/* ═══ /upload 工作台 — upload.css（固定外壳：画布/背景/下载/上传按钮钉死，仅画布内容随状态切换）═══ */

.wb-section { padding: 28px 0 72px; background: var(--c-bg-alt); min-height: 72vh; }
.wb-section .container { max-width: 1160px; }

/* 显式 display 的元素（如 .compare inline-block）会盖掉 hidden 属性，这里强制 */
.wb-canvas > [hidden] { display: none !important; }

/* ── 主区 grid：画布与背景卡同行等高；下载按钮在画布下方；重新上传在背景卡下方 ── */
.wb-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-rows: auto auto auto;
  gap: 16px 22px;
  align-items: stretch;
}
.wb-canvas { grid-column: 1; grid-row: 1; }
.wb-bgcard { grid-column: 2; grid-row: 1; } /* 与画布同行 → 拉伸到画布同高（内容后续充实）*/
.wb-downloads { grid-column: 1; grid-row: 2; }
.wb-reupload { grid-column: 2; grid-row: 2; width: 100%; }
.wb-meta { grid-column: 1; grid-row: 3; }

/* 画布容器：固定尺寸框（不随图片内容变化；图片由 JS contain 适配）*/
.wb-canvas {
  position: relative; height: clamp(420px, 60vh, 640px);
  display: flex; align-items: center; justify-content: center;
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); padding: 22px; overflow: hidden;
  transition: border-color .15s ease, background .15s ease;
}
.wb-canvas.dragover { border-color: var(--c-primary); background: #f5f3ff; }

/* 空态占位（画布框内的虚线上传区）*/
.wb-ph {
  width: 100%; max-width: 480px; margin: 0 auto; text-align: center; cursor: pointer;
  border: 2.5px dashed #c7d2fe; border-radius: var(--radius-lg);
  padding: 44px 24px 34px; color: var(--c-primary);
  transition: all .2s ease;
}
.wb-ph:hover, .wb-canvas.dragover .wb-ph { border-color: var(--c-primary); background: #fafaff; transform: translateY(-2px); }
.wb-ph h2 { font-size: 20px; color: var(--c-text); margin: 12px 0 6px; }
.wb-ph .dz-or { color: var(--c-text-muted); margin-bottom: 16px; font-size: 14px; }
.wb-ph .dz-paste { color: var(--c-text-muted); font-size: 13px; margin-top: 14px; }
.wb-ph .dz-error { color: #dc2626; font-size: 14px; font-weight: 600; margin-top: 10px; }

/* 处理态（原图 + 扫描线 + 文字，画布内居中）*/
.wb-process { text-align: center; width: 100%; }
.wb-process .process-img-wrap { margin: 0 auto; }
.wb-process img { max-width: none; max-height: none; }
.wb-process .progress-text { font-weight: 700; margin-top: 16px; }
.wb-process .progress-slow { color: var(--c-text-muted); font-size: 13.5px; margin-top: 8px; }

/* 结果态（对比滑块，画布内居中；canvas/img 尺寸由 JS contain 适配固定框，解除全局 max 约束防拉伸变形）*/
.wb-canvas .compare { max-width: 100%; }
.wb-canvas .compare-after canvas { max-width: none; max-height: none; }

/* meta 行（画布下方，固定）*/
.wb-meta {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 12px; color: var(--c-text-muted); font-size: 13.5px; min-height: 26px;
}
.wb-dims { font-weight: 700; color: var(--c-text); }
.wb-remain { background: var(--c-bg-soft); border-radius: 99px; padding: 3px 11px; font-size: 12.5px; font-weight: 600; }
.wb-remain.expired { background: #fef2f2; color: #b91c1c; }

/* ── 下载行（画布下方，两按钮并排）── */
.wb-dl-row { display: flex; gap: 12px; flex-wrap: wrap; }
.wb-dl { flex: 1; min-width: 200px; display: flex; flex-direction: column; align-items: center; gap: 2px; padding-top: 12px; padding-bottom: 12px; }
.wb-dl small { font-weight: 500; opacity: .75; font-size: 11.5px; }
.wb-downloads .result-note { margin-top: 4px; }

/* ── 卡片（背景卡=右侧与画布等高）── */
.wb-card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); padding: 18px 20px;
}
.wb-card-title { font-size: 15px; font-weight: 800; letter-spacing: -.01em; margin-bottom: 14px; }

/* 背景色板竖排网格（工作台侧栏）*/
.bg-tools-col { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 0; }

/* ── 历史作品 ── */
.wb-history { margin-top: 40px; }
.wb-hist-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.wb-hist-title { font-size: 18px; font-weight: 800; letter-spacing: -.01em; }
.wb-hist-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(128px, 1fr)); gap: 14px; }
.wb-hist-card {
  position: relative; border: 1.5px solid var(--c-border); border-radius: var(--radius);
  overflow: hidden; background: #fff; cursor: pointer; transition: all .15s; padding: 0;
}
.wb-hist-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.wb-hist-card.current { border-color: var(--c-primary); box-shadow: 0 0 0 3px #eef2ff; }
.wb-hist-thumb { display: block; width: 100%; height: 104px; object-fit: cover; background:
  linear-gradient(45deg, #eef1f6 25%, transparent 25%, transparent 75%, #eef1f6 75%),
  linear-gradient(45deg, #eef1f6 25%, transparent 25%, transparent 75%, #eef1f6 75%);
  background-size: 18px 18px; background-position: 0 0, 9px 9px; }
.wb-hist-info { padding: 7px 10px 8px; }
.wb-hist-time { display: block; font-size: 12px; color: var(--c-text-muted); }
.wb-hist-state { display: inline-block; margin-top: 3px; font-size: 11px; font-weight: 700; color: var(--c-success); }
.wb-hist-card.expired .wb-hist-thumb { filter: grayscale(1); opacity: .45; }
.wb-hist-card.expired .wb-hist-state { color: #b91c1c; }
.wb-hist-card.expired:hover { transform: none; box-shadow: none; border-color: var(--c-border); cursor: not-allowed; }
.wb-hist-empty { color: var(--c-text-muted); font-size: 14px; padding: 8px 0 2px; }

/* ── 响应式（单列按 DOM 顺序：画布 → 背景卡 → 下载行 → 重新上传 → meta）── */
@media (max-width: 900px) {
  .wb-main { display: flex; flex-direction: column; gap: 16px; }
  .wb-canvas { height: clamp(300px, 48vh, 520px); padding: 14px; }
  .wb-bgcard { min-height: 0; }
  .wb-dl { min-width: 0; }
  .wb-hist-row { grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); }
}