:root {
  --accent: #244cec;
  --accent-light: #eef1ff;
  --bg: #eceef1;
  --panel: #ffffff;
  --border: #e4e6eb;
  --text: #16181d;
  --text-dim: #74788a;
  --radius: 10px;
  --sidebar-w: 250px;
  --props-w: 260px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

/* ===== Top bar ===== */
.topbar {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 14px; }
.logo { font-weight: 800; font-size: 20px; letter-spacing: -0.5px; }
.logo span { color: var(--accent); }
.crumbs { color: var(--text-dim); font-size: 14px; display: flex; align-items: center; gap: 6px; }
.crumbs b { color: var(--text); }
.status-pill {
  display: flex; align-items: center; gap: 6px;
  background: var(--accent-light); color: var(--accent);
  border-radius: 20px; padding: 5px 12px; font-size: 13px; font-weight: 600;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--panel); display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.zoom-select {
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; background: var(--panel); font-size: 13px;
}
.btn {
  border: 1px solid var(--border); background: var(--panel); border-radius: 8px;
  padding: 8px 16px; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; border-color: transparent; }

/* ===== Layout ===== */
.app-body { display: flex; height: calc(100vh - 60px); }
.sidebar {
  width: var(--sidebar-w); background: var(--panel); border-right: 1px solid var(--border);
  overflow-y: auto; flex-shrink: 0;
}
.sidebar-tabs { display: flex; gap: 8px; padding: 16px; }
.sidebar-tabs button {
  flex: 1; border: 1px solid var(--border); background: var(--bg); border-radius: 8px;
  padding: 8px 0; font-size: 13px; font-weight: 600; color: var(--text-dim);
}
.sidebar-tabs button.active { background: var(--panel); border-color: var(--accent); color: var(--accent); }

.tool-group { border-top: 1px solid var(--border); }
.tool-group summary {
  list-style: none; cursor: pointer; padding: 14px 16px; font-weight: 700; font-size: 14px;
  display: flex; justify-content: space-between; align-items: center;
}
.tool-group summary::-webkit-details-marker { display: none; }
.tool-group summary::after { content: "+"; color: var(--text-dim); font-weight: 400; font-size: 18px; }
.tool-group[open] summary::after { content: "–"; }
.tool-body { padding: 0 16px 16px; display: flex; flex-direction: column; gap: 10px; }
.tool-body input[type=text], .tool-body input[type=file], .tool-body input[type=password], .tool-body textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 9px 10px; font-size: 13px;
}
.tool-body textarea { resize: vertical; min-height: 60px; }
.tool-row { display: flex; gap: 8px; }
.tool-row > * { flex: 1; }
.tool-btn {
  border: 1px solid var(--border); background: var(--bg); border-radius: 8px; padding: 9px; font-size: 13px; font-weight: 600;
}
.tool-btn.accent { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== Canvas / workspace ===== */
.workspace {
  flex: 1; overflow: auto; display: flex; flex-direction: column; align-items: center; padding: 30px 10px;
  position: relative;
}
#dropzone {
  width: min(720px, 90vw); border: 2px dashed var(--border); border-radius: var(--radius);
  background: var(--panel); padding: 60px 30px; text-align: center; color: var(--text-dim);
}
#dropzone.dragover { border-color: var(--accent); background: var(--accent-light); }
#dropzone h3 { color: var(--text); margin-top: 0; }

.page-stack { display: flex; flex-direction: column; align-items: center; gap: 24px; }
.pdf-page-wrap {
  position: relative; background: #fff; box-shadow: 0 4px 24px rgba(0,0,0,.08); border-radius: 4px;
}
.pdf-page-wrap canvas { display: block; border-radius: 4px; }
.overlay-layer { position: absolute; top: 0; left: 0; right: 0; bottom: 0; }
.text-box, .note-box {
  position: absolute; min-width: 40px; min-height: 20px; padding: 4px 6px; border: 1px dashed transparent;
  cursor: move; outline: none; background: transparent;
}
.text-box:hover, .text-box:focus, .note-box:hover { border-color: var(--accent); }
.note-box { background: #fff6b0; border-radius: 4px; box-shadow: 0 2px 6px rgba(0,0,0,.15); font-size: 12px; padding: 8px; }
.code-box {
  font-family: "Menlo","Consolas",monospace; background: #1e1f26; color: #d6e3ff; border-radius: 6px; padding: 10px; font-size: 12px;
}
.sig-box img { max-width: 220px; }
.floating-toolbar {
  position: fixed; z-index: 200; background: #1c1e26; border-radius: 8px; padding: 6px;
  display: none; align-items: center; gap: 2px; max-width: 92vw; overflow-x: auto;
}
.floating-toolbar button { background: transparent; border: none; color: #fff; padding: 6px 8px; border-radius: 6px; font-size: 13px; flex-shrink: 0; }
.floating-toolbar button:hover { background: rgba(255,255,255,.15); }
.floating-toolbar button.active { background: var(--accent); }
.floating-toolbar .toolbar-sep { width: 1px; height: 20px; background: rgba(255,255,255,.15); flex-shrink: 0; margin: 0 2px; }
.floating-toolbar select {
  background: #2a2c37; color: #fff; border: none; border-radius: 6px; font-size: 12px; padding: 5px 6px; flex-shrink: 0;
}
.toolbar-color {
  display: flex; align-items: center; gap: 2px; padding: 4px 6px; border-radius: 6px; cursor: pointer; flex-shrink: 0;
}
.toolbar-color:hover { background: rgba(255,255,255,.15); }
.toolbar-color input[type=color] {
  width: 18px; height: 18px; border: none; padding: 0; background: none; cursor: pointer;
}

/* Click-to-edit hitboxes over original PDF text */
.text-hit-layer { position: absolute; inset: 0; pointer-events: none; }
.text-hit { position: absolute; cursor: pointer; border-radius: 2px; }
.text-hit-layer.active .text-hit:hover { background: rgba(36,76,236,.18); outline: 1px dashed var(--accent); }
.whiteout-box { position: absolute; background: #fff; cursor: move; }

/* Align buttons */
.align-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== Right properties panel ===== */
.side-mini {
  width: 56px; background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; align-items: center; padding-top: 16px; gap: 10px; flex-shrink: 0;
}
.side-mini button {
  width: 36px; height: 36px; border: 1px solid var(--border); border-radius: 10px; background: var(--panel);
}
.props-panel {
  width: var(--props-w); background: var(--panel); border-left: 1px solid var(--border);
  padding: 20px 16px; overflow-y: auto; flex-shrink: 0;
}
.props-panel h4 { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-dim); margin: 18px 0 8px; }
.props-panel h4:first-child { margin-top: 0; }
.props-field { margin-bottom: 10px; }
.props-field label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.props-field input, .props-field select {
  width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 13px;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.swatch-row { display: flex; align-items: center; gap: 8px; }
.swatch { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--border); }

/* ===== Auth modal ===== */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15,17,23,.5); display: none; align-items: center; justify-content: center; z-index: 500;
}
.modal-backdrop.show { display: flex; }
.modal {
  background: #fff; border-radius: 14px; padding: 28px; width: 340px; max-width: 90vw;
}
.modal h3 { margin-top: 0; }
.modal input { width: 100%; border: 1px solid var(--border); border-radius: 8px; padding: 10px; margin-bottom: 10px; font-size: 14px; }
.modal .btn { width: 100%; justify-content: center; }
.modal-switch { font-size: 13px; text-align: center; margin-top: 10px; color: var(--text-dim); }
.modal-switch a { color: var(--accent); cursor: pointer; }
.modal-error { color: #c62828; font-size: 13px; margin-bottom: 8px; display: none; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #1c1e26; color: #fff; padding: 10px 18px; border-radius: 8px; font-size: 13px; z-index: 999; display: none;
}

/* ===== File manager ===== */
.file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px,1fr)); gap: 14px; padding: 16px; }
.file-card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 12px; text-align: center; }
.file-card .file-icon { font-size: 28px; margin-bottom: 6px; }
.file-card .file-name { font-size: 12px; word-break: break-word; }
.file-card .file-actions { display: flex; justify-content: center; gap: 6px; margin-top: 8px; }
.file-card .file-actions button { border: none; background: var(--bg); border-radius: 6px; padding: 4px 8px; font-size: 11px; }

/* ===== Mobile ===== */
@media (max-width: 900px) {
  :root { --sidebar-w: 220px; }
  .props-panel { display: none; }
  .side-mini { display: none; }
}
@media (max-width: 700px) {
  .topbar { padding: 0 10px; gap: 8px; }
  .crumbs { display: none; }
  .app-body { flex-direction: column; height: auto; }
  .sidebar {
    width: 100%; height: auto; max-height: 40vh; order: 2; border-right: none; border-top: 1px solid var(--border);
  }
  .workspace { order: 1; padding: 14px 6px; }
  .btn span.label { display: none; }
  .status-pill span.label { display: none; }
}
@media (max-width: 480px) {
  .logo { font-size: 16px; }
  .btn { padding: 8px 10px; }
}