:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #315efb;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.topbar {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.topbar h1 { margin: 0 0 6px; font-size: 1.5rem; }
.topbar p { margin: 0; color: var(--muted); }

.how-to-use {
  margin: 18px 18px 0;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.how-to-use h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.how-to-use ol {
  margin: 0;
  padding-left: 20px;
}
.how-to-use li {
  margin: 4px 0;
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
  padding: 18px;
}

.sidebar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  height: fit-content;
}
.sidebar label { font-weight: 600; display: block; margin-bottom: 8px; }
.sidebar input {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.hint { color: var(--muted); font-size: 0.9rem; margin: 10px 0; }
.meta { color: var(--muted); font-size: 0.9rem; margin-top: 6px; }

.content { display: grid; gap: 14px; }
.lane-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}
.lane-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  padding: 12px;
  cursor: pointer;
}
.lane-card.active { border-color: var(--accent); box-shadow: 0 0 0 2px #315efb1a; }
.lane-card h3 { margin: 0 0 6px; font-size: 1rem; }
.lane-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.lane-detail {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}
.lane-detail.empty { color: var(--muted); }
.tool-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-top: 10px;
}
.tool-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.badge {
  font-size: 0.8rem;
  padding: 3px 8px;
  border-radius: 999px;
  background: #eef2ff;
  color: #24356d;
}
.kv { margin: 7px 0; }
.kv span { color: var(--muted); display: inline-block; min-width: 120px; }
.prompt-list { margin: 8px 0 0 0; padding-left: 18px; }
.prompt-row {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 8px;
}
.copy-btn {
  background: #eef2ff;
  color: #1e40af;
  border: 1px solid #c7d2fe;
  border-radius: 7px;
  padding: 4px 8px;
  cursor: pointer;
  white-space: nowrap;
}

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
}