/* ============================================================
   Bare-bones App - Stylesheet
   Same palette & formatting as the original Serial Dilution Calculator
   ============================================================ */

/* ---------- Local Inter Font -------------------------------- */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300 700;
    font-display: swap;
    src: url('../fonts/inter-latin.woff2') format('woff2');
}

/* ---------- CSS Variables (Light / Dark) -------------------- */
:root {
    --medium-rgb: 95,151,197;
    --medium:  #5f97c5;
    --medium2: #255a85;
    --dark1:   #002e48;
    --dark2:   #0a4a6e;
    --dark3:   #103d5e;

    --body-bg:     #e9eef2;
    --card-bg:     #ffffff;
    --card-border: rgba(0,0,0,0.06);
    --text-primary:   #1a2b3c;
    --text-secondary: #5c7080;
    --text-muted:     #8a9ba8;

    --accent:       #0275d8;
    --accent-hover: #0166be;
    --accent-glow:  rgba(2,117,216,0.25);

    --tube-start: #0366A0;
    --tube-end:   #00bcd7;
    --tube-start-rgb: 3,102,160;
    --tube-end-rgb:   0,188,215;

    --navbar-height: 48px;
    --sidebar-width: 220px;

    --toolbar-bg: rgba(255,255,255,0.94);
    --toolbar-border: rgba(0,0,0,0.10);

    --t-fast: 150ms;
    --t-med:  250ms;
    --t-slow: 400ms;

    --r-xs: 4px;
    --r-sm: 6px;
    --r-md: 10px;
    --r-lg: 16px;
    --r-xl: 24px;

    --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
    --shadow-md:  0 4px 12px rgba(0,0,0,0.10);
    --shadow-lg:  0 8px 30px rgba(0,0,0,0.15);
    --shadow-xl:  0 12px 48px rgba(0,0,0,0.20);
    --shadow-lift: 0 6px 20px rgba(0,0,0,0.14);
}

/* Dark theme overrides */
[data-theme="dark"] {
    --body-bg:     #0d1b2a;
    --card-bg:     #1b2838;
    --card-border: rgba(255,255,255,0.06);
    --text-primary:   #e0e8f0;
    --text-secondary: #8aa0b8;
    --text-muted:     #5a7088;
    --toolbar-bg: rgba(31,45,61,0.94);
    --toolbar-border: rgba(255,255,255,0.12);
    --shadow-sm:  0 1px 3px rgba(0,0,0,0.3);
    --shadow-md:  0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg:  0 8px 30px rgba(0,0,0,0.5);
    --shadow-xl:  0 12px 48px rgba(0,0,0,0.6);
    --shadow-lift: 0 6px 20px rgba(0,0,0,0.45);
}

/* ---------- Reset / Base ------------------------------------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--body-bg);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    transition: background-color var(--t-slow) ease, color var(--t-slow) ease;
}

/* ---------- Splash Screen ----------------------------------- */
#splash-screen {
    position: fixed; inset: 0;
    z-index: 99999;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(150deg, #002e48 0%, #0a4a6e 40%, #255a85 100%);
    transition: opacity 0.7s ease, visibility 0.7s ease;
}

#splash-screen.splash-fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.splash-content {
    display: flex; flex-direction: column; align-items: center;
    user-select: none;
}

.splash-icon-wrap {
    width: 130px; height: 130px;
    margin-bottom: 4px;
    animation: splash-float 2.5s ease-in-out infinite;
}

.splash-icon {
    width: 100%; height: 100%;
    filter: drop-shadow(0 4px 20px rgba(95,151,197,0.4));
    transform-origin: center;
    transform-box: fill-box;
    transform: scale(-1, -1);
}

.splash-teapot-fill {
    fill: #b7dfff;
    opacity: 0;
    transform-origin: 60px 60px;
    transform: scale(0.97);
    animation: splash-teapot-fill-in 0.5s ease 1.6s forwards;
}

/* Default wireframe path styles */
.splash-wireframe path {
    fill: none;
    stroke: rgba(173, 228, 255, 0.95);
    stroke-width: 1.4;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 120;
    stroke-dashoffset: 120;
    animation: splash-wire-draw 1.2s ease forwards, splash-wire-fade 0.4s ease 1.5s forwards;
}

/* Outer outline + handle hole — longer perimeter needs larger dasharray */
.splash-wireframe path:nth-child(1) {
    stroke-dasharray: 420;
    stroke-dashoffset: 420;
    stroke-width: 1.8;
}
.splash-wireframe path:nth-child(2) {
    stroke-dasharray: 180;
    stroke-dashoffset: 180;
}

/* Stagger each wireframe child for progressive reveal
   children: 1=outline, 2=handle-hole, 3-15=h-sections, 16-22=v-meridians */
.splash-wireframe path:nth-child(1)  { animation-delay: 0.00s, 1.50s; }
.splash-wireframe path:nth-child(2)  { animation-delay: 0.06s, 1.52s; }
.splash-wireframe path:nth-child(3)  { animation-delay: 0.10s, 1.53s; }
.splash-wireframe path:nth-child(4)  { animation-delay: 0.14s, 1.54s; }
.splash-wireframe path:nth-child(5)  { animation-delay: 0.18s, 1.55s; }
.splash-wireframe path:nth-child(6)  { animation-delay: 0.22s, 1.56s; }
.splash-wireframe path:nth-child(7)  { animation-delay: 0.26s, 1.57s; }
.splash-wireframe path:nth-child(8)  { animation-delay: 0.30s, 1.58s; }
.splash-wireframe path:nth-child(9)  { animation-delay: 0.34s, 1.59s; }
.splash-wireframe path:nth-child(10) { animation-delay: 0.38s, 1.60s; }
.splash-wireframe path:nth-child(11) { animation-delay: 0.42s, 1.61s; }
.splash-wireframe path:nth-child(12) { animation-delay: 0.46s, 1.62s; }
.splash-wireframe path:nth-child(13) { animation-delay: 0.50s, 1.63s; }
.splash-wireframe path:nth-child(14) { animation-delay: 0.54s, 1.64s; }
.splash-wireframe path:nth-child(15) { animation-delay: 0.58s, 1.65s; }
.splash-wireframe path:nth-child(16) { animation-delay: 0.62s, 1.66s; }
.splash-wireframe path:nth-child(17) { animation-delay: 0.66s, 1.67s; }
.splash-wireframe path:nth-child(18) { animation-delay: 0.70s, 1.68s; }
.splash-wireframe path:nth-child(19) { animation-delay: 0.74s, 1.69s; }
.splash-wireframe path:nth-child(20) { animation-delay: 0.78s, 1.70s; }
.splash-wireframe path:nth-child(21) { animation-delay: 0.82s, 1.71s; }
.splash-wireframe path:nth-child(22) { animation-delay: 0.86s, 1.72s; }

.splash-title {
    font-size: 1.6rem; font-weight: 600;
    color: #fff; letter-spacing: 0.5px;
    margin-bottom: 2px;
    opacity: 0; animation: splash-text 0.6s ease 0.4s forwards;
}

.splash-subtitle {
    font-size: 0.78rem; font-weight: 500;
    color: rgba(255,255,255,0.5);
    letter-spacing: 2px; text-transform: uppercase;
    margin-bottom: 36px;
    opacity: 0; animation: splash-text 0.6s ease 0.6s forwards;
}

@keyframes splash-wire-draw {
    to { stroke-dashoffset: 0; }
}

@keyframes splash-wire-fade {
    to { opacity: 0; }
}

@keyframes splash-teapot-fill-in {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes splash-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

@keyframes splash-text {
    to { opacity: 1; }
}

/* ---------- App Container ----------------------------------- */
.app-hidden {
    opacity: 0;
    visibility: hidden;
}

#app {
    display: flex; flex-direction: column;
    height: 100vh;
    transition: opacity 0.5s ease 0.1s, visibility 0.5s ease 0.1s;
}

#app.app-visible {
    opacity: 1;
    visibility: visible;
}

/* ---------- Navigation Bar ---------------------------------- */
.navbar {
    height: var(--navbar-height);
    background: var(--body-bg);
    display: flex; align-items: center;
    padding: 0 14px;
    flex-shrink: 0;
    z-index: 100;
    position: relative;
    transition: background var(--t-slow) ease;
}

.navbar::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--tube-start), var(--tube-end), var(--tube-start));
    background-size: 200% 100%;
    animation: navbar-shine 6s linear infinite;
    opacity: 0.7;
}

@keyframes navbar-shine {
    0%   { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

#btn-sidebar-toggle {
    font-size: 1.15rem;
    margin-right: 4px;
}

.navbar-brand {
    display: flex; align-items: center; gap: 12px;
    padding-left: 4px;
    margin-right: auto;
}

.navbar-logo {
    width: 30px; height: 30px;
    background: linear-gradient(135deg, #002e48 0%, #0a4a6e 45%, #255a85 100%);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
    flex-shrink: 0;
    padding: 3px;
}

.navbar-logo svg {
    transform-origin: center;
    transform-box: fill-box;
    transform: scale(-1, -1);
}

.navbar-title-group {
    display: flex; flex-direction: column;
}

.navbar-title {
    color: var(--text-primary); font-size: 0.95rem; font-weight: 600; letter-spacing: 0.2px;
    line-height: 1.25;
    transition: color var(--t-slow) ease;
}

.navbar-subtitle {
    color: var(--text-muted); font-size: 0.58rem;
    letter-spacing: 2px; text-transform: uppercase; font-weight: 600;
    transition: color var(--t-slow) ease;
}

.navbar-actions {
    display: flex; align-items: center; gap: 4px;
}

.nav-btn {
    background: transparent;
    border: none;
    color: #8a9ca6;
    font-size: 0.82rem; font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--r-sm);
    cursor: pointer;
    display: flex; align-items: center; gap: 6px;
    transition: background var(--t-fast), color var(--t-fast);
    white-space: nowrap;
}

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

.nav-btn-icon {
    padding: 6px 10px;
    font-size: 1rem;
}

.nav-divider {
    width: 1px; height: 24px;
    background: rgba(255,255,255,0.12);
    margin: 0 8px;
}

.nav-btn[data-tooltip] {
    position: relative;
}

.nav-btn[data-tooltip]::before,
.nav-btn[data-tooltip]::after {
    position: absolute;
    right: 0;
    left: auto;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-fast) ease, transform var(--t-fast) ease;
    z-index: 200;
}

.nav-btn[data-tooltip]::before {
    content: attr(data-tooltip);
    top: calc(100% + 10px);
    transform: translateY(-3px);
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    border-radius: var(--r-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.76rem;
    font-weight: 500;
    line-height: 1.2;
    padding: 6px 8px;
    white-space: nowrap;
}

.nav-btn[data-tooltip]::after {
    content: '';
    top: calc(100% + 4px);
    right: 12px;
    transform: translateY(-3px);
    width: 0;
    height: 0;
    border: 6px solid transparent;
    border-bottom-color: var(--card-bg);
}

.nav-btn[data-tooltip]:hover::before,
.nav-btn[data-tooltip]:hover::after,
.nav-btn[data-tooltip]:focus-visible::before,
.nav-btn[data-tooltip]:focus-visible::after {
    opacity: 1;
}

.nav-btn[data-tooltip]:hover::before,
.nav-btn[data-tooltip]:focus-visible::before {
    transform: translateY(0);
}

.nav-btn[data-tooltip]:hover::after,
.nav-btn[data-tooltip]:focus-visible::after {
    transform: translateY(0);
}

.grid-toggle {
    position: relative;
}

.grid-slash {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 18px;
    background: currentColor;
    border-radius: 2px;
    transform: translate(-50%, -50%) rotate(-35deg);
    opacity: 0;
    transition: opacity var(--t-fast) ease;
    pointer-events: none;
}

.grid-toggle.grid-off .grid-slash {
    opacity: 1;
}

/* ---------- Main Content Layout ----------------------------- */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
    height: calc(100vh - var(--navbar-height));
}

/* ---------- Left Sidebar Navigation (WinUI 3 style) --------- */
.sidebar-nav {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 300;
    background:
        linear-gradient(180deg, rgba(var(--medium-rgb), 0.08) 0%, rgba(var(--medium-rgb), 0.03) 100%),
        var(--card-bg);
    border-right: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transform: translateX(0);
    transition: transform var(--t-med) ease, border-color var(--t-slow);
}

.sidebar-nav.collapsed {
    transform: translateX(-100%);
    box-shadow: none;
    border-right: none;
}

.sidebar-nav-inner {
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: var(--sidebar-width);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 14px;
    border: none;
    border-radius: var(--r-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--t-fast), color var(--t-fast);
    text-align: left;
    white-space: nowrap;
    position: relative;
}

.sidebar-nav-item i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.sidebar-nav-item:hover {
    background: rgba(var(--medium-rgb), 0.08);
    color: var(--text-primary);
}

.sidebar-nav-item.is-active {
    background: rgba(var(--medium-rgb), 0.12);
    color: var(--accent);
    font-weight: 600;
}

/* WinUI 3 active indicator pill */
.sidebar-nav-item.is-active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 18px;
    border-radius: 2px;
    background: var(--accent);
    transition: height var(--t-fast);
}

[data-theme="dark"] .sidebar-nav-item:hover {
    background: rgba(255,255,255,0.06);
}

[data-theme="dark"] .sidebar-nav-item.is-active {
    background: rgba(255,255,255,0.08);
}

/* Scrollbar */
.sidebar-nav::-webkit-scrollbar {
    width: 5px;
}
.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(0,0,0,0.15);
    border-radius: 3px;
}
[data-theme="dark"] .sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.12);
}

/* ---------- View Panels ------------------------------------- */
.view-panel {
    flex: 1;
    display: none;
    overflow: hidden;
    position: relative;
    background: var(--body-bg);
    transition: background var(--t-slow);
}

.view-panel.is-active {
    display: flex;
    align-items: stretch;
    justify-content: stretch;
}

#viewer-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Placeholder content for Test1 / Test2 */
.view-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 500;
}

.view-placeholder i {
    font-size: 2.5rem;
    opacity: 0.4;
}

/* Loading spinner */
.viewer-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 10;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--body-bg);
}

.viewer-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--card-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: viewer-spin 0.8s linear infinite;
}

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

/* Error state */
.viewer-error {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 10;
    color: var(--danger, #d73a49);
    font-size: 0.9rem;
    background: var(--body-bg);
}

.viewer-error i {
    font-size: 2rem;
    opacity: 0.7;
}

.viewer-hidden {
    display: none !important;
}

/* Drag-and-drop overlay */
.viewer-dropzone {
    position: absolute;
    inset: 0;
    z-index: 15;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(2, 117, 216, 0.12);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 3px dashed var(--accent);
    border-radius: var(--r-md);
    margin: 12px;
    transition: opacity var(--t-fast) ease;
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 600;
    pointer-events: none;
}

.dropzone-content i {
    font-size: 2.5rem;
    opacity: 0.8;
}

/* Active file name pill in navbar */
.navbar-filename {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: var(--r-xl);
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.3px;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: background var(--t-fast), color var(--t-fast);
}

.navbar-filename i {
    font-size: 0.65rem;
    opacity: 0.6;
}

/* ---------- Responsive -------------------------------------- */
@media (max-width: 680px) {
    .navbar-subtitle { display: none; }
}

/* ============================================================
   3D Viewer Bottom Controls Bar + Floating Gizmo
   ============================================================ */

/* Viewer host needs column layout for bottom bar */
#viewer-host.is-active {
    display: flex;
    flex-direction: column;
}

#viewer-host canvas#viewer-canvas {
    flex: 1;
    min-height: 0;
}

/* Floating 3D Toolbar */
.viewer-toolbar {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 18;
    pointer-events: none;
    display: flex;
    align-items: flex-start;
}

.vt-toggle {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    color: #ccd6e0;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--t-fast);
    z-index: 20;
    pointer-events: auto;
    flex-shrink: 0;
}

.vt-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
}

.vt-toggle i {
    transition: transform var(--t-med) ease;
}

/* When collapsed, rotate chevron */
.vt-body.collapsed .vt-toggle i {
    transform: rotate(180deg);
}

/* Collapsible content wrapper */
.vt-collapsible {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    overflow: hidden;
    transition: max-height var(--t-med) ease, opacity var(--t-med) ease;
    max-height: 600px;
    opacity: 1;
}

.vt-body.collapsed .vt-collapsible {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.vt-body {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px;
    background: var(--toolbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--toolbar-border);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    overflow: visible;
    pointer-events: auto;
}

/* When collapsed, just hide the collapsible content (toggle stays visible) */

/* When toolbar has been dragged (position:fixed via JS), round all corners */
.vt-body[style*="position: fixed"] {
    border-radius: 14px;
}

/* Snap overrides – flat side flush with page edge, round side faces inward */
.vt-body.pp-snapped-right[style*="position: fixed"] {
    border-radius: 14px 0 0 14px;
}
.vt-body.pp-snapped-left[style*="position: fixed"] {
    border-radius: 0 14px 14px 0;
}

/* Dark theme adjustments */
[data-theme="dark"] .vt-body {
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .vt-toggle {
    background: rgba(20, 26, 36, 0.88);
}

/* Axis gizmo */
.vt-gizmo {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0;
}

.vt-gizmo.pp-gizmo-sm {
    width: 28px;
    height: 28px;
}

#gizmo-canvas {
    width: 44px;
    height: 44px;
    border-radius: 6px;
}

#pp-gizmo-canvas {
    width: 28px;
    height: 28px;
    border-radius: 4px;
}

/* Separator */
.vt-separator {
    width: 28px;
    height: 1px;
    background: var(--toolbar-border);
    margin: 3px 0;
}

/* ── Transform Flyout Panel ──────────────────────────────── */
.tf-flyout {
    position: fixed;
    width: 200px;
    background: rgba(34, 40, 52, 0.94);
    border-radius: 14px;
    padding: 12px 14px 14px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.06) inset;
    z-index: 60;
    display: none;
    flex-direction: column;
    gap: 8px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.tf-flyout.is-open {
    display: flex;
    animation: tf-slide-in 180ms ease-out;
}

@keyframes tf-slide-in {
    from { opacity: 0; transform: translateX(10px); }
    to   { opacity: 1; transform: translateX(0); }
}

.tf-header {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(180, 190, 205, 0.7);
    display: flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 4px;
}

.tf-header i {
    font-size: 0.68rem;
    color: rgba(77, 166, 255, 0.7);
}

.tf-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tf-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: rgba(156, 168, 184, 0.55);
    user-select: none;
}

.tf-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
}

.tf-grid {
    display: grid;
    gap: 5px;
}

.tf-grid-2 { grid-template-columns: 1fr 1fr; }
.tf-grid-3 { grid-template-columns: 1fr 1fr 1fr; }

.tf-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    height: 34px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    color: #b8c4d2;
    font-size: 0.78rem;
    font-family: inherit;
    cursor: pointer;
    transition: background 120ms ease, color 120ms ease, transform 80ms ease;
}

.tf-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #e0e8f0;
    transform: scale(1.04);
}

.tf-btn:active {
    transform: scale(0.96);
    background: rgba(2, 117, 216, 0.25);
}

.tf-btn i {
    font-size: 0.65rem;
    opacity: 0.7;
}

.tf-axis {
    font-weight: 700;
    font-size: 0.8rem;
}
.tf-axis.x { color: #e74c6f; }
.tf-axis.y { color: #8bc34a; }
.tf-axis.z { color: #4a90d9; }

.tf-sign {
    font-size: 0.7rem;
    font-weight: 500;
    color: #9ca8b8;
}

/* Light mode */
:root .tf-flyout {
    background: rgba(245, 248, 252, 0.96);
    box-shadow: 0 8px 32px rgba(0,0,0,0.12), 0 0 0 1px rgba(0,0,0,0.06);
}
:root .tf-header { color: rgba(60, 70, 85, 0.7); }
:root .tf-label  { color: rgba(90, 100, 115, 0.6); }
:root .tf-divider { background: rgba(0, 0, 0, 0.07); }
:root .tf-btn { background: rgba(0, 0, 0, 0.05); color: #4a5568; }
:root .tf-btn:hover { background: rgba(0, 0, 0, 0.1); color: #1a2b3c; }
:root .tf-btn:active { background: rgba(2, 117, 216, 0.15); }
:root .tf-sign { color: #5c7080; }

/* Dark mode overrides already covered by default (dark bg) */
[data-theme="dark"] .tf-flyout {
    background: rgba(20, 26, 36, 0.94);
    box-shadow: 0 8px 32px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}

/* Grab handle for repositioning toolbar */
.vt-grab-handle {
    width: 40px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(156, 168, 184, 0.5);
    font-size: 0.85rem;
    cursor: grab;
    border-radius: 8px;
    transition: color var(--t-fast), background var(--t-fast);
    user-select: none;
}

.vt-grab-handle:hover {
    color: #e0e8f0;
    background: rgba(255, 255, 255, 0.08);
}

.vt-grab-handle:active {
    cursor: grabbing;
    color: #4da6ff;
}

/* Toolbar buttons */
.vt-btn {
    width: 40px;
    height: 36px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--t-fast), color var(--t-fast);
    position: relative;
}

.vt-btn:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-primary);
}

[data-theme="dark"] .vt-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.vt-btn:active {
    background: rgba(0, 0, 0, 0.10);
}

[data-theme="dark"] .vt-btn:active {
    background: rgba(255, 255, 255, 0.12);
}

.vt-btn.is-active {
    background: rgba(2, 117, 216, 0.18);
    color: var(--accent);
}

/* Round variant (zoom/pan) */
.vt-btn-round {
    border-radius: 50%;
    width: 38px;
    height: 38px;
    font-size: 0.9rem;
}

/* Tooltip for toolbar buttons — positioned to the LEFT of the panel */
.vt-btn[title] {
    position: relative;
}

.vt-btn::before {
    content: attr(title);
    position: absolute;
    right: calc(100% + 14px);
    top: 50%;
    transform: translateY(-50%) translateX(4px);
    background: rgba(30, 34, 42, 0.95);
    color: #dde4ec;
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 150ms ease, transform 150ms ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    z-index: 100;
}

.vt-btn:hover::before {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* Bottom controls bar */
.viewer-controls-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background:
        linear-gradient(180deg, rgba(var(--medium-rgb), 0.06) 0%, rgba(var(--medium-rgb), 0.02) 100%),
        var(--card-bg);
    border-top: 1px solid var(--card-border);
    flex-shrink: 0;
    flex-wrap: wrap;
    min-height: 48px;
    z-index: 18;
}

/* Active-state highlight for viewer bottom bar buttons */
.viewer-controls-bar .cv-ctrl-btn.is-active {
    background: rgba(2, 117, 216, 0.18);
    border-color: var(--accent);
    color: var(--accent);
}

/* Stacked file path + camera info */
.viewer-info-stack {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

/* Loaded file path display */
.viewer-file-path {
    font-size: 0.66rem;
    font-family: 'Menlo', 'Consolas', monospace;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: default;
    line-height: 1.3;
}

/* Camera info display */
.viewer-cam-display {
    font-size: 0.72rem;
    font-family: 'Menlo', 'Consolas', monospace;
    color: var(--text-muted);
    padding: 4px 8px;
    background: rgba(0,0,0,0.04);
    border-radius: var(--r-xs);
    white-space: nowrap;
}
[data-theme="dark"] .viewer-cam-display {
    background: rgba(255,255,255,0.04);
}

/* Screenshot dropdown group */
.screenshot-group {
    position: relative;
}

.screenshot-dropdown {
    display: none;
    position: absolute;
    bottom: calc(100% + 6px);
    right: 0;
    min-width: 160px;
    background: rgba(40, 44, 52, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 8px;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.06) inset;
    padding: 4px 0;
    z-index: 100;
}

.screenshot-dropdown.is-open {
    display: flex;
    flex-direction: column;
}

.screenshot-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: none;
    background: transparent;
    color: #ccd6e0;
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 120ms ease;
    white-space: nowrap;
}

.screenshot-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.screenshot-option:active {
    background: rgba(2, 117, 216, 0.25);
}

.screenshot-option i {
    width: 16px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--accent);
}

[data-theme="dark"] .screenshot-dropdown {
    background: rgba(20, 26, 36, 0.95);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}

/* Export dropdown group (mirrors screenshot dropdown) */
.export-group {
    position: relative;
    margin-left: 6px;
}

.export-dropdown {
    display: none;
    position: absolute;
    bottom: calc(100% + 6px);
    right: 0;
    min-width: 170px;
    background: rgba(40, 44, 52, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 8px;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.06) inset;
    padding: 4px 0;
    z-index: 100;
}

.export-dropdown.is-open {
    display: flex;
    flex-direction: column;
}

.export-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: none;
    background: transparent;
    color: #ccd6e0;
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 120ms ease;
    white-space: nowrap;
}

.export-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.export-option:active {
    background: rgba(2, 117, 216, 0.25);
}

.export-option i {
    width: 16px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--accent);
}

[data-theme="dark"] .export-dropdown {
    background: rgba(20, 26, 36, 0.95);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}

/* -- Shared Control Buttons --------------------------------------- */
.cv-ctrl-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    border: 1px solid var(--card-border);
    border-radius: var(--r-sm);
    background: var(--card-bg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast), transform 80ms;
    white-space: nowrap;
}

.cv-ctrl-btn:hover {
    background: rgba(var(--medium-rgb), 0.08);
    border-color: var(--medium);
}

.cv-ctrl-btn:active {
    transform: scale(0.96);
}

.cv-ctrl-btn:disabled {
    opacity: 0.4;
    pointer-events: none;
}

.cv-ctrl-btn i {
    font-size: 0.85rem;
    opacity: 0.7;
}

.cv-ctrl-btn-muted {
    color: var(--text-secondary);
}

.cv-ctrl-btn-accent {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.cv-ctrl-btn-accent:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.cv-ctrl-divider {
    width: 1px;
    height: 24px;
    background: var(--card-border);
    margin: 0 4px;
}

.cv-rot-group {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.cv-rot-label {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: 2px;
    white-space: nowrap;
}

.cv-rot-btn {
    padding: 4px 8px;
    border: 1px solid var(--card-border);
    border-radius: var(--r-xs);
    background: var(--card-bg);
    color: var(--text-primary);
    font-family: 'Menlo', 'Consolas', monospace;
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast), transform 80ms;
    white-space: nowrap;
}

.cv-rot-btn:hover {
    background: rgba(var(--medium-rgb), 0.1);
    border-color: var(--medium);
}

.cv-rot-btn:active {
    transform: scale(0.93);
}

.cv-rotation-display {
    font-size: 0.72rem;
    font-family: 'Menlo', 'Consolas', monospace;
    color: var(--text-muted);
    padding: 4px 8px;
    background: rgba(0,0,0,0.04);
    border-radius: var(--r-xs);
    white-space: nowrap;
}

[data-theme="dark"] .cv-rotation-display {
    background: rgba(255,255,255,0.04);
}

.cv-ctrl-spacer {
    flex: 1;
}

.ss-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.55);
    z-index: 10001;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: ss-fade-in 0.2s ease;
}
.ss-overlay.is-open {
    display: flex;
}
@keyframes ss-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.ss-modal {
    background: var(--card-bg);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-xl);
    width: 560px;
    max-width: 92vw;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: about-slide-up 0.25s ease;
}

.ss-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--dark1), var(--dark2));
    color: #fff;
}

.ss-title {
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ss-close-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    font-size: 1.4rem;
    cursor: pointer;
    line-height: 1;
    padding: 0 4px;
    transition: color var(--t-fast);
}
.ss-close-btn:hover {
    color: #fff;
}

.ss-body {
    padding: 16px 20px;
    overflow-y: auto;
    flex: 1;
}

.ss-preview-wrap {
    background: repeating-conic-gradient(#d0d0d0 0% 25%, #fff 0% 50%) 50%/16px 16px;
    border-radius: var(--r-sm);
    border: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    max-height: 50vh;
    overflow: hidden;
    margin-bottom: 14px;
}
[data-theme="dark"] .ss-preview-wrap {
    background: repeating-conic-gradient(#2a3a4a 0% 25%, #1b2838 0% 50%) 50%/16px 16px;
}

.ss-preview-img {
    max-width: 100%;
    max-height: 50vh;
    object-fit: contain;
    display: block;
}

.ss-options {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.ss-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    color: var(--text-primary);
}
.ss-toggle input { display: none; }

.ss-toggle-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--text-muted);
    border-radius: 10px;
    transition: background var(--t-fast);
    flex-shrink: 0;
}
.ss-toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px; left: 2px;
    width: 16px; height: 16px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--t-fast);
}
.ss-toggle input:checked + .ss-toggle-slider {
    background: var(--accent);
}
.ss-toggle input:checked + .ss-toggle-slider::after {
    transform: translateX(16px);
}

.ss-toggle-label {
    font-weight: 500;
}

.ss-footer {
    display: flex;
    gap: 8px;
    padding: 12px 20px 16px;
    border-top: 1px solid var(--card-border);
    justify-content: flex-end;
    flex-wrap: wrap;
}

.ss-save-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 18px;
    border-radius: var(--r-sm);
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background var(--t-fast);
}
.ss-save-btn:hover {
    background: var(--accent-hover);
}

/* ---------- About Modal ------------------------------------- */
.about-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: about-fade-in 0.2s ease;
}
.about-overlay.is-open {
    display: flex;
}

@keyframes about-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.about-modal {
    background: var(--card-bg);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-xl);
    width: 420px;
    max-width: 90vw;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: about-slide-up 0.25s ease;
}

@keyframes about-slide-up {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.about-header {
    text-align: center;
    padding: 28px 24px 16px;
    background: linear-gradient(135deg, var(--dark1), var(--dark2));
    color: #fff;
}

.about-logo {
    width: 64px;
    height: 64px;
    margin-bottom: 12px;
    transform: scaleY(-1) rotate(0deg);
    transition: transform 0.45s cubic-bezier(.4,2,.6,1);
    cursor: pointer;
    user-select: none;
}

.about-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    margin-bottom: 4px;
}

.about-subtitle {
    font-size: 0.72rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
}

.about-body {
    padding: 20px 24px;
    overflow-y: auto;
    flex: 1;
}

.about-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 0.88rem;
}

.about-label {
    color: var(--text-muted);
    font-weight: 500;
}

.about-value {
    color: var(--text-primary);
    font-weight: 600;
}

.about-divider {
    height: 1px;
    background: var(--card-border);
    margin: 14px 0;
}

.about-section-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.about-licenses {
    overflow-x: auto;
}

.about-license-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
}

.about-license-table thead th {
    text-align: left;
    padding: 6px 8px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--card-border);
    white-space: nowrap;
}

.about-license-table tbody td {
    padding: 5px 8px;
    border-bottom: 1px solid var(--card-border);
    color: var(--text-primary);
    vertical-align: top;
}

.about-license-table tbody tr:last-child td {
    border-bottom: none;
}

.about-license-table tbody tr:hover {
    background: rgba(2,117,216,0.04);
}

[data-theme="dark"] .about-license-table tbody tr:hover {
    background: rgba(2,117,216,0.08);
}

.about-footer {
    padding: 12px 24px 16px;
    text-align: center;
    border-top: 1px solid var(--card-border);
}

.about-close-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 32px;
    border-radius: var(--r-sm);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t-fast);
}

.about-close-btn:hover {
    background: var(--accent-hover);
}

/* ---------- Settings Modal ---------------------------------- */
.settings-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: about-fade-in 0.2s ease;
}
.settings-overlay.is-open {
    display: flex;
}

.settings-modal {
    background: var(--card-bg);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-xl);
    width: 460px;
    max-width: 92vw;
    max-height: 88vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: about-slide-up 0.25s ease;
}

.settings-header {
    text-align: center;
    padding: 22px 24px 14px;
    background: linear-gradient(135deg, var(--dark1), var(--dark2));
    color: #fff;
}

.settings-header-icon {
    font-size: 2rem;
    margin-bottom: 8px;
    display: block;
    opacity: 0.9;
}

.settings-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    margin-bottom: 3px;
}

.settings-subtitle {
    font-size: 0.72rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
}

.settings-body {
    padding: 18px 22px;
    overflow-y: auto;
    flex: 1;
}

.settings-section-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.settings-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    line-height: 1.45;
}

.settings-divider {
    height: 1px;
    background: var(--card-border);
    margin: 16px 0;
}

/* Toggle rows */
.settings-toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--card-border);
}
.settings-toggle-row:last-of-type {
    border-bottom: none;
}

.settings-toggle-label {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

/* CSS toggle switch */
.settings-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
    cursor: pointer;
}
.settings-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}
.settings-switch-slider {
    position: absolute;
    inset: 0;
    background: var(--text-muted);
    border-radius: 22px;
    transition: background var(--t-fast);
}
.settings-switch-slider::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    left: 3px;
    top: 3px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--t-fast);
    box-shadow: 0 1px 3px rgba(0,0,0,0.25);
}
.settings-switch input:checked + .settings-switch-slider {
    background: var(--accent);
}
.settings-switch input:checked + .settings-switch-slider::before {
    transform: translateX(18px);
}
.settings-switch input:focus-visible + .settings-switch-slider {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Relocate panel (hidden until toggle is on) */
.settings-relocate-panel {
    display: none;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
    padding: 12px 14px;
    background: rgba(2,117,216,0.06);
    border: 1px solid rgba(2,117,216,0.18);
    border-radius: var(--r-md);
}
.settings-relocate-panel.is-open {
    display: flex;
}
[data-theme="dark"] .settings-relocate-panel {
    background: rgba(2,117,216,0.08);
    border-color: rgba(2,117,216,0.22);
}

.settings-xyz-row {
    display: flex;
    align-items: center;
    gap: 5px;
}

.settings-xyz-axis {
    font-weight: 700;
    width: 14px;
    text-align: center;
    font-size: 12px;
    flex-shrink: 0;
}
.settings-xyz-axis.x { color: #e05555; }
.settings-xyz-axis.y { color: #55bb55; }
.settings-xyz-axis.z { color: #5588e0; }

.settings-xyz-input {
    flex: 1;
    min-width: 0;
    padding: 4px 6px;
    border: 1px solid var(--card-border);
    border-radius: var(--r-xs);
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.82rem;
    text-align: center;
}
.settings-xyz-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.settings-step-btn {
    padding: 4px 7px;
    border: 1px solid var(--card-border);
    border-radius: var(--r-xs);
    background: var(--body-bg);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: background var(--t-fast), color var(--t-fast);
    flex-shrink: 0;
}
.settings-step-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.settings-relocate-actions {
    display: flex;
    gap: 6px;
    margin-top: 4px;
}

.settings-action-btn {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--card-border);
    border-radius: var(--r-sm);
    background: var(--body-bg);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: background var(--t-fast), color var(--t-fast);
}
.settings-action-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.settings-footer {
    padding: 12px 22px 16px;
    text-align: center;
    border-top: 1px solid var(--card-border);
}

.settings-close-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 36px;
    border-radius: var(--r-sm);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t-fast);
}
.settings-close-btn:hover {
    background: var(--accent-hover);
}

/* ---------- Debug Panel ------------------------------------- */
.debug-panel {
    display: none;
    position: absolute;
    bottom: 52px;
    right: 12px;
    z-index: 100;
    background: rgba(0, 0, 0, 0.88);
    color: #0f0;
    font: 11px/1.5 'Menlo', 'Consolas', monospace;
    padding: 0;
    border-radius: var(--r-sm);
    max-width: 420px;
    min-width: 240px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
    overflow: hidden;
    pointer-events: auto;
}

.debug-panel.is-visible {
    display: block;
}

.debug-panel-header {
    padding: 6px 12px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #0f0;
    background: rgba(0, 255, 0, 0.08);
    border-bottom: 1px solid rgba(0, 255, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 6px;
}

.debug-panel-content {
    padding: 8px 12px;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
    font-size: 11px;
    line-height: 1.5;
}

.debug-panel-content::-webkit-scrollbar {
    width: 6px;
}
.debug-panel-content::-webkit-scrollbar-track {
    background: transparent;
}
.debug-panel-content::-webkit-scrollbar-thumb {
    background: rgba(0, 255, 0, 0.2);
    border-radius: 3px;
}

/* ============================================================
   Projection / Appearance Flyout Panels (WinUI3 style)
   ============================================================ */
.vt-flyout {
    position: fixed;
    z-index: 60;
    min-width: 190px;
    display: none;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px 16px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.vt-flyout.is-open {
    display: flex;
    animation: tf-slide-in 160ms ease-out;
}

.vt-flyout-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.vt-flyout-label {
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.vt-flyout-note {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.45;
    margin: 2px 0 0;
}

.vt-radio {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.86rem;
    color: var(--text-primary);
    user-select: none;
}

.vt-radio input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.vt-radio-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    flex-shrink: 0;
    position: relative;
    transition: border-color var(--t-fast);
}

.vt-radio input:checked + .vt-radio-dot {
    border-color: var(--accent);
}

.vt-radio input:checked + .vt-radio-dot::after {
    content: '';
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--accent);
}

.vt-radio:hover .vt-radio-dot {
    border-color: var(--accent);
}

.vt-radio input:focus-visible + .vt-radio-dot {
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Object-shading swatches */
.shade-swatch-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    width: 184px;
}

.shade-swatch {
    height: 30px;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    transition: transform var(--t-fast), box-shadow var(--t-fast);
}

.shade-swatch:hover {
    transform: scale(1.08);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.shade-custom-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 10px 0 8px;
}

.shade-custom-label,
.shade-opacity-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    min-width: 48px;
}

.shade-color-input {
    width: 34px;
    height: 28px;
    padding: 0;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    background: transparent;
    cursor: pointer;
}

.shade-color-input::-webkit-color-swatch-wrapper { padding: 2px; }
.shade-color-input::-webkit-color-swatch { border: none; border-radius: 4px; }

.shade-hex-input {
    flex: 1 1 auto;
    min-width: 0;
    height: 28px;
    padding: 0 8px;
    font-size: 0.8rem;
    font-family: var(--font-mono, monospace);
    text-transform: uppercase;
    color: var(--text-primary);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 6px;
}

.shade-hex-input:focus {
    outline: none;
    border-color: var(--accent);
}

.shade-apply {
    appearance: none;
    height: 28px;
    padding: 0 10px;
    font-size: 0.78rem;
    color: var(--text-primary);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color var(--t-fast);
}

.shade-apply:hover { border-color: var(--accent); }

.shade-opacity-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.shade-opacity {
    flex: 1 1 auto;
    min-width: 0;
    accent-color: var(--accent);
    cursor: pointer;
}

.shade-opacity-value {
    font-size: 0.78rem;
    color: var(--text-secondary);
    min-width: 38px;
    text-align: right;
}

.vt-flyout-reset {
    appearance: none;
    width: 100%;
    padding: 8px 10px;
    font-size: 0.8rem;
    color: var(--text-primary);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color var(--t-fast), background var(--t-fast);
}

.vt-flyout-reset:hover:not(:disabled) {
    border-color: var(--accent);
}

.vt-flyout-reset:disabled {
    opacity: 0.45;
    cursor: default;
}

/* ============================================================
   Help & Shortcuts Dialog (WinUI3 HelpDialog style)
   ============================================================ */
.help-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: about-fade-in 0.2s ease;
}

.help-overlay.is-open {
    display: flex;
}

.help-modal {
    background: var(--card-bg);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-xl);
    width: 600px;
    max-width: 92vw;
    max-height: 88vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: about-slide-up 0.25s ease;
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 22px;
    background: linear-gradient(135deg, var(--dark1), var(--dark2));
    color: #fff;
}

.help-title {
    font-size: 1.05rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.help-close-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 4px;
    transition: color var(--t-fast);
}

.help-close-btn:hover {
    color: #fff;
}

.help-body {
    padding: 18px 22px;
    overflow-y: auto;
    flex: 1;
}

.help-section-title {
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 12px;
}

.help-section-title:not(:first-child) {
    margin-top: 24px;
}

.help-kv-grid,
.help-fmt-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 9px 16px;
    align-items: center;
}

.help-key,
.help-fmt {
    font-family: 'Menlo', 'Consolas', monospace;
    font-size: 0.76rem;
    background: rgba(0,0,0,0.05);
    border: 1px solid var(--card-border);
    border-radius: 5px;
    padding: 4px 9px;
    color: var(--text-primary);
    white-space: nowrap;
    justify-self: start;
}

.help-fmt {
    color: var(--accent);
    font-weight: 600;
}

[data-theme="dark"] .help-key,
[data-theme="dark"] .help-fmt {
    background: rgba(255,255,255,0.05);
}

.help-kv-grid span,
.help-fmt-grid span {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.35;
}

.help-footer {
    display: flex;
    justify-content: flex-end;
    padding: 14px 22px 18px;
    border-top: 1px solid var(--card-border);
}