:root {
  --primary: #0b5fa5;
  --primary-dark: #084a80;
  --primary-light: #e8f1fa;
  --green: #1a7f4b;
  --green-light: #e6f4ec;
  --red: #c0392b;
  --yellow-light: #fdf6e3;
  --bg: #f4f6f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1f2937;
  --muted: #64748b;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

.topbar {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 18px 32px;
}
.topbar h1 { font-size: 20px; font-weight: 700; letter-spacing: 0.5px; }
.topbar p { font-size: 12px; opacity: 0.85; margin-top: 4px; }

.navbar {
  display: flex;
  gap: 4px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 20;
}
.nav-item {
  border: none;
  background: none;
  padding: 12px 18px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: color 0.15s;
}
.nav-item:hover { color: var(--primary); }
.nav-item.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.container { max-width: 1280px; margin: 0 auto; padding: 24px; }

.page { display: none; }
.page.active { display: block; }

h2 { font-size: 20px; margin-bottom: 4px; color: var(--primary-dark); }
.page-desc { color: var(--muted); margin-bottom: 14px; }

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

/* ---------- stats ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.stat-grid.small { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow);
}
.stat-card .num { font-size: 22px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- toolbar ---------- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.spacer { flex: 1; }
.pager-info { color: var(--muted); font-size: 13px; }

input[type="text"], input[type="number"], select, textarea {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  background: #fff;
  color: var(--text);
  outline: none;
}
input[type="text"]:focus, select:focus, textarea:focus { border-color: var(--primary); }
textarea { width: 100%; min-height: 160px; resize: vertical; font-family: inherit; }

.btn-primary, .btn-secondary {
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #eef2f7; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #e2e8f0; }

.hidden { display: none !important; }
.empty { color: var(--muted); text-align: center; padding: 24px; }

/* ---------- QA list ---------- */
.qa-list { display: flex; flex-direction: column; gap: 10px; }
.qa-item { border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); box-shadow: var(--shadow); }
.qa-head { display: flex; gap: 10px; padding: 12px 14px; cursor: pointer; align-items: flex-start; }
.qa-id { background: var(--primary-light); color: var(--primary-dark); border-radius: 4px; padding: 2px 8px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.qa-q { flex: 1; font-weight: 600; }
.qa-tags { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
.tag { background: var(--green-light); color: var(--green); font-size: 11px; padding: 1px 8px; border-radius: 10px; }
.qa-answer { padding: 12px 14px; border-top: 1px dashed var(--border); color: #374151; background: #fafcfe; }

/* ---------- generate layout ---------- */
.gen-layout { display: grid; grid-template-columns: 320px 1fr; gap: 16px; align-items: start; }
.gen-config h3 { font-size: 14px; color: var(--primary-dark); margin: 14px 0 8px; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.gen-config h3:first-child { margin-top: 0; }
.gen-config label { display: block; font-size: 12px; color: var(--muted); margin: 8px 0 4px; }
.gen-config select, .gen-config input[type="number"] { width: 100%; }
.gen-config input[type="number"] { max-width: 160px; }
.radio-row { display: flex; gap: 14px; flex-wrap: wrap; }
.radio-row label { display: inline-flex; align-items: center; gap: 4px; color: var(--text); font-size: 13px; margin: 0; }
.cat-check label { display: flex; align-items: center; gap: 6px; color: var(--text); font-size: 13px; }
.hint { font-size: 11px; color: var(--muted); margin-top: 6px; }
.src-panel { border: 1px dashed var(--border); border-radius: 6px; padding: 10px; background: #fafcfe; }
.gen-btn { width: 100%; padding: 12px; font-size: 15px; margin-top: 14px; }
.gen-status { margin-top: 10px; font-size: 13px; color: var(--muted); }

.gen-main { min-width: 0; }
.placeholder { text-align: center; color: var(--muted); padding: 60px 20px; }
.gen-result-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.gen-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* word cloud */
.word-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  padding: 18px;
}
.cloud-word { color: var(--primary); font-weight: 600; cursor: default; }

/* category result */
.cat-section { margin-bottom: 16px; }
.cat-title { font-size: 16px; color: var(--primary-dark); margin-bottom: 8px; }
.cat-title .badge { font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 8px; }
.cat-title .sum { font-size: 12px; font-weight: 400; color: var(--green); margin-left: 8px; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; white-space: nowrap; }
tbody tr:hover { background: #f8fafc; }
.term-table th, .term-table td { font-size: 12.5px; }
.example-cell { color: var(--muted); max-width: 260px; font-size: 12px; }
.note-cell { color: var(--muted); font-size: 12px; }
.num-cell { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- cases ---------- */
.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.case-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; cursor: pointer; box-shadow: var(--shadow); transition: transform 0.12s, box-shadow 0.12s; }
.case-card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(15, 23, 42, 0.12); }
.case-kind { display: inline-block; font-size: 11px; background: var(--primary-light); color: var(--primary-dark); padding: 1px 8px; border-radius: 10px; margin-bottom: 8px; }
.case-type { font-size: 11px; color: var(--muted); margin-left: 6px; }
.case-card h3 { font-size: 15px; color: var(--primary-dark); margin-bottom: 8px; }
.case-focus { font-size: 12.5px; color: #374151; }
.case-detail .bg-box { background: #fafcfe; border: 1px solid var(--border); border-radius: 6px; padding: 12px; white-space: pre-wrap; margin: 8px 0; max-height: 320px; overflow: auto; }

.detail-group h4 { font-size: 13px; color: var(--primary-dark); margin: 10px 0 6px; }
.detail-box { background: #fafcfe; border: 1px solid var(--border); border-radius: 6px; padding: 10px; }
.detail-box.highlight-green { background: var(--green-light); }
.detail-box.highlight-yellow { background: var(--yellow-light); }

/* ---------- koujing ---------- */
.koujing-layout { display: grid; grid-template-columns: 240px 1fr; gap: 16px; align-items: start; }
.koujing-side h3 { font-size: 14px; color: var(--primary-dark); margin-bottom: 10px; }
.koujing-nav { list-style: none; }
.koujing-nav li { padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; }
.koujing-nav li:hover { background: var(--primary-light); }
.koujing-nav li.active { background: var(--primary); color: #fff; }
.koujing-nav li .stage { display: block; font-size: 11px; color: var(--muted); }
.koujing-nav li.active .stage { color: rgba(255,255,255,0.85); }

/* ---------- simple list ---------- */
.simple-list { list-style: none; }
.simple-list li { padding: 8px 0; border-bottom: 1px dashed var(--border); }

/* ---------- about ---------- */
.about-block h3 { font-size: 15px; color: var(--primary-dark); margin-bottom: 10px; }
.about-block p { margin-bottom: 8px; }
.flow { display: flex; flex-direction: column; gap: 8px; }
.flow-item { display: flex; gap: 12px; align-items: center; background: #fafcfe; border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; }
.flow-item strong { min-width: 130px; color: var(--primary-dark); }

/* ---------- footer ---------- */
.footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 20px 16px;
  border-top: 1px solid var(--border);
  background: var(--card);
  margin-top: 16px;
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  background: #111827;
  color: #fff;
  padding: 10px 20px;
  border-radius: 6px;
  z-index: 99;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}