/* 配色与导航栏沿用博客 Volantis 主题（与 /html/conv/ 一致），日夜间共用 localStorage 键 "color-scheme" */
@font-face{font-family:'UbuntuMono';font-style:normal;font-weight:400;font-display:swap;src:url('https://unpkg.com/volantis-static@0.0.1660614606622/media/fonts/UbuntuMono/UbuntuMono-Regular.ttf') format('truetype')}
@font-face{font-family:'Varela Round';font-style:normal;font-weight:400;font-display:swap;src:url('https://unpkg.com/volantis-static@0.0.1660614606622/media/fonts/VarelaRound/VarelaRound-Regular.ttf') format('truetype')}
:root{--bg:#edf1f5;--panel:#fff;--panel-2:#e3e9ef;--text:#1f2a37;--para:#33414f;--head:#111c28;--muted:#7a8794;--line:rgba(31,42,55,.13);--accent:#4f7699;--accent-2:#3e6384;--accent-soft:rgba(79,118,153,.12);--ochre:#b27a35;--ochre-soft:rgba(178,122,53,.14);--danger:#b3402f;--nav:rgba(255,255,255,.9);--code:#0e1724;--code-text:#dbe5ee;--shadow:0 1px 2px rgba(0,0,0,.1);--grad2:#3e6384;--dot:rgba(31,42,55,.06);--glow:rgba(31,42,55,.10);--bot:#f3f6f9;--userbg:#3e6384;--mono:ui-monospace,'UbuntuMono',Menlo,Consolas,monospace;--sans:'UbuntuMono','Varela Round','PingFang SC','Microsoft YaHei',Helvetica,Arial,sans-serif}
@media(prefers-color-scheme:dark){:root:not([color-scheme="light"]){--bg:#0c121c;--panel:#14202f;--panel-2:#1b2a3c;--text:#d3dde7;--para:#c3cfdb;--head:#eef3f8;--muted:#8394a5;--line:rgba(159,191,220,.16);--accent:#8fb3d1;--accent-2:#9fbfdc;--accent-soft:rgba(143,179,209,.14);--ochre:#d0a066;--ochre-soft:rgba(208,160,102,.16);--danger:#e0816f;--nav:rgba(20,32,47,.92);--code:#0e1724;--code-text:#dbe5ee;--shadow:0 1px 2px rgba(0,0,0,.45);--grad2:#6f9cc0;--dot:rgba(159,191,220,.06);--glow:rgba(0,0,0,.35);--bot:#182638;--userbg:#2b4560}}
:root[color-scheme="dark"]{--bg:#0c121c;--panel:#14202f;--panel-2:#1b2a3c;--text:#d3dde7;--para:#c3cfdb;--head:#eef3f8;--muted:#8394a5;--line:rgba(159,191,220,.16);--accent:#8fb3d1;--accent-2:#9fbfdc;--accent-soft:rgba(143,179,209,.14);--ochre:#d0a066;--ochre-soft:rgba(208,160,102,.16);--danger:#e0816f;--nav:rgba(20,32,47,.92);--code:#0e1724;--code-text:#dbe5ee;--shadow:0 1px 2px rgba(0,0,0,.45);--grad2:#6f9cc0;--dot:rgba(159,191,220,.06);--glow:rgba(0,0,0,.35);--bot:#182638;--userbg:#2b4560}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--para);font-family:var(--sans);font-size:16px;line-height:1.6;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}
a{color:var(--accent-2);text-decoration:none}a:hover{color:var(--accent)}
button{font:inherit}

/* 导航栏（与主页一致） */
.navbar{flex:none;height:64px;background:var(--nav);box-shadow:var(--shadow);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);z-index:10}
.nav-inner{max-width:1040px;height:64px;margin:0 auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.nav-brand{display:flex;align-items:center}.nav-brand img{height:40px;width:auto}
.nav-links{display:flex;align-items:center;gap:2px;overflow-x:auto;scrollbar-width:none}.nav-links i{margin-right:6px}
.nav-links a,.nav-links button{white-space:nowrap;color:var(--text);font-size:14px;padding:6px 12px;border-radius:4px;background:none;border:0;cursor:pointer}
.nav-links a:hover,.nav-links button:hover{background:var(--accent-soft);color:var(--accent)}

/* 布局 */
.wrap{flex:1;min-height:0;width:100%;margin:0 auto;padding:16px}
.layout{display:flex;gap:16px;max-width:1200px}
.card{display:flex;flex-direction:column;background:var(--panel);border-radius:8px;box-shadow:0 2px 12px rgba(0,0,0,.12);overflow:hidden}
.chatcard{flex:1;min-width:0;height:100%;position:relative;border:1px solid var(--line)}
.chatcard::before{content:"";position:absolute;inset:0 0 auto 0;height:2px;background:var(--accent);opacity:.8;transition:background .3s}
.chatcard.research::before{background:var(--ochre)}

/* AI 头像 */
.ai-avatar{flex:none;position:relative;display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;color:#fff;font-size:14px;background:#1f3a93;box-shadow:0 0 0 2px var(--panel),0 2px 8px var(--glow)}
.ai-avatar img{width:100%;height:100%;border-radius:50%;display:block}
.ai-avatar.lg{width:42px;height:42px;font-size:18px}
.ai-avatar.xl{width:76px;height:76px;font-size:32px;margin:0 auto;animation:breathe 3.2s ease-in-out infinite}
.ai-avatar .dot{position:absolute;right:-1px;bottom:-1px;width:12px;height:12px;border-radius:50%;background:#5fa37a;border:2px solid var(--panel)}
@keyframes breathe{50%{box-shadow:0 0 0 6px var(--accent-soft)}}

/* 顶栏 */
.bar{display:flex;align-items:center;gap:12px;padding:14px 18px 12px}
.title{flex:1;min-width:0}
.title h1{margin:0;font-size:18px;font-weight:600;color:var(--head);line-height:1.3;font-family:'Varela Round',var(--sans)}
.title p{margin:1px 0 0;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.live{display:inline-block;width:6px;height:6px;border-radius:50%;background:#5fa37a;margin-right:6px;vertical-align:middle}
.seg{display:flex;padding:3px;border-radius:999px;background:var(--panel-2);border:1px solid var(--line)}
.seg button{display:flex;align-items:center;gap:6px;border:0;background:none;color:var(--muted);font-size:13px;padding:5px 12px;border-radius:999px;cursor:pointer;white-space:nowrap;transition:all .2s}
.seg button:hover{color:var(--text)}
.seg button.on{background:var(--panel);color:var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.15)}
.icon-btn{width:36px;height:36px;flex:none;display:flex;align-items:center;justify-content:center;border-radius:50%;border:1px solid var(--line);background:var(--panel-2);color:var(--text);cursor:pointer;transition:all .2s}
.icon-btn:hover{color:var(--accent);border-color:var(--accent);transform:rotate(-8deg)}

/* 用量条 */
.meters{display:flex;gap:18px;padding:0 18px 12px;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.meter{flex:1;min-width:0;display:flex;align-items:center;gap:8px}
.meter>i{color:var(--accent);font-size:12px}
.mlabel{white-space:nowrap}
.meter b{font-weight:400;color:var(--text);white-space:nowrap;font-family:var(--mono)}
.track{flex:1;min-width:30px;height:5px;border-radius:3px;background:var(--panel-2);overflow:hidden}
.track i{display:block;height:100%;width:0;border-radius:3px;background:var(--accent);transition:width .5s}
.track i.warn{background:var(--danger)}

/* 对话区 */
main{flex:1;overflow-y:auto;padding:22px 20px 8px;background:radial-gradient(var(--dot) 1px,transparent 1px);background-size:22px 22px;scroll-behavior:smooth}
.hero{text-align:center;padding:6px 0 18px;animation:rise .5s both}
.hero h2{margin:16px 0 4px;font-size:24px;font-weight:600;color:var(--head);font-family:'Varela Round',var(--sans)}
.hero p{margin:0;font-size:14px;color:var(--muted)}
.grad{color:var(--accent)}
.hero.research .grad{color:var(--ochre)}

.msg{display:flex;align-items:flex-start;gap:10px;margin-bottom:18px;animation:rise .3s both}
.msg.user{flex-direction:row-reverse}
.msg .col{min-width:0;max-width:min(86%,720px);display:flex;flex-direction:column}
.msg.user .col{align-items:flex-end}
.u-avatar{flex:none;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--panel-2);color:var(--muted);font-size:13px;border:1px solid var(--line)}
.bubble{padding:10px 14px;border-radius:14px;word-break:break-word;line-height:1.7}
.user .bubble{background:var(--userbg);color:#fff;white-space:pre-wrap;border-top-right-radius:4px}
.bot .bubble{background:var(--bot);color:var(--para);border:1px solid var(--line);border-top-left-radius:4px}
.bubble>:first-child{margin-top:0}.bubble>:last-child{margin-bottom:0}
.bubble h1,.bubble h2,.bubble h3,.bubble h4{color:var(--head);line-height:1.4;margin:14px 0 6px}
.bubble h1{font-size:1.25em}.bubble h2{font-size:1.15em}.bubble h3{font-size:1.05em}.bubble h4{font-size:1em}
.bubble h2,.bubble h3{padding-left:10px;border-left:3px solid var(--accent)}
.bubble p{margin:8px 0}.bubble ul,.bubble ol{margin:8px 0;padding-left:22px}.bubble li{margin:3px 0}.bubble li::marker{color:var(--accent)}
.bubble a{color:var(--accent);border-bottom:1px dashed currentColor}.bubble a:hover{color:var(--accent-2)}
.bubble blockquote{margin:8px 0;padding:6px 12px;border-left:3px solid var(--ochre);background:var(--accent-soft);border-radius:0 6px 6px 0;color:var(--text)}
.bubble hr{border:0;border-top:1px dashed var(--line);margin:12px 0}
.bubble code{font-family:var(--mono);color:var(--accent);background:var(--accent-soft);padding:1px 5px;border-radius:4px;font-size:.88em}
.bubble pre{margin:0;background:var(--code);color:var(--code-text);padding:12px 14px;overflow-x:auto;font-size:13px;line-height:1.55;font-family:var(--mono)}
.bubble pre code,.bubble pre code.hljs{padding:0;background:none;color:inherit;border-radius:0}
.bubble table{border-collapse:separate;border-spacing:0;margin:10px 0;font-size:14px;border:1px solid var(--line);border-radius:8px;overflow:hidden;display:block;overflow-x:auto;max-width:100%}
.bubble th{background:var(--accent-soft);color:var(--head);font-weight:600}
.bubble td,.bubble th{padding:6px 12px;border-bottom:1px solid var(--line);text-align:left}
.bubble tr:last-child td{border-bottom:0}
.actions{display:flex;gap:4px;margin-top:4px;opacity:0;transition:opacity .2s}
.msg:hover .actions,.actions:focus-within{opacity:1}
.actions button{border:0;background:none;color:var(--muted);font-size:12px;padding:2px 8px;border-radius:4px;cursor:pointer}
.actions button:hover{color:var(--accent);background:var(--accent-soft)}
@media(hover:none){.actions{opacity:1}}

details.think{margin:0 0 8px;font-size:13px;color:var(--muted);border:1px dashed var(--line);border-radius:8px;padding:6px 10px}
details.think summary{cursor:pointer;color:var(--accent);list-style:none}
details.think summary::-webkit-details-marker{display:none}
details.think summary i{margin-right:6px}
details.think div{white-space:pre-wrap;margin-top:6px;max-height:260px;overflow-y:auto}
.cursor>div:last-child>:last-child::after,.cursor>div:last-child:empty::after{content:"▍";animation:b 1s steps(2) infinite;color:var(--accent);margin-left:2px}
@keyframes b{50%{opacity:0}}
.err{color:var(--danger)}
.typing{display:flex;align-items:center;gap:4px;min-height:27px}
.typing i{display:block;width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.7;animation:dot 1s infinite}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes dot{50%{opacity:.2;transform:translateY(-3px)}}
@keyframes rise{from{opacity:0;transform:translateY(8px)}}

/* 推荐问题 */
.chips{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:4px 0 18px 42px}
.chips button{display:flex;align-items:center;gap:10px;text-align:left;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px;cursor:pointer;transition:all .2s;animation:rise .35s both}
.chips button:nth-child(2){animation-delay:.07s}.chips button:nth-child(3){animation-delay:.14s}.chips button:nth-child(4){animation-delay:.21s}
.chips button:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 16px var(--glow)}
.research .chips button:hover{border-color:var(--ochre)}
.research .chips .ic{background:var(--ochre-soft);color:var(--ochre)}
.chips .ic{flex:none;width:32px;height:32px;border-radius:9px;display:flex;align-items:center;justify-content:center;background:var(--accent-soft);color:var(--accent)}
.chips b{display:block;font-weight:500;color:var(--head);font-size:14px}
.chips small{display:block;color:var(--muted);font-size:12px;margin-top:1px}

/* 输入区 */
footer{padding:10px 18px 12px;background:var(--panel)}
form{display:flex;gap:8px;align-items:flex-end;border:1px solid var(--line);border-radius:16px;padding:6px 6px 6px 10px;background:var(--bg);transition:border-color .2s,box-shadow .2s}
form:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
textarea{flex:1;border:0;outline:0;resize:none;background:transparent;color:var(--text);font:inherit;max-height:160px;padding:7px 4px;line-height:1.5}
textarea::placeholder{color:var(--muted)}
#send{flex:none;width:40px;height:40px;border-radius:12px;border:0;color:#fff;background:var(--accent);cursor:pointer;transition:transform .15s,opacity .2s}
#send:hover{transform:translateY(-1px)}
#send:disabled{opacity:.45;cursor:not-allowed;transform:none}
footer p{margin:6px 0 0;text-align:center;font-size:12px;color:var(--muted)}

/* 代码框与公式 */
.codebox{margin:10px 0;border-radius:8px;overflow:hidden;border:1px solid var(--line);background:var(--code)}
.codehead{display:flex;justify-content:space-between;align-items:center;padding:5px 12px;font-size:12px;color:#94a3b8;background:rgba(148,163,184,.12);font-family:var(--mono)}
.codehead span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:#ef6a5b;box-shadow:13px 0 0 #f5c451,26px 0 0 #48c79a;margin-right:44px;vertical-align:middle}
.codehead .copy{background:none;border:1px solid rgba(148,163,184,.4);color:#cbd5e1;border-radius:4px;padding:1px 8px;font-size:12px;cursor:pointer}
.codehead .copy:hover{border-color:#9fbfdc;color:#fff}
.math-block{margin:10px 0;padding:4px 0;overflow-x:auto;overflow-y:hidden;text-align:center}
.bubble .katex{font-size:1.05em;color:var(--head)}

/* 模式切换 */
.modes{display:flex;gap:8px;padding:0 18px 12px}
.modes button{flex:1;min-width:0;display:flex;align-items:center;gap:10px;text-align:left;background:var(--panel-2);color:var(--muted);border:1px solid transparent;border-radius:10px;padding:8px 12px;cursor:pointer;transition:all .2s}
.modes button>i{flex:none;width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;background:var(--panel);font-size:13px}
.modes b{display:block;font-weight:500;font-size:14px;color:var(--text)}
.modes small{display:block;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.modes button:hover{border-color:var(--line)}
.modes button.on{background:var(--panel);border-color:var(--accent);color:var(--muted);box-shadow:0 1px 6px var(--glow)}
.modes button.on>i{background:var(--accent-soft);color:var(--accent)}
.modes button[data-mode=research].on{border-color:var(--ochre)}
.modes button[data-mode=research].on>i{background:var(--ochre-soft);color:var(--ochre)}

/* 侧边栏 */
.side{flex:none;width:260px;display:flex;flex-direction:column;gap:16px;overflow-y:auto}
.blogger{align-items:center;padding:20px 16px;text-align:center}
.blogger img{width:96px;height:96px;object-fit:cover;border-radius:8px}
.blogger h3{margin:10px 0 0;font-size:18px;font-weight:500;color:var(--head)}
.blogger p{margin:2px 0 10px;font-size:13px;color:var(--muted)}
.social{display:flex;gap:6px}.social a{width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:4px;color:var(--text)}.social a:hover{background:var(--accent-soft);color:var(--accent)}
.links{padding:14px 16px}.links h4{margin:0 0 6px;font-size:15px;font-weight:500;color:var(--head)}.links h4 i{color:var(--accent);margin-right:6px}
.links a{padding:4px 0;color:var(--text);font-size:14px}.links a:hover{color:var(--accent)}
.tip{display:flex;gap:10px;align-items:flex-start;font-size:13px;color:var(--text);padding:5px 0;line-height:1.5}
.tip i{flex:none;width:24px;height:24px;border-radius:7px;display:flex;align-items:center;justify-content:center;background:var(--accent-soft);color:var(--accent);font-size:11px;margin-top:1px}

@media(max-width:900px){.side{display:none}}
@media(max-width:700px){.wrap{padding:8px}.nav-links span{display:none}.nav-links i{margin:0}.nav-links a,.nav-links button{padding:6px 9px}}
@media(max-width:600px){
  .modes{padding:0 12px 10px;gap:6px}.modes button{padding:7px 9px;gap:7px}.modes button>i{width:26px;height:26px}.modes small{display:none}
  .bar{padding:12px 12px 10px;gap:10px}.ai-avatar.lg{width:36px;height:36px;font-size:15px}
  .title h1{font-size:16px}.seg button{padding:5px 9px}.seg button span{display:none}
  .meters{padding:0 12px 10px;gap:12px}.mlabel{display:none}
  main{padding:16px 10px 6px}.u-avatar{display:none}.msg .col{max-width:calc(100% - 42px)}
  .chips{gap:8px;margin-left:0}.chips small{display:none}.chips button{padding:9px 10px}.chips .ic{width:28px;height:28px}
  footer{padding:8px 10px 10px}
}
.research #send{background:var(--ochre)}

/* 语言切换按钮 */
#langBtn{color:var(--accent);font-weight:600}