:root {
  --bg: #eef1f4;
  --panel: #ffffff;
  --panel-soft: #f7f9fb;
  --ink: #15202b;
  --muted: #667085;
  --line: #d8dee8;
  --red: #e84d2a;
  --red-dark: #be351d;
  --blue: #2076a8;
  --green: #058b70;
  --dark: #22272d;
  --dark-2: #30363d;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #edf2f5, #dfe6ec);
}
.login-card {
  width: min(380px, calc(100vw - 32px));
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 26px;
  box-shadow: 0 20px 50px rgba(20, 32, 43, 0.16);
}
.brand-mark, .brand-logo {
  display: grid;
  place-items: center;
  background: var(--red);
  color: white;
  font-weight: 900;
}
.brand-mark { width: 44px; height: 44px; font-size: 24px; }
.login-card h1 { margin: 16px 0 4px; font-size: 24px; }
.login-card p { margin: 0 0 20px; color: var(--muted); }
.login-card label { display: grid; gap: 7px; margin: 14px 0; font-size: 13px; font-weight: 700; }
.login-card input {
  height: 42px;
  border: 1px solid var(--line);
  padding: 0 12px;
  font-size: 15px;
}
.login-card button {
  width: 100%;
  min-height: 40px;
  margin-top: 10px;
  border: 1px solid var(--red);
  background: var(--red);
  color: white;
  cursor: pointer;
  font-weight: 800;
}
.login-error { background: #fff1f0; color: #a33222; padding: 9px 10px; border: 1px solid #ffc9c1; }

.app-shell {
  height: 100vh;
  display: grid;
  grid-template-columns: 330px 1fr;
  grid-template-rows: 46px 1fr;
  overflow: hidden;
}
.app-shell.sidebar-collapsed { grid-template-columns: 0 1fr; }
.app-topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 10px 0 14px;
  background: #fdfefe;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255,255,255,.8) inset;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-logo { width: 30px; height: 30px; border-radius: 8px; }
.brand strong { display: block; font-size: 16px; line-height: 1; }
.brand span { display: block; font-size: 11px; color: var(--muted); margin-top: 3px; }
.top-actions { display: flex; align-items: center; gap: 7px; }
.icon-btn, .logout-btn, .pdf-controls button {
  min-width: 34px;
  height: 34px;
  border: 1px solid #cfd7e3;
  background: #fff;
  color: #18212b;
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
  display: inline-grid;
  place-items: center;
}
.icon-btn:hover, .logout-btn:hover, .pdf-controls button:hover { background: #eef5f8; border-color: #9ec1d0; }
.logout-btn { padding: 0 12px; font-size: 13px; color: var(--red-dark); }

.sidebar {
  grid-row: 2;
  min-width: 0;
  background: #f4f7f9;
  border-right: 1px solid #cfd8e2;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.app-shell.sidebar-collapsed .sidebar { visibility: hidden; }
.side-head {
  padding: 11px 12px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}
.side-head strong { display: block; font-size: 15px; }
.side-head span { display: block; color: var(--red); font-size: 11px; font-weight: 800; margin-top: 2px; }
.search {
  width: calc(100% - 20px);
  height: 34px;
  margin: 10px;
  padding: 0 10px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 13px;
  outline: none;
}
.search:focus { border-color: #98bfd1; box-shadow: 0 0 0 2px rgba(32, 118, 168, .12); }
.side-stats { display: flex; gap: 6px; padding: 0 10px 8px; }
.side-stats span {
  background: #edf3f7;
  border: 1px solid var(--line);
  padding: 5px 7px;
  font-size: 11px;
  color: #344454;
}
.tree {
  overflow: auto;
  padding: 3px 6px 22px;
  flex: 1;
  font-size: 12px;
}
.tree ul { list-style: none; padding-left: 13px; margin: 0; }
.tree li { margin: 0; }
.tree-row {
  display: flex;
  align-items: center;
  gap: 5px;
  min-height: 23px;
  padding: 2px 5px;
  cursor: pointer;
  white-space: nowrap;
  color: #172534;
}
.tree-row:hover, .tree-row.active { background: #d9ecf6; color: #0b5572; }
.tree-icon {
  width: 26px;
  text-align: left;
  color: #718096;
  font-size: 11px;
  flex-shrink: 0;
}
.tree-label { overflow: hidden; text-overflow: ellipsis; }
.kind-dir .tree-icon { color: #f05a24; }
.kind-pdf .tree-icon { color: #c92717; font-weight: 900; }
.kind-pcbe .tree-icon, .kind-pcbe-json .tree-icon { color: var(--green); font-weight: 900; }
.kind-image .tree-icon { color: #6d56c8; font-weight: 900; }

.viewer {
  grid-row: 2;
  min-width: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  background: #e9eef2;
  overflow: hidden;
}
.tabs {
  min-height: 34px;
  display: flex;
  align-items: end;
  gap: 5px;
  padding: 5px 8px 0;
  background: #f6f8fa;
  border-bottom: 1px solid #d9e0e8;
  overflow-x: auto;
}
.tab {
  max-width: 280px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 9px;
  border: 1px solid #d8dee8;
  border-bottom: 0;
  background: #edf2f6;
  color: #435466;
  cursor: pointer;
  font-size: 12px;
  flex-shrink: 0;
}
.tab.active { background: #fff; color: var(--red-dark); font-weight: 800; }
.tab-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tab-close { color: #9aa5b1; font-weight: 900; }
.toolbar {
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: #fff;
  padding: 0 14px;
  gap: 16px;
}
.file-title { min-width: 0; }
.file-title span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 74vw;
}
.file-title strong {
  display: block;
  font-size: 16px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 74vw;
}
.pdf-controls { display: flex; align-items: center; gap: 8px; font-size: 12px; color: #435466; }
.pdf-controls button { min-width: 30px; height: 28px; }
.hidden { display: none !important; }

.empty-state {
  flex: 1;
  display: grid;
  place-content: center;
  text-align: center;
  color: var(--muted);
}
.empty-state h2 { color: var(--ink); margin: 0 0 8px; }

.pdf-view, .image-view, .text-view {
  flex: 1;
  min-height: 0;
  overflow: auto;
}
.pdf-view {
  background: #2a2f34;
  padding: 22px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}
.pdf-stage {
  background: #fff;
  box-shadow: 0 16px 40px rgba(0,0,0,.35);
}
.pdf-stage canvas { display: block; }
.image-view {
  padding: 16px;
  background: #2a2f34;
  display: grid;
  place-items: center;
}
.image-view img {
  max-width: 100%;
  max-height: 100%;
  display: block;
  background: #fff;
  box-shadow: 0 14px 34px rgba(0,0,0,.28);
}
.text-view pre {
  min-height: 100%;
  overflow: auto;
  margin: 0;
  background: #111827;
  color: #e5e7eb;
  padding: 16px;
  font-size: 13px;
}

.pcbe-layout {
  flex: 1;
  min-height: 0;
  display: block;
}
.canvas-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #fbfcfd;
}
#pcbeCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}
#pcbeCanvas.dragging { cursor: grabbing; }
.canvas-tip {
  position: absolute;
  pointer-events: none;
  background: rgba(21, 32, 43, 0.94);
  color: white;
  padding: 7px 9px;
  font-size: 12px;
  max-width: 280px;
  z-index: 8;
}
.selection-info {
  background: rgba(255,255,255,.94);
  border: 1px solid #cfd8e2;
  padding: 9px 10px;
  font-size: 12px;
  line-height: 1.45;
}
.selection-info.floating {
  position: absolute;
  left: 12px;
  bottom: 12px;
  min-width: 260px;
  max-width: min(420px, calc(100% - 24px));
  box-shadow: 0 10px 26px rgba(20,32,43,.12);
}
.pcbe-menu {
  position: absolute;
  top: 88px;
  right: 12px;
  width: 320px;
  max-height: calc(100% - 104px);
  overflow: auto;
  z-index: 10;
  background: rgba(248,250,252,.98);
  border: 1px solid #cfd8e2;
  box-shadow: 0 18px 42px rgba(20,32,43,.2);
}
.pcbe-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 0 10px 10px;
}
.pcbe-grid label {
  background: #fff;
  border: 1px solid var(--line);
  padding: 7px;
  font-size: 12px;
}
.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  padding: 0 10px 10px;
}
.metrics div {
  background: #fff;
  border: 1px solid var(--line);
  padding: 8px;
}
.metrics strong { display: block; font-size: 18px; }
.metrics span { color: var(--muted); font-size: 11px; }
.result-list {
  margin: 0 10px 10px;
  display: grid;
  gap: 5px;
}
.result-item {
  border: 1px solid var(--line);
  background: #fff;
  padding: 7px 8px;
  font-size: 12px;
  cursor: pointer;
}
.result-item:hover { border-color: var(--blue); color: var(--blue); }

@media (max-width: 900px) {
  .app-shell { grid-template-columns: minmax(250px, 42vw) 1fr; }
  .brand span { display: none; }
  .sidebar { position: absolute; top: 46px; bottom: 0; left: 0; width: min(86vw, 330px); z-index: 20; box-shadow: 8px 0 28px rgba(20,32,43,.2); }
  .app-shell.sidebar-collapsed .sidebar { transform: translateX(-105%); visibility: visible; }
  .viewer { grid-column: 1 / -1; }
  .pcbe-menu { left: 12px; right: 12px; width: auto; }
}