:root{--bg:#f3f7f5;--card:#fff;--ink:#132522;--muted:#71817d;--line:#dbe7e2;--green:#075e54;--mint:#d9f1e8;--bubble:#fff;--mine:#dcf8c6;--shadow:0 18px 50px #173a3210}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(22px,calc((100% - 1100px)/2));background:var(--card);border-bottom:1px solid var(--line)}.brand{display:flex;gap:11px;align-items:center}.brand-mark{display:grid;place-items:center;width:35px;height:35px;border-radius:11px;background:var(--green);color:#fff;font-size:27px;line-height:1}.brand strong,.brand small{display:block}.brand strong{letter-spacing:-.02em}.brand small{color:var(--muted);font-size:11px}.icon-btn,.secondary{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:10px;padding:9px 13px;cursor:pointer}.icon-btn{font-size:18px;padding:6px 11px}.shell{max-width:1100px;margin:0 auto;padding:52px 22px 40px}.card{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.welcome{max-width:720px;margin:35px auto;padding:clamp(28px,7vw,68px);text-align:center}.eyebrow{color:var(--green);font-size:11px;font-weight:800;letter-spacing:.16em}.welcome h1{font-size:clamp(38px,7vw,76px);line-height:.98;letter-spacing:-.07em;margin:14px 0 22px}.welcome h1 em{color:var(--green);font-style:normal}.welcome p{max-width:550px;margin:0 auto 30px;color:var(--muted);font-size:16px}.dropzone{position:relative;display:flex;flex-direction:column;align-items:center;gap:5px;padding:28px 18px;border:1.5px dashed #91b8aa;border-radius:16px;background:#f8fcfa;color:var(--green);cursor:pointer;transition:.2s}.dropzone:hover,.dropzone.over{background:var(--mint);transform:translateY(-2px)}.dropzone input{display:block;position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}.upload-btn{display:block;width:100%;margin:12px 0 0;border:0;border-radius:12px;padding:13px 18px;background:var(--green);color:#fff;font-weight:800;letter-spacing:.08em;cursor:pointer;transition:.2s}.upload-btn:hover:not(:disabled){filter:brightness(1.08);transform:translateY(-1px)}.upload-btn:disabled{opacity:.4;cursor:not-allowed}.upload-icon{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--green);color:#fff;font-size:25px}.dropzone small,.privacy small{color:var(--muted);font-size:12px}.privacy{display:flex;gap:12px;align-items:flex-start;text-align:left;background:#f5f8f7;border-radius:13px;margin-top:18px;padding:13px 15px}.privacy span{color:var(--green);font-size:24px}.privacy b,.privacy small{display:block}.hidden{display:none!important}.chat-head{display:flex;align-items:center;justify-content:space-between;padding:22px 26px;margin-bottom:12px}.chat-head h2{margin:3px 0 1px;letter-spacing:-.04em}.muted{color:var(--muted);font-size:13px}.toolbar{display:flex;gap:10px;padding:12px;margin-bottom:18px;position:sticky;top:10px;z-index:2}.search{display:flex;align-items:center;gap:10px;flex:1;background:var(--bg);border-radius:11px;padding:0 13px;color:var(--muted)}.search input{border:0;outline:0;background:transparent;width:100%;padding:11px 0;color:var(--ink);font:inherit}.messages{min-height:400px;padding:8px 4px 30px;background:linear-gradient(135deg,#e6f1ed 0,#f5f8f7 100%);border-radius:18px}.day{display:flex;justify-content:center;margin:20px 0 11px}.day span{background:#fff7bd;color:#6d6632;border-radius:7px;padding:3px 10px;font-size:11px;box-shadow:0 2px 8px #0000000b}.message{max-width:min(680px,86%);margin:6px 12px;padding:8px 11px 6px;background:var(--bubble);border-radius:4px 12px 12px 12px;box-shadow:0 1px 2px #0001;white-space:pre-wrap;overflow-wrap:anywhere}.message.mine{margin-left:auto;background:var(--mine);border-radius:12px 4px 12px 12px}.sender{font-size:11px;font-weight:800;color:var(--green);margin-bottom:2px}.text{font-size:14px}.attachment{display:flex;flex-direction:column;gap:5px;margin-top:8px;max-width:420px;color:var(--muted);font-size:11px}.attachment img,.attachment video,.attachment iframe{display:block;width:100%;max-height:360px;object-fit:cover;border-radius:9px;background:#d8e5e0}.attachment iframe{height:300px;border:0}.attachment audio{width:100%;height:38px}.pdf-card{display:flex;align-items:center;gap:11px;padding:10px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}.pdf-thumb{display:grid;place-items:end center;width:50px;height:62px;flex:0 0 50px;border-radius:5px 5px 8px 8px;background:#fff;color:#c92f3c;font-size:10px;font-weight:900;box-shadow:0 1px 4px #0002;position:relative;overflow:hidden}.pdf-thumb:before{content:'';position:absolute;top:0;right:0;border-style:solid;border-width:0 15px 15px 0;border-color:transparent #f2c6ca transparent transparent}.pdf-thumb span{width:100%;padding:4px 2px;text-align:center;background:#c92f3c;color:#fff}.pdf-info{min-width:0;display:flex;flex-direction:column;gap:3px}.pdf-info b{font-size:12px;overflow-wrap:anywhere}.pdf-info small{color:var(--muted);font-size:10px}.pdf-actions{display:flex;gap:10px;font-size:11px}.pdf-actions a{color:var(--green);font-weight:700;text-decoration:none}.audio-attachment{background:#f2f7f4;border-radius:9px;padding:8px 10px}.file-attachment{display:block;text-decoration:none;background:#f2f7f4;border-radius:9px;padding:10px;color:var(--green);font-weight:700}.time{float:right;color:#83928e;font-size:10px;margin:5px 0 0 14px}.notice{padding:12px 15px;border-radius:12px;background:#fff3cd;color:#6d5720;margin-bottom:15px;font-size:13px}footer{max-width:1100px;margin:0 auto;padding:0 22px 30px;color:var(--muted);font-size:11px;display:flex;justify-content:space-between}@media(max-width:650px){.shell{padding-top:20px}.welcome{margin-top:12px}.chat-head{align-items:flex-start;gap:12px}.chat-head .secondary{white-space:nowrap;font-size:12px}.toolbar{top:0}.toolbar .secondary{display:none}}body.dark{--bg:#101917;--card:#17221f;--ink:#eff8f4;--muted:#9aada6;--line:#2a3b36;--mint:#203c35;--bubble:#24332f;--mine:#1d4939}body.dark .dropzone,body.dark .privacy,body.dark .search{background:#1d2c28}body.dark .messages{background:linear-gradient(135deg,#172c27,#13201d)}body.dark .day span{background:#4d4a2c;color:#fff3b0}body.dark .topbar{background:var(--card)}.viewer-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px}.file-panel{padding:14px;position:sticky;top:10px;align-self:start;max-height:calc(100vh - 30px);overflow:auto}.file-panel-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}.file-list{display:flex;flex-direction:column;gap:6px}.file-item{display:flex;align-items:center;gap:8px;width:100%;padding:9px;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink);text-align:left;cursor:pointer;font:12px inherit;overflow-wrap:anywhere}.file-item:hover{background:var(--mint)}.file-kind{flex:0 0 auto;color:var(--green);font-size:9px;font-weight:800}.message-foot{display:flex;justify-content:flex-end;clear:both;min-height:15px}.time{float:none;display:block;color:#687a74;font-size:10px;margin:5px 0 0 14px;line-height:1.2}.text a{color:var(--green);text-decoration:underline;overflow-wrap:anywhere}.mobile-files-btn,.mobile-files-menu{display:none}@media(max-width:850px){.viewer-grid{display:block}.file-panel{display:none}.mobile-files-btn{display:flex;position:fixed;z-index:5;right:16px;bottom:16px;border:1px solid var(--line);border-radius:999px;padding:12px 16px;background:var(--green);color:#fff;box-shadow:0 8px 24px #0003;font-weight:800;cursor:pointer}.mobile-files-menu{display:block;position:fixed;z-index:6;left:12px;right:12px;bottom:12px;max-height:70vh;overflow:auto;padding:16px;background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:0 14px 40px #0005}.mobile-files-menu .secondary{padding:5px 9px;font-size:11px}}.floating-actions{position:fixed;z-index:5;left:22px;bottom:20px;display:flex;gap:8px;align-items:center}.floating-actions button{border:1px solid #ffffff44;border-radius:999px;padding:11px 15px;color:#fff;font:700 12px inherit;cursor:pointer;box-shadow:0 8px 24px #0003;transition:.2s}.floating-actions button:hover{transform:translateY(-2px);filter:brightness(1.08)}.floating-close{background:#8f3440}.floating-jump{background:var(--green)}@media(max-width:850px){.floating-actions{left:16px;bottom:16px}.floating-actions button{padding:10px 13px;font-size:11px}.mobile-files-btn{right:16px;bottom:16px}}