:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --line: #d7dee7;
  --text: #17202a;
  --muted: #627083;
  --blue: #1d67c1;
  --blue-dark: #154f96;
  --green: #0f8a5f;
  --red: #c63838;
  --amber: #c98518;
  --ink: #26313d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 76px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0;
}

.topbar p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.view-menu {
  position: relative;
}

.view-menu > summary {
  display: flex;
  align-items: center;
  min-height: 36px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: var(--panel);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.view-menu > summary::-webkit-details-marker {
  display: none;
}

.view-menu > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.view-menu > summary::after {
  content: "▾";
  margin-left: 7px;
  color: var(--muted);
  font-size: 11px;
}

.view-menu[open] > summary {
  border-color: #9eb2ca;
  background: #f9fbfd;
}

.view-menu-panel {
  position: absolute;
  z-index: 30;
  top: calc(100% + 6px);
  right: 0;
  width: 136px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
  box-shadow: 0 8px 22px rgba(23, 32, 42, 0.14);
}

.view-menu-option {
  width: 100%;
  min-height: 34px;
  padding: 0 9px;
  border-color: transparent;
  text-align: left;
}

.view-menu-option[aria-checked="true"] {
  border-color: #b8d2f0;
  background: #eaf3ff;
  color: var(--blue);
  font-weight: 700;
}

button {
  border: 1px solid var(--line);
  border-radius: 7px;
  min-height: 36px;
  padding: 0 13px;
  color: var(--ink);
  background: var(--panel);
  cursor: pointer;
}

button:hover {
  border-color: #9eb2ca;
  background: #f9fbfd;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button:disabled:hover {
  border-color: var(--line);
  background: var(--panel);
}

.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
  font-weight: 700;
}

.primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.danger {
  color: var(--red);
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 88px minmax(420px, 1fr) 330px;
  min-height: 0;
}

.toolbar {
  border-right: 1px solid var(--line);
  background: #fbfcfe;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tool {
  width: 68px;
  height: 62px;
  padding: 6px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 20px;
  line-height: 1;
}

.tool span {
  font-size: 12px;
  color: var(--muted);
}

.tool.active {
  border-color: var(--blue);
  background: #eaf3ff;
  color: var(--blue);
}

.tool.active span {
  color: var(--blue);
  font-weight: 700;
}

.canvas-wrap {
  position: relative;
  min-width: 0;
  overflow: hidden;
  background: #eef2f6;
}

canvas {
  display: block;
  background: #fff;
  width: 100%;
  height: 100%;
  min-height: 620px;
  cursor: crosshair;
  touch-action: none;
  user-select: none;
}

.hint {
  position: absolute;
  left: 16px;
  bottom: 16px;
  max-width: min(680px, calc(100% - 32px));
  padding: 9px 12px;
  border: 1px solid #cdd8e5;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}

.panel {
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 14px;
  overflow: auto;
}

.panel section + section {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 15px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 13px;
}

.field input,
.field select {
  width: 100%;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 6px 8px;
  background: #fff;
  color: var(--text);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.small-btns {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.small-btns button {
  flex: 1;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  margin: 0 4px 6px 0;
  border-radius: 999px;
  background: #edf2f7;
  color: #48586b;
  font-size: 12px;
}

.result-item {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  margin-bottom: 10px;
  background: #fbfcfe;
  font-size: 13px;
  line-height: 1.55;
}

.properties .result-item {
  margin-top: 2px;
}

.result-item strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}

.warn {
  color: #8a5200;
}

@media (max-width: 900px) {
  .topbar,
  .layout {
    display: block;
  }

  .top-actions {
    margin-top: 12px;
    justify-content: flex-start;
  }

  .view-menu-panel {
    right: auto;
    left: 0;
    width: min(136px, calc(100vw - 36px));
  }

  .view-menu {
    min-width: min(136px, calc(100vw - 36px));
  }

  .toolbar {
    flex-direction: row;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .panel {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  canvas {
    height: 560px;
  }
}