body {
  margin: 0;
  padding: 24px;
  font-family: system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1.6;
  color: #1f2933;
  background: #f7f9fb;
}

.notice {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 12px;
  border-radius: 999px;
  background: #e3f2fd;
  color: #14539a;
  font-size: 14px;
  font-weight: 600;
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.subtitle {
  margin: 0 0 24px;
  color: #52606d;
}

#app {
  padding: 24px;
  border: 1px solid #d8e0e8;
  border-radius: 12px;
  background: #ffffff;
}

.empty {
  margin: 0;
  color: #7b8794;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

input[type="date"] {
  width: 100%;
  max-width: 320px;
  padding: 10px 12px;
  border: 1px solid #cbd2d9;
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
}

button {
  padding: 10px 20px;
  border: 0;
  border-radius: 8px;
  background: #14539a;
  color: #ffffff;
  font-size: 16px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
}

.result {
  margin: 20px 0 0;
  font-size: 24px;
  font-weight: 700;
}

.status-safe {
  color: #0b6b4f;
  border-left: 8px solid #10b981;
  padding-left: 12px;
}

.status-warning {
  color: #8a5a00;
  border-left: 8px solid #f5b700;
  padding-left: 12px;
}

.status-urgent {
  color: #a3231a;
  border-left: 8px solid #e5484d;
  padding-left: 12px;
}

.status-expired {
  color: #52606d;
  border-left: 8px solid #9aa5b1;
  padding-left: 12px;
}

input[type="text"] {
  width: 100%;
  max-width: 320px;
  padding: 10px 12px;
  border: 1px solid #cbd2d9;
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
}

.item-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.item-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
  padding: 14px 16px;
  border: 1px solid #d8e0e8;
  border-radius: 10px;
  background: #ffffff;
}

.item-name {
  flex: 1 1 160px;
  font-weight: 700;
}

.item-dday {
  min-width: 96px;
  font-weight: 700;
}

.item-status {
  min-width: 56px;
  font-weight: 700;
}

.item-delete {
  padding: 6px 14px;
  background: #ffffff;
  border: 1px solid #cbd2d9;
  color: #52606d;
  font-size: 14px;
}

.board-header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
}

.board-header h1 {
  margin: 0;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.summary-card {
  padding: 16px;
  border: 1px solid #d8e0e8;
  border-radius: 12px;
  background: #ffffff;
}

.summary-card strong {
  display: block;
  margin-top: 6px;
  font-size: 28px;
}

.summary-label {
  font-size: 14px;
  font-weight: 600;
}

/* starter의 #app 규칙보다 우선해야 하므로 id와 class를 함께 쓴다. */
#app.board-body {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
  padding: 0;
  border: 0;
  background: transparent;
}

.input-panel,
.list-panel {
  padding: 20px;
  border: 1px solid #d8e0e8;
  border-radius: 12px;
  background: #ffffff;
}

.input-panel h2,
.list-panel h2 {
  margin: 0 0 16px;
  font-size: 20px;
}

@media (max-width: 720px) {
  .summary {
    grid-template-columns: repeat(2, 1fr);
  }

  #app.board-body {
    grid-template-columns: 1fr;
  }
}