:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #1f2733;
  --muted: #7a8494;
  --line: #e3e7ee;
  --accent: #3556c9;
  --accent-soft: #eaefff;
  --ok: #1a7f4f;
  --warn-bg: #fff7e8;
  --warn-ink: #8a6116;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(20, 30, 60, .08);
  font-size: 15px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { font-size: 17px; margin: 0; }
.brand p { margin: 2px 0 0; font-size: 12px; color: var(--muted); }

.logo {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  border-radius: 10px;
  font-size: 19px;
}

.raw-link { color: var(--accent); font-size: 13px; text-decoration: none; }

main {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
  max-width: 1200px;
  margin: 18px auto;
  padding: 0 18px;
  align-items: start;
}

/* ---------- list ---------- */
#list-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: sticky;
  top: 76px;
  overflow: hidden;
}

.list-head {
  display: flex;
  justify-content: space-between;
  padding: 12px 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

.asset-list { list-style: none; margin: 0; padding: 6px; max-height: calc(100vh - 160px); overflow: auto; }

.asset-item {
  padding: 10px 12px;
  border-radius: 9px;
  cursor: pointer;
  border: 1px solid transparent;
}
.asset-item:hover { background: var(--accent-soft); }
.asset-item.active { background: var(--accent-soft); border-color: #c6d4ff; }

.asset-item .t { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.asset-item .s {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.asset-item .m { margin-top: 6px; font-size: 11px; color: var(--muted); }

/* ---------- badges ---------- */
.badge {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
  letter-spacing: .04em;
  color: #fff;
  flex: none;
}
.badge.pdf    { background: #d64541; }
.badge.docx   { background: #2b6cb0; }
.badge.pptx   { background: #dd7c1c; }
.badge.xlsx   { background: #1a7f4f; }
.badge.png, .badge.jpg { background: #7c5cd6; }
.badge.audio  { background: #0d9488; }
.badge.video  { background: #c2255c; }
.badge.other  { background: #6b7280; }
.badge.lang   { background: #93a1b4; }

/* ---------- detail ---------- */
.detail {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 30px 40px;
  min-height: 60vh;
}

.detail h2.title { margin: 6px 0 4px; font-size: 24px; line-height: 1.35; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 10px 0 4px; }
.meta .chip {
  font-size: 12px;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 10px;
}

.summary {
  margin: 18px 0;
  padding: 14px 16px;
  background: var(--accent-soft);
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.7;
}
.summary::before {
  content: "摘要";
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.sec-h { margin: 26px 0 8px; font-size: 18px; }
.sec-h.lv3, .sec-h.lv4, .sec-h.lv5 { font-size: 15px; color: #3a4658; }
.sec-p { margin: 8px 0; line-height: 1.85; white-space: pre-wrap; }

.block-title {
  margin: 30px 0 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--line);
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: .06em;
}

table.doc-table {
  border-collapse: collapse;
  margin: 10px 0 16px;
  width: 100%;
  font-size: 13.5px;
}
.doc-table caption { caption-side: top; text-align: left; color: var(--muted); font-size: 12px; padding-bottom: 6px; }
.doc-table th, .doc-table td {
  border: 1px solid var(--line);
  padding: 7px 10px;
  text-align: left;
}
.doc-table th { background: #f0f3f9; }
.doc-table tr:nth-child(even) td { background: #fafbfd; }

.img-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.img-card { margin: 0; }
.img-card img {
  width: 100%;
  height: 170px;
  object-fit: contain;
  background: #f2f3f7;
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: zoom-in;
}
.img-card figcaption { font-size: 12px; color: var(--muted); margin-top: 5px; }

/* ---------- media ---------- */
.media-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  margin: 10px 0 16px;
}
.media-card video, .media-card audio { width: 100%; border-radius: 8px; }

.cues { list-style: none; margin: 12px 0 0; padding: 0; max-height: 260px; overflow: auto; }
.cues li {
  display: flex;
  gap: 10px;
  padding: 6px 8px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13.5px;
  line-height: 1.6;
}
.cues li:hover { background: var(--accent-soft); }
.cues li.active { background: var(--accent-soft); outline: 1px solid #c6d4ff; }
.cues .t {
  flex: none;
  font-family: ui-monospace, Menlo, monospace;
  font-size: 11.5px;
  color: var(--accent);
  padding-top: 2px;
}

.frames { display: flex; gap: 8px; overflow-x: auto; margin-top: 12px; padding-bottom: 4px; }
.frames img { height: 84px; border-radius: 6px; border: 1px solid var(--line); cursor: zoom-in; }

.warn-box {
  margin-top: 22px;
  background: var(--warn-bg);
  color: var(--warn-ink);
  border-radius: 9px;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
}
.warn-box strong { display: block; margin-bottom: 2px; }

.raw-files { margin-top: 26px; font-size: 13px; color: var(--muted); }
.raw-files a { color: var(--accent); text-decoration: none; margin-right: 14px; }

/* ---------- misc ---------- */
.lightbox {
  position: fixed; inset: 0;
  background: rgba(15, 20, 30, .82);
  display: grid;
  place-items: center;
  z-index: 50;
  cursor: zoom-out;
}
.lightbox img { max-width: 92vw; max-height: 84vh; border-radius: 8px; }
.lightbox p { color: #dfe6f2; font-size: 13px; }

.muted { color: var(--muted); }
.center { text-align: center; }
.error { color: #c0392b; padding: 12px; font-size: 14px; line-height: 1.6; }
.hidden { display: none !important; }

@media (max-width: 860px) {
  main { grid-template-columns: 1fr; }
  #list-panel { position: static; }
  .asset-list { max-height: 240px; }
}