:root {
            font: 400 16px "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
            color: #111;
            background-color: #0f172a;
        }
        * { box-sizing: border-box; }
        body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top, rgba(255,255,255,0.08), transparent 55%), #0f172a; display: flex; justify-content: center; }
        .surface {
            width: min(100%, 960px);
            padding: 2.5rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .panel {
            background: #ffffff;
            padding: 2rem;
            box-shadow: 0 25px 60px rgba(15,23,42,0.35);
            display: grid;
            gap: 1.25rem;
        }
        header.hero {
            color: #e2e8f0;
            text-align: center;
        }
        header.hero h1 {
            margin: 0;
            font-size: clamp(2rem, 5vw, 2.5rem);
            letter-spacing: -0.02em;
        }
        header.hero p {
            margin: 0.5rem auto 0;
            max-width: 560px;
            color: #cbd5f5;
        }
        .control-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 0.75rem;
        }
        input[type="file"], select {
            width: 100%;
            border: 1px solid #e2e8f0;
            padding: 0.9rem 1rem;
            font-size: 1rem;
            transition: border-color 0.2s, box-shadow 0.2s;
            background: #fefefe;
        }
        input[type="file"]:focus-visible, select:focus-visible {
            outline: 2px solid #2563eb;
            box-shadow: none;
        }
        .progress-wrap {
            display: flex;
            flex-direction: column;
            gap: 0.35rem;
        }
        .status-label {
            font-weight: 600;
            color: #0f172a;
        }
        .status-badge {
            font-size: 0.9rem;
            color: #475569;
            min-height: 1.4em;
        }
        .progress-bar {
            width: 100%;
            height: 10px;
            background: #e2e8f0;
            overflow: hidden;
        }
        .progress-bar span {
            display: block;
            height: 100%;
            width: 0;
            background: linear-gradient(90deg, #2563eb, #7c3aed);
            transition: width 0.2s ease;
        }
        .progress-note {
            font-size: 0.85rem;
            color: #475569;
        }
        #resultCanvas {
            width: 100%;
            background: repeating-linear-gradient(45deg, #e2e8f0, #e2e8f0 10px, #f8fafc 10px, #f8fafc 20px);
            min-height: 280px;
            object-fit: contain;
            display: none;
        }
        footer.thanks {
            background: #111827;
            color: #e2e8f0;
            padding: 1.5rem;
            border-radius: 0;
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
        }
        footer.thanks h2 {
            margin: 0 0 0.5rem;
            font-size: 1rem;
            letter-spacing: 0.05em;
        }
        footer.thanks p {
            margin: 0;
            font-size: 0.9rem;
            color: #cfd8ff;
            line-height: 1.4;
        }
        @media (max-width: 640px) {
            .surface {
                padding: 1.5rem;
            }
            .panel {
                padding: 1.5rem;
            }
        }
        footer{
            color: #e2e8f0;
        }