.ptl-app {
    --ptl-accent: #2563eb;
    --ptl-accent-hover: #1d4ed8;
    --ptl-border: #e5e7eb;
    --ptl-text: #1f2937;
    --ptl-muted: #6b7280;
    --ptl-bg: #ffffff;
    --ptl-bg-soft: #f9fafb;

    max-width: 720px;
    margin: 24px auto;
    padding: 20px;
    background: var(--ptl-bg);
    color: var(--ptl-text);
    border: 1px solid var(--ptl-border);
    border-radius: 14px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .05);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    line-height: 1.6;
    box-sizing: border-box;
}
.ptl-app *, .ptl-app *::before, .ptl-app *::after { box-sizing: border-box; }

/* Tabs */
.ptl-tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--ptl-bg-soft);
    border-radius: 10px;
    margin-bottom: 16px;
}
.ptl-tab {
    flex: 1;
    padding: 8px 10px;
    border: 0;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--ptl-muted);
    transition: all .15s;
    font-family: inherit;
}
.ptl-tab:hover { color: var(--ptl-text); }
.ptl-tab.is-active {
    background: #fff;
    color: var(--ptl-accent);
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(0, 0, 0, .06);
}

/* Drop zone */
.ptl-drop {
    border: 2px dashed var(--ptl-border);
    border-radius: 12px;
    padding: 28px 16px;
    text-align: center;
    cursor: pointer;
    transition: all .15s;
    background: var(--ptl-bg-soft);
    margin-bottom: 12px;
}
.ptl-drop:hover, .ptl-drop.is-over {
    border-color: var(--ptl-accent);
    background: #eff6ff;
}
.ptl-drop:focus-visible {
    outline: 2px solid var(--ptl-accent);
    outline-offset: 2px;
}
.ptl-drop-icon {
    display: inline-block;
    padding: 3px 10px;
    background: #fee2e2;
    color: #dc2626;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .5px;
    margin-bottom: 8px;
}
.ptl-drop-text { color: var(--ptl-text); }
.ptl-hint { font-size: 12px; color: var(--ptl-muted); margin-top: 4px; }
.ptl-link {
    background: none;
    border: 0;
    padding: 0;
    color: var(--ptl-accent);
    cursor: pointer;
    font: inherit;
    text-decoration: underline;
}

/* File list */
.ptl-files {
    list-style: none;
    margin: 0 0 12px;
    padding: 0;
}
.ptl-file {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--ptl-bg-soft);
    border: 1px solid var(--ptl-border);
    border-radius: 8px;
    margin-bottom: 6px;
    transition: box-shadow .12s, opacity .12s, background .12s;
}
.ptl-file[draggable="true"] { cursor: grab; }
.ptl-file.is-dragging { opacity: .4; cursor: grabbing; }
.ptl-file.is-drop-before { box-shadow: inset 0 3px 0 var(--ptl-accent); }
.ptl-file.is-drop-after  { box-shadow: inset 0 -3px 0 var(--ptl-accent); }

.ptl-drag-handle {
    color: var(--ptl-muted);
    font-size: 12px;
    letter-spacing: -2px;
    user-select: none;
    flex-shrink: 0;
}
.ptl-file-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.ptl-file-meta { font-size: 12px; color: var(--ptl-muted); flex-shrink: 0; }
.ptl-file-actions { display: flex; gap: 4px; flex-shrink: 0; }

.ptl-btn {
    border: 1px solid var(--ptl-border);
    background: #fff;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 12px;
    padding: 2px 8px;
    color: var(--ptl-text);
    line-height: 1.4;
}
.ptl-btn:hover:not(:disabled) { background: #f3f4f6; }
.ptl-btn:disabled { opacity: .4; cursor: not-allowed; }
.ptl-icon { width: 24px; padding: 2px 0; text-align: center; }
.ptl-remove:hover:not(:disabled) { background: #fee2e2; color: #dc2626; border-color: #fecaca; }

/* Options */
.ptl-opt { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.ptl-opt[hidden] { display: none; }
.ptl-field { display: flex; flex-direction: column; gap: 4px; }
.ptl-field[hidden] { display: none; }
.ptl-field > span { font-size: 12px; color: var(--ptl-muted); }
.ptl-field input[type="text"],
.ptl-field select {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--ptl-border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
    background: #fff;
    color: var(--ptl-text);
}
.ptl-field input[type="text"]:focus,
.ptl-field select:focus {
    outline: none;
    border-color: var(--ptl-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}

/* Actions */
.ptl-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 4px;
}
.ptl-run {
    padding: 10px 22px;
    background: var(--ptl-accent);
    color: #fff;
    border: 0;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background .15s;
}
.ptl-run:hover:not(:disabled) { background: var(--ptl-accent-hover); }
.ptl-run:disabled { opacity: .6; cursor: not-allowed; }
.ptl-clear {
    padding: 10px 16px;
    background: #fff;
    border: 1px solid var(--ptl-border);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    font-family: inherit;
    color: var(--ptl-text);
}
.ptl-clear:hover { background: #f3f4f6; }
.ptl-status { font-size: 13px; color: var(--ptl-muted); }
.ptl-status.is-error { color: #dc2626; }

/* Progress */
.ptl-progress {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}
.ptl-progress[hidden] { display: none; }
.ptl-progress-track {
    flex: 1;
    height: 6px;
    background: var(--ptl-bg-soft);
    border-radius: 3px;
    overflow: hidden;
}
.ptl-progress-bar {
    height: 100%;
    width: 0;
    background: var(--ptl-accent);
    border-radius: 3px;
    transition: width .2s ease;
}
.ptl-progress-text {
    font-size: 12px;
    color: var(--ptl-muted);
    min-width: 100px;
    text-align: right;
    white-space: nowrap;
}

/* Busy 状态：禁用可交互元素 */
.ptl-app.is-busy .ptl-drop,
.ptl-app.is-busy .ptl-tab,
.ptl-app.is-busy .ptl-file-actions,
.ptl-app.is-busy .ptl-clear {
    pointer-events: none;
    opacity: .5;
}
.ptl-app.is-busy .ptl-file[draggable="true"] { cursor: default; }

/* Result */
.ptl-result { margin-top: 12px; }
.ptl-result:empty { display: none; }
.ptl-download {
    display: block;
    padding: 10px 14px;
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    border-radius: 8px;
    color: #047857;
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 6px;
    word-break: break-all;
}
.ptl-download:hover { background: #d1fae5; }
.ptl-multi p { margin: 0 0 8px; font-size: 13px; color: var(--ptl-muted); }
.ptl-download-all {
    margin-top: 4px;
    padding: 8px 16px;
    background: var(--ptl-accent);
    color: #fff;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
}
.ptl-download-all:hover { background: var(--ptl-accent-hover); }

/* Footer */
.ptl-footer {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--ptl-border);
    font-size: 12px;
    color: var(--ptl-muted);
    text-align: center;
}

@media (max-width: 480px) {
    .ptl-app { margin: 12px; padding: 14px; border-radius: 10px; }
    .ptl-tab { font-size: 13px; padding: 7px 4px; }
    .ptl-run, .ptl-clear { flex: 1; }
}
.ptl-multi-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}