:root {
  --bg: #F6F8FB;
  --panel: #FFFFFF;
  --border: #E5EAF2;
  --border-strong: #D3DCE9;
  --text: #1E293B;
  --text-2: #5B6B80;
  --text-3: #94A3B8;
  --accent: #2563EB;
  --accent-strong: #1D4ED8;
  --accent-weak: #EBF1FF;
  --danger: #DC2626;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(15, 23, 42, .10), 0 2px 6px rgba(15, 23, 42, .06);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .08);
  --font: ui-sans-serif, system-ui, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --canvas-font: ui-sans-serif, system-ui, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  user-select: none;
  -webkit-user-select: none;
}

body { display: flex; flex-direction: column; }

.spacer { flex: 1; }
.vsep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.hidden { display: none !important; }

kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: #F8FAFC;
  font-family: var(--font);
  font-size: 11.5px;
  color: var(--text-2);
}

/* ---------- 顶栏 ---------- */
#topbar {
  height: 52px;
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 9px; min-width: 0; }

.brand-logo {
  width: 26px; height: 26px;
  flex: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #3B82F6, #2547C9);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.25), 0 2px 6px rgba(37,99,235,.35);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Ccircle cx='16' cy='9' r='3.2' fill='%23fff'/%3E%3Ccircle cx='9' cy='23' r='3.2' fill='%23fff'/%3E%3Ccircle cx='23' cy='23' r='3.2' fill='%23fff'/%3E%3Cpath d='M16 12.4V16M9 19.8V16h14' stroke='%23fff' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-size: cover;
}

.title-input {
  border: 1px solid transparent;
  background: transparent;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  padding: 5px 8px;
  border-radius: 7px;
  width: 150px;
  outline: none;
  user-select: text;
  -webkit-user-select: text;
}
.title-input:hover { background: #F1F5F9; }
.title-input:focus { border-color: var(--accent); background: var(--panel); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }

.btn-group { display: flex; align-items: center; gap: 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background .12s, border-color .12s, box-shadow .12s;
}
.btn:hover { background: #F6F9FE; border-color: var(--border-strong); }
.btn:active { background: #EEF3FB; }
.btn:disabled { opacity: .4; cursor: default; pointer-events: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-strong); }
.btn.danger { color: var(--danger); border-color: #F3CACA; }
.btn.danger:hover { background: #FEF2F2; }
.btn svg { width: 16px; height: 16px; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: background .12s, color .12s;
}
.icon-btn:hover { background: #F1F5F9; color: var(--text); }
.icon-btn:disabled { opacity: .35; cursor: default; pointer-events: none; }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn.toggled { background: var(--accent-weak); color: var(--accent); }

/* 分段控件 */
.seg {
  display: inline-flex;
  align-items: center;
  background: #EEF2F8;
  border-radius: 9px;
  padding: 2.5px;
  gap: 2px;
}
.seg button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 27px;
  padding: 0 12px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all .12s;
}
.seg button:hover { color: var(--text); }
.seg button.active {
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}
.seg button svg { width: 15px; height: 15px; }

/* 下拉菜单 */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 208px;
  padding: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  z-index: 100;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}
.dropdown-item:hover { background: #F2F6FD; }
.dropdown-item.danger { color: var(--danger); }
.dropdown-item.danger:hover { background: #FEF2F2; }
.dropdown-item svg { width: 16px; height: 16px; color: var(--text-2); flex: none; }
.dropdown-item.danger svg { color: var(--danger); }
.dropdown-item .dd-desc { margin-left: auto; font-size: 11px; color: var(--text-3); font-weight: 400; }
.dropdown-sep { height: 1px; background: var(--border); margin: 5px 8px; }

/* ---------- 主区域 ---------- */
#main { flex: 1; display: flex; min-height: 0; }

#toolRail {
  width: 54px;
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  background: var(--panel);
  border-right: 1px solid var(--border);
}
.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border: none;
  border-radius: 11px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  position: relative;
  transition: all .12s;
}
.tool-btn:hover { background: #F1F5F9; color: var(--text); }
.tool-btn.active { background: var(--accent-weak); color: var(--accent); }
.tool-btn svg { width: 20px; height: 20px; }
.tool-btn .tool-key {
  position: absolute;
  right: 3px; bottom: 2px;
  font-size: 8.5px;
  font-weight: 700;
  color: var(--text-3);
}
.tool-btn.active .tool-key { color: var(--accent); opacity: .7; }
.rail-sep { width: 26px; height: 1px; background: var(--border); margin: 2px 0; }

#canvasWrap { flex: 1; position: relative; min-width: 0; background: var(--bg); }
#canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
#canvas text { user-select: none; -webkit-user-select: none; }

#canvas[data-tool="select"] { cursor: default; }
#canvas[data-tool="node"], #canvas[data-tool="edge"] { cursor: crosshair; }
#canvas[data-tool="text"] { cursor: text; }
#canvas[data-tool="hand"], #canvas.panning { cursor: grab; }
#canvas.panning-active { cursor: grabbing !important; }

#editorLayer { position: absolute; inset: 0; pointer-events: none; z-index: 10; }
#editorLayer > * { pointer-events: auto; }

.label-input, .note-input {
  position: absolute;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font-family: var(--canvas-font);
  font-weight: 600;
  text-align: center;
  outline: none;
  box-shadow: 0 4px 16px rgba(37,99,235,.18);
  padding: 0;
  user-select: text;
  -webkit-user-select: text;
}
.note-input {
  text-align: left;
  font-weight: 400;
  line-height: 1.45;
  resize: none;
  overflow: hidden;
  padding: 4px 6px;
}

#emptyHint {
  position: absolute;
  left: 50%; top: 44%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
  color: var(--text-3);
}
#emptyHint .empty-title { font-size: 15px; font-weight: 600; color: var(--text-2); margin-bottom: 10px; }
#emptyHint .empty-sub { font-size: 12.5px; }

/* ---------- 右侧检查器 ---------- */
#inspector {
  width: 272px;
  flex: none;
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
#inspector::-webkit-scrollbar { width: 8px; }
#inspector::-webkit-scrollbar-thumb { background: #DDE4EE; border-radius: 4px; }

.panel-section { display: flex; flex-direction: column; gap: 10px; }
.panel-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text-2);
}
.panel-title .count-badge {
  background: var(--accent-weak);
  color: var(--accent);
  font-size: 10.5px;
  padding: 1px 7px;
  border-radius: 99px;
}
.panel-hr { height: 1px; background: var(--border); margin: -4px 0; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 12px; color: var(--text-2); font-weight: 500; }

.text-input {
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 10px;
  font-family: var(--font);
  font-size: 13px;
  color: var(--text);
  background: #FBFCFE;
  outline: none;
  width: 100%;
  user-select: text;
  -webkit-user-select: text;
  transition: border-color .12s, box-shadow .12s;
}
.text-input:focus { border-color: var(--accent); background: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.text-input::placeholder { color: var(--text-3); }

.inspector-seg { display: flex; background: #EEF2F8; border-radius: 8px; padding: 2.5px; gap: 2px; }
.inspector-seg button {
  flex: 1;
  height: 27px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all .12s;
}
.inspector-seg button:hover { color: var(--text); }
.inspector-seg button.active { background: #fff; color: var(--text); font-weight: 600; box-shadow: var(--shadow-sm); }

.swatches { display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; }
.swatch {
  width: 24px; height: 24px;
  border-radius: 7px;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: transform .1s;
  position: relative;
}
.swatch:hover { transform: scale(1.12); }
.swatch.active { box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--accent); }

.align-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.align-btn {
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: #FBFCFE;
  color: var(--text-2);
  font-family: var(--font);
  font-size: 11.5px;
  cursor: pointer;
  transition: all .12s;
}
.align-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-weak); }

.range-row { display: flex; align-items: center; gap: 10px; }
.range-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
.range-val { font-size: 11.5px; color: var(--text-2); width: 34px; text-align: right; font-variant-numeric: tabular-nums; }

.switch-row { display: flex; align-items: center; justify-content: space-between; }
.switch-row .field-label { margin: 0; }
.switch { position: relative; width: 36px; height: 21px; flex: none; cursor: pointer; }
.switch input { display: none; }
.switch .track {
  position: absolute; inset: 0;
  background: #D6DEEA;
  border-radius: 99px;
  transition: background .15s;
}
.switch .thumb {
  position: absolute;
  top: 2.5px; left: 2.5px;
  width: 16px; height: 16px;
  background: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  transition: transform .15s;
}
.switch input:checked + .track { background: var(--accent); }
.switch input:checked + .track + .thumb { transform: translateX(15px); }

.tips-list { display: flex; flex-direction: column; gap: 8px; font-size: 12.5px; color: var(--text-2); line-height: 1.5; }
.tips-list b { color: var(--text); font-weight: 600; }

/* ---------- 状态栏 ---------- */
#statusbar {
  height: 34px;
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-2);
}
#zoomCtrl .zoom-label {
  min-width: 48px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--text-2);
  font-size: 12px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 6px;
  height: 26px;
}
#zoomCtrl .zoom-label:hover { background: #F1F5F9; color: var(--text); }

/* ---------- 弹窗 / 提示 ---------- */
#toastWrap {
  position: fixed;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 300;
  pointer-events: none;
}
.toast {
  background: rgba(15, 23, 42, .92);
  color: #F1F5F9;
  font-size: 13px;
  padding: 9px 18px;
  border-radius: 99px;
  box-shadow: var(--shadow);
  animation: toastIn .22s ease-out;
  backdrop-filter: blur(6px);
}
.toast.out { animation: toastOut .25s ease-in forwards; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } }
@keyframes toastOut { to { opacity: 0; transform: translateY(6px); } }

#modalBackdrop {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, .34);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
}
.modal {
  background: var(--panel);
  border-radius: 16px;
  box-shadow: var(--shadow);
  width: 520px;
  max-width: calc(100vw - 40px);
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  animation: toastIn .18s ease-out;
}
.modal-sm { width: 340px; }
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 10px;
  font-size: 15px;
  font-weight: 700;
}
.modal-body { padding: 8px 20px 20px; }
.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 28px; }
.help-group { padding: 8px 0; }
.help-group h4 { font-size: 12px; color: var(--text-3); font-weight: 700; margin: 8px 0 8px; letter-spacing: .05em; }
.help-row { display: flex; align-items: center; justify-content: space-between; padding: 4.5px 0; font-size: 12.5px; color: var(--text-2); }
.help-row .keys { display: flex; gap: 4px; }
.confirm-body { padding: 24px; }
.confirm-text { font-size: 13.5px; color: var(--text); line-height: 1.6; user-select: text; -webkit-user-select: text; }
.confirm-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }

/* 图库 */
.library-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  min-height: 120px;
}
.library-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  cursor: pointer;
  transition: border-color .12s, box-shadow .12s, transform .12s;
  background: #FBFCFE;
}
.library-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(37, 99, 235, .12);
  transform: translateY(-1px);
}
.library-card.current { border-color: var(--accent); }
.library-card.current::after {
  content: '当前';
  position: absolute;
  top: -8px; right: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 99px;
}
.library-thumb {
  height: 104px;
  border-radius: 8px;
  background: #F1F5F9;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.library-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.thumb-placeholder {
  color: var(--text-3);
  opacity: .6;
}
.thumb-placeholder svg { width: 30px; height: 30px; }
.library-title {
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.library-meta { margin-top: 2px; font-size: 11px; color: var(--text-3); }
.library-del {
  position: absolute;
  top: 12px; right: 12px;
  width: 26px; height: 26px;
  background: rgba(255, 255, 255, .92);
  opacity: 0;
  transition: opacity .12s;
}
.library-del svg { width: 15px; height: 15px; }
.library-card:hover .library-del { opacity: 1; }
.library-del:hover { color: var(--danger); background: #fff; }
.library-empty { text-align: center; padding: 28px 0 20px; }
.library-empty .empty-title { font-size: 14px; font-weight: 600; color: var(--text-2); margin-bottom: 8px; }
.library-empty .empty-sub { font-size: 12px; color: var(--text-3); }
.library-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-3);
}

/* 生成表单 */
.form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.form-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
#formBody input[type="number"] { -moz-appearance: textfield; }
#formBody input::-webkit-outer-spin-button,
#formBody input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

@media (max-width: 1380px) {
  #modeSeg button span { display: none; }
  #modeSeg button { padding: 0 10px; }
}
@media (max-width: 1150px) {
  .title-input { width: 90px; }
  #libraryBtns .btn span { display: none; }
  #libraryBtns .btn { padding: 0 9px; }
}

/* ---------- SVG 元素 ---------- */
#canvas .node .shape { transition: stroke-width .1s; }
#canvas g[data-type="node"]:hover .shape { stroke-width: 2.6; }
#canvas g[data-type="node"] { cursor: move; }
#canvas g[data-type="edge"] .edge-body { cursor: pointer; }
#canvas g[data-type="edge"] .edge-label { cursor: move; }
#canvas g[data-type="note"] { cursor: move; }

#canvas .sel-ring { animation: dashSpin 1.2s linear infinite paused; }
#canvas .sel-ring.animated { animation-play-state: running; }
@keyframes dashSpin { to { stroke-dashoffset: -24; } }

@media (max-width: 900px) {
  #inspector { display: none; }
}