:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --paper: #ffffff;
  --ink: #172033;
  --muted: #687085;
  --line: #dfe4ee;
  --accent: #2867b2;
  --accent-2: #0f8b8d;
  --warn: #9a5b00;
  --good: #177245;
  --shadow: 0 10px 28px rgba(23, 32, 51, .08);
}

body.dark {
  color-scheme: dark;
  --bg: #111827;
  --paper: #182235;
  --ink: #edf2ff;
  --muted: #aeb8ce;
  --line: #2b3750;
  --accent: #7db1ff;
  --accent-2: #55d0c8;
  --shadow: 0 10px 28px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 28px;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.brand img { width: 54px; height: 54px; border-radius: 8px; object-fit: cover; border: 1px solid var(--line); }
h1, h2, h3, p { margin: 0; }
h1 { font-size: 20px; }
.brand p, .hero p { color: var(--muted); margin-top: 4px; }
.icon-btn, button, select, input { font: inherit; }
.icon-btn {
  width: 42px; height: 42px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink);
  cursor: pointer;
}

main { max-width: 1280px; margin: 0 auto; padding: 24px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: end;
  padding: 26px;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow);
  border-radius: 8px;
}
.eyebrow { color: var(--accent-2); font-weight: 700; font-size: 13px; margin-bottom: 8px; }
.hero h2 { font-size: 30px; line-height: 1.25; letter-spacing: 0; }
.stats { display: grid; grid-template-columns: repeat(3, 94px); gap: 10px; }
.stat { padding: 12px; border: 1px solid var(--line); border-radius: 8px; text-align: center; }
.stat strong { display: block; font-size: 24px; color: var(--accent); }
.stat span { color: var(--muted); font-size: 12px; }

.controls {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 170px 150px auto auto;
  gap: 12px;
  margin: 18px 0;
}
.search-wrap, select, .toggle {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}
.search-wrap { display: flex; align-items: center; gap: 8px; padding: 0 12px; }
.search-wrap input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); }
select { color: var(--ink); padding: 0 12px; }
.toggle { display: flex; align-items: center; gap: 8px; padding: 0 12px; color: var(--muted); white-space: nowrap; }

.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 18px; align-items: start; }
.sidebar {
  position: sticky;
  top: 92px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}
.sidebar h3 { font-size: 14px; margin: 12px 0 8px; }
.nav-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 6px 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.nav-btn.active { border-color: var(--accent); color: var(--accent); }
.source-list a { color: var(--accent); text-decoration: none; }
.source-list div { padding: 8px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

.cards { display: grid; gap: 14px; }
.card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}
.card.done { border-color: color-mix(in srgb, var(--good) 50%, var(--line)); }
.card-head { display: grid; grid-template-columns: minmax(0, 1fr) 42px; gap: 12px; }
.meta-line { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.question { font-size: 19px; line-height: 1.45; letter-spacing: 0; }
.done-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}
.done .done-btn { background: var(--good); color: #fff; border-color: var(--good); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.chip { padding: 5px 8px; border-radius: 6px; background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); font-size: 12px; }
.chip.warn { background: #fff4dd; color: var(--warn); }
body.dark .chip.warn { background: #3b2b12; }
.cue { padding: 10px 12px; border-left: 4px solid var(--accent-2); background: color-mix(in srgb, var(--accent-2) 10%, transparent); border-radius: 6px; color: var(--muted); }
.tabs { display: flex; gap: 8px; margin-top: 14px; border-bottom: 1px solid var(--line); }
.tabs button {
  padding: 10px 12px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); }
.panel { padding-top: 14px; line-height: 1.75; white-space: pre-wrap; }
.hidden { display: none; }
.empty { padding: 32px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: 8px; }

@media (max-width: 920px) {
  .hero, .layout { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(3, 1fr); }
  .controls { grid-template-columns: 1fr 1fr; }
  .search-wrap { grid-column: 1 / -1; }
  .sidebar { position: static; }
}

@media (max-width: 620px) {
  main { padding: 14px; }
  .topbar { padding: 12px 14px; }
  .brand img { width: 44px; height: 44px; }
  h1 { font-size: 16px; }
  .brand p { display: none; }
  .hero { padding: 18px; }
  .hero h2 { font-size: 23px; }
  .controls { grid-template-columns: 1fr; }
  .question { font-size: 17px; }
}