:root {
  --bg: #eef3f8;
  --panel: rgba(255, 255, 255, 0.92);
  --canvas: #fefefe;
  --ink: #14213d;
  --muted: #5f6b7a;
  --line: #d5deea;
  --accent: #0f766e;
  --accent-dark: #0b4f4a;
  --danger: #b8324b;
  --shadow: 0 18px 40px rgba(20, 33, 61, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(239, 125, 87, 0.14), transparent 25%),
    linear-gradient(180deg, #f7fafc 0%, #e8eef5 100%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1440px, calc(100vw - 24px));
  margin: 0 auto;
  padding: 16px 0 24px;
}

.topbar,
.panel,
.canvas-toolbar,
.canvas-stage {
  background: var(--panel);
  border: 1px solid rgba(213, 222, 234, 0.95);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 18px 22px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.7rem, 3vw, 2.8rem);
}

h2 {
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.topbar-actions,
.stack-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.dimension-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(248, 251, 253, 0.96);
}

.dimension-controls.hidden {
  display: none;
}

.dimension-field.hidden {
  display: none;
}

.dimension-label {
  font-weight: 700;
  color: var(--accent-dark);
}

.dimension-field {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-weight: 700;
}

.dimension-field input {
  width: 88px;
  min-height: 38px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}

.selection-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.selection-actions.hidden {
  display: none;
}

.action-group {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(248, 251, 253, 0.96);
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button {
  width: 40px;
  min-width: 40px;
  min-height: 40px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.icon-button:hover {
  border-color: rgba(15, 118, 110, 0.4);
}

.icon-button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 16px;
  margin-top: 16px;
  align-items: start;
}

.panel {
  padding: 18px;
}

.panel-block + .panel-block {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.button,
.tool-button {
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.button:hover,
.tool-button:hover {
  transform: translateY(-1px);
  border-color: rgba(15, 118, 110, 0.4);
}

.button {
  background: #f8fbfd;
}

.button.full-width {
  width: 100%;
}

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

.canvas-panel {
  min-width: 0;
}

.canvas-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  padding: 14px 18px;
  margin-bottom: 14px;
}

#status-text,
.hint,
#selection-summary {
  color: var(--muted);
  line-height: 1.5;
}

#status-text.hidden {
  display: none;
}

.zoom-badge {
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.08);
  color: var(--accent-dark);
  font-weight: 700;
  white-space: nowrap;
}

.canvas-stage {
  position: relative;
  padding: 16px;
  min-height: 620px;
}

.floating-palette {
  position: absolute;
  top: 30px;
  left: 28px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 10px;
  border: 1px solid rgba(213, 222, 234, 0.95);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 32px rgba(20, 33, 61, 0.12);
}

.tool-button {
  width: 54px;
  min-height: 54px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.tool-button svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool-button.active {
  border-color: rgba(15, 118, 110, 0.9);
  background: rgba(15, 118, 110, 0.1);
  color: var(--accent-dark);
}

#drawing-surface {
  display: block;
  width: 100%;
  height: auto;
  background: var(--canvas);
  border-radius: 18px;
  border: 1px solid #d7e0ea;
  touch-action: none;
  user-select: none;
}

#drawing-surface.is-zooming {
  cursor: zoom-in;
}

#drawing-surface.is-zooming.zoom-out-ready {
  cursor: zoom-out;
}

#shape-layer > * {
  cursor: pointer;
}

#shape-layer > *.selected {
  filter: drop-shadow(0 0 0.35rem rgba(15, 118, 110, 0.35));
}

.selection-box {
  fill: rgba(77, 124, 254, 0.06);
  stroke: rgba(77, 124, 254, 0.9);
  stroke-width: 1.5;
  stroke-dasharray: 8 6;
}

.rotation-stem {
  stroke: rgba(77, 124, 254, 0.9);
  stroke-width: 2;
}

.rotation-handle {
  fill: #4d7cfe;
  stroke: #fff;
  stroke-width: 3;
  pointer-events: all;
  cursor: grab;
}

.rotation-handle:active {
  cursor: grabbing;
}

.resize-handle {
  fill: #ffffff;
  stroke: #4d7cfe;
  stroke-width: 3;
  pointer-events: all;
  cursor: nwse-resize;
}

.resize-handle[data-handle="tr"],
.resize-handle[data-handle="bl"] {
  cursor: nesw-resize;
}

.radius-handle {
  fill: #ef7d57;
  stroke: #ffffff;
  stroke-width: 3;
  pointer-events: all;
  cursor: pointer;
}

.field,
.toggle {
  display: block;
  margin-bottom: 14px;
}

.field span {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.field strong {
  display: inline-block;
  margin-top: 6px;
  color: var(--accent-dark);
}

input[type="range"],
input[type="color"],
select {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--accent);
}

input[type="color"],
select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 4px 8px;
}

.toggle {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fbfdff;
}

.toggle input {
  accent-color: var(--accent);
}

@media (max-width: 1040px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100vw - 12px, 1440px);
    padding-top: 8px;
  }

  .topbar,
  .canvas-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .dimension-controls {
    flex-wrap: wrap;
  }

  .canvas-stage {
    padding: 12px;
    min-height: 420px;
  }

  .floating-palette {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    width: fit-content;
    margin-bottom: 12px;
  }
}