/* Screen-reader-only: present in the DOM (and for crawlers) but visually
   hidden without removing it from the accessibility tree. */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

:root {
    /* Needle brand surfaces */
    --color-page: #F0F4EF;          /* light green page stage */
    --color-surface: #FFFFFF;       /* white working surfaces */
    --color-info: #DBEBE1;          /* callout success */

    /* Needle brand greens */
    --color-green: #99CC33;
    --color-green-dark: #74AF52;
    --color-green-light: #D7DB0A;
    --needle-brand-gradient: linear-gradient(135deg, #D7DB0A 0%, #99CC33 46%, #62D399 100%);
    --needle-brand-gradient-shadow: 0 6px 16px rgba(116, 175, 82, 0.26);

    /* USD brand blue (matches usd-logo.png) */
    --color-usd-blue: #2C8FD0;
    --color-usd-blue-dark: #1F7BB5;

    /* Text */
    --color-text: #1A1A1A;
    --color-text-secondary: #4A4E4A;
    --color-text-muted: #767A76;
    --color-link: #826AED;

    /* Borders */
    --border-subtle: #D9E2D7;
    --border-strong: #C6D0C4;
    --border-focus: #826AED;

    /* Backwards-compatible aliases used across the stylesheet */
    --color-bg-0: var(--color-surface);
    --color-bg-1: var(--color-page);
    --color-bg-2: var(--color-info);
    --color-theme-1: var(--color-text);
    --color-theme-2: var(--color-green-dark);

    --font-body: "Nunito Sans", system-ui, -apple-system, sans-serif;
    --font-code: "Monaspace Neon", ui-monospace, "SF Mono", Menlo, monospace;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    color: var(--color-text);
    min-height: 100vh;
    background-attachment: fixed;
    /* Solid light-green stage — brand: no decorative gradients */
    background-color: var(--color-page);
}

.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    /* Dark terminal bar — solid, no blur / glass */
    background-color: #222125;
    border-top: 1px solid #40393B;
    padding: 8px 15px;
    z-index: 100;
}

.footer-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

#message-log {
    opacity: 1;
    font-size: 0.75em;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    font-family: var(--font-code);
    max-height: 40vh;
    overflow-y: auto;
    line-height: 1.4;
    flex: 1;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.clear-log-button {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-body);
    font-size: 0.75em;
    font-weight: 600;
    height: 24px;
    padding: 0 10px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s, border-color 0.15s, opacity 0.15s;
    flex-shrink: 0;
}

.clear-log-button:hover {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
}

.clear-log-button:disabled {
    opacity: 0.4;
    cursor: default;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.85);
}

/* Loading spinner (footer terminal bar) */
.spinner {
    width: 13px;
    height: 13px;
    flex-shrink: 0;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-top-color: var(--color-green);
    border-radius: 50%;
    animation: spinner-rotate 0.7s linear infinite;
}

.spinner[hidden] {
    display: none;
}

/* Inline status icon inside the footer log (e.g. the "loading done" check) */
.log-icon {
    width: 13px;
    height: 13px;
    vertical-align: -2px;
    margin-right: 6px;
    color: var(--color-green);
}

/* Centered drop hint — visible while no model is loaded */
#dropzone {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    /* let drags/clicks fall through to the 3D canvas underneath */
    pointer-events: none;
    /* sits above the canvas but below the toolbar + its menu popover */
    z-index: 10;
    padding: 24px;
}

/* Hidden once a model is loaded (#container gains .have-custom-file). #container
   is now nested in #top-center, so #dropzone is no longer its sibling — match
   via :has() on the wrapper instead. */
#top-center:has(.have-custom-file) ~ #dropzone {
    display: none;
}

.dropzone-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 36px 52px;
    border: 2px dashed var(--border-strong);
    border-radius: 20px;
    background-color: rgba(255, 255, 255, 0.55);
    color: var(--color-text-muted);
    text-align: center;
    transition: border-color 0.15s, background-color 0.15s, color 0.15s;
}

.dropzone-icon {
    width: 52px;
    height: 52px;
    color: var(--color-text-muted);
}

.dropzone-title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-secondary);
}

.dropzone-subtitle {
    margin: 0;
    font-size: 0.85rem;
}

/* highlight while a file is dragged anywhere over the window */
body.drag-active .dropzone-inner {
    border-color: var(--color-green);
    background-color: var(--color-info);
    color: var(--color-green-dark);
}

body.drag-active .dropzone-title {
    color: var(--color-green-dark);
}

/* Centered loading overlay — one row: spinner, label, filename, sep, cancel */
#loading-overlay {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    /* above the drop hint, still below the toolbar + its menu popover */
    z-index: 20;
    padding: 24px;
    /* backdrop is click-through; only the pill captures clicks */
    pointer-events: none;
}

#loading-overlay.visible {
    display: flex;
}

.loading-overlay-inner {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: min(90vw, 560px);
    padding: 12px 12px 12px 18px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background-color: var(--color-surface);
    box-shadow: 0 8px 28px rgba(26, 26, 26, 0.18);
    pointer-events: auto;
}

.spinner-md {
    width: 20px;
    height: 20px;
    margin-top: 0;
    border: 2.5px solid var(--border-subtle);
    border-top-color: var(--color-green);
    flex-shrink: 0;
}

.loading-overlay-word {
    color: var(--color-text-secondary);
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
}

.loading-overlay-filename {
    color: var(--color-text);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 320px;
    min-width: 0;
}

.loading-overlay-progress {
    color: var(--color-green-dark);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 4ch;
    text-align: right;
}

.loading-overlay-progress[hidden] {
    display: none;
}

.loading-overlay-sep {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.loading-cancel-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    flex-shrink: 0;
    border: 1px solid var(--border-strong);
    border-radius: 50%;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.loading-cancel-button:hover {
    background-color: var(--color-info);
    color: var(--color-text);
}

.loading-cancel-button svg {
    width: 15px;
    height: 15px;
}

/* Centered load-error card — same centered placement as the loading overlay,
   shown when a file fails to load (e.g. 404). */
#load-error {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    /* above the drop hint (10) and loading overlay (20), below the toolbar (200) */
    z-index: 25;
    padding: 24px;
    pointer-events: none; /* backdrop is click-through; only the card captures */
}

#load-error.visible {
    display: flex;
}

.load-error-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: min(92vw, 540px);
    padding: 13px 13px 13px 17px;
    border: 1px solid rgba(179, 38, 30, 0.28);
    border-radius: 14px;
    background: var(--color-surface);
    box-shadow: 0 8px 28px rgba(26, 26, 26, 0.18);
    pointer-events: auto;
}

.load-error-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    color: #b3261e;
}

.load-error-title {
    margin: 0;
    min-width: 0;
    color: var(--color-text);
    font-weight: 700;
    font-size: 0.92rem;
    line-height: 1.35;
}

.load-error-dismiss {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    flex-shrink: 0;
    border: 1px solid var(--border-strong);
    border-radius: 50%;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s, transform 0.12s cubic-bezier(0.23, 1, 0.32, 1);
}

.load-error-dismiss:hover {
    background-color: var(--color-info);
    color: var(--color-text);
}

.load-error-dismiss:active {
    transform: scale(0.94);
}

.load-error-dismiss svg {
    width: 15px;
    height: 15px;
}

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

#container {
    background-color: var(--color-surface);
    font-size: 0.9em;
    min-height: 44px;
    display: flex;
    align-items: center;

    padding-left: 16px;
    padding-right: 16px;
    margin-top: 5px;

    border: 1px solid var(--border-subtle);
    /* Pill: fully rounded left/right ends */
    border-radius: 999px;
    box-shadow: 0 1px 4px rgba(26, 26, 26, 0.06);
    /* stacking context above the drop hint (10) and loading overlay (20) so the
       menu popover renders on top of both */
    z-index: 30;
}

#container .buttons {
    display: flex;
    align-items: center;
    /* The pill stays a single row at every width; items condense on mobile
       (see the max-width media query) rather than wrapping to a second line. */
    flex-wrap: nowrap;
    flex-direction: row;
    white-space: nowrap;
}

.needle-logo {
    height: 26px;
    /* block removes the inline baseline gap so the logo sits centered */
    display: block;
    /* brand: logo must not be recolored or faded — keep full opacity */
    opacity: 1;
}

.app-wordmark {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    margin: 0 12px 0 2px;
    color: var(--color-text-secondary);
    font-size: 18px;
    font-weight: 300;
    line-height: 1;
}

/* Dropdown Styles */
.dropdown {
    /* Static (not relative) so the menu's containing block is the centered pill
       (#container), letting it center under the pill instead of opening off the
       right edge from the off-centre Load Sample button. */
    position: static;
    display: inline-block;
}

.dropdown-button {
    background-color: transparent;
    border: none;
    color: var(--color-text-secondary);
    padding: 8px 10px;
    margin: 0 4px;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    transition: color 0.15s linear;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Inline icon inside the dropdown button */
.dropdown-button .btn-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.dropdown-button:hover {
    color: var(--color-text);
}

.debug-test-button {
    margin: 0 4px;
    padding: 8px 10px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--color-text-secondary);
    font: inherit;
    cursor: pointer;
    transition: color 0.15s linear, background 0.15s linear;
}

.debug-test-button:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.debug-test-button:disabled {
    opacity: 0.55;
    cursor: progress;
}

.viewer-mode-toggle {
    margin: 0 4px;
}
/* NOTE: the engine-switch button sizing lives AFTER ".converter-toggle button"
   (search "Engine switch") so its larger, readable font wins the cascade. */

.header-overflow {
    position: relative;
    display: none;
    align-items: center;
}

.header-overflow-button {
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.header-overflow-button:hover,
.header-overflow.menu-open .header-overflow-button {
    color: var(--color-text);
    background: var(--color-surface);
}

/* The dots icon is the button's only content, so strip the inline-icon spacing
   meant for icons that sit before text — otherwise the margin-right pushes the
   dots left of the circle's centre. */
.header-overflow-button .inline-icon {
    margin: 0;
    vertical-align: 0;
}

.header-overflow-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 188px;
    padding: 6px;
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    background: var(--color-surface);
    box-shadow: 0 12px 30px rgba(26, 26, 26, 0.16);
    display: flex;
    flex-direction: column;
    gap: 2px;
    z-index: 1001;
    /* Fade + lift in/out, matching the dialogs (see .dialog-overlay). The menu
       stays in the DOM; visibility (delayed until the fade-out finishes) removes
       it from the a11y/hit-test tree once hidden, and pointer-events guards it
       while transparent. */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px) scale(0.97);
    transform-origin: top right;
    transition: opacity 0.18s ease,
                transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0s linear 0.18s;
    pointer-events: none;
}

.header-overflow.menu-open .header-overflow-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    transition: opacity 0.18s ease,
                transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0s;
    pointer-events: auto;
}

#container .header-overflow-menu a {
    margin: 0;
    padding: 9px 10px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    /* rem, not the pill's shrinking em, so menu labels stay readable on phones —
       sized to match the dialog body text (16px) rather than the compact pill. */
    font-size: 1rem;
    & span {
        font-size: inherit;
    }
}

#container .header-overflow-menu a:hover {
    background: var(--color-page);
    text-decoration: none;
}

.header-overflow-menu .export-button::before,
.header-overflow-menu .export-button::after {
    display: none;
}

.material-wait-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    margin: 0 4px;
    padding: 2px 10px 2px 8px;
    min-height: 30px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--color-text-secondary);
    font-size: 0.82em;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.material-wait-toggle input {
    width: 14px;
    height: 14px;
    accent-color: var(--color-green);
}

.material-wait-toggle span {
    color: var(--color-text-muted);
}

.usd-viewer-three-canvas,
.usd-viewer-needle-engine {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
}

.usd-viewer-three-canvas {
    z-index: 0;
}

.usd-viewer-needle-engine {
    z-index: 0;
    display: none;
}

body.viewer-mode-needle-loader .usd-viewer-three-canvas {
    display: none !important;
}

body.viewer-mode-needle-loader .usd-viewer-needle-engine {
    display: block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--color-surface);
    width: max-content;
    max-width: min(980px, 96vw);
    /* Clear outline + lift so the popover reads as a distinct floating panel
       against the light page background. */
    box-shadow: 0 10px 28px rgba(26, 26, 26, 0.18);
    /* Above the "What's New" banner (110) and other chrome when open. */
    z-index: 200;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
    /* Gap below the pill. The JS hover model keeps the menu open for a 300ms
       grace after the cursor leaves, which covers crossing this gap — so no
       transparent-border bridge is needed and the outline can wrap all sides.
       Overridden on mobile. */
    top: calc(100% + 1em);
    /* Centered under the pill (its containing block) so a wide mega-menu stays
       within the viewport regardless of where the trigger sits in the pill. */
    left: 50%;
    transform: translateX(-50%);
    /* clip the gallery flyout's square corners to the rounded panel */
    overflow: hidden;
}

/* The menu is a two-column mega-menu: link list + Sample Library flyout.
   Visibility is JS-driven via .menu-open (see viewer-app.js): pointer devices open on
   mouseenter and close 300ms after mouseleave; touch toggles it by tap. A class
   (not :hover) is used so the close can be delayed and so a tap doesn't get
   stuck in :hover on touch. */
.dropdown.menu-open .dropdown-content {
    display: flex;
    align-items: stretch;
    /* Keep a stable minimum height so folding from a long item to a short one
       (e.g. Needle Cloud) doesn't shrink the popover out from under the cursor
       and dismiss it. The gallery grid inside scrolls within this height. */
    min-height: 50vh;
}

.dropdown-menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 12px;
    min-width: 300px;
    max-height: 72vh;
    overflow-y: auto;
    scrollbar-gutter: stable;
    flex-shrink: 0;
}

.sample-group-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sample-group-tree {
    display: flex;
    flex-direction: column;
    gap: 1px;
    margin: -1px 0 4px 0;
    padding-left: 8px;
    border-left: 1px solid var(--border-subtle);
    /* Slide open/closed. JS toggles .is-open (and [hidden] for inactive groups).
       max-height is a generous cap — tag lists never approach it. */
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.24s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.18s ease;
}

.sample-group-tree.is-open {
    max-height: 1200px;
    opacity: 1;
}

.sample-group-tree[hidden] {
    display: none;
}

@media (prefers-reduced-motion: reduce) {
    .sample-group-tree {
        transition: none;
    }
}

.sample-group-button {
    width: 100%;
    min-height: 56px;
    padding: 9px 12px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--color-text-secondary);
    text-align: left;
    font: inherit;
    cursor: pointer;
}

.sample-root-folder {
    display: grid;
    /* Label on the left, chevron on the right. */
    grid-template-columns: minmax(0, 1fr) 14px;
    column-gap: 6px;
    align-items: center;
}

/* Chevron is an inline SVG in each root-folder button; it rotates 90° when the
   folder expands — crisper and smoother than swapping ▸/▾ glyphs. */
.sample-chevron {
    grid-column: 2;
    grid-row: 1 / -1;     /* span both label lines so the chevron stays centered */
    align-self: center;
    justify-self: center;
    width: 14px;
    height: 14px;
    color: var(--color-text-muted);
    transition: transform 0.2s cubic-bezier(0.23, 1, 0.32, 1);
}

.sample-root-folder[aria-expanded="true"] .sample-chevron {
    transform: rotate(90deg);
}

/* Inline arrow SVG inside a sample-group label (e.g. "glTF → USD conversions"). */
.label-arrow {
    width: 1em;
    height: 1em;
    vertical-align: -0.14em;
    margin: 0 0.1em;
    color: var(--color-text-muted);
}

@media (prefers-reduced-motion: reduce) {
    .sample-chevron { transition: none; }
}

.sample-group-button span,
.sample-group-button small {
    display: block;
}

.sample-root-folder span,
.sample-root-folder small {
    grid-column: 1;
}

.sample-group-button span {
    color: var(--color-text);
    font-weight: 700;
    font-size: 0.92em;
}

.sample-group-button small {
    margin-top: 2px;
    color: var(--color-text-secondary); /* higher contrast than muted */
    font-size: 0.72em;
}

.sample-group-button:hover {
    background: var(--color-info);
}

.sample-group-button.active {
    border-color: rgba(96, 182, 45, 0.42);
    background: rgba(96, 182, 45, 0.13);
}

.sample-folder {
    margin: 0;
    width: 100%;
    min-width: 0;
}

.sample-folder > summary {
    list-style: none;
}

.sample-folder > summary::-webkit-details-marker {
    display: none;
}

.sample-folder-button {
    box-sizing: border-box;
    display: grid;
    grid-template-columns: 16px minmax(0, 1fr) 3ch;
    align-items: center;
    column-gap: 8px;
    width: 100%;
    min-height: 24px;
    padding: 2px 6px 2px calc(2px + ((var(--depth, 1) - 1) * 12px));
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 0.88em;
}

summary.sample-folder-button {
    display: grid;
}

.sample-folder-button::before {
    content: "";
    width: 16px;
    color: var(--color-text-muted);
    font-size: 1.5em;
    line-height: 1;
    text-align: center;
}

.sample-folder > summary.sample-folder-button::before {
    content: "▸";
}

.sample-folder[open] > summary.sample-folder-button::before {
    content: "▾";
}

.sample-folder-button span {
    overflow: hidden;
    color: var(--color-text-secondary);
    font-size: 0.78em;
    font-weight: 600;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sample-folder-button small {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.58em;
    line-height: 1;
    min-width: 0;
    text-align: right;
    white-space: nowrap;
}

.sample-folder-button:hover {
    background: rgba(96, 182, 45, 0.08);
}

.sample-folder-button.active {
    border-color: transparent;
    background: rgba(96, 182, 45, 0.1);
}

.sample-folder-button.active span {
    color: var(--color-text);
}

.sample-folder-children {
    display: flex;
    flex-direction: column;
    gap: 1px;
    width: 100%;
    min-width: 0;
}

.dropdown-section {
    padding: 4px 0;
}

/* Items hidden unless the "?debug_menu_items" URL flag is set (e.g. dead links).
   Selectors must out-specify ".dropdown-menu a { display: block }" (0,1,1),
   so they are scoped to ".dropdown-menu a.debug-only" (0,2,1). */
.debug-only {
    display: none;
}

.dropdown-menu a.debug-only {
    display: none;
}

body.show-debug-menu .dropdown-menu a.debug-only {
    display: block;
}

.dropdown-section h4 {
    margin: 8px 0 4px 0;
    font-size: 0.78em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    font-weight: 700;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 4px;
    white-space: nowrap;
}

.dropdown-menu a {
    color: var(--color-text-secondary);
    padding: 6px 0;
    text-decoration: none;
    display: block;
    margin: 0;
    font-size: 0.9em;
}

.dropdown-menu a:hover {
    color: var(--color-text);
}

/* Dialog Styles */
.dialog-overlay {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 26, 26, 0.4);
}

.dialog {
    background-color: var(--color-surface);
    margin: 80px auto;
    padding: 0;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    width: 80%;
    max-width: 500px;
    box-shadow: 0 8px 28px rgba(26, 26, 26, 0.18);
}

.dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px 16px 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.dialog-header h2 {
    margin: 0;
    color: var(--color-text);
    font-size: 1.4em;
    font-weight: 800;
}

.dialog-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background-color 0.15s;
}

.dialog-close:hover {
    background-color: var(--color-info);
    color: var(--color-text);
}

.dialog-content {
    padding: 20px 24px 24px 24px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.dialog-content p {
    margin: 0 0 16px 0;
    text-wrap: balance;
}

.dialog-content p:last-child {
    margin-bottom: 0;
}

.dialog-list {
    margin: 0 0 4px 0;
    padding: 0;
    list-style: none;
}

.dialog-list li {
    position: relative;
    padding-left: 26px;
    margin-bottom: 8px;
    line-height: 1.5;
}

.dialog-list li:last-child {
    margin-bottom: 0;
}

.dialog-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-green-dark);
    font-weight: 800;
}

/* OpenUSD runtime build info, presented as a labelled box. The native
   <fieldset>/<legend> gives the "interrupted outline" (the border breaks around
   the label) for free, and the title attribute carries a hover tooltip. */
.runtime-info-box {
    margin: 0 0 16px;
    padding: 8px 12px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    /* No fill — a clean outline lets the legend cleanly interrupt the border. */
    background: transparent;
    min-width: 0; /* reset the fieldset's min-content intrinsic width */
    cursor: help; /* signals the tooltip is there */
}

.runtime-info-legend {
    padding: 0 6px;
    font-family: var(--font-body);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    /* Nudge down so the label sits optically centered on the border line. */
    transform: translateY(2px);
}

.runtime-info {
    margin: 0;
    color: var(--color-text);
    font-family: var(--font-code);
    font-size: 0.78rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.dialog-content a {
    color: var(--color-link);
    text-decoration: none;
}

/* Needle Cloud mentions use the brand green rather than the generic link purple. */
.dialog-content a.cloud-link {
    color: var(--color-green-dark);
    font-weight: 700;
    white-space: nowrap; /* keep the logo glued to "Needle Cloud" */
}

.needle-logo-inline {
    width: 1.15em;
    height: 1.15em;
    vertical-align: -0.22em; /* center the mark against the text */
    margin-right: 5px;
}

.dialog-content a:hover {
    text-decoration: underline;
}

.dialog-actions {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    /* One link per row. align-items:flex-start keeps each link's hit/underline
       area to its own width rather than stretching across the dialog. */
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

.dialog-actions a {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--color-link);
    text-decoration: none;
    font-weight: 600;
}

/* Leading icon on each About link — inherits the link colour via currentColor. */
.dialog-actions a svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.dialog-actions a:hover {
    text-decoration: underline;
    cursor: pointer;
}

/* The export dialog carries a wider CTA row (Download GLB + the long Upload button),
   so give it more room than the default 500px clamp to keep them on one line. */
#export-dialog .dialog {
    max-width: 560px;
}

/* Export dialog call-to-action: Needle Cloud primary, browser download secondary. */
.dialog-cta {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

/* Secondary action on the left of the CTA row: a soft neutral-grey pill button —
   clearly clickable, but visually subordinate to the blue Upload primary. */
#export-download-direct {
    padding: 9px 18px;
    border: 1px solid rgba(26, 26, 26, 0.09);
    border-radius: 999px;
    background-color: rgba(26, 26, 26, 0.06);
    color: var(--color-text);
    text-decoration: none;
    transition: background-color 0.15s, border-color 0.15s;
}

#export-download-direct:hover {
    background-color: rgba(26, 26, 26, 0.12);
    border-color: rgba(26, 26, 26, 0.16);
    color: var(--color-text);
    text-decoration: none;
}

/* Scoped under .dialog-cta to out-specify ".dialog-content a" (0,1,1), which
   would otherwise paint the label link-purple on the green button. */
.dialog-cta .cta-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: auto; /* push the primary action to the right; secondary stays left */
    background-color: var(--color-usd-blue);
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    padding: 9px 18px;
    border-radius: 999px;
    transition: background-color 0.15s;
}

.dialog-cta .cta-primary svg {
    flex: none;
}

.dialog-cta .cta-primary:hover {
    background-color: var(--color-usd-blue-dark);
    color: #fff;
    text-decoration: none;
}

.cta-secondary {
    background: none;
    border: none;
    padding: 9px 4px;
    color: var(--color-text-secondary);
    font-family: inherit;
    font-size: 1em;
    font-weight: 600;
    text-decoration: underline;
    cursor: pointer;
}

.cta-secondary:hover {
    color: var(--color-text);
}

/* Crisp open/close animation for all dialogs: the backdrop fades while the panel
   lifts + scales in. JS (openDialogAnimated/closeDialogAnimated) sets display,
   then toggles .is-open, and hides after the fade-out. Because the resting state
   is opacity:0, every dialog MUST be opened via openDialogAnimated — a plain
   display toggle would leave it invisible. */
.dialog-overlay {
    opacity: 0;
    transition: opacity 0.14s ease;
}

.dialog-overlay.is-open {
    opacity: 1;
}

.dialog-overlay .dialog {
    opacity: 0;
    transform: translateY(-6px) scale(0.97);
    transform-origin: top center;
    transition: opacity 0.18s ease, transform 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
}

.dialog-overlay.is-open .dialog {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Respect users who prefer reduced motion: show/hide instantly. */
@media (prefers-reduced-motion: reduce) {
    .dialog-overlay,
    .dialog-overlay .dialog,
    .header-overflow-menu {
        transition: none;
    }
}

/* Feedback form (inside #feedback-dialog) */
.feedback-form {
    display: flex;
    flex-direction: column;
}

.feedback-label {
    font-size: 0.85em;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.feedback-label:not(:first-child) {
    margin-top: 14px;
}

.feedback-optional {
    font-weight: 600;
    color: var(--color-text-muted);
}

.feedback-textarea,
.feedback-input {
    width: 100%;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 0.95em;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    padding: 10px 12px;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.feedback-textarea {
    resize: vertical;
    min-height: 96px;
    line-height: 1.4;
}

.feedback-textarea:focus,
.feedback-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(130, 106, 237, 0.18);
}

/* Honeypot: visually removed but still present in the DOM so bots fill it.
   Kept off-screen rather than display:none (which some bots skip). */
.feedback-hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.feedback-status {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--color-text-secondary);
    /* Fills the left of the CTA row, pushing the Send button to the right edge.
       Works even when empty (auto margin absorbs the free space). */
    margin-right: auto;
}

.feedback-status.is-error {
    color: #b3261e;
}

.feedback-status.is-success {
    color: var(--color-green-dark);
}

/* The feedback submit reuses .cta-primary but is a <button>, so reset the UA
   border/typography the export dialog's <a> never had. */
button.cta-primary {
    border: none;
    font-family: inherit;
    font-size: 1em;
    cursor: pointer;
}

.cta-primary[disabled] {
    opacity: 0.6;
    cursor: default;
}

/* Sample Library flyout — a second column of the dropdown mega-menu, revealed
   on the same hover as the link menu (no click, no separate popover). */
.gallery-flyout {
    display: flex;
    flex-direction: column;
    width: 640px;
    max-width: 72vw;
    border-left: 1px solid var(--border-subtle);
    background-color: var(--color-page);
    padding: 0 12px 12px 12px;
    /* No max-height here — the grid inside is the scroll container and caps its
       own height. Capping the flyout too would clip the grid's last rows. */
}

.gallery-panel-head {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    margin: 0 -12px 10px -12px;
    padding: 12px;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(244, 249, 243, 0.96);
    backdrop-filter: blur(8px);
}

.gallery-panel-title {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.gallery-panel-head h4 {
    margin: 0;
    font-size: 0.78em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    font-weight: 700;
    white-space: nowrap;
}

.gallery-panel-subtitle {
    font-size: 0.72em;
    color: var(--color-text-secondary); /* higher contrast than muted */
    font-weight: 600;
    white-space: nowrap;
}

/* Brand logo left of each converter label. */
.conv-logo {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
}

/* The Needle crystal mark sits inside a padded square viewBox and reads small,
   so give it a bit more size, aspect-preserved. It keeps its brand colours when
   unselected; on the selected pill it's whitened to match the white label. */
.conv-logo.conv-logo-needle {
    width: auto;
    height: 18px;
}

/* The glTF logo is a wide (2:1) wordmark — let it keep its aspect. */
.conv-logo.conv-logo-gltf {
    width: auto;
    height: 12px;
}

/* Brand-coloured converter logos are whitened on the selected (dark-blue) pill
   to match the white label. (three / omniverse use currentColor and turn white
   on their own.) */
.converter-toggle button.active .conv-logo-needle,
.converter-toggle button.active .conv-logo-blender,
.converter-toggle button.active .conv-logo-adobe,
.converter-toggle button.active .conv-logo-gltf {
    filter: brightness(0) invert(1);
}

/* Shared segmented toggle. */
.converter-toggle {
    display: inline-flex;
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    overflow: hidden;
    flex-shrink: 0;
    background: rgba(240, 244, 239, 0.86);
}

.converter-toggle[hidden] {
    display: none;
}

.converter-toggle button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: rgba(240, 244, 239, 0.72);
    border: none;
    border-left: 1px solid var(--border-subtle);
    color: var(--color-text-secondary);
    font-family: inherit;
    font-size: 0.72em;
    min-width: 68px;
    min-height: 29px;
    padding: 4px 9px;
    cursor: pointer;
    transition: background-color 0.15s, box-shadow 0.15s, color 0.15s;
    white-space: nowrap;
}

.converter-toggle button:first-child {
    border-left: none;
}

.converter-toggle button > * {
    pointer-events: none;
}

.converter-toggle button:hover {
    background-color: rgba(255, 255, 255, 0.78);
    color: var(--color-text);
}

.converter-toggle button.active {
    /* Selected: dark USD blue fill with white text (flipped from the old light
       fill + blue text). Applies to both the engine and converter toggles. */
    background: var(--color-usd-blue-dark);
    color: #fff;
    box-shadow: none;
    font-weight: 700;
}

.converter-label {
    display: inline-flex;
    align-items: baseline;
    line-height: 1;
}

.converter-name {
    font-weight: 700;
}

.converter-toggle-inline {
    background: rgba(255, 255, 255, 0.78);
    /* Stronger outline so the segmented control reads clearly on the page. */
    border-color: var(--border-strong);
    border-radius: 11px;
}

.converter-toggle-inline button {
    font-size: 0.72em;
    min-width: 62px;
    min-height: 26px;
    padding: 3px 9px;
    /* Match the outer outline contrast on the inter-segment dividers. */
    border-left-color: var(--border-strong);
}

/* Engine switch (Needle | three.js) — the renderer chooser in the pill.
   Placed AFTER ".converter-toggle button" so its larger size wins the
   equal-specificity cascade (the shared 0.72em ≈ 10px is far too small for this
   primary control). Adds press feedback per design-eng (buttons must feel they
   were heard). */
.viewer-mode-toggle button {
    min-width: 78px;
    min-height: 30px;
    padding: 5px 13px;
    font-size: 0.85rem; /* ~13.6px — was an effective ~10px */
    letter-spacing: 0.01em;
    transition: background-color 0.15s ease,
                color 0.15s ease,
                box-shadow 0.15s ease,
                transform 0.12s cubic-bezier(0.23, 1, 0.32, 1);
}

.viewer-mode-toggle button:active {
    transform: scale(0.97); /* subtle press feedback */
}

@media (prefers-reduced-motion: reduce) {
    .viewer-mode-toggle button:active {
        transform: none;
    }
}

.gallery-status {
    font-size: 0.82em;
    color: var(--color-text-muted);
    margin: 0 0 8px 0;
}

.gallery-status.error {
    color: #b3261e;
}

.gallery-status[hidden] {
    display: none;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    padding: 2px;
    /* Self-contained scroll container. A definite max-height here (viewport
       units, not %) makes the grid scroll on its own — it does NOT depend on a
       definite height propagating down the flex chain, which never resolves
       because the dropdown is an absolutely-positioned hover popover. */
    max-height: 60vh;
    overflow-y: auto;
    /* Size rows to content and pack from the top. Without these, the cards
       (which use overflow:hidden, giving them an auto-minimum of 0) let the grid
       stretch its rows to fill the fixed height — collapsing each thumbnail to a
       ~3px strip instead of overflowing into the scroll area. */
    grid-auto-rows: max-content;
    align-content: start;
}

/* Each card is an "a.file" so it reuses the existing URL-load handler. The
   "#container" prefix is needed to out-specify "#container a" (1,0,1), which
   would otherwise force its own padding/margin onto these <a> cards. */
#container .gallery-card {
    display: flex;
    flex-direction: column;
    position: relative;
    padding: 0;
    margin: 0;
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    overflow: hidden;
    text-decoration: none;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

#container .gallery-card:hover {
    border-color: var(--color-green-dark);
    box-shadow: 0 4px 14px rgba(26, 26, 26, 0.12);
    transform: translateY(-1px);
    text-decoration: none;
}

#container .gallery-card.active {
    border-color: var(--color-green-dark);
    box-shadow: 0 0 0 2px var(--color-green-dark);
}

.gallery-thumb-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    flex: 0 0 auto;
    background: var(--color-surface);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-thumb {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    user-select: none;
    -webkit-user-drag: none;
}

.gallery-card-body {
    position: relative;
    flex: 0 0 auto;
    padding: 7px 9px 9px 9px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: rgba(255, 255, 255, 0.94);
    border-top: 1px solid var(--border-subtle);
}

/* "#container" prefix beats "#container a span" (1,0,2) for the card labels. */
#container .gallery-name {
    font-size: 0.82em;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#container .gallery-meta {
    font-size: 0.7em;
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Narrow screens: stack the gallery under the links instead of beside them. */
@media (max-width: 720px) {
    /* Anchor the menu to the viewport instead of the (centered) button, so it
       can't run off-screen. It drops down as a near-full-width panel below the
       header and scrolls as one. */
    .dropdown {
        position: static;
    }
    .dropdown-content {
        position: fixed;
        /* Just below the one-row pill (~51px). #top-center's transform makes it
           the containing block, so this is measured from its top (viewport 5px),
           i.e. the menu opens ~viewport 59px — snug under the pill. */
        top: 54px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        flex-direction: column;
        width: 94vw;
        max-width: 94vw;
        max-height: calc(100dvh - 72px);
        overflow-y: auto;
        z-index: 1000;
    }
    /* Center the overflow popover under the pill on phones instead of anchoring
       it to the button's right edge (mirrors .dropdown-content above). The extra
       translateX(-50%) composes with the shared fade/lift transform, so the
       origin flips to top-center to match. */
    .header-overflow-menu {
        position: fixed;
        top: 54px;
        left: 50%;
        right: auto;
        transform: translateX(-50%) translateY(-6px) scale(0.97);
        transform-origin: top center;
    }
    .header-overflow.menu-open .header-overflow-menu {
        transform: translateX(-50%) translateY(0) scale(1);
    }
    .gallery-flyout {
        width: auto;
        max-width: none;
        border-left: none;
        border-top: 1px solid var(--border-subtle);
    }
    /* Stack the title above the converter toggle so the (logo-widened) toggle
       gets the full panel width instead of overflowing the right edge. */
    .gallery-panel-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
    /* Let the whole panel scroll as one on mobile rather than a nested grid. */
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        max-height: none;
    }
}

/* Narrow desktop/tablet: keep the primary workflow in the pill, and move
   secondary actions into the overflow menu before they collide with the canvas
   controls below. */
@media (max-width: 1080px) {
    .app-wordmark {
        display: none;
    }
    #about-link,
    .feedback-button,
    #export-gltf {
        display: none;
    }
    .header-overflow {
        display: inline-flex;
    }
    .filename-bar {
        width: min(96vw, 760px);
        justify-content: center;
        flex-wrap: wrap;
        row-gap: 6px;
    }
    .filename-bar .filename {
        max-width: min(72vw, 560px);
    }
    .loaded-converter-control {
        order: 3;
        flex-basis: 100%;
        justify-content: center;
    }
    .loaded-converter-control::before {
        display: none;
    }
    .converter-toggle-inline {
        max-width: 96vw;
        overflow-x: auto;
    }
}

/* Phone widths: condense the pill so it stays one row. The secondary header
   actions are already in the overflow menu, and spacing tightens. */
@media (max-width: 560px) {
    #container {
        padding-left: 12px;
        padding-right: 12px;
        font-size: 0.85em;
    }
    .needle-logo {
        height: 22px;
    }
    .dropdown-button {
        margin: 0 2px;
        padding-left: 8px;
        padding-right: 8px;
    }
    .viewer-mode-toggle button {
        min-width: 64px;
    }
    .filename-bar {
        max-width: 96vw;
    }
    .loaded-converter-control {
        gap: 4px;
        flex-wrap: wrap;
    }
    .loaded-converter-control > span {
        flex-basis: 100%;
        text-align: center;
    }
    .converter-toggle-inline {
        min-width: 0;
        max-width: 100%;
    }
}

/* Tiniest phones: the Needle logo collapses to its mark, while Load Sample keeps
   its label as the primary action. */
@media (max-width: 430px) {
    #container {
        padding-left: 8px;
        padding-right: 8px;
    }
    .needle-logo-link {
        width: 28px;
        overflow: hidden;
        padding-left: 6px;
        padding-right: 0;
        margin-right: 0;
    }
    .needle-logo {
        width: 73px;
        max-width: none;
    }
    .dropdown-button {
        padding-left: 6px;
        padding-right: 6px;
        gap: 4px;
    }
    .viewer-mode-toggle {
        margin: 0 2px;
    }
    .viewer-mode-toggle button {
        min-width: 55px;
        font-size: 0.8em;
    }
    .header-overflow-button {
        width: 30px;
        height: 30px;
    }
}

/* Very small phones (~320px): drop the About entry and tighten padding so the
   one-row pill still fits. */
@media (max-width: 380px) {
    #about-link {
        display: none;
    }
    #container {
        padding-left: 10px;
        padding-right: 10px;
    }
}

#container a {
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 8px 10px;
    margin: 0 4px;
    transition: color 0.15s linear;
}

#container a:hover, .dropdown-button:hover {
    color: var(--color-text);
    text-decoration: underline;
    cursor: pointer;
}

#container a span {
    font-size: 0.8em;
    color: var(--color-text-muted);
}

/* The header menu labels (About, Feedback) match the "Load Sample" button
   (.dropdown-button): same pill font-size and secondary colour, and they follow
   the anchor's colour on hover. The "#container .x" prefix (1,1,0) out-specifies
   "#container a span" (1,0,2). */
#container .about-text,
#container .feedback-text {
    font-size: inherit; /* = #container's 0.9em, same as .dropdown-button */
    color: inherit;     /* secondary by default, darkens on hover via #container a */
}

/* Inline SVG icons that sit left of a text label (filename, Export glTF) */
.inline-icon {
    width: 15px;
    height: 15px;
    vertical-align: -2px;
    margin-right: 5px;
    pointer-events: none;
}

/* Loaded filename is a label, not a link — no pointer, no hover underline */
.filename {
    color: var(--color-text-secondary);
    padding: 8px 10px;
    margin: 0 4px;
    cursor: default;
}

/* The Needle logo link should not show the text-link underline on hover */
#container a.needle-logo-link,
#container a.needle-logo-link:hover {
    padding: 8px 6px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

/* About link: USD logo sits left of the label, vertically centered */
.usd-logo {
    width: 18px;
    height: 18px;
    vertical-align: middle;
    margin-right: 6px;
    position: relative;
    top: -1px;
}

/* Visible focus ring on every interactive element — brand accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
    border-radius: 4px;
}

.have-custom-file a.file.hide {
    display: none;
}

/* Hide Clear button when no file is loaded */
#container:not(.have-custom-file) .clear-button {
    display: none;
}

/* Shared tooltip portal. The element is created by viewer-app.js at document
   root so it escapes segmented-control overflow and modal/dropdown clipping. */
.ui-tooltip {
    position: fixed;
    top: 0;
    left: 0;
    max-width: min(300px, calc(100vw - 24px));
    padding: 8px 11px;
    border-radius: 8px;
    background: var(--color-text);
    color: #fff;
    box-shadow: 0 6px 20px rgba(26, 26, 26, 0.22);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1.2;
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    white-space: normal;
    z-index: 100000;
    transition: opacity 0.15s ease;
}

.ui-tooltip.visible {
    opacity: 1;
    visibility: visible;
}

.ui-tooltip::before {
    content: "";
    position: absolute;
    left: var(--tooltip-arrow-left, 50%);
    transform: translateX(-50%);
    border: 5px solid transparent;
}

.ui-tooltip[data-placement="bottom"]::before {
    top: -10px;
    border-bottom-color: var(--color-text);
}

.ui-tooltip[data-placement="top"]::before {
    bottom: -10px;
    border-top-color: var(--color-text);
}

/* When no file is loaded the Export button stays visible but inert and uses
   the disabled tooltip copy. */
#container:not(.have-custom-file) .export-button {
    opacity: 0.5;
    cursor: default;
}

/* Don't give the dimmed button the interactive hover darken/underline. */
#container:not(.have-custom-file) .export-button:hover {
    color: var(--color-text-secondary);
    text-decoration: none;
}

/* Hide filename display when no file is loaded */
/* Centered top stack: the header pill on top, the loaded-file row below it.
   Absolutely positioned and horizontally centered; the pill and file row are
   stacked so the file row always sits just under the pill, whatever its
   height. */
#top-center {
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    /* Above the "What's New" banner (110): the transform makes #top-center a
       stacking context, so the open menu inside it can only rise above the
       banner if #top-center itself does. */
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    max-width: 96vw;
}

/* The file row is a sibling of #container inside #top-center, so the "no file
   loaded" hide rule uses the sibling combinator. */
#container:not(.have-custom-file) ~ .filename-bar {
    display: none;
}

/* Loaded-file row: filename, optional converter, and Clear. No background; it
   floats as plain text over the canvas. Only actions receive pointer events. */
.filename-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 96vw;
    pointer-events: none;
}

.filename-bar .filename {
    display: inline-flex;
    align-items: center;
    min-width: 0;
    flex: 0 1 auto;
    padding: 0;
    margin: 0;
    font-size: 0.9em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.filename-bar .filename-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.filename-sep {
    display: inline-flex;
    align-items: center;
    color: var(--color-text-muted);
    line-height: 1;
    user-select: none;
}

/* When the "converted with" control is visible it already separates the row, so
   the dash before Clear is redundant — drop it (kept for plain files, where it's
   the only separator between the filename and Clear). */
.loaded-converter-control:not([hidden]) ~ .filename-sep {
    display: none;
}

.filename-bar .clear-button {
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9em;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
}

.filename-bar .clear-button .inline-icon {
    width: 14px;
    height: 14px;
    margin-right: 0;
    vertical-align: 0;
}

.filename-bar .clear-button:hover {
    color: var(--color-text);
    text-decoration: underline;
}

.loaded-converter-control {
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    color: var(--color-text-secondary);
    font-size: 0.9em;
    white-space: nowrap;
}

.loaded-converter-control[hidden] {
    display: none;
}

.loaded-converter-control::before {
    content: "–";
    color: var(--color-text-muted);
    user-select: none;
}

.loaded-converter-control > span {
    color: inherit;
    white-space: nowrap;
}

/* "What's New" banner — small, subtle, bottom-right announcement card that
   rotates through items from the Needle marketer feed. Sits above the footer
   terminal bar (z-index 100) but is small enough not to crowd the canvas. */
.whats-new {
    position: fixed;
    right: 14px;
    /* clear the footer terminal bar (single-line height + breathing room) */
    bottom: 58px;
    z-index: 110;
    width: 300px;
    max-width: calc(100vw - 28px);
    border-radius: 12px;
    box-shadow: 0 8px 28px rgba(26, 26, 26, 0.18);
    overflow: hidden;
    /* hidden state: nudged down + faded; .is-visible animates it in */
    opacity: 0;
    transform: translateY(12px);
    /* transition every animatable property change (fade/slide in + out) */
    transition: all 0.25s ease;
    pointer-events: none;
}

.whats-new.is-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.whats-new-link {
    display: block;
    /* banner.css from the feed sets the background + readable text colour;
       these are the layout defaults it themes on top of */
    background-color: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    padding: 14px 38px 14px 16px;
    font-family: var(--font-body);
    line-height: 1.35;
    /* ease the themed background/text change between rotated items
       (solid backgrounds + text colour tween; CSS can't tween gradients,
       which the card's opacity fade covers instead) */
    transition: all 0.25s ease;
}

.whats-new-kicker {
    display: block;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    opacity: 0.7;
    margin-bottom: 3px;
}

.whats-new-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 800;
}

.whats-new-subtitle {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    opacity: 0.9;
    margin-top: 2px;
}

.whats-new-cta {
    display: inline-block;
    margin-top: 8px;
    font-size: 0.78rem;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Dismiss (×) — small, lives in the top-right corner of the card */
.whats-new-dismiss {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 24px;
    height: 24px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 6px;
    /* inherit the banner's text colour, kept subtle until hover */
    color: currentColor;
    background: transparent;
    opacity: 0.55;
    cursor: pointer;
    transition: opacity 0.15s, background-color 0.15s;
}

.whats-new-dismiss:hover {
    opacity: 1;
    background: rgba(127, 127, 127, 0.18);
}

.whats-new-dismiss svg {
    width: 14px;
    height: 14px;
}

/* Rotation indicator dots */
.whats-new-dots {
    position: absolute;
    bottom: 8px;
    right: 10px;
    display: flex;
    gap: 5px;
    pointer-events: none;
}

.whats-new-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.3;
    transition: opacity 0.2s;
}

.whats-new-dot.is-active {
    opacity: 0.85;
}

@media (max-width: 520px) {
    .whats-new {
        right: 10px;
        left: 10px;
        width: auto;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
    /* No spin — show a calm, evenly-coloured ring instead of a frozen arc */
    .spinner {
        border-color: var(--color-green);
        opacity: 0.7;
    }
}

@media (prefers-contrast: more) {
    #container,
    .dropdown-content,
    .dialog {
        border-color: var(--border-strong);
        box-shadow: none;
    }
}