a { color: var(--brand-ink); }
        h1 { margin: 0; font-size: clamp(1.6rem, 3vw, 2.4rem); line-height: 1.1; letter-spacing: 0; }
        p { color: var(--ink-2); font-size: 1rem; line-height: 1.55; }

        .tk-header {
            display: grid;
            gap: 14px;
            margin-bottom: 20px;
        }
        .tk-breadcrumbs {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            font-size: .82rem;
            color: var(--ink-3);
        }
        .tk-breadcrumbs a {
            color: var(--ink-3);
            text-decoration: none;
        }
        .tk-header-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-items: center;
        }
        .tk-header-intro {
            display: grid;
            gap: 8px;
            padding: 18px 20px;
            border: 1px solid var(--line);
            border-radius: 18px;
            background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(250,247,242,0.88));
            box-shadow: var(--shadow-sm);
        }
        .tk-header-topline {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .tk-header-intro p {
            margin: 0;
        }
        .tk-flow-copy {
            font-size: 1rem;
            color: var(--ink-2);
        }
        .tk-use-case {
            font-size: .92rem;
            color: var(--ink-3);
            line-height: 1.55;
        }
        .tk-format-strip {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            padding: 10px 14px;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 12px;
            font-size: .82rem;
        }
        .tk-format-label {
            font-weight: 600;
            color: var(--ink);
        }
        .tk-format-chip {
            display: inline-flex;
            align-items: center;
            padding: 2px 10px;
            border-radius: 8px;
            font-size: .76rem;
            font-weight: 700;
            text-transform: uppercase;
        }
        .tk-format-chip.source {
            background: var(--ok-soft);
            color: var(--ok);
        }
        .tk-format-chip.target {
            background: var(--info-soft);
            color: var(--info);
        }
        .tk-format-meta {
            margin-left: auto;
            font-size: .74rem;
            color: var(--ink-4);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 3px 10px;
            border-radius: 20px;
            font-size: .78rem;
            font-weight: 600;
        }
        .badge-available { background: var(--ok-soft); color: var(--ok); }
        .badge-planned { background: var(--warn-soft); color: var(--warn); }
        .badge-batch { background: var(--info-soft); color: var(--info); }
        .badge-single { background: var(--paper-2); color: var(--ink-3); }

        .tk-scenarios {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 8px;
            margin-top: 14px;
        }
        .tk-scenario {
            padding: 10px 14px;
            background: linear-gradient(180deg, var(--surface), var(--paper));
            border: 1px solid var(--line);
            border-radius: 12px;
            font-size: .84rem;
            color: var(--ink-2);
            box-shadow: var(--shadow-sm);
        }
        .tk-scenario strong { color: var(--ink); }

        .tk-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 294px;
            gap: 18px;
            align-items: start;
        }
        .tk-main {
            display: grid;
            gap: 14px;
        }
        .tk-side {
            display: grid;
            gap: 12px;
            position: sticky;
            top: 92px;
        }

        /* Drop zone — Cloud Design warm */
        .tk-drop {
            position: relative;
            min-height: 150px;
            border: 2px dashed var(--line-2);
            border-radius: 22px;
            background:
                radial-gradient(circle at 1px 1px, rgba(212, 184, 148, 0.12) 1px, transparent 0) 0 0 / 18px 18px,
                linear-gradient(180deg, #fffefb, #fffaf3);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 22px 20px;
            cursor: pointer;
            transition: border-color .15s ease, background .15s ease;
            box-shadow: var(--shadow-sm);
        }
        .tk-drop:hover,
        .tk-drop.drag-over {
            border-color: var(--brand);
            background:
                radial-gradient(circle at 1px 1px, rgba(212, 184, 148, 0.12) 1px, transparent 0) 0 0 / 18px 18px,
                linear-gradient(180deg, var(--brand-soft), #fffaf3);
        }
        .tk-drop-icon {
            font-size: 2.4rem;
            color: var(--ink-4);
        }
        .tk-drop-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink);
        }
        .tk-drop-hint {
            font-size: .82rem;
            color: var(--ink-4);
        }
        .tk-drop input[type="file"] {
            position: absolute;
            inset: 0;
            opacity: 0;
            cursor: pointer;
        }

        .tk-file-list {
            display: none;
            grid-template-columns: 1fr 1fr;
            gap: 6px;
            margin-top: 4px;
        }
        .tk-file-chip {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 10px;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 8px;
            font-size: .78rem;
            color: var(--ink-2);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .tk-file-chip .remove {
            margin-left: auto;
            color: var(--ink-4);
            cursor: pointer;
            font-size: .7rem;
            flex-shrink: 0;
        }

        /* Results panel */
        .tk-result {
            display: none;
            border-radius: 14px;
            border: 1px solid var(--line);
            overflow: hidden;
        }
        .tk-result-header {
            padding: 12px 16px;
            font-weight: 700;
            font-size: .9rem;
            border-bottom: 1px solid var(--line);
        }
        .tk-result-header.ok { background: var(--ok-soft); color: var(--ok); }
        .tk-result-header.warn { background: var(--warn-soft); color: var(--warn); }
        .tk-result-header.fail { background: var(--danger-soft); color: var(--danger); }
        .tk-result-body {
            padding: 14px 16px;
            background: var(--surface);
            font-size: .88rem;
        }
        .tk-result-body table { width: 100%; border-collapse: collapse; font-size: .82rem; }
        .tk-result-body th, .tk-result-body td { padding: 6px 8px; text-align: left; border-bottom: 1px solid var(--paper-2); }
        .tk-result-body th { background: var(--paper-2); font-weight: 700; }
        .tk-download-link {
            display: inline-block;
            padding: 6px 16px;
            background: var(--brand);
            color: #fff;
            text-decoration: none;
            border-radius: 10px;
            font-size: .84rem;
            font-weight: 700;
            transition: background .12s ease;
        }
        .tk-download-link:hover { background: var(--brand-ink); }

        /* Settings panel — Cloud Design warm */
        .tk-panel {
            background: linear-gradient(180deg, var(--surface), rgba(255,255,255,0.92));
            border: 1px solid var(--line);
            border-radius: 16px;
            padding: 16px;
            box-shadow: var(--shadow-sm);
        }
        .tk-panel h3 {
            margin: 0 0 12px;
            font-size: .88rem;
            color: var(--ink);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .tk-panel label {
            display: block;
            margin-bottom: 12px;
            font-size: .82rem;
            color: var(--ink-2);
        }
        .tk-field-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-bottom: 12px;
        }
        .tk-field-row label {
            margin-bottom: 0;
        }
        .tk-panel select,
        .tk-panel input[type="text"],
        .tk-panel input[type="number"] {
            display: block;
            width: 100%;
            padding: 7px 10px;
            margin-top: 4px;
            border: 1px solid var(--line);
            border-radius: 10px;
            font-size: .85rem;
            background: var(--surface);
            transition: border-color .12s ease;
        }
        .tk-panel select:focus,
        .tk-panel input:focus {
            border-color: var(--brand);
            outline: none;
            box-shadow: 0 0 0 3px rgba(217, 106, 44, 0.08);
        }

        /* Action bar — sticky bottom with stronger CTA */
        .tk-action-bar-wrap {
            position: sticky;
            bottom: 12px;
            z-index: 20;
            margin-top: 8px;
        }
        .tk-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            padding: 14px 24px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: saturate(160%) blur(12px);
            border: 1px solid var(--line);
            border-radius: 18px;
            box-shadow: 0 1px 0 rgba(60, 40, 20, 0.04), 0 8px 24px -8px rgba(60, 40, 20, 0.2);
        }
        .tk-actions .primary-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--brand);
            color: #fff;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            transition: background .12s ease, transform .08s ease;
            box-shadow: 0 2px 0 rgba(160, 70, 20, 0.3);
        }
        .tk-actions .primary-btn:hover { background: var(--brand-ink); transform: translateY(-1px); }
        .tk-actions .primary-btn:active { transform: translateY(0); box-shadow: 0 1px 0 rgba(160, 70, 20, 0.3); }
        .tk-actions .primary-btn:disabled { background: var(--ink-4); cursor: not-allowed; transform: none; box-shadow: none; }
        .tk-actions .ws-link {
            font-size: .84rem;
            color: var(--ink-3);
            text-decoration: none;
            font-weight: 600;
            margin-left: auto;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .tk-actions .ws-link:hover { color: var(--brand-ink); }

        .tk-warning {
            display: none;
            margin-top: 10px;
            padding: 10px 14px;
            background: var(--warn-soft);
            border: 1px solid #ffc107;
            border-radius: 10px;
            font-size: .82rem;
            color: var(--warn);
        }

        /* Diagnostics warning */
        .tk-diag-warn {
            display: none;
            margin-top: 10px;
            padding: 10px 14px;
            background: var(--warn-soft);
            border: 1px solid #ffc107;
            border-radius: 10px;
            font-size: .82rem;
            color: var(--warn);
        }

        /* Standardized error/warning/success blocks */
        .tk-error {
            display: none;
            margin-top: 10px;
            padding: 12px 16px;
            border-radius: 12px;
            font-size: .84rem;
            line-height: 1.5;
            border: 1px solid transparent;
        }
        .tk-error.tk-error-fail {
            background: var(--danger-soft);
            border-color: var(--danger);
            color: var(--danger);
        }
        .tk-error.tk-error-warn {
            background: var(--warn-soft);
            border-color: var(--warn);
            color: var(--warn);
        }
        .tk-error.tk-error-info {
            background: var(--info-soft);
            border-color: var(--info);
            color: var(--info);
        }
        .tk-error strong {
            display: block;
            margin-bottom: 4px;
            font-weight: 700;
        }
        .tk-error .tk-error-hint {
            display: block;
            margin-top: 6px;
            font-size: .78rem;
            color: var(--ink-3);
            font-weight: 400;
        }
        .tk-error .tk-error-dismiss {
            float: right;
            cursor: pointer;
            font-size: 1rem;
            opacity: .6;
            line-height: 1;
            padding: 0 2px;
        }
        .tk-error .tk-error-dismiss:hover { opacity: 1; }
        .tk-error-msg {
            display: block;
            margin-top: 4px;
        }
        .tk-error-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: 8px;
        }
        .tk-error-action {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 14px;
            border-radius: 8px;
            font-size: .8rem;
            font-weight: 600;
            text-decoration: none;
            color: #fff;
        }
        .tk-error-fail .tk-error-action { background: var(--danger); }
        .tk-error-warn .tk-error-action { background: var(--warn); color: #fff; }
        .tk-error-info .tk-error-action { background: var(--info); }

        /* Preflight guardrails — visible constraints before upload */
        .tk-preflight {
            margin-top: 8px;
            padding: 8px 14px;
            background: var(--paper-2);
            border: 1px solid var(--line);
            border-radius: 10px;
            font-size: .78rem;
            box-shadow: var(--shadow-sm);
        }
        .tk-preflight-row {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }
        .tk-pf-label {
            font-weight: 600;
            color: var(--ink-2);
            font-size: .76rem;
            white-space: nowrap;
        }
        .tk-preflight-summary {
            display: none;
            margin-top: 6px;
            padding: 6px 12px;
            background: var(--info-soft);
            border: 1px solid var(--info);
            border-radius: 8px;
            font-size: .78rem;
            color: var(--info);
            line-height: 1.5;
        }
        .tk-preflight-summary.has-warning {
            background: var(--warn-soft);
            border-color: #ffc107;
            color: var(--warn);
        }
        .tk-preflight-summary.has-error {
            background: var(--danger-soft);
            border-color: var(--danger);
            color: var(--danger);
        }

        .tk-coming-soon {
            padding: 18px 20px;
            background: var(--surface);
            border: 1px solid #ffc107;
            border-radius: 14px;
        }
        .tk-coming-soon h2 {
            margin: 0 0 8px;
            font-size: 1rem;
        }

        .tk-scenario-item {
            background: linear-gradient(180deg, var(--surface), var(--paper));
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 12px 14px;
            box-shadow: var(--shadow-sm);
        }
        .tk-scenario-item p { margin: 0; font-size: .82rem; color: var(--ink-2); }
        .tk-scenario-item .si-icon { font-size: 1.1rem; margin-right: 4px; }
        .tk-scenario-item .si-label { font-weight: 600; color: var(--ink); }

        .tk-side-note {
            background: var(--paper-2);
            border-color: var(--line);
        }

        .tk-side-note p {
            margin: 0;
            font-size: .8rem;
            color: var(--ink-2);
            line-height: 1.5;
        }

        @media (max-width: 820px) {
            .tk-layout { grid-template-columns: 1fr; }
            .tk-side { position: static; }
            .tk-file-list { grid-template-columns: 1fr; }
            .tk-action-bar-wrap { position: static; }
            .tk-options-grid { grid-template-columns: 1fr; }
            .tk-header-badges { gap: 4px; }
            .tk-result-card { flex-direction: column; }
            .tk-header-intro { padding: 14px 16px; }
            .tk-format-strip { flex-wrap: wrap; gap: 6px; }
            .tk-format-meta { margin-left: 0; }
            .tk-breadcrumbs { font-size: .76rem; }
        }
        @media (max-width: 540px) {
            .tk-header { padding: 0; }
            .tk-header h1 { font-size: 1.4rem; }
            .tk-header p { font-size: .9rem; }
            .tk-actions { flex-direction: column; gap: 6px; padding-bottom: calc(14px + env(safe-area-inset-bottom, 0px)); }
            .tk-actions a, .tk-actions button { width: 100%; text-align: center; }
            .tk-actions .primary-btn { justify-content: center; }
            .tk-actions .ws-link { margin-left: 0; }
            .tk-drop-zone { padding: 16px; }
            .tk-drop-zone p { font-size: .82rem; }
            .tk-side { padding: 0; }
            .tk-output-list { grid-template-columns: 1fr; }
            .tk-drop { min-height: 150px; padding: 20px 14px; }
            .tk-drop-icon { font-size: 1.8rem; }
            .tk-drop-text { font-size: .9rem; }
            .tk-panel { padding: 12px; }
            .tk-header-intro p { font-size: .86rem; }
            .tk-header-topline { gap: 4px; }
            .tk-header-badges .badge { font-size: .72rem; padding: 2px 8px; }
            .tk-format-chip { font-size: .7rem; padding: 1px 8px; }
            .tk-format-strip { font-size: .74rem; padding: 8px 10px; }
            .tk-preflight { font-size: .72rem; padding: 6px 10px; }
            .tk-scenarios { grid-template-columns: 1fr; }
            .tk-result-body table { font-size: .76rem; }
            .tk-result-body th,
            .tk-result-body td { padding: 4px 6px; }
            .result-badge { font-size: .66rem; padding: 0 5px; }
        }

        .format-badge {
            display: inline-block;
            padding: 3px 9px;
            border-radius: 8px;
            font-size: .74rem;
            font-weight: 700;
            background: var(--paper-2);
            color: var(--ink);
            margin: 1px 3px 1px 0;
            letter-spacing: .02em;
        }
        .format-badge-source { background: var(--ok-soft); color: var(--ok); }
        .format-badge-target { background: var(--info-soft); color: var(--info); }
        .result-badge {
            display: inline-block;
            padding: 1px 6px;
            border-radius: 6px;
            font-size: .72rem;
            font-weight: 600;
        }
        .result-badge-ok { background: var(--ok-soft); color: var(--ok); }
        .result-badge-fail { background: var(--danger-soft); color: var(--danger); }
        .file-count { font-size: .78rem; color: var(--ink-3); margin-top: 4px; }
        .file-act-btn { display:inline-flex; align-items:center; gap:4px; padding:4px 10px; border:1px solid var(--line); border-radius:8px; background:var(--surface); color:var(--ink-2); font-size:.75rem; font-weight:600; cursor:pointer; text-decoration:none; white-space:nowrap; transition:all .12s ease; }
        .file-act-btn:hover { border-color:var(--brand-ink); color:var(--brand-ink); background:var(--paper-2); }
        .file-act-btn.kept { background:var(--brand-soft); border-color:var(--brand); color:var(--brand-ink); }
        .fav-btn.active { background:var(--favorite); color:#fff; }
        .fav-btn.active:hover { background:#e0a030; }