:root {
  --main: #3949ab;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f1f1f;
  --muted: #666;
  --border: #e5e7eb;
  --success: #2e7d32;
  --error: #c62828;
}

:root.dark {
  --bg: #111827;
  --card: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #374151;
  --main: #7c83ff;
  --success: #7fd28a;
  --error: #f28b82;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Helvetica", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.logo {
  font-weight: 700;
  color: var(--main);
  margin-right: 8px;
}

.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  flex: 1;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 120px;
}

.control-group.search input { min-width: 180px; }

.control-group.buttons {
  flex-direction: row;
  align-items: flex-end;
  gap: 8px;
}

label { font-size: 12px; color: var(--muted); }

select, input[type="search"], button {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  outline: none;
  transition: all 0.15s ease;
}
select:focus, input:focus { border-color: var(--main); }
button {
  cursor: pointer;
  background: var(--main);
  color: #fff;
  border: none;
}
button:hover { filter: brightness(1.05); }
button:active { transform: translateY(1px); }
button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
button.ghost:hover { border-color: var(--main); color: var(--main); }

.layout {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 16px 24px;
  display: grid;
  grid-template-columns: 2.2fr 0.9fr;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
}

.main-card { max-width: 920px; margin: 0 auto; }
.meta-line { color: var(--muted); font-size: 13px; margin-bottom: 8px; }

.question-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.breadcrumbs { color: var(--muted); font-size: 14px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.divider { opacity: 0.6; }

.question-text { font-size: 18px; line-height: 1.6; margin: 12px 0; }

.options { display: flex; flex-direction: column; gap: 8px; margin: 12px 0; }
.option {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.option:hover { border-color: var(--main); }
.option input { margin-top: 3px; }

.short-box textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 10px;
  background: var(--card);
  color: var(--text);
}

.result {
  margin: 12px 0;
  padding: 10px 12px;
  border-radius: 8px;
  font-weight: 600;
}
.result.ok { background: rgba(46,125,50,0.12); color: var(--success); border: 1px solid rgba(46,125,50,0.3); }
.result.bad { background: rgba(198,40,40,0.12); color: var(--error); border: 1px solid rgba(198,40,40,0.3); }

.analysis, .short-ref {
  border-left: 3px solid var(--main);
  padding-left: 10px;
  margin: 8px 0 12px;
  color: var(--muted);
  white-space: pre-wrap;
}

.nav-row, .settings-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.nav-row button { flex: 1 1 160px; }
.settings-row { align-items: center; color: var(--muted); font-size: 14px; }

.stats-card h3 { margin: 0 0 8px; }
.stat-line {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: 4px 0;
  color: var(--muted);
}
.stat-line strong { color: var(--text); }

.hide { display: none !important; }

@media (max-width: 640px) {
  .layout { grid-template-columns: 1fr; }
  .topbar { position: sticky; top: 0; }
  .nav-row button { flex: 1 1 120px; }
}