:root {
  --bg: #14151f;
  --bg-panel: #1c1e2b;
  --bg-elevated: #262940;
  --border: #363a55;
  --text: #e7e8f5;
  --text-dim: #9a9cc0;
  --accent: #8b5cf6;
  --danger: #ef4444;
  --font-size: 15px;
  --radius: 10px;
}

:root[data-theme="light"] {
  --bg: #f2f2fa;
  --bg-panel: #ffffff;
  --bg-elevated: #eeeef8;
  --border: #d8d8ec;
  --text: #1c1d2b;
  --text-dim: #5c5e78;
}

:root[data-textsize="small"] { --font-size: 13px; }
:root[data-textsize="medium"] { --font-size: 15px; }
:root[data-textsize="large"] { --font-size: 18px; }

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: var(--font-size);
}

input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
  color: var(--text);
}

/* ---------- Auth page ---------- */
.auth-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.auth-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 340px;
}
.auth-card h1 { margin: 0 0 4px; font-size: 22px; }
.auth-sub { color: var(--text-dim); margin: 0 0 20px; }
.auth-card form { display: flex; flex-direction: column; gap: 12px; }
.auth-card label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--text-dim); }
.auth-card input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
}
.auth-card button {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  padding: 10px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  margin-top: 4px;
}
.auth-card hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.hint { color: var(--text-dim); font-size: 12px; }
.error-msg {
  margin-top: 12px;
  padding: 8px 10px;
  border-radius: 6px;
  background: rgba(239,68,68,0.15);
  color: #ff8a8a;
  font-size: 13px;
}

/* ---------- Board layout ---------- */
.board-body { margin: 0; height: 100vh; overflow: hidden; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}
.topbar h1 { font-size: 16px; margin: 0; margin-right: 8px; white-space: nowrap; }
.topbar select, .topbar button, .topbar input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}
.topbar .spacer { flex: 1; }
.icon-btn { display: flex; align-items: center; gap: 6px; }

.canvas-viewport {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 24px 24px;
  cursor: grab;
}
.canvas-viewport.panning { cursor: grabbing; }
.canvas-content {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
}
.lines-svg { position: absolute; top: 0; left: 0; overflow: visible; pointer-events: none; }
.lines-svg path { pointer-events: stroke; cursor: pointer; }

.card {
  position: absolute;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 160px;
  min-height: 90px;
}
.card.relation-card {
  border-style: dashed;
  min-width: 120px;
  min-height: 60px;
}
.card.connect-source { outline: 2px solid var(--accent); }
.card-header {
  padding: 8px 10px;
  font-weight: 600;
  cursor: move;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
}
.card-header .title-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-body {
  padding: 8px 10px;
  flex: 1;
  overflow: hidden;
  font-size: calc(var(--font-size) - 2px);
  color: var(--text-dim);
  cursor: pointer;
}
.card-resize-handle {
  position: absolute;
  right: 0; bottom: 0;
  width: 16px; height: 16px;
  cursor: nwse-resize;
}

.fab-menu {
  position: absolute;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 15;
}
.fab {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: min(680px, 92vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
}
.modal-header {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.modal-header input[type=text] {
  flex: 1; font-size: 17px; font-weight: 700;
  background: transparent; border: none; color: var(--text);
}
.modal-body { padding: 16px; overflow-y: auto; flex: 1; }
.modal-footer {
  padding: 12px 16px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 8px;
}
.close-btn { background: none; border: none; color: var(--text-dim); font-size: 20px; cursor: pointer; }

.lock-banner {
  background: rgba(234, 179, 8, 0.15);
  color: #f0c94a;
  padding: 8px 16px;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}
.lock-banner[hidden] { display: none; }

.btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 12px;
  cursor: pointer;
  color: var(--text);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: white; font-weight: 600; }
.btn.danger { background: rgba(239,68,68,0.15); border-color: var(--danger); color: #ff8a8a; }

.block {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}
.block-head {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 10px;
  background: var(--bg-elevated);
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.block-head .spacer { flex: 1; }
.block-head button { background: none; border: none; color: var(--text-dim); cursor: pointer; }
.block-content { padding: 10px; }
.block-content textarea, .block-content input[type=text] {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  resize: vertical;
}
.block-content textarea { min-height: 70px; font-family: inherit; }
.block-content.code textarea { font-family: "SFMono-Regular", Consolas, monospace; background: #0d0e16; color: #d7e0ff; }
.list-item { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.list-item input[type=text] { flex: 1; }
table.editable-table { width: 100%; border-collapse: collapse; }
table.editable-table td { border: 1px solid var(--border); padding: 4px; }
table.editable-table td[contenteditable] { min-width: 60px; outline: none; }
.tree-node { margin-left: 18px; border-left: 2px solid var(--border); padding-left: 10px; margin-top: 6px; }
.tree-node input[type=text] { width: calc(100% - 60px); }
.image-block img { max-width: 100%; border-radius: 6px; display: block; }
.add-block-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

.side-panel-body { padding: 4px; }
.field-row { margin-bottom: 14px; display: flex; flex-direction: column; gap: 6px; }
.field-row label { font-size: 13px; color: var(--text-dim); }
.vault-entry { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.vault-entry .label { font-weight: 600; flex: 1; }
.vault-entry .value { font-family: monospace; color: var(--text-dim); }