/* ===== 重置与基础 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;overflow:hidden}
body{
    font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    background:var(--bg);
    color:var(--text);
    transition:background .3s,color .3s;
}

/* ===== 应用骨架 ===== */
.app{display:flex;height:100%}

/* ===== 侧边栏 ===== */
.sb{
    width:var(--sb-w);
    background:var(--card);
    border-right:1px solid var(--border);
    display:flex;flex-direction:column;
    height:100%;flex-shrink:0;
    z-index:1000;
    transition:transform .3s,background .3s;
}
.sb-hdr{
    padding:10px 12px;
    border-bottom:1px solid var(--border);
    display:flex;align-items:center;justify-content:space-between;
}
.sb-hdr h1{font-size:15px;display:flex;align-items:center;gap:5px}
.sb-body{flex:1;overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:3px}
.sb-ft{padding:8px;border-top:1px solid var(--border)}

.badge{
    font-size:10px;color:var(--text2);
    padding:6px 9px;background:var(--pri-l);
    border-radius:6px;line-height:1.5;margin-bottom:5px;
}
.badge strong{color:var(--pri)}

.search{
    width:100%;padding:6px 9px;
    border:1px solid var(--border);border-radius:6px;
    font-size:12px;outline:none;
    background:var(--bg);margin-bottom:5px;color:var(--text);
}
.search:focus{border-color:var(--pri)}

.cl{list-style:none}
.ci{
    padding:7px 9px;border-radius:6px;cursor:pointer;
    font-size:12px;display:flex;align-items:center;gap:5px;
    margin-bottom:1px;transition:background .1s;
}
.ci:hover{background:var(--pri-l)}
.ci.act{background:var(--pri-l);color:var(--pri);font-weight:600}
.ci .ct{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ci .ia{display:none;gap:2px}
.ci:hover .ia{display:flex}
.ci .ia button{
    background:none;border:none;cursor:pointer;
    font-size:12px;padding:2px 3px;border-radius:3px;color:var(--text2);
}
.ci .ia button:hover{color:var(--err)}
.sl{font-size:9px;color:var(--text2);padding:5px 9px 2px;font-weight:600;text-transform:uppercase}

/* 移动端侧边栏 */
@media(max-width:768px){
    .sb{position:fixed;left:0;top:0;height:100%;transform:translateX(-100%)}
    .sb.open{transform:translateX(0)}
    .sb-ov{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:999}
    .sb-ov.show{display:block}
}

/* ===== 主内容区 ===== */
.main{
    flex:1;display:flex;flex-direction:column;
    height:100%;min-width:0;overflow:hidden;
    position:relative;
}
.hdr{
    height:var(--hdr);min-height:var(--hdr);
    border-bottom:1px solid var(--border);
    display:flex;align-items:center;
    padding:0 12px;gap:8px;
    background:var(--card);
    flex-shrink:0;transition:background .3s;
}
.menu-btn{display:none;background:none;border:none;font-size:20px;cursor:pointer;color:var(--text2);padding:4px}
@media(max-width:768px){.menu-btn{display:block}}
.title-in{
    flex:1;border:none;outline:none;
    font-size:15px;font-weight:600;
    background:transparent;color:var(--text);min-width:0;
}
.hdr-acts{display:flex;gap:2px;flex-shrink:0}
.hdr-acts button{
    background:none;border:none;font-size:15px;cursor:pointer;
    padding:4px;border-radius:5px;color:var(--text2);
}
.hdr-acts button:hover{background:var(--pri-l);color:var(--pri)}

/* ===== 消息区 ===== */
.msgs{flex:1;overflow-y:auto;padding:16px 20px;min-height:0}
@media(max-width:768px){.msgs{padding:12px 8px}}
.lm{text-align:center;margin-bottom:14px}
.lm button{
    background:var(--pri-l);border:none;color:var(--pri);
    padding:5px 14px;border-radius:14px;font-size:12px;cursor:pointer;
}
.msg{display:flex;gap:10px;margin-bottom:20px;align-items:flex-start}
.msg.user{flex-direction:row-reverse}
.av{
    width:30px;height:30px;border-radius:50%;
    display:flex;align-items:center;justify-content:center;
    font-size:14px;flex-shrink:0;
}
.msg.assistant .av{background:#e8f5e9}
.msg.user .av{background:#e3f2fd}
.m,.mb{min-width:40px;max-width:min(85%,900px)}

.bub{
    padding:10px 14px;border-radius:14px;
    line-height:1.75;font-size:14px;
    word-break:break-word;position:relative;
}
.bub.streaming{white-space:pre-wrap;font-family:inherit}
.msg.assistant .bub{
    background:var(--card);
    border-top-left-radius:4px;
    box-shadow:0 1px 3px rgba(0,0,0,.06);
}
.msg.user .bub{
    background:#d1e7ff;
    border-top-right-radius:4px;
    white-space:pre-wrap;
}

/* Markdown 渲染 */
.msg.assistant .bub p{margin-bottom:.6em}
.msg.assistant .bub p:last-child{margin-bottom:0}
.msg.assistant .bub pre{
    background:var(--code-bg);border-radius:8px;
    padding:12px;overflow-x:auto;margin:8px 0;
    font-size:13px;line-height:1.5;position:relative;
}
.msg.assistant .bub code{font-family:'SF Mono',Monaco,Consolas,monospace;font-size:13px}
.msg.assistant .bub code:not([class]){
    background:var(--code-bg);padding:1px 5px;
    border-radius:3px;font-size:12px;
}
.msg.assistant .bub ul,.msg.assistant .bub ol{padding-left:1.5em;margin:.4em 0}
.msg.assistant .bub li{margin-bottom:.3em}
.msg.assistant .bub blockquote{
    border-left:3px solid var(--pri);
    padding-left:12px;margin:.5em 0;color:var(--text2);
}
.msg.assistant .bub img{max-width:100%;border-radius:8px;cursor:pointer;transition:transform .2s}
.msg.assistant .bub img:hover{transform:scale(1.02)}
.msg.assistant .bub a{color:var(--pri);text-decoration:underline}
.msg.assistant .bub a:hover{opacity:.8}
.msg.assistant .bub mark{background:rgba(255,230,0,.3);padding:1px 3px;border-radius:2px}
.msg.assistant .bub table{
    border-collapse:collapse;margin:8px 0;font-size:13px;
    display:block;overflow-x:auto;max-width:100%;
}
.msg.assistant .bub th,.msg.assistant .bub td{
    border:1px solid var(--border);padding:6px 10px;text-align:left;
}
.msg.assistant .bub th{background:var(--pri-l);font-weight:600}
.msg.assistant .bub .task-list-item input{margin-right:6px}
.msg.assistant .bub hr{border:none;border-top:1px solid var(--border);margin:12px 0}
.msg.assistant .bub sup,.msg.assistant .bub sub{font-size:0.75em}
.msg.assistant .bub .footnotes{
    font-size:12px;color:var(--text2);
    border-top:1px solid var(--border);
    margin-top:12px;padding-top:8px;
}

/* 代码块包装 */
.code-wrap{position:relative;margin:8px 0}
.code-wrap pre{margin:0!important}
.code-lang{
    position:absolute;top:6px;left:12px;
    font-size:10px;color:var(--text2);font-weight:600;
    text-transform:uppercase;pointer-events:none;
}
.code-copy-top{
    position:absolute;top:6px;right:8px;
    background:var(--card);border:1px solid var(--border);
    border-radius:5px;padding:2px 8px;font-size:11px;
    cursor:pointer;color:var(--text2);transition:all .15s;z-index:1;
}
.code-copy-top:hover{color:var(--pri);border-color:var(--pri)}
.code-copy-bottom{display:flex;justify-content:flex-end;margin-top:4px}
.code-copy-bottom button{
    background:var(--card);border:1px solid var(--border);
    border-radius:5px;padding:3px 10px;font-size:11px;
    cursor:pointer;color:var(--text2);transition:all .15s;
}
.code-copy-bottom button:hover{color:var(--pri);border-color:var(--pri)}
.code-collapsed pre{max-height:200px;overflow:hidden}
.code-collapsed::after{
    content:'';position:absolute;bottom:28px;
    left:0;right:0;height:40px;
    background:linear-gradient(transparent,var(--code-bg));
    pointer-events:none;
}
.code-toggle{text-align:center;margin-top:4px}
.code-toggle button{
    background:var(--pri-l);border:none;color:var(--pri);
    padding:3px 12px;border-radius:10px;font-size:11px;cursor:pointer;
}

.mermaid-wrap{
    background:var(--card);border-radius:8px;padding:16px;
    margin:8px 0;overflow-x:auto;text-align:center;
}
.katex-display{margin:.8em 0;overflow-x:auto;overflow-y:hidden}
.katex{font-size:1.1em}

/* 消息附件徽章 */
.mf{margin-bottom:4px}
.fb{
    display:inline-flex;align-items:center;gap:3px;
    padding:2px 7px;background:var(--pri-l);
    border-radius:4px;font-size:11px;color:var(--pri);
    margin-right:3px;margin-bottom:2px;
}

/* 消息底部操作栏 */
.mm{
    display:flex;align-items:center;gap:5px;
    margin-top:5px;font-size:11px;color:var(--text2);flex-wrap:wrap;
}
.msg.user .mm{justify-content:flex-end}
.mm button{
    background:none;border:none;color:var(--text2);
    cursor:pointer;font-size:11px;padding:2px 5px;border-radius:3px;
}
.mm button:hover{background:var(--pri-l);color:var(--pri)}
.msg-time{font-size:10px;color:var(--text2);opacity:.7}

/* 空状态 */
.empty{
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    height:100%;color:var(--text2);gap:8px;
}
.empty .ico{font-size:42px}
.empty p{font-size:14px}

/* ===== 拖拽遮罩 ===== */
.drop-mask{
    display:none;position:absolute;inset:0;
    background:rgba(102,126,234,.15);
    border:3px dashed var(--pri);
    z-index:500;align-items:center;justify-content:center;
    pointer-events:none;
}
.drop-mask.show{display:flex}
.drop-mask-inner{
    background:var(--card);
    padding:24px 36px;border-radius:16px;
    text-align:center;color:var(--pri);
    box-shadow:0 8px 32px rgba(0,0,0,.15);
}

/* ===== 输入区 ===== */
.inp-area{
    border-top:1px solid var(--border);
    padding:10px 20px;
    padding-bottom:max(10px,env(safe-area-inset-bottom));
    background:var(--card);
    flex-shrink:0;transition:background .3s;
}
@media(max-width:768px){.inp-area{padding:8px;padding-bottom:max(8px,env(safe-area-inset-bottom))}}
.inp-wrap{display:flex;gap:8px;align-items:flex-end}
.att-btn{
    width:38px;height:38px;border-radius:10px;
    border:1px solid var(--border);background:var(--card);
    font-size:17px;cursor:pointer;
    display:flex;align-items:center;justify-content:center;
    flex-shrink:0;color:var(--text);
}
.att-btn:hover{border-color:var(--pri);color:var(--pri)}
.att-btn.has{border-color:var(--pri);background:var(--pri-l);color:var(--pri)}
.inp-box{flex:1;min-width:0}
.inp-box textarea{
    width:100%;border:1px solid var(--border);
    border-radius:12px;padding:9px 14px;
    font-size:14px;resize:none;outline:none;
    min-height:38px;max-height:130px;line-height:1.5;
    font-family:inherit;background:var(--bg);color:var(--text);
}
.inp-box textarea:focus{border-color:var(--pri)}
.send{
    width:38px;height:38px;border-radius:10px;
    background:var(--pri);color:#fff;border:none;
    font-size:17px;cursor:pointer;
    display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.send:hover{background:var(--pri-h)}
.send.stop{background:var(--err)}

/* ===== 附件面板 ===== */
.att-pan{
    display:none;position:absolute;
    bottom:46px;left:0;
    background:var(--card);border:1px solid var(--border);
    border-radius:12px;padding:12px;
    box-shadow:0 8px 24px rgba(0,0,0,.12);
    width:300px;z-index:100;
}
.att-pan.show{display:block}
.att-list{display:flex;flex-direction:column;gap:4px;max-height:180px;overflow-y:auto;margin-top:6px}
.att-item{
    display:flex;align-items:center;gap:6px;
    padding:5px 8px;background:var(--bg);
    border:1px solid var(--border);border-radius:6px;font-size:11px;
}
.att-item .ai-nm{
    flex:1;overflow:hidden;text-overflow:ellipsis;
    white-space:nowrap;color:var(--text);
}
.att-item .ai-sz{color:var(--text2);font-size:10px;flex-shrink:0}
.att-item .ai-rm{
    background:none;border:none;color:var(--err);
    cursor:pointer;font-size:14px;padding:0 2px;flex-shrink:0;
}
.att-item .ai-rm:hover{opacity:.7}
.att-head{
    display:flex;justify-content:space-between;align-items:center;
    margin-top:6px;font-size:11px;color:var(--text2);
}
.att-head button{
    background:none;border:none;color:var(--err);
    cursor:pointer;font-size:11px;padding:2px 5px;
}
.att-head button:hover{text-decoration:underline}

/* ===== 通用按钮 ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:4px;
    padding:7px 14px;border:1px solid var(--border);
    border-radius:8px;background:var(--card);color:var(--text);
    font-size:13px;cursor:pointer;transition:all .12s;white-space:nowrap;
}
.btn:hover{border-color:var(--pri);color:var(--pri)}
.btn-p{background:var(--pri);color:#fff;border-color:var(--pri)}
.btn-p:hover{background:var(--pri-h)}
.btn-d{color:var(--err);border-color:var(--err)}
.btn-d:hover{background:var(--err);color:#fff}
.btn-s{padding:5px 10px;font-size:12px}
.btn-b{width:100%}

/* ===== 模态框 ===== */
.mo{
    display:none;position:fixed;inset:0;
    background:rgba(0,0,0,.5);z-index:2000;
    align-items:center;justify-content:center;padding:12px;
}
.mo.show{display:flex}
.md{
    background:var(--card);border-radius:16px;
    width:100%;max-width:540px;max-height:82vh;
    overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.15);
}
.md-h{
    padding:18px 20px 0;
    display:flex;align-items:center;justify-content:space-between;
    position:sticky;top:0;background:var(--card);
    z-index:1;border-radius:16px 16px 0 0;
}
.md-h h2{font-size:16px}
.md-x{
    background:none;border:none;font-size:22px;
    cursor:pointer;color:var(--text2);
}
.md-b{padding:16px 20px 20px}

/* ===== 表单 ===== */
.fg{margin-bottom:14px}
.fg label{
    display:block;font-size:12px;font-weight:600;
    color:var(--text2);margin-bottom:5px;
}
.fg input,.fg textarea,.fg select{
    width:100%;border:1px solid var(--border);
    border-radius:8px;padding:9px 12px;
    font-size:13px;outline:none;font-family:inherit;
    background:var(--bg);color:var(--text);
}
.fg input:focus,.fg textarea:focus,.fg select:focus{border-color:var(--pri)}
.fr{display:flex;gap:8px}
.fr .fg{flex:1}
.pt{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.pt input[type="checkbox"]{width:15px;height:15px;accent-color:var(--pri)}
.pt label{margin:0;font-size:13px;font-weight:500;color:var(--text)}
.ps{margin-bottom:12px;padding-left:23px}
.ps input[type="range"]{width:100%;accent-color:var(--pri)}
.ps .pv{font-size:12px;color:var(--pri);font-weight:600}

.presets{display:flex;flex-wrap:wrap;gap:5px;margin-top:5px}
.presets button{
    padding:4px 8px;font-size:11px;
    border:1px solid var(--border);border-radius:6px;
    background:var(--card);cursor:pointer;color:var(--text);
}
.presets button:hover{border-color:var(--pri);color:var(--pri);background:var(--pri-l)}

.tabs{display:flex;gap:4px;margin-bottom:12px;flex-wrap:wrap}
.tab{
    padding:6px 12px;border:none;background:transparent;
    font-size:13px;cursor:pointer;border-radius:7px;color:var(--text2);
}
.tab.act{background:var(--pri-l);color:var(--pri);font-weight:600}

/* ===== Toast ===== */
.tc{
    position:fixed;top:14px;right:14px;z-index:9999;
    display:flex;flex-direction:column;gap:7px;
    pointer-events:none;
}
.tt{
    padding:10px 16px;border-radius:10px;
    background:var(--card);box-shadow:0 4px 14px rgba(0,0,0,.12);
    font-size:13px;animation:si .3s;max-width:300px;pointer-events:auto;
}
.tt.ok{border-left:4px solid var(--ok)}
.tt.er{border-left:4px solid var(--err)}
@keyframes si{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* ===== 滚动条 ===== */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}

/* ===== 灯箱 ===== */
.lightbox{
    display:none;position:fixed;inset:0;
    background:rgba(0,0,0,.85);z-index:3000;
    align-items:center;justify-content:center;cursor:zoom-out;
}
.lightbox.show{display:flex}
.lightbox img{max-width:92vw;max-height:92vh;border-radius:8px}