:root{font-family:Inter,"Microsoft YaHei","PingFang SC",sans-serif;color:#192c3b;background:#f4f7fa;font-size:16px;line-height:1.6;--accent:#176754;--line:#dfe7eb;--muted:#697d8a}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{touch-action:manipulation}button{cursor:pointer;border:0}button:disabled{cursor:wait;opacity:.55}button:focus-visible,a:focus-visible{outline:3px solid #50aa97;outline-offset:4px}input:focus,textarea:focus{outline:2px solid #62b19f;outline-offset:1px}a{color:inherit;text-decoration:none}[hidden]{display:none!important}.primary{background:var(--accent);color:white;border-radius:8px;padding:11px 21px;font-weight:600;white-space:nowrap}.primary:hover{background:#105141}.text-button{background:none;color:var(--accent);padding:8px}.brand{font-size:26px;font-weight:800;letter-spacing:3px;display:flex;align-items:center;gap:13px}.brand span{font-size:10px;letter-spacing:2px;font-weight:500;border-left:1px solid currentColor;padding-left:13px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:700;color:var(--muted)}.auth-shell{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.intro{background:#153f39;color:#f2f8f5;padding:48px 12%;display:flex;flex-direction:column;justify-content:space-between;min-height:100vh}.intro .eyebrow{color:#a4cec1}.intro h1{font-size:clamp(36px,4vw,62px);line-height:1.35;letter-spacing:1px;margin:25px 0}.intro p{color:#c0d6ce;font-size:18px}.intro-line{height:1px;background:#4c7167;width:76px;margin:38px 0 22px}.intro .privacy,.intro-foot{font-size:14px;color:#9cbdb2}.auth-panel{display:grid;place-items:center;padding:40px}.auth-card{width:100%;max-width:360px}.auth-card h2{font-size:30px;margin:12px 0 4px}.auth-card p{color:var(--muted);margin-top:0}.auth-card label{display:block;margin-top:22px;font-size:14px;font-weight:600}.auth-card input{display:block;width:100%;border:1px solid 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30px;min-width:0}.editor-top,.editor-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:var(--muted)}.danger{background:none;color:#ac4848;font-size:13px;padding:5px}.editor>input{border:0;font-size:25px;font-weight:600;margin-top:24px;width:100%;padding:8px 0;color:#233e4b}.editor textarea{border:0;width:100%;resize:vertical;flex:1;min-height:280px;margin:15px 0 20px;line-height:1.9;color:#425965}.editor-bottom{border-top:1px solid #edf0f3;padding-top:18px}.empty{padding:45px 20px;text-align:center;color:var(--muted);font-size:14px;border:1px dashed #cfdbdf;border-radius:10px}.empty strong{display:block;font-size:17px;color:#3a555f;margin-bottom:8px}.upload-box{text-align:center;background:white;border:1px dashed #a3bdb5;border-radius:12px;padding:28px}.upload-symbol{display:inline-grid;place-items:center;width:40px;height:40px;background:#e5f2ec;border-radius:10px;color:#176754;font-size:24px}.upload-box h2{font-size:18px;margin:12px 0 5px}.upload-box p{font-size:14px;color:var(--muted)}.upload-box small{display:block;margin-top:20px;color:var(--muted);font-size:12px}.file-picker{font-size:14px;margin:12px;display:inline-block}.file-picker input{display:block;max-width:100%;margin-top:6px;font-size:14px}.file-list{display:grid;gap:10px;margin-top:25px}.file-row{background:white;border:1px solid var(--line);border-radius:9px;padding:16px 22px;display:flex;align-items:center;gap:14px}.file-row .file-info{flex:1;min-width:0}.file-info strong{display:block;overflow-wrap:anywhere;font-size:15px}.file-info small{font-size:12px;color:var(--muted)}.file-row a{font-size:14px;color:var(--accent)}.badge{font-size:12px;background:#e6eded;border-radius:20px;padding:6px 12px;color:#547069}.ai-layout{border:1px solid var(--line);border-radius:12px;background:white;overflow:hidden}.chat-list{height:46vh;min-height:260px;overflow:auto;padding:26px}.chat-list .empty{border:0;padding:65px 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span{display:none}.panel{padding:28px 24px}.topbar{padding:0 24px}.note-layout{grid-template-columns:210px 1fr;gap:15px}.editor{padding:20px}.editor-bottom span{max-width:130px}.intro{padding:40px 10%}}@media(max-width:760px){.auth-shell{grid-template-columns:1fr}.intro{min-height:auto;padding:25px}.intro>div,.intro-foot{display:none}.auth-panel{padding:45px 25px}.workspace{display:block}.sidebar{position:static;height:auto;padding:18px;border-right:0;border-bottom:1px solid var(--line);gap:16px}.sidebar .brand span{display:block}.nav-label{display:none}nav{display:flex;gap:5px}nav button{padding:8px 12px;font-size:14px}nav button span{font-size:18px;margin-right:6px}.sidebar-bottom{position:absolute;right:15px;top:17px;margin:0;padding:0;border:0}.sidebar-bottom .avatar,.sidebar-bottom small{display:none}.topbar{height:55px;padding:0 20px;font-size:12px}.panel{padding:25px 18px}.page-heading{align-items:flex-start;gap:12px}.page-heading h1{font-size:26px}.page-heading 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