/* PPT拼图功能专用样式（在 main.css 基础上补充） */

/* ---------- 左侧：上传与进度 ---------- */
#ppt-upload-btn {
    width: 100%;
}

.ppt-progress {
    position: fixed;
    top: 64px;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 0;
    width: 420px;
    max-width: 90vw;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--surface, #f8f9fa);
    border-radius: 8px;
    padding: 10px 12px;
    line-height: 1.9;
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, .12));
    z-index: 300;
    transition: opacity .4s ease;
}

.ppt-progress.fade-out {
    opacity: 0;
    pointer-events: none;
}

.ppt-progress .step {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #16a34a;
}

/* 处理中：外框边框呼吸 + 顶部流动光条（transform合成动画，不卡顿）+ spinner */
.ppt-progress.converting {
    overflow: hidden;
    border: 1px solid rgba(22, 163, 74, .35);
    animation: ppt-pulse 1.6s ease-in-out infinite;
}

@keyframes ppt-pulse {
    0%, 100% { border-color: rgba(22, 163, 74, .25); }
    50% { border-color: rgba(22, 163, 74, .65); }
}

/* 顶部横向流动的光条：用 transform 而非 left，走 GPU 合成不触发重排 */
.ppt-progress.converting::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 3px;
    width: 40%;
    background: linear-gradient(90deg, transparent, #16a34a, transparent);
    transform: translateX(-110%);
    animation: ppt-lightbar 1.4s linear infinite;
    will-change: transform;
}

@keyframes ppt-lightbar {
    from { transform: translateX(-110%); }
    to { transform: translateX(360%); }
}

/* 处理中文字前的旋转加载圈（真实DOM元素 .spin-icon，由JS插入） */
.ppt-progress .step.doing {
    color: var(--primary-accent);
    font-weight: 500;
}

.spin-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 2px;
    border: 2.5px solid rgba(22, 163, 74, .25);
    border-top-color: #16a34a;
    border-radius: 50%;
    animation: ppt-spin .8s linear infinite;
    flex-shrink: 0;
}

@keyframes ppt-spin {
    to { transform: rotate(360deg); }
}

.ppt-progress .step.done {
    color: #16a34a;
}

.ppt-progress .step.error {
    color: #dc2626;
}

/* ---------- 左侧：页面选择列表 ---------- */
.slide-count-info {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
}

.slide-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    max-height: 260px;
    overflow-y: auto;
    padding: 2px;
    margin: 0 0 10px 0;
}

.slide-list-empty {
    grid-column: 1 / -1;
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
    padding: 16px 0;
}

#slide-list-actions{
    display: none;
}
.slide-thumb {
    position: relative;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 16 / 9;
    background: #eee;
}

.slide-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
}

.slide-thumb .slide-num {
    position: absolute;
    left: 3px;
    top: 3px;
    font-size: 11px;
    line-height: 16px;
    padding: 0 5px;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.45);
    color: #fff;
}

.slide-thumb .slide-check {
    position: absolute;
    right: 3px;
    top: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 1.5px solid rgba(255, 255, 255, 0.9);
    background: rgba(0, 0, 0, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    color: transparent;
    font-size: 11px;
}

.slide-thumb.selected {
    border-color: var(--primary-accent);
}

.slide-thumb.selected .slide-check {
    background: var(--primary-accent);
    border-color: var(--primary-accent);
    color: #fff;
}

.slide-thumb.disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* ---------- 左侧：列数与每列张数步进器 ---------- */
.stepper label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
}

.stepper-btns {
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.stepper-btns button {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--surface, #f3f4f6);
    cursor: pointer;
    font-size: 16px;
    color: var(--text-primary);
}

.stepper-btns button:hover {
    background: var(--primary-accent);
    color: #fff;
}

.stepper-btns span {
    flex: 1;
    text-align: center;
    font-weight: 500;
}

.col-rows-list .col-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.col-rows-list .col-row label {
    font-size: 14px;
}

.col-rows-list .stepper-btns {
    width: 108px;
}

/* ---------- 底部中间操作提示（页面加载即显示，悬停画布后淡出） ---------- */
#center-content {
    position: relative;
}

#canvas-hint {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(23, 43, 77, .8);
    color: #fff;
    padding: .5rem 1rem;
    border-radius: 8px;
    font-size: .8rem;
    white-space: normal;
    max-width: 90%;
    text-align: center;
    opacity: 1;
    transition: opacity .4s ease;
    pointer-events: none;
    z-index: 200;
}

#center-content:hover #canvas-hint {
    opacity: 0;
}

/* ---------- 模板视角切换按钮（复用画布比例按钮组样式） ---------- */
#view-mode-btns button {
    padding: .5rem;
    background-color: #fafbfc;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all .2s ease;
    cursor: pointer;
}

#view-mode-btns button:hover {
    background-color: #f4f5f7;
}

#view-mode-btns button.active,
#layout-mode-btns button.active {
    background-color: #e9f2ff;
    color: var(--primary-accent);
    border-color: var(--primary-accent);
    font-weight: 600;
}

#layout-mode-btns button {
    padding: .5rem;
    background-color: #fafbfc;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all .2s ease;
    cursor: pointer;
}

#layout-mode-btns button:hover {
    background-color: #f4f5f7;
}

/* 紧凑模式下的画布尺寸提示 */
.canvas-mode-tip {
    font-size: .75rem;
    color: #e0504b;
    margin: -8px 0 12px 0;
    display: none;
}

.canvas-mode-tip.show {
    display: block;
}

/* ---------- 中央画布 ---------- */
#ppt-canvas-outer {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 1.5rem 1.5rem 0 1.5rem;
    position: relative;
}

#ppt-canvas-scale {
    position: relative;
    transform-origin: top center;
    box-shadow: var(--shadow-md);
}

#ppt-canvas {
    position: relative;
    overflow: hidden;
    background-color: #ffffff;
}

.ppt-cell {
    position: absolute;
    overflow: hidden;
    background-color: transparent;
}

.ppt-cell img {
    width: 100%;
    height: 100%;
    object-fit: contain; /* 完整显示不裁剪，格子内居中 */
    display: block;
    -webkit-user-drag: none;
    user-select: none;
}

/* ---------- 列间拖拽分隔线（仅预览，导出时排除） ---------- */
.col-divider {
    position: absolute;
    width: 12px;
    cursor: col-resize;
    touch-action: none;
    z-index: 5;
}

.col-divider::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 2px;
    border-radius: 1px;

}

.col-divider:hover::after,
.col-divider:active::after {
    left: 4px;
    width: 4px;
    background: #16a34a;
}

/* 列内行间拖拽分隔线（仅预览，导出时排除） */
.row-divider {
    position: absolute;
    height: 12px;
    cursor: row-resize;
    touch-action: none;
    z-index: 5;
}

.row-divider::after {
    content: '';
    position: absolute;
    top: 5px;
    left: 0;
    right: 0;
    height: 2px;
    border-radius: 1px;
}

.row-divider:hover::after,
.row-divider:active::after {
    top: 4px;
    height: 4px;
    background: #16a34a;
}

/* 空格子（未上传/页面不足时显示） */
.ppt-cell-empty {
    background: rgba(148, 163, 184, .08);
    border: 1px dashed #cbd5e1;
    box-sizing: border-box;
}

/* 格子拖动互换：目标格高亮、拖动中半透明 */
.ppt-cell.drag-over {
    outline: 3px solid #16a34a;
    outline-offset: -3px;
}

.ppt-cell.dragging {
    opacity: .4;
}

/* ---------- 水印层 ---------- */
#wm-layer {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

#wm-layer .wm-item {
    position: absolute;
    white-space: nowrap;
    color: #000;
    font-weight: 600;
}

/* ---------- 右侧：背景选择 ---------- */
#bg-color-grid,
#bg-gradient-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}

.bg-swatch {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    padding: 0;
    background-size: cover;
    background-position: center;
}

.bg-swatch.active {
    outline: 2px solid var(--primary-accent);
    outline-offset: 1px;
}

#color-picker {
    width: 42px;
    height: 32px;
    cursor: pointer;
}

/* ---------- 空状态兼容 ---------- */
.hidden {
    display: none !important;
}

#canvas-h-input{
    text-align: left;
    display: block;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: #fff;
    transition: border-color .2s, box-shadow .2s;
    font-size: .875rem;
    padding: 0.6rem;
    color: var(--text-secondary);
}