:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #1d2430;
  --muted: #667085;
  --line: #d9dde3;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --canvas-bg: #e6e8ec;
  --ok: #15803d;
  --warn: #b45309;
  --bad: #b91c1c;
  color-scheme: light dark;
}

/* Dark theme: from the system setting unless the page switch says light, or by the switch */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171c;
    --panel: #1c2027;
    --text: #e6e9ee;
    --muted: #98a2b3;
    --line: #2f3540;
    --accent: #4f8cff;
    --canvas-bg: #0e1014;
    --ok: #4ade80;
    --warn: #fbbf24;
    --bad: #f87171;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14171c;
  --panel: #1c2027;
  --text: #e6e9ee;
  --muted: #98a2b3;
  --line: #2f3540;
  --accent: #4f8cff;
  --canvas-bg: #0e1014;
  --ok: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  color-scheme: dark;
}
:root[data-theme="light"] { color-scheme: light; }

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

h1 { margin: 0; font-size: 26px; }
h1 .tag { font-size: 15px; color: var(--accent); vertical-align: super; }
.sub { margin: 0; color: var(--muted); flex: 1; }
h1 a { color: inherit; text-decoration: none; }
h1 a:hover { color: var(--accent); }
a { color: var(--accent); }
.credits { padding-top: 13px; color: var(--muted); font-size: 14px; }
.credits p { margin: 0 0 6px; }
.status { color: var(--muted); font-size: 14px; }
.header-actions { display: flex; align-items: center; gap: 8px; align-self: center; }
.help-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px 5px 6px;
  border: 1px solid var(--accent);
  border-radius: 16px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  cursor: pointer;
}
.help-btn .q {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-text);
  color: var(--accent);
  font-size: 14px;
}
.help-btn:hover { filter: brightness(1.1); }
.theme-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.theme-btn:hover { border-color: var(--accent); }
.status.error { color: var(--bad); }

main {
  flex: 1;
  display: grid;
  grid-template-columns: 330px 1fr;
  min-height: 0;
}

aside {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 8px 16px 16px;
  overflow-y: auto;
}

aside section { padding: 8px 0; border-bottom: 1px solid var(--line); }
aside section:last-child { border-bottom: 0; }
h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 4px 0 8px; }

.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 16px;
  border: 2px dashed var(--line);
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
}
.drop.over { border-color: var(--accent); }
.drop input { display: none; }
.drop span { color: var(--muted); }
.drop .file-name { color: var(--text); word-break: break-all; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 6px 0;
}
.row > span:first-child { color: var(--muted); }
.row input[type=number] { width: 84px; }
.row input[type=text] { width: 130px; }
.combo { display: inline-flex; align-items: center; gap: 4px; }
.row > label:first-child { color: var(--muted); }
/* Unit shown inside the number box, after the value */
.unit-input { position: relative; display: inline-flex; }
.row .unit-input input[type=number] { width: 84px; padding-right: 18px; text-align: right; }
.unit-input > span {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
/* Number spinners would cover the unit */
.unit-input input[type=number] { -moz-appearance: textfield; appearance: textfield; }
.unit-input input::-webkit-inner-spin-button,
.unit-input input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.slider { width: 100%; margin: 0 0 6px; accent-color: var(--accent); }
.combo input[type=text] { width: 80px; }
.check { display: flex; align-items: center; gap: 6px; margin: 6px 0; }

input, select, button { font: inherit; color: inherit; }
input[type=number], input[type=text], select {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 3px 6px;
}

button.primary {
  width: 100%;
  margin-top: 10px;
  padding: 10px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button.primary:disabled { opacity: .5; cursor: default; }

#viewer {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  padding: 12px 16px;
  gap: 8px;
}

.toolbar { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.tabs, .zoom { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.zoom span { min-width: 52px; text-align: center; color: var(--muted); font-size: 14px; }
.tabs button, .zoom button {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
  padding: 4px 12px;
  cursor: pointer;
}
.tabs button.active, .zoom button.active { border-color: var(--accent); color: var(--accent); }
.tabs button:disabled, .zoom button:disabled { opacity: .4; cursor: default; }

.result { min-height: 20px; }
.result .angle { font-size: 22px; font-weight: 600; }
.result .ok { color: var(--ok); }
.result .warn { color: var(--warn); }
.result .bad { color: var(--bad); }
.result .muted { color: var(--muted); }

.canvas-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  background: var(--canvas-bg);
  border-radius: 8px;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
}
.canvas-wrap.dragging { cursor: grabbing; }
canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.icon-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
  font-weight: 600;
  line-height: 1;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

dialog {
  width: min(680px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.4); }
.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--panel);
}
.dialog-head h2 { margin: 0; font-size: 20px; text-transform: none; letter-spacing: 0; color: var(--text); }
.dialog-body { padding: 4px 16px 16px; }
.dialog-body h3 { font-size: 16px; margin: 16px 0 6px; }
.dialog-body ol, .dialog-body ul { padding-left: 20px; margin: 0; }
.dialog-body li { margin: 4px 0; }
.formats { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 0; }
.formats dt { color: var(--muted); }
.formats dd { margin: 0; }
.dialog-body pre {
  font-size: 13px;
  white-space: pre-wrap;
  background: var(--bg);
  border-radius: 6px;
  padding: 8px;
}
code { font-size: 14px; }
.busy {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
}

.log pre {
  max-height: 200px;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
  font-size: 13px;
  white-space: pre-wrap;
}

details summary {
  font-size: 110%;
  cursor: pointer;
}

@media (max-width: 760px) {
  body { height: auto; min-height: 100vh; }
  main { grid-template-columns: 1fr; }
  aside { border-right: 0; border-bottom: 1px solid var(--line); }
  .canvas-wrap { flex: none; height: 70vh; }
}