:root {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --border: #e3e6ee;
  --text: #1c2333;
  --text-soft: #5b6478;
  --primary: #2a5dff;
  --primary-hover: #1d49d6;
  --success: #137a3b;
  --danger: #c5292a;
  --warning: #b06b00;
  --shadow: 0 1px 2px rgba(28, 35, 51, 0.04), 0 4px 16px rgba(28, 35, 51, 0.06);
  --radius: 10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.topbar {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.topbar h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.topbar .nav {
  margin-left: auto;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.topbar .nav a {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-weight: 500;
}
.topbar .nav a:hover { background: var(--bg); text-decoration: none; }
.topbar .nav a.active { background: var(--primary); color: #fff; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }

.card h2 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 600;
}
.card h3 {
  margin: 16px 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.grid {
  display: grid;
  gap: 16px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .container { padding: 16px 12px 48px; }
  .topbar { flex-wrap: wrap; }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}
.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.field input[type="text"],
.field input[type="number"],
.field input[type="color"],
.field select,
.field textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color .12s, box-shadow .12s;
}
.field input[type="color"] {
  padding: 2px;
  height: 36px;
  width: 60px;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(42, 93, 255, 0.15);
}
.field textarea {
  min-height: 120px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.5;
}
.field .hint {
  font-size: 12px;
  color: var(--text-soft);
}

.row-inline {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  padding: 6px 0;
}
.checkbox input { width: 16px; height: 16px; margin: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background .12s, border-color .12s, transform .04s;
}
.btn:hover { background: var(--bg); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger {
  background: #fff;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-soft); }
.btn-ghost:hover { background: var(--bg); }
.btn-sm { padding: 4px 8px; font-size: 12px; }

.toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}
.toolbar .spacer { flex: 1; }

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: #eef1f9;
  color: var(--text-soft);
}
.tag-ok { background: #e1f5e8; color: var(--success); }
.tag-off { background: #fde9e7; color: var(--danger); }

table.list {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
table.list th, table.list td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
table.list th {
  font-weight: 600;
  color: var(--text-soft);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.04em;
}
table.list tbody tr:hover { background: var(--bg); }

.empty {
  padding: 40px;
  text-align: center;
  color: var(--text-soft);
}

.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 13.5px;
}
.alert-info { background: #e7efff; color: #1a3a8a; border: 1px solid #c8d8ff; }
.alert-error { background: #fde9e7; color: var(--danger); border: 1px solid #f3c5c1; }
.alert-success { background: #e1f5e8; color: var(--success); border: 1px solid #b9e5c8; }

.kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fafbfd;
}

.url-output {
  word-break: break-all;
  font-family: ui-monospace, monospace;
  font-size: 12px;
  background: #f7f8fb;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--text-soft);
}

.preview-frame {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  height: 520px;
}

.color-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,.1);
  vertical-align: middle;
  margin-right: 6px;
}

.section-card {
  background: #fafbfd;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-bottom: 12px;
}
.section-card legend {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 8px;
}

.list-editor .row-item {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}
.list-editor .row-item input { flex: 1; }