:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #1c1f26;
  --muted: #6b7280;
  --accent: #2f6fed;
  --accent-dark: #1d4fbf;
  --danger: #d64545;
  --success: #1f9d55;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.topnav a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}
.topnav a:hover { color: var(--accent); }
.topnav .brand { font-weight: 700; margin-right: auto; color: var(--accent); }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
}

h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 24px 0 10px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }

label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--muted); }
input[type=text], input[type=url], input[type=file], textarea, select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  margin-bottom: 12px;
  background: #fff;
}
textarea { min-height: 70px; resize: vertical; }
fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 12px; margin-bottom: 12px; }
legend { font-size: 13px; font-weight: 600; color: var(--muted); padding: 0 6px; }

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--accent-dark); }
.btn.secondary { background: #fff; color: var(--text); border-color: var(--border); }
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn.danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn.small { padding: 4px 10px; font-size: 12px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge.pending { background: #fff4d6; color: #8a6d00; }
.badge.approved { background: #dcf7e3; color: var(--success); }
.badge.rejected { background: #fde3e3; color: var(--danger); }
.badge.error { background: #fde3e3; color: var(--danger); }
.badge.pending_review { background: #e3ecfd; color: var(--accent-dark); }

.creative-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  margin-bottom: 16px;
}
.creative-card img { width: 160px; height: 160px; object-fit: cover; border-radius: 6px; background: #f0f0f0; }

.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}
.asset-tile {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
}
.asset-tile img { width: 100%; height: 160px; object-fit: cover; display: block; background: #f0f0f0; }
.asset-tile .meta { padding: 8px 10px; font-size: 12px; color: var(--muted); }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.flash.info { background: #e3ecfd; color: var(--accent-dark); }
.flash.error { background: #fde3e3; color: var(--danger); }
.flash.success { background: #dcf7e3; color: var(--success); }

.checkbox-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.checkbox-row input { width: auto; margin: 0; }

.muted { color: var(--muted); font-size: 13px; }
.repeat-row { display: grid; grid-template-columns: 1fr 1fr auto; gap: 8px; align-items: start; }
.filters { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.filters select, .filters input { margin-bottom: 0; width: auto; min-width: 160px; }

.release-list { display: flex; flex-direction: column; gap: 10px; }
.release-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 14px;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  text-decoration: none;
  color: var(--text);
}
.release-row:hover { border-color: var(--accent); }
.release-thumb { width: 72px; height: 72px; object-fit: cover; border-radius: 6px; background: #f0f0f0; }
.release-name { font-weight: 600; font-size: 15px; margin-bottom: 2px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tab-btn {
  padding: 10px 18px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.tab-btn .muted { margin-left: 4px; }

button:disabled, .btn:disabled { opacity: 0.6; cursor: not-allowed; }