/* Page layout, buttons and form fields. One monospace font for every text, thin borders, no shadows. */

/* ---------- Reset and page ---------- */

* {
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

body {
  background: var(--bg);
  color: var(--ink);
  font: 13.5px/1.55 var(--font);
  padding-block: 16px 24px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

button,
input,
select,
textarea {
  font-family: inherit;
}

.app {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

sub {
  font-size: 0.72em;
  line-height: 0;
  vertical-align: -0.28em;
}

/* ---------- Header ---------- */

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  align-items: flex-end;
  justify-content: space-between;
}

.brand {
  min-width: 0;
}

h1 {
  margin: 0;
  font: 700 22px/1.2 var(--font);
  color: var(--accent);
  text-wrap: balance;
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
}

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

/* ---------- Buttons ---------- */

.btn {
  font: inherit;
  color: var(--ink);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  border-color: var(--sel);
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn.sm {
  padding: 2px 8px;
  font-size: 12.5px;
}

.btn[aria-pressed="true"] {
  background: var(--sel-soft);
  border-color: var(--sel);
  color: var(--sel);
}

.btn.primary {
  background: var(--sel);
  border-color: var(--sel);
  color: var(--on-sel);
  font-weight: 700;
}

.btn.danger {
  color: var(--bad);
}

.btn.danger:hover:not(:disabled) {
  border-color: var(--bad);
}

.btn:focus-visible,
.cell:focus-visible,
.slot:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.link:focus-visible {
  outline: 2px solid var(--sel);
  outline-offset: 1px;
}

/* ---------- Keys and form fields ---------- */

kbd {
  font: inherit;
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0 4px;
}

select,
input[type=text],
textarea {
  font: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 8px;
}

select {
  cursor: pointer;
}

/* ---------- Diagram board and side panel ---------- */

.work {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 14px;
  align-items: start;
}

.board {
  position: relative;
  height: clamp(400px, 60vh, 680px);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
  background: var(--canvas);
}

#svg {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.board[data-tool="state"] #svg {
  cursor: crosshair;
}

.board[data-tool="edge"] #svg {
  cursor: alias;
}

.board[data-tool="pan"] #svg,
.board.shift-pan #svg {
  cursor: grab;
}

#svg.panning,
#svg.panning * {
  cursor: grabbing !important;
}

.marquee {
  fill: var(--sel);
  fill-opacity: 0.1;
  stroke: var(--sel);
  stroke-width: 1;
  stroke-dasharray: 4 3;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}

/* ---------- Toolbar and hint over the diagram ---------- */

.toolbar {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  pointer-events: none;
  z-index: 2;
}

.toolbar .grp {
  pointer-events: auto;
  display: flex;
  gap: 2px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 2px;
}

.toolbar .btn {
  background: transparent;
  border-color: transparent;
  padding: 3px 9px;
}

.toolbar .btn[aria-pressed="true"] {
  background: var(--sel-soft);
  border-color: var(--sel);
}

.toolbar .btn:hover:not(:disabled) {
  border-color: var(--line);
}

.hint {
  position: absolute;
  left: 14px;
  bottom: 10px;
  right: 14px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
  text-wrap: balance;
}

/* ---------- Footer ---------- */

.foot {
  text-align: center;
  font-size: 11.5px;
  color: var(--muted);
}

.foot a {
  color: inherit;
}