad-border-width) solid var(--cad-border-color);
    border-radius: var(--cad-radius-sm);
    padding: 8px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 11.5px;
    line-height: 1.5;
    background-color: #ffffff;
    resize: vertical;
    outline: none;
    color: #1a2634;
}

.cad-textarea:focus {
    border-color: #00a2e8;
}

.cad-select-wrap {
    position: relative;
    background-color: #ffffff;
    border: var(--cad-border-width) solid #bcbcbc;
    padding: 0 4px;
    width: 100%;
}

.cad-select-wrap:hover {
    border: 1.5px solid #a0a0a0;
}

.cad-select-icon {
    font-size: 14px;
    margin-right: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 16px;
    pointer-events: none;
    z-index: 1;
}

.cad-select-icon-blue {
    color: #3b82f6;
}

.cad-select {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: transparent;
    border: none;
    font-size: 11.5px;
    appearance: none;
    outline: none;
    z-index: 2;
    cursor: pointer;
    padding-left: 24px;
    padding-right: 16px;
}

.cad-select-no-icon {
    padding-left: 6px !important;
}

.cad-select-arrow {
    font-size: 8px;
    color: #9ca3af;
    pointer-events: none;
    margin-left: auto;
    z-index: 1;
}

.cad-nested-input {
    background-color: #ffffff;
    border: var(--cad-border-width) solid var(--cad-border-soft);
    padding: 0 4px;
    width: 80px;
}

.cad-nested-input:hover {
    border: 1.5px solid #a0a0a0;
}

.cad-nested-input.disabled {
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
    width: 64px;
    opacity: 0.5;
}

.cad-nested-input input {
    width: 100%;
    font-size: 11px;
    border: none;
    padding: 0;
    outline: none;
    background-color: transparent;
}

/* =========================================================================
   14. Native CAD Selection Box
   ========================================================================= */
.cad-selection-box {
    border: var(--cad-border-width) solid var(--cad-border-color);
    border-radius: var(--cad-radius-sm);
    margin: 4px 8px 0 8px;
    min-height: 120px;
    background: #fff;
    position: relative;
}

.cad-selection-item {
    background-color: #e5f3ff;
    display: flex;
    align-items: center;
    padding: 4px 8px;
    font-size: 12px;
    gap: 8px;
}

.cad-selection-count {
    font-size: 12px;
}

.cad-selection-config {
    display: flex;
    align-items: center;
    margin-left: auto;
    gap: 4px;
}

.cad-selection-tag {
    display: flex;
    align-items: center;
    margin-left: 8px;
    font-size: 11px;
    gap: 4px;
}

.cad-selection-tag-icon {
    font-size: 14px;
    color: #2563eb;
}

.cad-selection-tools {
    position: absolute;
    bottom: 4px;
    left: 4px;
    display: flex;
    gap: 8px;
}

/* =========================================================================
   15. Native CAD Buttons & Icons
   ========================================================================= */
.cad-icon-btn {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #666;
    cursor: pointer;
}

.cad-icon-btn.small {
    font-size: 12px;
}

.cad-icon-btn:hover {
    background-color: #eee;
}

.cad-btn {
    min-width: 75px;
    border: 1px solid #bcbcbc;
    background: #ffffff;
    color: #333;
    justify-content: center;
    padding: 0 12px;
    cursor: pointer;
}

.cad-btn:hover {
    border: 1.5px solid #a0a0a0;
    background: #ffffff;
}

.cad-btn-primary {
    background: #0696D7;
    color: #ffffff;
    border: 1px solid #057fb5;
    font-weight: 500;
}

.cad-btn-primary:hover {
    background: #058ac7;
    border: 1.5px solid #5db0e5;
}

.cad-btn.disabled {
    background: #f4f4f4;
    color: #a0a0a0;
    border: var(--cad-border-width) solid #d9d9d9;
    cursor: default;
}

.cad-select-button {
    border: var(--cad-border-width) solid var(--cad-border-soft);
    background: #ffffff;
    border-radius: var(--cad-radius-sm);
    padding: 0 8px;
    height: 22px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    transition: all 0.1s;
}

.cad-select-button:hover {
    background: #f3f4f6;
    border-color: #9ca3af;
}

.cad-select-button.active,
.cad-select-button.selecting {
    border: 1.5px solid #5db0e5;
    background: #e5f3ff;
    color: #333;
}

.cad-select-button.active:hover {
    background: #d1e9ff;
    border-color: #008cd2;
}

.cad-cursor-icon {
    width: 14px;
    height: 14px;
    display: inline-block;
}

.cad-cursor-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0px 1px 1px rgba(0, 0, 0, 0.1));
}

.cad-cursor-path {
    fill: #ffffff;
    stroke: #444444;
    stroke-width: 1.5px;
    stroke-linejoin: round;
}

.cad-select-button svg,
.cad-select-button .material-symbols-outlined {
    color: #4b5563;
}

.material-symbols-outlined {
    font-size: 16px;
}

/* =========================================================================
   16. Native CAD Utilities
   ========================================================================= */
.cad-divider-hr {
    border-top: var(--cad-border-width) solid var(--cad-border-soft);
    margin: 4px 8px;
}

.cad-mt-2 {
    margin-top: 8px;
}

.cad-h-2 {
    height: 8px;
}

.cad-footer {
    border-top: var(--cad-border-width) solid #e0e0e0;
    border-bottom-left-radius: var(--cad-radius-md);
    border-bottom-right-radius: var(--cad-radius-md);
    padding: 8px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    background-color: #fcfcfc;
}

.cad-footer-info {
    margin-right: auto;
    align-self: center;
}

.cad-footer-info-icon {
    font-size: 14px;
    color: #9ca3af;
    background-color: #e5e7eb;
}

/* =========================================================================
   17. Native CAD Top-Level Tabs (Text-Based)
   ========================================================================= */
.cad-text-tabs-bar {
    display: flex;
    border-bottom: var(--cad-border-width) solid var(--cad-border-soft);
    padding: 0 16px;
    background-color: #f3f4f6;
}

.cad-text-tab-item {
    padding: 8px 16px;
    font-size: 13px;
    color: #4b5563;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    margin-bottom: -1px;
}

.cad-text-tab-item:hover {
    color: #1f2937;
}

.cad-text-tab-item.active {
    color: #1f2937;
    border-bottom-color: #0696D7;
    font-weight: 500;
}

/* =========================================================================
   18. Native CAD Multi-Column Layouts
   ========================================================================= */
.cad-split-view {
    display: flex;
    width: 100%;
    flex: 1;
    overflow: hidden;
}

.cad-split-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 8px 8px 16px 8px;
    overflow-y: auto;
}

.cad-split-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 8px;
    background-color: #f9fafb;
    border-left: var(--cad-border-width) solid var(--cad-border-soft);
    overflow-y: auto;
}

/* =========================================================================
   19. Native CAD Headers & Status Indicators
   ========================================================================= */
.cad-status-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background-color: #eef7ff;
    border-bottom: var(--cad-border-width) solid #c7ddf7;
    font-size: 11.5px;
    color: #175a99;
}

.cad-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #2f7d3f;
}

.cad-status-label {
    font-weight: 700;
}

.cad-section-header {
    font-size: 15px;
    color: #4b5563;
    font-weight: 400;
    margin-top: 16px;
    margin-bottom: 8px;
    padding-left: 8px;
}

.cad-section-header:first-child {
    margin-top: 8px;
}

.cad-field-row-wide {
    display: grid;
    grid-template-columns: 160px 1fr;
    align-items: center;
    padding: 2px 8px;
    min-height: 28px;
}

/* =========================================================================
   20. Accordion / Collapsible Groups
   ========================================================================= */
.cad-accordion-header,
.cad-checkbox-header {
    padding: 6px 8px;
    display: flex;
    align-items: center;
    font-size: 12px;
    font-weight: 600;
    color: #1f2937;
    cursor: pointer;
    margin-bottom: 2px;
}

.cad-accordion-header {
    background-color: #f3f4f6;
}

.cad-checkbox-header {
    padding: 8px 8px 8px 4px;
    border-top: var(--cad-border-width) solid var(--cad-border-soft);
}

.cad-accordion-header.dark {
    background-color: #e5e7eb;
}

.cad-accordion-icon {
    font-size: 14px;
    margin-right: 8px;
    color: #6b7280;
    transition: transform 0.2s;
}

.cad-accordion-header.collapsed .cad-accordion-icon {
    transform: rotate(-90deg);
}

.cad-accordion-body {
    padding-left: 2px;
    padding-right: 2px;
    margin-bottom: 8px;
}

.cad-accordion-body.collapsed {
    display: none;
}

/* =========================================================================
   21. Input Groups
   ========================================================================= */
.cad-input-group {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

/* =========================================================================
   22. Tool Palette UI Patterns
   ========================================================================= */
.cad-icon-tabs {
    display: flex;
    background-color: #f3f4f6;
    border-bottom: var(--cad-border-width) solid var(--cad-border-color);
    padding-left: 4px;
}

.cad-icon-tab {
    width: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 30px;
    cursor: pointer;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    border-bottom: 1px solid transparent;
    color: #4b5563;
    transition: background-color var(--cad-transition-fast), border-color var(--cad-transition-fast), transform 0.12s;
    user-select: none;
    font-size: 18px;
    margin-bottom: -1px;
    z-index: 1;
}

.cad-icon-tab:hover:not(.active) {
    background-color: #e5e7eb;
}

.cad-icon-tab.active {
    background-color: #ffffff;
    color: #1f2937;
    border-left: var(--cad-border-width) solid var(--cad-border-color);
    border-right: var(--cad-border-width) solid var(--cad-border-color);
    border-bottom: var(--cad-border-width) solid #ffffff;
    z-index: 2;
}

.cad-checkbox-header {
    padding-left: 16px;
    display: flex;
    align-items: center;
}

.cad-checkbox-header .checkbox-custom {
    margin-right: 8px;
    margin-left: 0;
}

.cad-indented-row {
    padding-left: 40px;
}

.cad-inner-table {
    border: var(--cad-border-width) solid var(--cad-border-soft);
    border-radius: var(--cad-radius-sm);
    background-color: #ffffff;
    width: 100%;
    margin-top: 4px;
    display: flex;
    flex-direction: column;
}

.cad-table-header {
    display: flex;
    font-size: 10px;
    color: #6b7280;
    padding: 4px 8px;
    border-bottom: var(--cad-border-width) solid var(--cad-border-soft);
}

.cad-table-row {
    display: flex;
    align-items: center;
    padding: 4px 8px;
    border-bottom: var(--cad-border-width) solid var(--cad-border-soft);
}

.cad-table-toolbar {
    display: flex;
    background-color: #f9fafb;
    padding: 4px;
    gap: 4px;
}

.cad-table-toolbar .cad-icon-btn {
    color: #9ca3af;
}

.cad-table-toolbar .cad-icon-btn:hover {
    color: #374151;
}

.cad-static-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    align-items: center;
    padding: 4px 8px;
}

.cad-static-value {
    font-size: 12px;
    color: #4b5563;
}

/* =========================================================================
   23. Native CAD App Layout (multi-panel shells used by frame-builder)
   ========================================================================= */
.cad-app-header {
    height: 32px;
    background: var(--cad-bg-standard);
    border-bottom: 1px solid var(--cad-border-standard);
    display: flex;
    align-items: center;
    padding: 0 8px;
    flex-shrink: 0;
    gap: 8px;
    z-index: 10;
}

.cad-app-body {
    display: grid;
    grid-template-columns: var(--sidebar-width, 240px) 6px 1fr;
    flex: 1;
    overflow: hidden;
}

.cad-app-sidebar {
    grid-column: 1;
    background: #f5f5f5;
    border-right: none;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    min-height: 0;
}

#cad-resizer {
    grid-column: 2;
    background: #f0f0f0;
    border-left: 1px solid var(--cad-border-standard);
    border-right: 1px solid var(--cad-border-standard);
    cursor: col-resize;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.1s;
}

#cad-resizer:hover,
#cad-resizer.resizing {
    background: var(--cad-accent-blue);
    border-color: var(--cad-accent-blue);
}

#cad-resizer::after {
    content: '';
    width: 2px;
    height: 20px;
    background: #ccc;
    border-radius: 1px;
}

.cad-app-main {
    grid-column: 3;
    background: #ddd;
    position: relative;
    overflow: hidden;
}

/* =========================================================================
   24. Complex Sidebar Controls (Native CAD)
   ========================================================================= */
.cad-slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
}

input[type="range"].cad-slider {
    -webkit-appearance: none;
    flex: 1;
    min-width: 20px;
    height: 4px;
    background: #e0e0e0;
    border-radius: 2px;
    outline: none;
    margin: 0;
}

input[type="range"].cad-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--cad-accent-blue);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cad-btn-tool {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 32px;
    flex: 1;
    background: #f0f0f0;
    border: 1px solid var(--cad-border-standard);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    color: var(--cad-text-main);
    cursor: pointer;
    transition: all 0.1s;
}

.cad-btn-tool:hover {
    background: #e8e8e8;
    border-color: #bbb;
}

.cad-btn-tool.active {
    background: #fff;
    border-color: var(--cad-accent-blue);
    box-shadow: 0 0 0 1px var(--cad-accent-blue);
}

.cad-btn-tool .material-symbols-outlined {
    font-size: 16px;
}

.cad-action-row {
    display: flex;
    gap: 4px;
    margin-top: 8px;
}

.cad-action-row .cad-btn {
    flex: 1;
    padding: 4px;
    font-size: 10px;
    height: 22px;
    background: #f5f5f5;
}

.cad-accordion-wrap.accent-green {
    border-left: 3px solid var(--cad-accent-green);
}

.cad-accordion-header span.material-symbols-outlined {
    font-size: 14px;
    margin-right: 6px;
    opacity: 0.8;
}

/* =========================================================================
   25. Native CAD Modal & Dialog System
   ========================================================================= */
.cad-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.cad-modal-window {
    background: var(--cad-bg-standard);
    border: 1px solid #777;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border-radius: 2px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    max-width: 95vw;
    max-height: 95vh;
}

.cad-modal-header {
    background: #e8e8e8;
    border-bottom: 1px solid var(--cad-border-standard);
    padding: 4px 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    font-size: 11px;
    color: #333;
    flex-shrink: 0;
}

.cad-modal-body {
    flex: 1;
    overflow: hidden;
    background: var(--cad-bg-standard);
}

.cad-modal-footer {
    background: #e8e8e8;
    border-top: 1px solid var(--cad-border-standard);
    padding: 8px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    flex-shrink: 0;
}

.cad-btn.active {
    background-color: var(--cad-accent-blue) !important;
    color: white !important;
    border-color: var(--cad-accent-blue) !important;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2) !important;
}

/* =========================================================================
   26. Native CAD Tool Group Patterns
   ========================================================================= */
.cad-tool-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    background: var(--cad-bg-tertiary);
    padding: 2px;
    border-radius: var(--cad-radius-md);
    margin-bottom: 12px;
}

.cad-tool-btn {
    height: 48px !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    gap: 4px !important;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--cad-text-muted);
    font-size: 9px !important;
    font-weight: 700 !important;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.15s;
}

.cad-tool-btn .material-symbols-outlined {
    font-size: 20px !important;
}

.cad-tool-btn.active {
    background: var(--cad-bg-standard) !important;
    color: var(--cad-accent-blue) !important;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12) !important;
    border-radius: var(--cad-radius-sm);
}