/* layout: shared styles; retain order with the other component sheets. */
@layer components {
/* ---------- 4. 頂部列 ---------- */
.topbar {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;

  padding-top: calc(8px + env(safe-area-inset-top));
  padding-right: calc(16px + env(safe-area-inset-right));
  padding-left: calc(16px + env(safe-area-inset-left));
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-logo { display: block; width: 30px; height: 35px; object-fit: contain; flex-shrink: 0; }
.cloud-login-card h1 .brand-logo { width: 42px; height: 48.5px; margin-right: 12px; }
.phone-camera-brand { display: flex; align-items: center; gap: 10px; }

.brand-name {
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.topbar-actions {
  display: flex;
  
  align-items: center;
  flex-wrap: wrap;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon svg {
  width: 16px;
  height: 16px;
}

.more-btn {
  padding: 8px;
}

.topbar-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: calc(12px + env(safe-area-inset-right));
  z-index: 40;
  min-width: 200px;
  max-width: min(320px, calc(100vw - 24px));
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  padding: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.topbar-menu .btn {
  text-align: left;
  white-space: nowrap;
  justify-content: flex-start;
}

.topbar-menu .btn:hover {
  background: var(--panel-2);
}

.topbar-menu .sync-status {
  align-self: flex-start;
  padding: 2px 6px;
}

/* ---------- 5. 按鈕 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--on-ink);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 14px;
  
  line-height: 1.2;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.btn.ghost {
  background: transparent;
  color: var(--text);
  border-color: transparent;
}

.btn.ghost:hover:not(:disabled) {
  background: var(--panel-2);
}

.btn.ghost:active:not(:disabled) {
  background: var(--border);
}

.btn.small {
  padding: 6px 12px;
  font-size: 13px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.link-btn {
  border: none;
  background: none;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  font-size: 13px;
  padding: 2px 4px;
}

/* ---------- 6. 主版面：兩區平接、1px 分隔線 ---------- */
.layout {
  flex: 1;
  min-height: 0;
  display: flex;
}

.viewer-pane {
  flex: 0 0 60%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  position: relative;
}

.viewer-pane.dragging {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.chat-pane {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  overflow: hidden;
}

/* 分隔線：平常是 1px 髮絲線，hover／拖曳時變 accent */
.pane-splitter {
  
  --splitter-hot-x: 8px;
  --splitter-hot-y: 8px;
  flex: 0 0 var(--splitter-size);
  align-self: stretch;
  position: relative;
  z-index: 3;
  background: transparent;
  touch-action: none;
  outline: none;
}

.pane-splitter::before {
  content: '';
  position: absolute;
  top: calc(var(--splitter-hot-y) * -1);
  right: calc(var(--splitter-hot-x) * -1);
  bottom: calc(var(--splitter-hot-y) * -1);
  left: calc(var(--splitter-hot-x) * -1);
}

.pane-splitter::after {
  content: '';
  position: absolute;
  background: var(--border);
  transition: background var(--dur-fast) var(--ease);
}

.pane-splitter.vertical::after {
  
  
  left: 50%;
  
  transform: translateX(-50%);
}

.pane-splitter.horizontal::after {
  
  
  top: 50%;
  
  transform: translateY(-50%);
}

@media (hover: hover) {
  .pane-splitter:hover::after {
    background: var(--accent);
  }
}

.pane-splitter.dragging::after {
  background: var(--accent);
}

.pane-splitter.vertical {
  cursor: col-resize;
}

.pane-splitter.horizontal {
  cursor: row-resize;
}

body.resizing,
body.resizing * {
  user-select: none !important;
}

/* ---------- 7. PDF 工具列 ---------- */
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.file-name {
  font-weight: 600;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 40%;
}

.page-count {
  color: var(--muted);
}

.zoom {
  
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  
}

.zoom button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  
  
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  
  
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.zoom button:hover:not(:disabled) {
  background: var(--panel-2);
}

#zoom-label {
  min-width: 48px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

/* 框選區域提問：按鈕開啟狀態與拖曳中的草稿框（拖曳邏輯見 public/js/regionselect.js） */
.zoom button.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.viewer.region-mode {
  cursor: crosshair;
  /* 拖曳框選時不要讓瀏覽器捲動或選取文字（單指捲動暫時關掉，雙指縮放仍可用） */
  touch-action: none;
  user-select: none;
}

.viewer.region-mode .qbox,
.viewer.region-mode .qpart {
  cursor: crosshair;
}

.region-box {
  position: absolute;
  pointer-events: none;
  border: 1px dashed var(--accent);
  border-radius: 2px;
  background: var(--accent-soft);
}

/* ---------- 8. PDF 桌面與紙張 ---------- */
.viewer {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 16px;
  scroll-behavior: auto;
  touch-action: pan-x pan-y;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.viewer-pages {
  transform-origin: 0 0;
}

/* 空狀態：左上對齊的排版式說明，無外框 */
.drop-hint {
  min-height: 100%;
  
  display: flex;
  flex-direction: column;
  justify-content: center;
  
  
  color: var(--muted);
}

.drop-hint p {
  margin: 0;
  line-height: 1.8;
}

.drop-hint p:first-of-type {
  font-family: var(--font-ui);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 8px;
}

.drop-hint p.muted {
  font-size: 14px;
}

.page {
  position: relative;
  margin: 0 auto 16px;
  background: var(--page);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.page-canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 4px;
}

.page.loading .page-spinner {
  display: block;
}

.page-spinner {
  display: none;
  position: absolute;
  inset: 0;
  border-radius: 4px;
  background: var(--panel-2);
}

.page-marks,
.page-overlay {
  position: absolute;
  inset: 0;
}

.page-marks {
  pointer-events: none;
}

.page-overlay {
  pointer-events: none;
}

/* 題目與小題疊層：平常不畫框，hover／選中才出現淡底與內框 */
.qbox,
.qpart {
  --pad-t: 6px;
  --pad-r: 6px;
  --pad-b: 6px;
  --pad-l: 6px;
  position: absolute;
  pointer-events: auto;
  cursor: pointer;
}

.qbox::before,
.qpart::before {
  content: '';
  position: absolute;
  top: calc(var(--pad-t) * -1);
  right: calc(var(--pad-r) * -1);
  bottom: calc(var(--pad-b) * -1);
  left: calc(var(--pad-l) * -1);
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .qbox:hover::before {
    background: var(--accent-soft);
    border-color: var(--accent);
  }

  .qbox.part-hover::before {
    background: var(--accent-soft);
    border-color: transparent;
  }

  .qpart:hover::before {
    background: var(--accent-soft);
    border-color: var(--accent);
  }
}

.qbox.selected::before,
.qpart.selected::before {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.qbox.selected::after,
.qpart.selected::after {
  content: '';
  position: absolute;
  left: calc(var(--pad-l) * -1);
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
}

.qdot {
  position: absolute;
  left: var(--dot-left, -26px);
  top: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  pointer-events: none;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .qbox:hover .qdot {
    border-color: var(--accent);
    color: var(--accent);
  }
}

.qbox.selected .qdot {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-ink);
}

.qbox.part-selected .qdot {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.qtag {
  position: absolute;
  top: 2px;
  right: 4px;
  font-size: 10px;
  line-height: 1.5;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .qpart:hover .qtag {
    opacity: 1;
  }
}

.qpart.selected .qtag {
  opacity: 1;
}

@media (pointer: coarse) {
  .qtag {
    opacity: 1;
  }
}

.page-status {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: rgba(17, 24, 39, 0.86);
  color: #fff;
  font-size: 14px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  max-width: 80%;
  text-align: center;
}

.page-status.retry {
  cursor: pointer;
  background: var(--danger);
  color: var(--on-ink);
}

}