:root {
            --accent: #667eea;
            --accent-2: #764ba2;
            --ink: #2b2b3a;
            --muted: #6b6b7b;
            --line: #e3e3ea;
            --surface: #ffffff;
            --soft: #f6f6fa;
            --ok: #2e8b57;
            --warn-bg: #fff6e0;
            --warn-ink: #7a5300;
            --err-bg: #fdecec;
            --err-ink: #9b1c1c;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
            color: var(--ink);
            min-height: 100vh;
            padding: 32px 16px;
        }

        .container {
            background: var(--surface);
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
            padding: 36px;
            max-width: 980px;
            margin: 0 auto;
        }

        .header { text-align: center; margin-bottom: 28px; }
        .header h1 { color: var(--accent); font-size: 2.2em; margin-bottom: 8px; }
        .header p { color: var(--muted); font-size: 1.05em; }

        .layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
            gap: 32px;
            align-items: start;
        }

        .controls { display: flex; flex-direction: column; gap: 22px; }

        fieldset { border: none; display: flex; flex-direction: column; gap: 12px; }
        legend {
            font-size: 0.78em;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 10px;
        }

        label, .label { display: block; color: var(--ink); font-weight: 600; font-size: 0.92em; margin-bottom: 6px; }

        input[type="text"], input[type="number"], select {
            width: 100%;
            padding: 11px 13px;
            border: 2px solid var(--line);
            border-radius: 10px;
            font: inherit;
            font-size: 0.98em;
            color: var(--ink);
            background: var(--surface);
            transition: border-color 0.2s;
        }

        input:focus-visible, select:focus-visible, button:focus-visible, .file-btn:focus-within {
            outline: 3px solid rgba(102, 126, 234, 0.45);
            outline-offset: 2px;
        }
        input[type="text"]:focus, input[type="number"]:focus, select:focus { border-color: var(--accent); outline: none; }

        .hint { color: var(--muted); font-size: 0.82em; margin-top: 6px; line-height: 1.4; }

        .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

        input[type="color"] {
            width: 100%;
            height: 44px;
            padding: 4px;
            border: 2px solid var(--line);
            border-radius: 10px;
            background: var(--surface);
            cursor: pointer;
        }
        input[type="color"]:disabled { opacity: 0.4; cursor: not-allowed; }

        .check { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 0.92em; cursor: pointer; }
        .check input { width: 18px; height: 18px; accent-color: var(--accent); }

        .file-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
        .file-btn {
            position: relative;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 16px;
            border: 2px dashed var(--accent);
            border-radius: 10px;
            color: var(--accent);
            font-weight: 600;
            font-size: 0.92em;
            cursor: pointer;
            background: var(--soft);
        }
        .file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
        .file-name { color: var(--muted); font-size: 0.88em; overflow-wrap: anywhere; }

        .range-row { display: flex; align-items: center; gap: 12px; }
        .range-row input[type="range"] { flex: 1; accent-color: var(--accent); }
        .range-row output { min-width: 3.2em; text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); font-size: 0.9em; }

        .btn {
            padding: 13px 18px;
            border: none;
            border-radius: 10px;
            font: inherit;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
        }
        .btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
        .btn-primary { background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%); color: #fff; }
        .btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4); }
        .btn-secondary { background: #4caf50; color: #fff; }
        .btn-secondary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(76, 175, 80, 0.35); }
        .btn-ghost { background: var(--soft); color: var(--ink); padding: 9px 14px; font-size: 0.88em; }
        .btn-ghost:hover { background: var(--line); }

        .preview-col { position: sticky; top: 24px; display: flex; flex-direction: column; gap: 14px; }

        .stage {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 24px;
            border-radius: 15px;
            border: 1px solid var(--line);
            background: repeating-conic-gradient(#ececf1 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
            aspect-ratio: 1 / 1;
        }
        #qrCanvas {
            display: block;
            width: 100%;
            height: auto;
            max-width: 320px;
            border-radius: 6px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        #qrCanvas.hidden { visibility: hidden; }

        .meta { font-size: 0.85em; color: var(--muted); text-align: center; line-height: 1.5; font-variant-numeric: tabular-nums; }

        .downloads { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

        .notice { border-radius: 10px; padding: 10px 12px; font-size: 0.86em; line-height: 1.45; }
        .notice[hidden] { display: none; }
        .notice.warn { background: var(--warn-bg); color: var(--warn-ink); }
        .notice.err { background: var(--err-bg); color: var(--err-ink); }
        .notice.ok { background: #e9f6ee; color: #1f5e3a; }

        .footer { text-align: center; margin-top: 32px; color: #999; font-size: 0.85em; line-height: 1.6; }
        .footer a { color: var(--accent); text-decoration: none; }
        .footer a:hover { text-decoration: underline; }

        @media (max-width: 860px) {
            .container { padding: 24px 18px; }
            .header h1 { font-size: 1.7em; }
            .layout { grid-template-columns: 1fr; gap: 24px; }
            .preview-col { position: static; order: -1; }
            .stage { padding: 16px; max-width: 360px; width: 100%; margin: 0 auto; }
        }

        @media (max-width: 480px) {
            .row { grid-template-columns: 1fr; }
        }

        @media (prefers-reduced-motion: reduce) {
            * { transition: none !important; }
        }
    
.toolbox-return{max-width:980px;margin:0 auto 20px;display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;color:#fff;font:14px/1.6 system-ui}.toolbox-return a{color:inherit;min-height:44px;display:inline-flex;align-items:center;font-weight:700}.toolbox-return span{align-self:center}.footer{color:var(--muted)}:root{--accent:#4b53b5;--muted:#606070}:root[data-theme="dark"]{color-scheme:dark;--accent:#c5beff;--accent-2:#201b35;--ink:#f5eff9;--muted:#c8bfd3;--line:#675c77;--surface:#252032;--soft:#342c44}html[data-theme="dark"] body{background:#171323}a:focus-visible{outline:3px solid #ffd66e;outline-offset:4px}@media(max-width:480px){body{padding:20px 12px}.downloads{grid-template-columns:1fr}.toolbox-return span{order:3;width:100%}}.btn-secondary{background:#267437;color:#fff}:root[data-theme="dark"] .btn-primary{background:#c5beff;color:#211831}:root[data-theme="dark"] .btn-secondary{background:#a9dfb3;color:#14351c}