:root {
  --navy: #0b3a6e;
  --blue: #1c5ea8;
  --gold: #c9a227;
  --bg: #f3f6fb;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5b6777;
  --line: #d9e2ee;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 400px at 10% -10%, rgba(28, 94, 168, 0.18), transparent),
    radial-gradient(700px 300px at 90% 0%, rgba(201, 162, 39, 0.16), transparent),
    linear-gradient(180deg, #eaf1fa 0%, #f3f6fb 40%, #eef3f8 100%);
}

.top {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand { display: flex; gap: 14px; align-items: center; }
.mark {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--navy), var(--blue));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 1px;
  box-shadow: 0 8px 20px rgba(11, 58, 110, 0.28);
}
h1 { font-size: 22px; margin: 0 0 4px; }
.brand p, footer { color: var(--muted); font-size: 13px; }
.brand a, .official { color: var(--blue); }
.official {
  text-decoration: none;
  border: 1px solid var(--line);
  background: #fff;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
}

.layout {
  max-width: 1100px;
  margin: 12px auto 24px;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
}

.panel, .chat-wrap {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(28, 52, 84, 0.06);
}
.panel { padding: 18px; }
.panel h2 { font-size: 14px; margin: 8px 0 10px; color: var(--navy); }
.chips { display: flex; flex-direction: column; gap: 8px; }
.chips button {
  text-align: left;
  border: 1px solid var(--line);
  background: #f8fbff;
  color: var(--text);
  border-radius: 12px;
  padding: 9px 10px;
  cursor: pointer;
  font-size: 13px;
}
.chips button:hover { border-color: #9cbcde; background: #eef5ff; }
.cats { padding-left: 18px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.hint { font-size: 12px; color: var(--muted); }

.chat-wrap { display: flex; flex-direction: column; min-height: 72vh; }
.messages {
  flex: 1;
  overflow: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.bubble {
  max-width: 92%;
  padding: 12px 14px;
  border-radius: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  font-size: 14px;
}
.bubble.bot { background: #f4f8fd; border: 1px solid var(--line); }
.bubble.user {
  margin-left: auto;
  background: linear-gradient(145deg, var(--navy), var(--blue));
  color: #fff;
}
.sources { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.sources a {
  font-size: 12px;
  color: var(--blue);
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 9px;
}
.sources a:hover { border-color: #9cbcde; }
.meta { font-size: 12px; color: var(--gold); margin-bottom: 6px; }

.composer {
  display: flex;
  gap: 8px;
  padding: 14px;
  border-top: 1px solid var(--line);
}
.composer input {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  outline: none;
}
.composer input:focus { border-color: #7aa4d4; }
.composer button {
  border: 0;
  background: var(--navy);
  color: #fff;
  border-radius: 12px;
  padding: 0 18px;
  cursor: pointer;
  font-size: 14px;
}
.composer button:disabled { opacity: 0.6; cursor: default; }

.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.official.ghost { background: transparent; cursor: pointer; }
.error { color: #b42318; font-size: 13px; }
.admin-page {
  max-width: 960px;
  margin: 12px auto 24px;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(28, 52, 84, 0.06);
}
.card h2 { margin: 0 0 10px; font-size: 18px; color: var(--navy); }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.form-grid .full { grid-column: 1 / -1; }
.form-grid label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.form-grid input, .form-grid select, .form-grid textarea {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
}
.form-grid button, .composer button {
  border: 0;
  background: var(--navy);
  color: #fff;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
  font-size: 14px;
}
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
}
.stat strong { display: block; font-size: 22px; color: var(--navy); }
.stat span { font-size: 12px; color: var(--muted); }
.doc-list { display: flex; flex-direction: column; gap: 10px; }
.doc-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.doc-item.off { opacity: 0.6; }
.doc-item h3 { margin: 0 0 4px; font-size: 15px; }
.doc-item p { margin: 0; font-size: 13px; color: var(--muted); }
.doc-actions { display: flex; flex-direction: column; gap: 6px; }
.doc-actions button {
  border: 1px solid var(--line);
  background: #f8fbff;
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer;
}
.doc-actions .danger { color: #b42318; }

footer { max-width: 1100px; margin: 0 auto 24px; padding: 0 20px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .top { flex-direction: column; align-items: flex-start; }
  .chat-wrap { min-height: 68vh; }
  .form-grid, .stat-row { grid-template-columns: 1fr; }
  .doc-item { flex-direction: column; }
}