* {
  box-sizing: border-box;
}

:root {
  --bg: #f3f5f9;
  --panel: #ffffff;
  --line: #d8dfeb;
  --text: #172033;
  --muted: #5d6b82;
  --fill: #eaf2ff;
  --stroke: #111827;
  --blue: #2563eb;
  --green: #16a34a;
  --purple: #7c3aed;
  --orange: #f59e0b;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 100vh;
}

.panel {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 18px;
  overflow: auto;
}

h1 {
  margin: 0 0 16px;
  font-size: 1.35rem;
}

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

.section:first-of-type {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.subhead {
  margin: 10px 0 6px;
  font-size: 0.86rem;
  color: var(--muted);
}

select,
input,
button {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid #c9d4e5;
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

button {
  cursor: pointer;
}

button:hover {
  background: #f8fbff;
}

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

.primary:hover {
  filter: brightness(.97);
}

.actions {
  display: grid;
  gap: 10px;
}

.check {
  display: grid;
  grid-template-columns: 18px 1fr;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
  font-size: 0.95rem;
}

.check input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--blue);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 6px;
}

.stage {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

svg {
  width: min(100%, 1000px);
  height: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
}

.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .app {
    grid-template-columns: 1fr;
  }

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

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}