:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --border: #d1d5db;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
}

.title {
  margin: 0 0 24px;
  font-size: 20px;
}

.stage {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.side {
  width: 480px;
}

.drop {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 8px;
  background: var(--panel);
  cursor: pointer;
  overflow: hidden;
}

.drop.is-dragover {
  border-color: var(--primary);
  background: #eff6ff;
}

.frame {
  display: block;
  width: 480px;
  height: 640px;
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  text-align: center;
  color: var(--muted);
  line-height: 1.8;
  pointer-events: none;
}

.drop-hint.is-hidden { display: none; }

.status {
  min-height: 1.5em;
  margin: 8px 0;
  color: var(--muted);
  font-size: 13px;
}

.status.is-error { color: #b91c1c; }

.side-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
}

.tip {
  width: 100%;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.guide {
  min-height: 1.6em;
  margin: 24px 0;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
}

.panel {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 12px 16px;
}

legend { font-size: 13px; color: var(--muted); }

fieldset label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  font-size: 13px;
}

fieldset label.check { gap: 4px; }

input[type="text"], input[type="date"] {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font: inherit;
}

output {
  min-width: 3.5em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
}

button {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  font: inherit;
  cursor: pointer;
}

button:hover { background: #f3f4f6; }

.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  padding: 10px 24px;
}

.primary:hover { background: #1d4ed8; }

.primary:disabled {
  background: #93c5fd;
  border-color: #93c5fd;
  cursor: default;
}

.actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.message {
  min-height: 1.5em;
  margin: 0;
  font-size: 13px;
  color: #b91c1c;
}

.message.is-done { color: #15803d; }