* {
            box-sizing: border-box;
        }

        [hidden] {
            display: none !important;
        }

        body {
            margin: 0;
            height: 100vh;
            overflow: hidden;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background: var(--background-color, #f4f4f4);
            color: var(--text-color, #333);
        }

        button,
        input,
        select {
            font: inherit;
        }

        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        a:focus-visible {
            outline: 3px solid color-mix(in srgb, var(--button-background, #007bff) 50%, transparent);
            outline-offset: 3px;
        }

        .theme-button {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            border: 0;
            border-radius: 50%;
            background: var(--container-background, #fff);
            color: var(--text-color, #333);
            box-shadow: 0 2px 8px var(--container-shadow, rgba(0, 0, 0, 0.12));
            cursor: pointer;
        }

        .theme-button .icon {
            width: 20px;
            height: 20px;
            background: url("../images/moon.svg") no-repeat center / contain;
            filter: var(--logo-filter);
        }

        .dark-theme .theme-button .icon {
            background-image: url("../images/sun.svg");
        }

        .page > .theme-button {
            position: absolute;
            top: 10px;
            right: 10px;
            z-index: 10;
        }

        .page.has-file > .theme-button {
            right: 270px;
        }

        .tool-version {
            position: absolute;
            top: 56px;
            right: 13px;
            z-index: 10;
            color: var(--text-color, #777);
            font-size: 0.68rem;
            font-weight: 650;
            line-height: 1;
            opacity: 0.68;
            pointer-events: none;
        }

        .page.has-file > .tool-version {
            right: 273px;
        }

        .page {
            position: relative;
            display: flex;
            flex-direction: column;
            height: 100vh;
        }

        .page.has-file .hero-area {
            display: none;
        }

        .hero-area {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            flex: 1;
            padding: 20px;
            text-align: center;
        }

        .converter {
            display: contents;
        }

        .converter .drop-zone-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: min(520px, 100%);
        }

        .drop-zone {
            width: 100%;
            min-height: 280px;
            display: grid;
            place-items: center;
            padding: 34px 22px;
            border: 2px dashed var(--inactive-border, #c9c9c9);
            border-radius: 13px;
            text-align: center;
            cursor: pointer;
            transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
        }

        .drop-zone:hover,
        .drop-zone.is-dragging {
            border-color: var(--button-background, #007bff);
            background: color-mix(in srgb, var(--button-background, #007bff) 8%, transparent);
        }

        .drop-zone.is-dragging {
            transform: scale(1.01);
        }

        .file-input {
            position: absolute;
            width: 1px;
            height: 1px;
            overflow: hidden;
            clip: rect(0 0 0 0);
            clip-path: inset(50%);
            white-space: nowrap;
        }

        .drop-title {
            display: block;
            margin: 0 0 7px;
            color: var(--text-color, #222);
            font-size: 1.15rem;
            font-weight: 750;
        }

        .drop-hint {
            display: block;
            margin: 0;
            color: var(--text-color, #777);
            font-size: 0.9rem;
        }

        .workspace {
            display: none;
            grid-template-columns: minmax(0, 1fr) 260px;
            flex: 1;
            min-height: 0;
        }

        .page.has-file .workspace {
            display: grid;
        }

        .viewer {
            position: relative;
            overflow: hidden;
            background: color-mix(in srgb, var(--container-background, #fff) 94%, var(--button-background, #007bff));
        }

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

        .preview-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            z-index: 5;
            display: none;
            padding: 6px 9px;
            border: 1px solid color-mix(in srgb, var(--button-background, #007bff) 35%, transparent);
            border-radius: 7px;
            background: color-mix(in srgb, var(--container-background, #fff) 90%, transparent);
            color: var(--text-color, #333);
            font-size: 0.72rem;
            font-weight: 700;
            backdrop-filter: blur(8px);
        }

        .preview-badge.is-visible {
            display: block;
        }


        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
            padding: 12px;
            border-left: 1px solid var(--border, #ddd);
            background: var(--container-background, #fff);
        }

        .sidebar-section {
            padding: 10px 0;
        }

        .sidebar-section + .sidebar-section {
            border-top: 1px solid var(--border, #ddd);
        }

        .sidebar-section h3 {
            margin: 0 0 10px;
            color: var(--text-color, #333);
            font-size: 0.82rem;
            font-weight: 750;
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }

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

        .file-info .file-name {
            overflow: hidden;
            color: var(--text-color, #222);
            font-size: 0.88rem;
            font-weight: 700;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .file-info .file-meta {
            color: var(--text-color, #777);
            font-size: 0.75rem;
        }

        .radio-group {
            display: flex;
            gap: 4px;
            margin-top: 4px;
        }

        .radio-option {
            flex: 1;
        }

        .radio-option input {
            position: absolute;
            opacity: 0;
            width: 0;
            height: 0;
        }

        .radio-option span {
            display: block;
            text-align: center;
            padding: 6px 4px;
            border: 1px solid var(--border, #ddd);
            border-radius: 6px;
            background: var(--input-bg-color, #fff);
            color: var(--text-color, #888);
            font-size: 0.72rem;
            font-weight: 700;
            cursor: pointer;
            transition: border-color 120ms, background 120ms, color 120ms;
        }

        .check-option {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            color: var(--text-color, #555);
            font-size: 0.76rem;
            line-height: 1.35;
            cursor: pointer;
        }

        .check-option input {
            margin: 2px 0 0;
            accent-color: var(--button-background, #007bff);
        }

        .check-option small {
            display: block;
            margin-top: 2px;
            color: var(--text-color, #888);
            font-size: 0.68rem;
        }

        .diagnostics {
            color: var(--text-color, #666);
            font-size: 0.74rem;
            line-height: 1.35;
        }

        .diagnostics-empty {
            color: var(--text-color, #888);
        }

        .diagnostic-grid {
            display: grid;
            gap: 6px;
            margin: 0;
        }

        .diagnostic-grid div {
            display: flex;
            align-items: baseline;
            justify-content: space-between;
            gap: 10px;
            min-width: 0;
        }

        .diagnostic-grid dt {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--text-color, #777);
            font-weight: 650;
        }

        .diagnostic-swatch {
            width: 9px;
            height: 9px;
            flex: 0 0 auto;
            border-radius: 16px;
        }

        .diagnostic-swatch.is-cylinder {
            background: #ffb020;
        }

        .diagnostic-swatch.is-cone {
            background: #d86bff;
        }

        .diagnostic-swatch.is-fillet {
            background: #f472b6;
        }

        .diagnostic-swatch.is-hole {
            background: #27d7a7;
        }

        .diagnostic-swatch.is-risk {
            background: #d33b32;
        }

        .diagnostic-grid dd {
            margin: 0;
            color: var(--text-color, #222);
            font-weight: 760;
            text-align: right;
        }

        .diagnostics-note {
            margin: 8px 0 0;
            color: var(--text-color, #777);
            font-size: 0.7rem;
        }

        .diagnostics-note.is-warning {
            color: #d16b21;
        }

        .overlay-controls {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 3px;
            margin-top: 10px;
            padding: 3px;
            border: 1px solid var(--border, #ddd);
            border-radius: 7px;
            background: var(--input-bg-color, #fff);
        }

        .overlay-button {
            min-width: 0;
            padding: 5px 3px;
            border: 0;
            border-radius: 5px;
            background: transparent;
            color: var(--text-color, #777);
            font-size: 0.7rem;
            font-weight: 750;
            cursor: pointer;
        }

        .overlay-button.is-active {
            background: color-mix(in srgb, var(--button-background, #007bff) 12%, transparent);
            color: var(--button-background, #007bff);
        }

        .overlay-button:disabled {
            color: var(--text-color, #bbb);
            cursor: not-allowed;
        }

        .radio-option input:checked + span {
            border-color: var(--button-background, #007bff);
            background: color-mix(in srgb, var(--button-background, #007bff) 10%, transparent);
            color: var(--button-background, #007bff);
        }

        .radio-option input:focus-visible + span {
            outline: 3px solid color-mix(in srgb, var(--button-background, #007bff) 50%, transparent);
            outline-offset: 2px;
        }

        .radio-option input:disabled + span {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .button {
            min-height: 34px;
            padding: 7px 13px;
            border: 0;
            border-radius: 7px;
            background: var(--button-background, #007bff);
            color: #fff;
            font-size: 0.82rem;
            font-weight: 700;
            cursor: pointer;
        }

        .button:hover:not(:disabled) {
            background: var(--button-hover, #0056b3);
        }

        .button.secondary {
            border: 1px solid var(--border, #ddd);
            background: transparent;
            color: var(--text-color, #555);
        }

        .button.secondary:hover:not(:disabled) {
            background: var(--container-background, #f4f4f4);
        }

        .button:disabled {
            background: var(--button-disabled, #b9dbff);
            color: var(--button-disabled-text, #fff);
            cursor: not-allowed;
        }

        .button.secondary:disabled {
            background: transparent;
            color: var(--text-color, #bbb);
            border-color: var(--inactive-border, #ddd);
        }

        .button.small {
            min-height: 30px;
            padding: 5px 10px;
            font-size: 0.78rem;
        }

        .button.small.is-placeholder {
            visibility: hidden;
            pointer-events: none;
        }

        .export-actions {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .status-bar {
            display: none;
            align-items: center;
            gap: 12px;
            min-height: 36px;
            padding: 6px 14px;
            border-top: 1px solid var(--border, #ddd);
            background: var(--container-background, #fff);
            font-size: 0.82rem;
        }

        .page.has-file .status-bar,
        .page.has-status .status-bar {
            display: flex;
        }

        .status {
            min-width: 0;
            flex: 1;
            color: var(--link, #007bff);
            font-weight: 650;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .status.is-error {
            color: #d33b32;
        }

        .progress {
            width: 120px;
            height: 6px;
            flex-shrink: 0;
            overflow: hidden;
            border-radius: 99px;
            background: var(--inactive-border, #ddd);
            border: 0;
            opacity: 0;
            appearance: none;
        }

        .progress.is-active {
            opacity: 1;
        }

        .progress::-webkit-progress-bar {
            border-radius: inherit;
            background: var(--inactive-border, #ddd);
        }

        .progress::-webkit-progress-value {
            border-radius: inherit;
            background: var(--button-background, #007bff);
            transition: width 180ms ease-out;
        }

        .progress::-moz-progress-bar {
            border-radius: inherit;
            background: var(--button-background, #007bff);
            transition: width 180ms ease-out;
        }

        .diagnostics-empty.is-warning {
            color: #d16b21;
        }

        @media (prefers-reduced-motion: reduce) {
            .drop-zone,
            .progress::-webkit-progress-value,
            .progress::-moz-progress-bar {
                transition: none;
            }
        }

        .note {
            margin: 18px 2px 0;
            padding: 14px 16px;
            border-radius: 10px;
            background: var(--blockquote, #fff7e7);
            color: var(--text-color, #555);
            font-size: 0.86rem;
            line-height: 1.5;
            text-align: left;
        }

        .privacy {
            margin: 18px 0 0;
            color: var(--text-color, #777);
            font-size: 0.82rem;
            text-align: center;
        }