/* ========================================================================== */
/* 页脚与响应式适配                                                            */
/* ========================================================================== */

.site-footer {
  display: none;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 24px;
  padding: 12px 24px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
  text-align: center;
}

.app-shell:has(#source-panel:not([hidden])) > .site-footer {
  display: flex;
}

@media (max-width: 640px) {
  .topbar {
    min-height: 62px;
    padding: 10px 16px;
  }

  .privacy-note {
    max-width: 120px;
    font-size: 10px;
  }

  .site-footer {
    gap: 3px 16px;
    padding: 8px 12px;
    font-size: 10px;
  }

}

@media (max-width: 900px) {
  .source-panel {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    overflow-x: auto;
  }

  .panel-heading {
    display: none;
  }

  .source-grid {
    min-width: 760px;
    grid-template-columns: 230px 1fr;
  }

  .file-summary strong {
    max-width: 32vw;
  }

  .toolbar-actions {
    min-width: 0;
  }

  .search-box {
    min-width: 160px;
    flex: 1;
  }

}

@media (max-width: 620px) {
  .privacy-note {
    display: none;
  }

  .source-panel {
    min-height: 48px;
    padding: 5px 8px;
    flex-basis: 48px;
  }

  .drop-zone {
    padding: 5px 7px;
  }

  .drop-zone .button {
    width: auto;
  }

  .viewer-toolbar {
    min-height: 82px;
    padding: 6px 8px;
    flex-basis: 82px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 5px 8px;
  }

  .file-summary strong {
    max-width: calc(100vw - 80px);
  }

  .toolbar-actions {
    grid-column: 1 / -1;
    align-items: stretch;
    flex-direction: row;
  }

  .segmented button {
    flex: 1;
  }

  .search-box {
    min-width: 100px;
    width: auto;
    flex: 1;
  }

  .sheet-bar,
  .status-line {
    padding-left: 12px;
    padding-right: 12px;
  }

}

/* ========================================================================== */
/* 居中文件空状态与单行查看器工具栏                                          */
/* ========================================================================== */

/*
 * workspace 作为初始选择卡片的定位容器。
 * 文件未打开时，下面的 viewer-card 只提供安静的满屏画布，不显示多余工具栏。
 */
.workspace {
  position: relative;
}

.app-shell:has(#source-panel:not([hidden])) {
  background:
    linear-gradient(rgba(21, 122, 98, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 122, 98, 0.022) 1px, transparent 1px),
    radial-gradient(circle at 50% 42%, #ffffff 0, #f6faf8 60%, #eef5f2 100%);
  background-size: 32px 32px, 32px 32px, auto;
}

.app-shell:has(#source-panel:not([hidden])) .viewer-card.is-empty {
  background: transparent;
}

.viewer-card.is-empty .viewer-toolbar,
.viewer-card.is-empty .status-line {
  display: none;
}

/*
 * 初始选择区属于页面空状态，而不是模态弹窗：没有遮罩和关闭按钮。
 * 使用绝对定位避免卡片占据表格布局高度；打开文件后直接通过 hidden 移除。
 */
.source-panel {
  width: min(860px, calc(100vw - 40px));
  max-height: calc(100% - 32px);
  min-height: 0;
  padding: 28px;
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 10;
  transform: translate(-50%, -50%);
  overflow: auto;
  border: 1px solid rgba(190, 211, 203, 0.95);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 16px 44px rgba(20, 65, 53, 0.09);
  opacity: 1;
  pointer-events: auto;
}

.source-panel .panel-heading {
  margin: 0 0 22px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.source-panel .eyebrow {
  margin: 0 0 5px;
  display: block;
}

.source-panel .panel-heading h1 {
  font-family: inherit;
  font-size: 25px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.source-panel .panel-heading p:not(.eyebrow) {
  margin: 7px 0 0;
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.source-panel .format-badge {
  margin-top: 2px;
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.source-panel .format-badge > span {
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f5f9f7;
  color: #547168;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.03em;
}

/* 加载或校验失败后就地显示原因，让用户可以马上修正输入并重试。 */
.source-message {
  margin: -6px 0 18px;
  padding: 12px 14px;
  border: 1px solid #efd5d1;
  border-radius: 10px;
  color: var(--danger);
  background: #fff8f7;
  font-size: 12px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.source-message details {
  margin: 0;
}

.source-message summary {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 0;
  border-radius: 4px;
  color: var(--danger);
  list-style: none;
  cursor: pointer;
  font-weight: 500;
  user-select: none;
}

.source-message summary::-webkit-details-marker {
  display: none;
}

.source-message summary::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
}

.source-message details[open] summary::before {
  transform: rotate(45deg) translate(-1px, -1px);
}

.source-message summary:hover {
  color: var(--danger);
}

.source-message summary:focus-visible {
  outline: 2px solid #b86659;
  outline-offset: 4px;
}

.source-message details p {
  margin: 10px 0 0 14px;
  padding: 0;
  color: #786560;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  line-height: 1.7;
  max-height: 160px;
  overflow: auto;
  white-space: pre-wrap;
}

.source-panel input,
.source-panel button {
  font-family: inherit;
  font-size: 13px;
}

.source-panel .source-grid {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(340px, 1.1fr);
  gap: 18px;
}

.source-panel .drop-zone {
  min-height: 170px;
  height: auto;
  padding: 24px;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  text-align: center;
  border: 1.5px dashed #9ec4b6;
  border-radius: 12px;
}

.source-panel .drop-copy {
  flex: 0 0 auto;
}

.source-panel .drop-zone:focus-within {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
}

.source-panel .drop-zone.is-dragging {
  border-style: solid;
  box-shadow: inset 0 0 0 1px var(--brand);
  background: var(--brand-soft);
}

.source-panel .drop-zone.is-dragging .upload-icon {
  color: white;
  background: var(--brand);
  border-color: var(--brand);
}

@media (prefers-reduced-motion: reduce) {
  .drop-zone {
    transition: none;
  }
}

.source-panel .upload-icon {
  width: 46px;
  height: 46px;
  border: 1px solid #cae4db;
  background: #fff;
  font-size: 24px;
}

.source-panel .drop-copy strong {
  font-size: 15px;
}

.source-panel .drop-copy small {
  margin-top: 5px;
  display: block;
  color: var(--muted);
  font-size: 11px;
}

.source-panel .remote-source {
  min-height: 170px;
  padding: 18px;
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.source-panel .remote-source > label,
.source-panel .remote-source > .field-label {
  margin-bottom: 6px;
  display: block;
  color: #486059;
  font-size: 11px;
  font-weight: 750;
}

.source-panel .divider {
  height: 26px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #9aa9a4;
  font-size: 10px;
}

.source-panel .button,
.source-panel .input-row input,
.source-panel .input-row select,
.source-panel .preset-trigger {
  min-height: 38px;
  height: 38px;
}

/*
 * 宽屏第一行只保留文件信息和常用操作；工作表标签下移到第二行状态栏。
 * 这样 Sheet 数量变化不会挤压视图切换与搜索框，整体结构也更接近表格软件。
 */
.viewer-toolbar {
  width: 100%;
  min-height: 52px;
  padding: 5px 12px;
  flex: 0 0 52px;
  display: grid;
  grid-template-columns: minmax(190px, 1fr) max-content;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.viewer-toolbar .file-summary > div {
  min-width: 0;
}

.viewer-toolbar .file-summary strong {
  max-width: min(48vw, 520px);
}

.viewer-toolbar .toolbar-actions {
  min-width: 0;
  gap: 8px;
}

/* 中等宽度仍采用单行，只适度压缩文件信息和搜索框。 */
@media (max-width: 1100px) {
  .viewer-toolbar {
    grid-template-columns: minmax(150px, 1fr) max-content;
    gap: 8px;
  }

  .viewer-toolbar .file-summary strong {
    max-width: 34vw;
  }

  .viewer-toolbar .search-box {
    width: 240px;
    min-width: 180px;
  }

  .status-line {
    gap: 8px;
  }

  .status-line .status-feedback {
    max-width: 48vw;
  }
}

@media (max-width: 820px) {
  .source-panel {
    width: calc(100vw - 20px);
    max-height: calc(100% - 20px);
    padding: 18px;
  }

  .source-panel .panel-heading {
    margin-bottom: 14px;
  }

  .source-panel .format-badge {
    display: none;
  }

  .source-panel .source-grid {
    min-width: 0;
    grid-template-columns: 1fr;
  }

  .source-panel .drop-zone {
    min-height: 104px;
    padding: 16px;
  }

  .source-panel .remote-source {
    min-height: 0;
  }

  /*
   * 手机端第一行只放文件信息和“更换文件”；复制、视图切换、搜索位于第二行。
   * 四列中的第三列负责吸收剩余宽度，使超长文件名能够稳定显示省略号。
   * toolbar-actions 使用 display: contents，让四个子控件能直接参与父级网格布局。
   */
  .viewer-toolbar {
    min-height: 80px;
    padding: 4px 8px;
    flex-basis: 80px;
    display: grid;
    grid-template-columns: max-content max-content minmax(0, 1fr) max-content;
    grid-template-rows: 34px 34px;
    align-items: center;
    gap: 4px 8px;
    overflow: hidden;
  }

  .viewer-toolbar .file-summary {
    min-width: 0;
    gap: 8px;
    grid-column: 1 / -1;
    grid-row: 1;
  }

  .viewer-toolbar .file-summary strong {
    max-width: 100%;
    font-size: 12px;
  }

  .viewer-toolbar .file-summary span:not(.file-icon) {
    display: none;
  }

  .viewer-toolbar .toolbar-actions {
    display: contents;
  }

  .viewer-toolbar .copy-toggle {
    grid-column: 2;
    grid-row: 2;
    justify-self: start;
  }

  .viewer-toolbar .source-toggle {
    grid-column: 1;
    grid-row: 2;
    justify-self: start;
  }

  .viewer-toolbar .search-box {
    width: 100%;
    min-width: 0;
    grid-column: 3 / 5;
    grid-row: 2;
  }

  /* 移动端分两行，工作表标签独占首行，状态信息位于第二行。 */
  .status-line {
    min-height: 68px;
    padding: 0;
    flex-basis: 68px;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: 39px 29px;
    gap: 0;
  }

  .status-line .sheet-label {
    display: none;
  }

  .status-line .sheet-bar > .segmented {
    margin-left: 8px;
  }

  /* 覆盖早先移动端给 sheet-bar 自身添加的左右内边距。 */
  .status-line .sheet-bar {
    width: 100%;
    padding: 0;
    gap: 8px;
    grid-column: 1 / -1;
  }

  .status-line .sheet-tabs {
    width: 100%;
    padding: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }

  .status-line .sheet-tabs::-webkit-scrollbar {
    display: none;
  }

  .status-line .sheet-tab {
    padding: 0 10px;
  }

  .status-line .status-feedback {
    width: 100%;
    max-width: none;
    padding: 0 8px;
    height: 100%;
    justify-content: flex-start;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

}

@media (max-width: 430px) {
  .source-panel {
    padding: 15px;
    border-radius: 16px;
  }

  .source-panel .panel-heading h1 {
    font-size: 22px;
  }

  .source-panel .panel-heading p:not(.eyebrow) {
    font-size: 12px;
  }

  .source-panel .source-grid {
    gap: 12px;
  }

  .source-panel .drop-zone {
    min-height: 96px;
    padding: 12px;
  }

  .viewer-toolbar {
    grid-template-columns: max-content max-content minmax(0, 1fr) max-content;
  }

  .viewer-toolbar .file-icon {
    width: 28px;
    height: 28px;
  }

  .viewer-toolbar .source-toggle {
    padding: 0 8px;
  }

  .viewer-toolbar .copy-toggle {
    padding: 0 8px;
  }

  .sheet-bar .segmented button {
    padding: 0 8px;
    font-size: 11px;
  }

  .viewer-toolbar .search-box {
    padding: 0 8px;
  }

  .viewer-toolbar .search-box > span[aria-hidden="true"] {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}