/* SIM·QA · 单页布局(搜索 + 知识库)+ 右下角微信风悬浮问答 */
:root{
  --bg:#f2f3f4; --panel:#ffffff; --deep:#eef1f1;
  --ink:#17191b; --soft:#4d565a; --faint:#5f6a6e;
  --rule:#dcdfe0; --rule-soft:#e8eaea;
  --accent:#07c160;                 /* 微信绿:全站统一强调色 */
  --wx-bg:#ededed;                  /* 聊天区灰底 */
  --wx-green:#95ec69;               /* 用户气泡绿 */
  --wx-link:#576b95;                /* 微信链接蓝 */
  --sans:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:Consolas,"Cascadia Code",Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font:15px/1.7 var(--sans);-webkit-font-smoothing:antialiased}
.mono{font-family:var(--mono)}
mark{background:#d9f3e3;color:inherit;padding:0 1px}

/* ---------- 顶栏 ---------- */
.top{display:flex;align-items:baseline;gap:14px;padding:16px 28px;border-bottom:1px solid var(--rule);background:var(--panel)}
.logo{font-weight:600;font-size:17px;letter-spacing:.02em}
.sub{color:var(--soft);font-size:13px}
.top .right{margin-left:auto;font-size:11px;color:var(--faint);letter-spacing:.08em}

.wrap{max-width:860px;margin:0 auto;padding:40px 24px 70px}
.foot{max-width:860px;margin:0 auto;padding:0 24px 36px;font-size:10.5px;color:var(--faint);letter-spacing:.06em}

/* ---------- 首屏与搜索 ---------- */
.hero h1{font-size:clamp(28px,4.6vw,42px);font-weight:600;letter-spacing:-.02em;line-height:1.15}
.hero p{margin-top:12px;color:var(--soft);max-width:600px}
.hero{padding-bottom:28px;border-bottom:1px solid var(--rule);margin-bottom:24px}

.searchbar{display:flex;gap:10px;margin-bottom:22px}
.searchbar input{flex:1;border:1px solid var(--rule);background:var(--panel);padding:13px 16px;font:15px var(--sans);color:var(--ink);outline:none;border-radius:8px}
.searchbar input:focus{border-color:var(--accent)}
.searchbar button{border:none;background:var(--accent);color:#fff;font:600 14px var(--sans);padding:0 26px;cursor:pointer;border-radius:8px}
.searchbar button:disabled{opacity:.5;cursor:default}

.card{border:1px solid var(--rule);background:var(--panel);padding:20px 22px;margin-bottom:14px;border-radius:10px}
.card .c-title{font-weight:600;font-size:15.5px}
.card .c-title mark{background:#d9f3e3}
.card .c-meta{font:400 11px var(--mono);color:var(--faint);margin-top:4px}
.card .c-snip{color:var(--soft);font-size:13.5px;margin-top:10px}
.card .c-snip mark{background:#d9f3e3}
.card .c-ask{margin-top:12px;display:flex;gap:10px}
.card .c-ask button{background:none;border:1px solid var(--rule);padding:5px 14px;font:500 12.5px var(--sans);color:var(--soft);cursor:pointer;border-radius:6px}
.card .c-ask button:hover{border-color:var(--accent);color:var(--accent)}
.empty{color:var(--faint);font-size:14px;padding:30px 0;text-align:center}

/* ---------- 知识库列表 ---------- */
.k-head{display:flex;align-items:baseline;gap:12px;border-top:1px solid var(--rule);padding-top:24px;margin:34px 0 14px}
.k-head h2{font-size:19px;font-weight:600}
.k-count{font-size:11px;color:var(--faint);letter-spacing:.06em}
.k-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.k-card{border:1px solid var(--rule);background:var(--panel);border-radius:10px;padding:16px 18px;display:flex;flex-direction:column;gap:8px}
.k-card:hover{border-color:var(--accent)}
.k-title{font-weight:600;font-size:14.5px;line-height:1.5;cursor:pointer}
.k-title:hover{color:var(--accent)}
.k-meta{font:400 10.5px var(--mono);color:var(--faint)}
.k-tags{display:flex;flex-wrap:wrap;gap:5px}
.k-tag{border:1px solid var(--rule-soft);border-radius:3px;padding:1px 7px;font-size:11px;color:var(--soft)}
.k-actions{display:flex;gap:16px;align-items:center;margin-top:auto}
.k-ask{background:none;border:none;color:var(--accent);font:600 12.5px var(--sans);cursor:pointer;padding:0}
.k-ask::before{content:"+ "}
.k-ask:hover{text-decoration:underline}
.k-view{background:none;border:none;color:var(--soft);font:500 12.5px var(--sans);cursor:pointer;padding:0}
.k-view:hover{color:var(--ink)}
.k-view:disabled,.card .c-ask button:disabled{opacity:.55;cursor:default}

/* 查看全文展开区 */
.doc-full{margin-top:12px;border-top:1px dashed var(--rule);padding-top:12px;font-size:13.5px;line-height:1.7;color:var(--ink)}
.doc-full .doc-meta{font:400 10.5px var(--mono);color:var(--faint);margin-bottom:8px}
.doc-full p{margin:0 0 8px}
.doc-full ul{margin:0 0 8px 18px}
.doc-full .md-h{font-weight:600;margin:10px 0 4px}
.doc-full figure{margin:10px 0;background:#f7f8f8;border-radius:6px;overflow:hidden;max-width:320px}
.doc-full img{display:block;max-width:100%}
.doc-full figcaption{font:400 10.5px var(--mono);color:var(--faint);padding:5px 10px;border-top:1px solid var(--rule-soft)}
.md-h{font-weight:600;margin:8px 0 4px}

/* ============================================================
   AI 问答 · 右下角悬浮聊天面板(微信风)
   ============================================================ */
.chat-launcher{position:fixed;right:26px;bottom:26px;z-index:60;width:60px;height:60px;border:none;border-radius:50%;background:var(--accent);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 20px rgba(7,193,96,.35)}
.chat-launcher svg{width:28px;height:28px}
.chat-launcher:hover{transform:translateY(-2px)}

.chat-panel{position:fixed;right:26px;bottom:100px;z-index:70;width:392px;max-width:calc(100vw - 32px);height:min(640px,calc(100dvh - 130px));display:none;flex-direction:column;border:1px solid var(--rule);border-radius:14px;overflow:hidden;background:var(--wx-bg);box-shadow:0 12px 40px rgba(0,0,0,.18)}
.chat-panel.open{display:flex;animation:panelIn .18s ease-out}
@keyframes panelIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

.chat-head{display:flex;align-items:center;gap:10px;padding:11px 14px;background:var(--panel);border-bottom:1px solid var(--rule);flex:none}
.ch-avatar{width:34px;height:34px;border-radius:6px;overflow:hidden;flex:none;line-height:0}
.ch-title{font-weight:600;font-size:14px;line-height:1.35}
.ch-sub{display:block;font:400 9.5px var(--mono);color:var(--faint);letter-spacing:.06em;font-weight:400}
.ch-close{margin-left:auto;background:none;border:none;font-size:22px;line-height:1;color:var(--faint);cursor:pointer;padding:0 2px}
.ch-close:hover{color:var(--ink)}

.room{flex:1;display:flex;flex-direction:column;min-height:0;background:var(--wx-bg);position:relative}
#jump-latest{position:absolute;left:50%;transform:translateX(-50%);bottom:76px;z-index:5;display:none;align-items:center;gap:4px;border:1px solid var(--rule);background:#fff;color:var(--soft);font:500 12px var(--sans);padding:6px 14px;border-radius:999px;cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.1)}
#jump-latest:hover{color:var(--accent);border-color:var(--accent)}
.thread{flex:1;min-height:0;overflow-y:auto;padding:16px 14px 12px;overscroll-behavior:contain}
.thread::-webkit-scrollbar{width:8px}
.thread::-webkit-scrollbar-thumb{background:#d4d7d8;border-radius:4px}
.thread::-webkit-scrollbar-track{background:transparent}

/* 消息 */
.m-time{text-align:center;font:400 11px/1 var(--mono);color:#a2a6a8;margin:8px 0 14px}
.m-row{display:flex;gap:10px;margin-bottom:16px;align-items:flex-start}
.m-row.user{flex-direction:row-reverse}
.avatar{width:36px;height:36px;border-radius:6px;flex:none}
.stack{display:flex;flex-direction:column;align-items:flex-start;gap:6px;max-width:78%;min-width:0}
.m-row.user .stack{align-items:flex-end}

.bubble{position:relative;padding:10px 13px;border-radius:8px;font-size:14.5px;line-height:1.7;max-width:100%;word-break:break-word;color:#111}
.m-row.bot .bubble{background:#fff;border-top-left-radius:2px}
.m-row.user .bubble{background:var(--wx-green);border-top-right-radius:2px}
.m-row.bot .bubble::before{content:"";position:absolute;left:-5px;top:14px;border-top:5px solid transparent;border-bottom:5px solid transparent;border-right:5px solid #fff}
.m-row.user .bubble::before{content:"";position:absolute;right:-5px;top:14px;border-top:5px solid transparent;border-bottom:5px solid transparent;border-left:5px solid var(--wx-green)}

.bubble p{margin:0 0 8px}
.bubble p:last-child{margin-bottom:0}
.bubble ul{margin:0 0 8px 18px}
.bubble ol{margin:0 0 8px 20px}
.bubble li{margin-bottom:4px}
.bubble strong{font-weight:600}
.bubble code{font:500 12px var(--mono);background:rgba(0,0,0,.06);padding:1px 5px;border-radius:3px}
.bubble figure{margin:10px 0 2px;background:#f7f8f8;border-radius:6px;overflow:hidden;max-width:280px}
.bubble img{display:block;max-width:100%}
.bubble figcaption{font:400 10.5px var(--mono);color:var(--faint);padding:5px 10px;border-top:1px solid var(--rule-soft)}
.bubble sup.cite{font:600 10px var(--mono);color:var(--faint);background:#f0f1f1;border-radius:3px;padding:0 4px;margin-left:2px;vertical-align:1px}
.bubble .ext-note{color:var(--faint);font-size:12.5px}

.cursor{display:inline-block;width:7px;height:15px;background:var(--accent);vertical-align:-2px;margin-left:2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.typing{display:inline-flex;gap:5px;padding:3px 2px;vertical-align:middle}
.typing i{width:6px;height:6px;border-radius:50%;background:#b9bdbf;animation:wxtyping 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes wxtyping{0%,80%,100%{opacity:.3;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}

.src-card{background:#fff;border-radius:8px;border-top-left-radius:2px;max-width:100%;min-width:230px;overflow:hidden}
.src-hd{font:600 10px var(--mono);letter-spacing:.1em;color:#a2a6a8;padding:8px 12px 5px}
.src-row{display:flex;align-items:baseline;gap:8px;padding:8px 12px;border-top:1px solid var(--rule-soft);font-size:12.5px;color:var(--soft)}
.src-no{font:600 10px var(--mono);color:#a2a6a8;flex:none}
.src-row a{color:var(--wx-link);text-decoration:none;overflow-wrap:anywhere}
.src-row a:hover{text-decoration:underline}
.src-date{margin-left:auto;font:400 10px var(--mono);color:#bcbfc1;flex:none}

.ans-fb{display:flex;gap:16px;padding:2px 2px 0}
.ans-fb button{background:none;border:none;font:400 11.5px var(--sans);color:#9ba0a2;cursor:pointer;padding:0;display:inline-flex;align-items:center;gap:4px}
.ans-fb button:hover,.ans-fb button.on{color:var(--accent)}

.wx-menu{margin-top:10px;border:1px solid var(--rule-soft);border-radius:8px;overflow:hidden}
.wx-menu button{display:flex;width:100%;justify-content:space-between;align-items:center;background:#fff;border:none;border-top:1px solid var(--rule-soft);padding:10px 13px;font:400 13.5px var(--sans);color:var(--soft);cursor:pointer;text-align:left}
.wx-menu button::after{content:"›";color:#c3c7c9;font-size:16px;line-height:1}
.wx-menu button:hover{background:#f6f7f8;color:var(--ink)}

.composer{display:flex;gap:10px;padding:10px;background:#f7f7f7;border-top:1px solid var(--rule);flex:none}
.composer input{flex:1;background:#fff;border:1px solid var(--rule);border-radius:8px;padding:11px 14px;font:14.5px var(--sans);color:var(--ink);outline:none;min-width:0}
.composer input:focus{border-color:var(--accent)}
.composer button{border:none;background:var(--accent);color:#fff;font:600 14px var(--sans);padding:0 22px;border-radius:8px;cursor:pointer;flex:none}
.composer button:disabled{background:#c6cacc;cursor:default}

/* ---------- 图片放大预览(lightbox) ---------- */
.bubble figure img,.doc-full figure img{cursor:zoom-in}
.lightbox{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;flex-direction:column;gap:12px;background:rgba(23,25,27,.85);padding:30px}
.lightbox.open{display:flex;animation:lbIn .16s ease-out}
@keyframes lbIn{from{opacity:0}to{opacity:1}}
.lightbox img{max-width:min(94vw,1100px);max-height:82vh;border-radius:8px;background:#fff;box-shadow:0 18px 60px rgba(0,0,0,.45)}
.lightbox-cap{color:#e8eaeb;font-size:13px;max-width:88vw;text-align:center;overflow-wrap:anywhere}
.lightbox-x{position:fixed;top:16px;right:20px;width:40px;height:40px;border:none;border-radius:50%;background:rgba(255,255,255,.12);color:#fff;font-size:26px;line-height:1;cursor:pointer}
.lightbox-x:hover{background:rgba(255,255,255,.24)}

/* ---------- 响应式 ---------- */
@media (max-width:640px){
  .k-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .top{padding:14px 16px}
  .sub{display:none}
  .wrap{padding:26px 14px 50px}
  .chat-launcher{right:16px;bottom:16px;width:54px;height:54px}
  .chat-panel{right:0;left:0;bottom:0;width:100%;max-width:none;height:86vh;height:86dvh;border-radius:14px 14px 0 0}
  .stack{max-width:85%}
  .avatar{width:32px;height:32px}
  .bubble{font-size:14px}
  .composer input{font-size:16px} /* 防 iOS 聚焦缩放 */
  .searchbar button{padding:0 18px}
}