:root {
  --primary: #0f4c81;
  --primary-light: #e8f1f8;
  --accent: #e8a33d;
  --danger: #c0392b;
  --warn-bg: #fdf3e7;
  --ok: #1e8e5a;
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #dde4ec;
  --text: #24303c;
  --text-2: #5b6b7b;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", -apple-system, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
}
.topbar {
  background: linear-gradient(135deg, #0f4c81, #1668a5);
  color: #fff; padding: 18px 32px; display: flex; align-items: center; gap: 14px;
}
.topbar .logo { font-size: 22px; font-weight: 700; letter-spacing: 1px; }
.topbar .sub { opacity: .85; font-size: 13px; }
.topbar .spacer { flex: 1; }
.topbar a.btn {
  background: rgba(255,255,255,.15); color: #fff; text-decoration: none;
  padding: 8px 18px; border-radius: 20px; font-size: 14px; border: 1px solid rgba(255,255,255,.4);
  transition: .2s;
}
.topbar a.btn:hover { background: rgba(255,255,255,.3); }
.container { max-width: 1280px; margin: 0 auto; padding: 24px 32px 60px; }

/* ---- 层级行 ---- */
.layer-row { display: flex; gap: 16px; margin-bottom: 20px; align-items: stretch; }
.layer-label {
  flex: 0 0 128px; display: flex; flex-direction: column; justify-content: center;
  background: var(--primary); color: #fff; border-radius: 10px; padding: 14px;
  text-align: center;
}
.layer-label .name { font-size: 16px; font-weight: 700; }
.layer-label .desc { font-size: 12px; opacity: .8; margin-top: 4px; }
.layer-products { flex: 1; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }

/* ---- 产品卡片 ---- */
.pcard {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; cursor: pointer; transition: .2s; position: relative;
}
.pcard:hover { box-shadow: 0 4px 16px rgba(15,76,129,.14); transform: translateY(-2px); }
.pcard h3 { font-size: 16px; color: var(--primary); margin-bottom: 2px; }
.pcard .pic {
  width: 100%; height: 150px; object-fit: contain; border-radius: 6px;
  background: #f7f9fc; border: 1px solid var(--border); margin-bottom: 10px; display: block;
}
.pcard .cat { font-size: 12px; color: var(--text-2); margin-bottom: 8px; }
.pcard .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.tag {
  font-size: 11px; padding: 2px 8px; border-radius: 10px;
  background: var(--primary-light); color: var(--primary);
}
.tag.warn { background: var(--warn-bg); color: #9a6b1f; }
.tag.hot { background: #fdeaea; color: var(--danger); }
.pcard ul { padding-left: 18px; font-size: 13px; color: var(--text-2); }
.pcard ul.hl li { color: var(--text); margin-bottom: 2px; }
.pcard .detail { display: none; margin-top: 10px; border-top: 1px dashed var(--border); padding-top: 10px; font-size: 12.5px; }
.pcard.open .detail { display: block; }
.pcard .detail .kv { display: grid; grid-template-columns: 74px 1fr; gap: 2px 8px; }
.pcard .detail .kv b { color: var(--text-2); font-weight: 600; }
.pcard .detail .cons { color: var(--danger); margin-top: 6px; }
.pcard .toggle { position: absolute; top: 14px; right: 14px; font-size: 12px; color: var(--text-2); }

.footer-note { text-align: center; color: var(--text-2); font-size: 12px; margin-top: 30px; }

/* ---- 对话页 ---- */
.chat-wrap { max-width: 900px; margin: 0 auto; padding: 24px 24px 90px; }
.demo-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.demo-bar button {
  background: var(--primary-light); color: var(--primary); border: 1px solid #c5d8e8;
  border-radius: 16px; padding: 6px 14px; font-size: 13px; cursor: pointer; transition: .15s;
}
.demo-bar button:hover { background: var(--primary); color: #fff; }
.msg { display: flex; margin-bottom: 16px; }
.msg .avatar {
  flex: 0 0 38px; height: 38px; border-radius: 50%; margin-right: 12px;
  display: flex; align-items: center; justify-content: center; font-size: 15px; color: #fff;
}
.msg.user .avatar { background: #6b7c8f; }
.msg.ai .avatar { background: var(--primary); }
.msg .bubble { max-width: 86%; }
.msg .name { font-size: 12px; color: var(--text-2); margin-bottom: 4px; }
.msg .body {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; font-size: 14px;
}
.msg.user .body { background: var(--primary-light); border-color: #c9dced; }

/* 推荐卡片内部 */
.rec-card { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; background: #fbfcfe; }
.rec-card.main { border-left: 4px solid var(--ok); }
.rec-card.alt { border-left: 4px solid var(--accent); }
.rec-card .rc-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.rec-card .rc-head b { font-size: 15px; color: var(--primary); }
.badge { font-size: 11px; padding: 1px 9px; border-radius: 10px; }
.badge.main { background: #e5f4ec; color: var(--ok); }
.badge.alt { background: var(--warn-bg); color: #9a6b1f; }
.badge.conf-high { background: #e5f4ec; color: var(--ok); }
.badge.conf-mid { background: var(--warn-bg); color: #9a6b1f; }
.rec-card ul { padding-left: 18px; font-size: 13px; }
.rec-card .dn { font-size: 12.5px; color: #9a6b1f; margin-top: 6px; background: var(--warn-bg); border-radius: 6px; padding: 6px 10px; }
.sec-title { font-size: 13px; font-weight: 700; margin: 12px 0 6px; color: var(--text); }
.rej-list .item, .risk-list .item, .fu-list .item {
  font-size: 13px; padding: 6px 10px; border-radius: 6px; margin-bottom: 5px;
}
.rej-list .item { background: #f7f0f0; color: var(--danger); }
.risk-list .item { background: var(--warn-bg); color: #9a6b1f; }
.fu-list .item { background: #eef4fa; color: var(--primary); }
.combo-box { background: #f0f7f3; border: 1px dashed var(--ok); border-radius: 8px; padding: 8px 12px; font-size: 13px; margin-bottom: 10px; }

/* 输入区 */
.input-bar {
  position: fixed; bottom: 0; left: 0; right: 0; background: #fff;
  border-top: 1px solid var(--border); padding: 14px 24px;
}
.input-bar .inner { max-width: 852px; margin: 0 auto; display: flex; gap: 10px; }
.input-bar textarea {
  flex: 1; resize: none; border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 14px; font-size: 14px; font-family: inherit; height: 52px; outline: none;
}
.input-bar textarea:focus { border-color: var(--primary); }
.input-bar button {
  background: var(--primary); color: #fff; border: none; border-radius: 8px;
  padding: 0 26px; font-size: 15px; cursor: pointer;
}
.input-bar button:disabled { background: #9db3c6; cursor: not-allowed; }
.typing { color: var(--text-2); font-size: 13px; }
.error-box { color: var(--danger); font-size: 13px; background: #fdeaea; border-radius: 6px; padding: 8px 12px; }

/* ---- 输入区扩展：附件 / 联网开关 / 状态行 ---- */
.input-bar .inner { align-items: stretch; }
.icon-btn {
  flex: 0 0 46px; background: var(--primary-light); color: var(--primary);
  border: 1px solid #c5d8e8; border-radius: 8px; font-size: 17px; cursor: pointer; transition: .15s;
}
.icon-btn:hover { background: var(--primary); color: #fff; }
.right-col { display: flex; flex-direction: column; gap: 6px; }
.right-col button { padding: 0 24px; flex: 1; }
.web-toggle {
  display: flex; align-items: center; justify-content: center; gap: 4px;
  font-size: 12px; color: var(--text-2); cursor: pointer; user-select: none; white-space: nowrap;
}
.web-toggle input { accent-color: var(--primary); cursor: pointer; }
.web-toggle.on { color: var(--primary); font-weight: 700; }
.status-line { max-width: 852px; margin: 6px auto 0; font-size: 12px; color: var(--text-2); min-height: 16px; }
.status-line.err { color: var(--danger); }

/* ---- 流式渲染 ---- */
.cursor { display: inline-block; color: var(--primary); font-weight: 700; animation: blink 1s step-start infinite; }
@keyframes blink { 50% { opacity: 0; } }
.generating { color: var(--text-2); font-size: 12.5px; padding: 4px 2px; }
.search-note { font-size: 12px; color: #9a6b1f; background: var(--warn-bg); border-radius: 6px; padding: 4px 10px; margin-bottom: 8px; }

/* ---- 依据溯源标签与弹窗 ---- */
.cite {
  display: inline-block; background: #eef4fa; color: var(--primary); border: 1px solid #c5d8e8;
  border-radius: 10px; font-size: 11px; padding: 0 8px; margin-left: 4px; cursor: pointer;
  vertical-align: 1px; transition: .15s;
}
.cite:hover { background: var(--primary); color: #fff; }
.modal-mask {
  position: fixed; inset: 0; background: rgba(20, 32, 45, .45); display: none;
  align-items: center; justify-content: center; z-index: 100; padding: 24px;
}
.modal {
  background: #fff; border-radius: 12px; width: min(860px, 94vw); max-height: 86vh;
  display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 12px 40px rgba(0, 0, 0, .25);
}
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 18px; border-bottom: 1px solid var(--border); background: var(--primary-light);
}
.modal-head b { color: var(--primary); font-size: 14px; }
.modal-head button { border: none; background: none; font-size: 16px; cursor: pointer; color: var(--text-2); }
.modal-body { overflow: auto; padding: 16px 20px; }
.archive-md {
  font-family: inherit; font-size: 12.5px; white-space: pre-wrap; word-break: break-word;
  color: var(--text); line-height: 1.7;
}
.md-h { font-weight: 700; color: var(--primary); }
.hl-line { background: #fff3d6; font-weight: 700; color: var(--primary); border-radius: 4px; padding: 2px 6px; }

/* ---- 导出条 ---- */
.export-bar {
  margin-top: 10px; padding-top: 8px; border-top: 1px dashed var(--border);
  display: flex; gap: 8px; align-items: center; font-size: 12px; color: var(--text-2); flex-wrap: wrap;
}
.export-bar button {
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  padding: 3px 12px; font-size: 12px; cursor: pointer; color: var(--primary); transition: .15s;
}
.export-bar button:hover { background: var(--primary); color: #fff; }

/* ---- 回到底部悬浮按钮 ---- */
#backBottom {
  position: fixed; right: 28px; bottom: 132px; z-index: 60;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border); background: #fff; color: var(--primary);
  font-size: 16px; cursor: pointer; box-shadow: 0 4px 14px rgba(15, 76, 129, .22);
  opacity: 0; pointer-events: none; transform: translateY(8px); transition: .2s;
}
#backBottom.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
#backBottom:hover { background: var(--primary); color: #fff; }