:root {
  --bg: #fafaf8;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --border: #d9d9de;
  --pane-bg: #ffffff;
  --input-bg: #ffffff;
  --accent: #2e7d32;
  --accent-fg: #ffffff;
  --danger: #c62828;
  --card-from: #eef6ee;
  --card-to: #dcecdc;
  --status-bg: #eef6ee;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --fg: #f2f2f5;
    --muted: #9b9ba1;
    --border: #3a3a3e;
    --pane-bg: #262628;
    --input-bg: #1c1c1e;
    --accent: #66bb6a;
    --accent-fg: #10240f;
    --danger: #ef5350;
    --card-from: #253425;
    --card-to: #1b271b;
    --status-bg: #253425;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Segoe UI", "Malgun Gothic", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

h1 {
  font-size: 20px;
  margin: 0;
}

h2 {
  font-size: 16px;
  margin: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--pane-bg);
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

button {
  font: inherit;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--pane-bg);
  color: var(--fg);
  cursor: pointer;
}

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

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

button.danger {
  color: var(--danger);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

.status {
  margin: 12px 24px 0;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--status-bg);
  border: 1px solid var(--border);
}

.status.error {
  border-color: var(--danger);
  color: var(--danger);
}

.layout {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px;
  flex-wrap: wrap;
}

.pane {
  background: var(--pane-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.list-pane {
  flex: 1 1 260px;
  min-width: 260px;
}

.edit-pane {
  flex: 2 1 340px;
  min-width: 320px;
}

.preview-pane {
  flex: 0 0 auto;
}

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.pane-head-actions {
  display: flex;
  gap: 6px;
}

.ad-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ad-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.ad-list li.selected {
  border-color: var(--accent);
  outline: 1px solid var(--accent);
}

.ad-list li.inactive {
  opacity: 0.5;
}

.ad-list .ad-name {
  font-weight: 600;
}

.ad-list .ad-meta {
  font-size: 13px;
  color: var(--muted);
}

.hint {
  font-size: 13px;
  color: var(--muted);
  margin: 12px 0 0;
}

#adForm {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* display: flex가 hidden 속성(UA의 display: none)을 이기므로 명시적으로 복원 */
#adForm[hidden] {
  display: none;
}

#adForm label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#adForm label > span {
  font-weight: 600;
  font-size: 14px;
}

#adForm em {
  font-style: normal;
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
}

#adForm input[type="text"],
#adForm input[type="url"],
#adForm input[type="number"],
#adForm input[type="date"],
#adForm select {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--fg);
}

#adForm input[readonly] {
  color: var(--muted);
  background: var(--pane-bg);
}

#adForm label.check {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

#adForm label.check > span {
  font-weight: 600;
  font-size: 14px;
}

.date-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.date-row label {
  flex: 1 1 140px;
}

.ad-card {
  width: 250px;
  height: 250px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  padding: 20px;
  background: linear-gradient(160deg, var(--card-from), var(--card-to));
}

.ad-card.has-image {
  padding: 0;
  background-size: cover;
  background-position: center;
}

.ad-card.empty {
  color: var(--muted);
  font-size: 13px;
}

.ad-card .ad-card-title {
  font-size: 18px;
  font-weight: 700;
}

.ad-card .ad-card-subtitle {
  font-size: 14px;
  color: var(--muted);
}

.ad-card .ad-card-cta {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}