.pti-app {
    --pti-card: #ffffff;
    --pti-border: #e2e8f0;
    --pti-text: #1e293b;
    --pti-muted: #64748b;
    --pti-primary: #3b82f6;
    --pti-primary-hover: #2563eb;
    --pti-success: #10b981;
    --pti-error: #ef4444;
    --pti-radius: 14px;

    max-width: 780px;
    margin: 2.5em auto;
    padding: 0 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    color: var(--pti-text);
}

/* 拖拽区 */
.pti-drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: var(--pti-radius);
    background: var(--pti-card);
    padding: 48px 24px;
    text-align: center;
    transition: border-color .2s, background .2s, transform .15s;
}
.pti-drop-zone.is-dragover {
    border-color: var(--pti-primary);
    background: #eff6ff;
    transform: scale(1.01);
}
.pti-drop-icon {
    font-size: 34px;
    color: var(--pti-primary);
    margin-bottom: 12px;
}
.pti-drop-title {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 4px;
}
.pti-drop-sub {
    font-size: 13px;
    color: var(--pti-muted);
    margin: 6px 0;
}
.pti-drop-hint {
    font-size: 12px;
    color: var(--pti-muted);
    margin: 16px 0 0;
}

/* 按钮 */
.pti-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 9px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .15s, box-shadow .15s, opacity .15s;
    line-height: 1.4;
}
.pti-btn:disabled { opacity: .45; cursor: not-allowed; }
.pti-btn--primary { background: var(--pti-primary); color: #fff; }
.pti-btn--primary:hover:not(:disabled) { background: var(--pti-primary-hover); box-shadow: 0 4px 14px rgba(59,130,246,.35); }
.pti-btn--secondary { background: #fff; color: var(--pti-text); border-color: var(--pti-border); }
.pti-btn--secondary:hover:not(:disabled) { background: #f8fafc; }
.pti-btn--ghost { background: transparent; color: var(--pti-primary); border: 1px solid var(--pti-primary); padding: 8px 20px; }
.pti-btn--ghost:hover { background: #eff6ff; }

/* 文件信息 */
.pti-file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 14px;
    padding: 12px 16px;
    background: var(--pti-card);
    border: 1px solid var(--pti-border);
    border-radius: 10px;
    font-size: 13px;
}
#pti-file-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#pti-file-pages { color: var(--pti-muted); flex-shrink: 0; }

/* 设置卡片 */
.pti-card {
    background: var(--pti-card);
    border: 1px solid var(--pti-border);
    border-radius: var(--pti-radius);
    padding: 20px;
    margin-top: 16px;
}
.pti-settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
}
.pti-field { display: flex; flex-direction: column; gap: 7px; }
.pti-field label { font-size: 12px; font-weight: 600; color: var(--pti-muted); text-transform: uppercase; letter-spacing: .04em; }
.pti-field select {
    width: 100%;
    padding: 9px 12px;
    font-size: 14px;
    border: 1px solid var(--pti-border);
    border-radius: 8px;
    background: #fff;
    color: var(--pti-text);
    outline: none;
}
.pti-field select:focus { border-color: var(--pti-primary); box-shadow: 0 0 0 3px rgba(59,130,246,.15); }

/* 操作栏 */
.pti-actions-bar { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }

/* 进度条 */
.pti-progress-wrap { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.pti-progress-bar { flex: 1; height: 8px; background: #e2e8f0; border-radius: 999px; overflow: hidden; }
.pti-progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, #3b82f6, #60a5fa); border-radius: 999px; transition: width .25s ease; }
.pti-progress-text { font-size: 12px; font-weight: 600; color: var(--pti-muted); min-width: 38px; text-align: right; }

/* 状态 */
.pti-status { margin-top: 14px; font-size: 13px; color: var(--pti-muted); min-height: 1.4em; }
.pti-status--success { color: var(--pti-success); }
.pti-status--error { color: var(--pti-error); }



/* 预览网格 */
.pti-preview { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin-top: 22px; }
.pti-preview-item {
    background: var(--pti-card);
    border: 1px solid var(--pti-border);
    border-radius: 10px;
    overflow: hidden;
    transition: box-shadow .15s, transform .15s;
    display: flex;
    flex-direction: column;
}
.pti-preview-item:hover { box-shadow: 0 4px 16px rgba(0,0,0,.08); transform: translateY(-2px); }
.pti-preview-item img { width: 100%; height: auto; display: block; background: #f1f5f9; }

/* 新增：底部操作栏 */
.pti-preview-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    border-top: 1px solid var(--pti-border);
    background: #fff;
    margin-top: auto;
}
.pti-preview-name {
    font-size: 11px;
    color: var(--pti-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}
.pti-btn-single {
    background: none;
    border: none;
    color: var(--pti-primary);
    font-size: 12px;
    cursor: pointer;
    padding: 3px 6px;
    border-radius: 4px;
    flex-shrink: 0;
    margin-left: 8px;
    font-weight: 600;
}
.pti-btn-single:hover {
    background: #eff6ff;
}

@media (max-width: 520px) {
    .pti-drop-zone { padding: 34px 16px; }
    .pti-settings { grid-template-columns: 1fr; }
    .pti-preview { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
}


.pti-drop-zone:hover {
    border-color: var(--pti-primary);
}
.pti-drop-zone:hover .pti-drop-icon {
    transform: translateY(-3px);
    transition: transform 0.2s ease;
}