:root {
  color-scheme: light;
  --ink: #202124;
  --muted: #626d75;
  --paper: #ffffff;
  --panel: #f6f7f4;
  --line: #c8d0cb;
  --accent: #0f8f73;
  --accent-strong: #0a6f59;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #eef2ef;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  padding: 18px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 12px;
  max-width: 980px;
  margin: 0 auto 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 12px 28px rgba(24, 37, 35, 0.12);
}

.control {
  display: grid;
  gap: 6px;
}

.control label {
  color: var(--muted);
  font-size: 14px;
}

input[type="color"] {
  width: 62px;
  height: 42px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

select {
  min-width: 116px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 34px 0 12px;
  color: var(--ink);
  background: var(--paper);
}

button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 16px;
  color: var(--ink);
  background: #f9faf8;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button.primary {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

button.primary:hover {
  background: var(--accent-strong);
}

.workspace {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: auto;
  padding: 0 0 20px;
}

#cardCanvas {
  display: block;
  width: min(100%, 620px);
  height: auto;
  background: var(--paper);
  box-shadow: 0 20px 44px rgba(24, 37, 35, 0.22);
  cursor: pointer;
}

@media (max-width: 560px) {
  .app-shell {
    padding: 10px;
  }

  .toolbar {
    align-items: stretch;
    margin-bottom: 12px;
  }

  .control,
  button {
    flex: 1 1 138px;
  }
}