:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#263449;background:#edf1f7;font-synthesis:none;--accent:#2563eb;--muted:#64748b;--line:#e2e8f0}*{box-sizing:border-box}body{margin:0}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}[hidden]{display:none!important}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #7ca3f3;outline-offset:3px}.shell{max-width:1440px;height:100dvh;min-height:560px;max-height:1100px;margin:0 auto;display:grid;grid-template-columns:340px minmax(0,1fr);background:#ffffff}.sidebar{background:#f3f6fb;border-right:1px solid var(--line);padding:42px 38px 30px;position:relative;display:flex;flex-direction:column;overflow:hidden}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:inherit;font-size:23px;font-weight:650;letter-spacing:1px}.brand-mark{display:grid;place-items:center;background:#2563eb;color:#fff;border-radius:14px;width:44px;height:44px;font:65px Georgia;padding-top:8px}.brand small{display:block;font-size:8px;letter-spacing:1.6px;color:#64748b;margin-top:5px}.intro{margin-top:70px}.eyebrow{font-size:10px;letter-spacing:2.2px;color:#64748b;font-weight:650}.intro h1{font-size:44px;line-height:1.5;letter-spacing:2px;font-weight:550;margin:18px 0}.intro p{color:#64748b;line-height:2.2;font-size:13px}.little-art{position:relative;height:170px;margin-top:25px}.bubble{position:absolute;border-radius:20px;padding:18px 24px;font-size:16px;box-shadow:0 6px 10px #58634f05}.bubble-one{left:0;top:10px;background:#fff;transform:rotate(-7deg);color:#66735f}.bubble-two{right:3px;top:80px;background:#dce2d3;transform:rotate(7deg)}.bubble i{position:absolute;bottom:-9px;left:20px;width:20px;height:20px;background:inherit;clip-path:polygon(0 0,100% 0,0 100%)}.art-star{position:absolute;right:15px;top:5px;font-size:36px;color:#c18c68}.art-dot{position:absolute;width:8px;height:8px;border-radius:50%;background:#b0baa5;left:40px;bottom:0}.side-bottom{margin-top:auto;padding-top:28px;font-size:11px;color:#64748b;letter-spacing:.5px}.tiny-dot{display:inline-block;width:6px;height:6px;background:#84947b;border-radius:50%;margin-right:7px}.side-bottom small{display:block;margin:10px 0 0 15px;font-size:10px;color:#94a3b8}.main{display:flex;flex-direction:column;min-width:0;min-height:0}.topbar{height:104px;flex-shrink:0;padding:24px 38px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.room-heading{display:flex;gap:13px;align-items:center}.avatar{width:42px;height:42px;display:grid;place-items:center;background:#e8effd;color:#2563eb;border-radius:50%;font-size:16px}.room-heading h2{font-size:16px;font-weight:600;margin:0 0 8px}.room-heading p{font-size:11px;color:#64748b;margin:0}.status-dot{display:inline-block;width:5px;height:5px;background:#6b91cc;border-radius:50%;margin-right:6px}.header-actions{display:flex;gap:9px}.button{border:0;display:inline-flex;align-items:center;justify-content:center;gap:25px;min-height:43px;border-radius:9px;padding:11px 18px;font-size:12px;transition:background .15s,transform .15s}.button:active{transform:translateY(1px)}.primary{background:var(--accent);color:white}.primary:hover{background:#1d4ed8}.secondary{background:#edf2fb;color:#365785}.text-button{color:#64748b;background:transparent;font-size:11px}.icon-button{border:0;background:none;color:#64748b;font-size:25px}.welcome{flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:35px 20px}.welcome-icon{width:76px;height:76px;display:grid;place-items:center;background:#f0f4fa;border:7px solid #f6f8fc;border-radius:26px;font-size:44px;color:#2563eb;transform:rotate(-8deg);margin-bottom:30px}.welcome h2{font-size:26px;font-weight:550;letter-spacing:1px;margin:17px 0 12px}.welcome>p{font-size:13px;line-height:2;color:#64748b;margin:0 0 27px}.welcome .primary{padding:15px 26px;font-size:13px}.features{display:flex;gap:28px;font-size:11px;color:#8d9586;margin:28px 0}.features span:before{content:'✓';margin-right:7px;color:#93a089}.welcome .privacy-note{font-size:10px;line-height:1.8;color:#8391a4;margin:0}.footer{flex-shrink:0;border-top:1px solid var(--line);padding:19px 38px;display:flex;justify-content:space-between;font-size:10px;color:#8391a4}.footer span{font-size:8px;letter-spacing:1.5px}.chat{display:flex;flex-direction:column;flex:1;min-height:0}.room-note{padding:14px 20px;text-align:center;font-size:10px;color:#8391a4}.messages{flex:1;overflow-y:auto;padding:10px 32px 24px;scroll-behavior:smooth;overscroll-behavior:contain}.empty{text-align:center;margin:70px 0;color:#64748b}.empty>span{font-size:32px;color:#94a3b8}.empty h3{font-size:15px;font-weight:500}.empty p{font-size:11px;color:#8391a4}.message{display:flex;flex-direction:column;align-items:flex-start;margin:16px 0;animation:appear .2s ease}.message.mine{align-items:flex-end}.message-meta{font-size:10px;color:#8391a4;margin:0 5px 7px}.message-body{background:#f0f4fa;padding:12px 16px;border-radius:3px 14px 14px;max-width:78%;font-size:14px;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere;color:#334155;user-select:text}.mine .message-body{background:#e1ebff;border-radius:14px 3px 14px 14px}.message-body.media{padding:5px;white-space:normal;max-width:min(78%,350px)}.message-body img,.message-body video{display:block;max-width:100%;max-height:340px;border-radius:9px;object-fit:contain;background:#e8eef6}.message-body a{display:block;color:#526b8e;font-size:10px;padding:5px 7px;text-decoration:none}.composer{padding:0 32px 16px}.input-wrap{border:1px solid #dbe3ee;background:white;border-radius:14px;padding:14px}.input-wrap:focus-within{border-color:#7ca3f3;box-shadow:0 0 0 3px #b0bf9c0c}textarea{width:100%;resize:none;background:transparent;border:0;color:#334155;line-height:1.6;font-size:14px}textarea:focus{outline:0}textarea::placeholder{color:#94a3b8}#text{max-height:120px;min-height:42px}.compose-bottom{display:flex;justify-content:space-between;align-items:center}.attach-actions{display:flex;gap:18px}.attach-button{border:0;background:none;display:flex;align-items:center;gap:6px;color:#64748b;padding:7px 0;font-size:11px}.attach-button svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.4}.send{min-height:35px;padding:8px 15px;gap:17px}.compose-hint{display:flex;justify-content:space-between;font-size:9px;color:#94a3b8;margin-top:9px}.upload-status{padding:8px 33px;font-size:11px;color:#526b8e;display:flex;gap:15px;align-items:center}.upload-status progress{width:110px;accent-color:var(--accent)}dialog{border:1px solid #e2e8f0;border-radius:20px;max-width:440px;width:calc(100% - 32px);padding:36px;color:#334155;box-shadow:0 24px 100px #16201030}dialog::backdrop{background:#242d235c;backdrop-filter:blur(4px)}dialog h2{font-size:22px;font-weight:550}dialog p{font-size:12px;line-height:1.9;color:#64748b}dialog label{font-size:11px;display:block;margin:22px 0 8px;color:#64748b}dialog textarea{font-size:11px;background:#f3f6fa;border-radius:8px;padding:10px;overflow-wrap:anywhere}dialog .primary,dialog .secondary{width:100%;margin-top:12px}dialog small{font-size:10px;color:#94a3b8;display:block;line-height:1.7;margin-top:18px}.dialog-close{position:absolute;right:17px;top:13px;font-size:25px;border:0;background:none;color:#64748b}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);z-index:10;background:#334155;color:white;border-radius:10px;box-shadow:0 5px 25px #0002;padding:13px 20px;font-size:12px;max-width:90%;width:max-content}#older{display:flex;margin:0 auto}@keyframes appear{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media(min-height:950px){.intro{margin-top:100px}.little-art{margin-top:65px}}@media(min-width:1440px){body{padding:30px}.shell{height:calc(100dvh - 60px);border-radius:22px;overflow:hidden;box-shadow:0 20px 70px #555d4410}}@media(max-width:1000px){.shell{grid-template-columns:270px 1fr}.sidebar{padding:32px 26px}.intro h1{font-size:36px}.topbar{padding:20px 25px}.messages{padding:10px 20px 20px}.composer{padding:0 20px 14px}.welcome h2{font-size:23px}}@media(max-width:700px){.shell{display:flex;min-height:0;height:100dvh}.sidebar{display:none}.main{width:100%}.topbar{height:80px;padding:15px 18px}.room-heading h2{font-size:15px}.avatar{height:38px;width:38px}.header-actions .button{font-size:11px;padding:9px 12px;min-height:36px;gap:8px}.welcome{padding:25px 22px}.welcome h2{font-size:23px}.welcome-icon{margin-bottom:26px}.footer{padding:13px 20px calc(13px + env(safe-area-inset-bottom));font-size:9px}.chat~.footer{display:none}body.in-room .footer{display:none}.messages{padding:5px 16px 20px}.message-body{max-width:86%;font-size:15px}.composer{padding:0 12px calc(12px + env(safe-area-inset-bottom))}.compose-hint{font-size:8px}#keyboard-hint{display:none}.input-wrap{padding:11px 12px}.room-note{font-size:9px;padding:12px}.empty{margin-top:80px}.upload-status{padding:10px 18px}dialog{padding:30px 25px}.welcome .privacy-note{font-size:9px}.toast{bottom:100px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important;transition:none!important}}

.entry-links{display:flex;gap:12px;margin:0 0 32px}.entry-links a{text-decoration:none}.login-form{width:min(100%,320px);text-align:left;margin-bottom:24px}.login-form label{display:block;font-size:12px;color:#727e69;margin-bottom:9px}.login-form input{width:100%;border:1px solid #dce2d3;border-radius:10px;padding:14px;background:#fff;font:inherit;font-size:16px;color:#334155}.login-form input:focus{outline:2px solid #acbba0;outline-offset:2px}.login-form .primary{width:100%}.login-error{color:#b94735;font-size:12px;line-height:1.5;min-height:18px;margin:9px 0}.expired-attachment{color:#8a9182;font-size:12px}#leave{font-size:12px;padding:9px}.login-form+ .privacy-note{line-height:2}

/* Images open in an overlay; only the explicit viewer button downloads. */
.image-preview{display:block;padding:0;border:0;background:none;text-align:left;max-width:100%;color:inherit;cursor:zoom-in;border-radius:9px}
.image-preview[aria-busy="true"]{cursor:progress;opacity:.7}
.image-preview .media-caption{display:block;color:#526b8e;font-size:10px;line-height:1.6;padding:5px 7px;overflow-wrap:anywhere}
.viewing-image{overflow:hidden}
.chat-image-viewer{--pswp-bg:#111510;--pswp-icon-color:#fff;--pswp-icon-color-secondary:#111510;z-index:10000}
.chat-image-viewer .pswp__top-bar{padding-top:env(safe-area-inset-top)}
.chat-image-viewer .pswp__button:focus-visible,.viewer-download:focus-visible{outline:3px solid #b7d3aa;outline-offset:-4px}
.chat-image-viewer .pswp__downloadbar{position:absolute;bottom:0;left:0;right:0;padding:14px 20px calc(16px + env(safe-area-inset-bottom));text-align:center;color:#fff;background:linear-gradient(transparent,#111510 22%);pointer-events:auto;z-index:20}
.viewer-file-name{margin:0 0 5px;font-size:12px;line-height:1.5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.viewer-gesture-hint{margin:0 0 10px;font-size:11px;color:#bbc3b6}
.viewer-download{min-height:44px;min-width:150px;padding:10px 24px;border:1px solid #ffffff30;border-radius:22px;background:#fff;color:#273322;font:inherit;font-size:14px;cursor:pointer}
.viewer-download:disabled{opacity:.6}
.viewer-feedback{display:block;min-height:16px;margin-top:5px;font-size:11px;color:#d7dfd0}
@media(prefers-reduced-motion:reduce){.chat-image-viewer{--pswp-transition-duration:0ms}}
.video-preview{cursor:pointer}.video-preview video{pointer-events:none}.viewing-video{overflow:hidden}
dialog.video-viewer{position:fixed;inset:0;margin:0;width:100%;height:100dvh;max-width:none;max-height:none;padding:0;border:0;border-radius:0;background:#111510;color:#fff;overflow:hidden}
dialog.video-viewer[open]{display:grid;grid-template-rows:auto minmax(0,1fr) auto}.video-viewer::backdrop{background:#111510}
.video-viewer-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:calc(14px + env(safe-area-inset-top)) 20px 14px}.video-viewer-header span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.video-viewer button{border:1px solid #ffffff50;border-radius:24px;padding:10px 18px;background:transparent;color:#fff;white-space:nowrap}.video-viewer button:focus-visible{outline:3px solid #b7d3aa}.video-viewer video{display:block;width:100%;height:100%;min-height:0;object-fit:contain;background:#000}.video-viewer-footer{padding:16px 20px calc(16px + env(safe-area-inset-bottom));text-align:center}.video-viewer-footer button{margin:0 5px}.video-viewer-footer button:last-of-type{background:white;color:#111510}.video-viewer-footer p{min-height:20px;margin:12px 0 0;color:#ccc;font-size:12px;line-height:1.5}
.video-preview{width:340px;max-width:100%}.video-thumbnail{position:relative;display:block;width:100%;aspect-ratio:16/9;overflow:hidden;border-radius:8px;background:linear-gradient(145deg,#27352f,#101713)}
.video-thumbnail video,.video-thumbnail .video-poster{position:absolute;inset:0;display:block;width:100%;height:100%;max-height:none;object-fit:cover;border-radius:0;pointer-events:none}
.video-play-icon{position:absolute;z-index:2;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:56px;height:56px;border:2px solid #fff;border-radius:50%;background:#0008;box-shadow:0 2px 16px #0005;pointer-events:none}
.video-play-icon::after{content:"";display:block;width:0;height:0;border-top:10px solid transparent;border-bottom:10px solid transparent;border-left:16px solid white;margin-left:4px}
.video-preview:hover .video-play-icon,.video-preview:focus-visible .video-play-icon{background:#000b}.video-duration{position:absolute;z-index:2;right:8px;bottom:8px;padding:2px 6px;border-radius:4px;background:#000a;color:white;font-size:11px;font-variant-numeric:tabular-nums}.video-preview-hint{position:absolute;z-index:2;bottom:10px;left:10px;color:#fff;font-size:11px;text-shadow:0 1px 4px #000}

/* Enterprise OA test environment identity. */
.brand{font-size:20px;letter-spacing:0;align-items:center}.brand-mark{font:700 17px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;padding:0;border-radius:10px;flex-shrink:0}.brand small{font-size:8px;letter-spacing:.65px}
.intro h1{font-size:34px;line-height:1.55;letter-spacing:0;font-weight:650}.intro p{line-height:2}.welcome-icon{font:700 24px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;transform:none;border-radius:18px}.avatar{border-radius:10px;font-weight:700;font-size:13px}.welcome h2{font-weight:600;letter-spacing:0}.empty>span{font-size:22px;font-weight:700}.footer span{letter-spacing:.4px}
.oa-environment{margin-top:30px;padding:20px;border:1px solid #dce4ef;border-radius:12px;background:#ffffffa8}.oa-env-label{display:block;font-size:10px;color:#64748b}.oa-environment strong{display:block;margin:10px 0 18px;font-size:22px;letter-spacing:1px;color:#294b7d}.oa-environment p{display:flex;justify-content:space-between;gap:12px;font-size:10px;color:#64748b;margin:10px 0 0}.oa-environment p span{color:#334155}.side-bottom small{color:#8391a4}.tiny-dot{background:#5d80b2}
@media(max-width:700px){.welcome h2{font-size:22px}.room-heading{gap:10px}.room-heading h2{font-size:14px}.footer{gap:10px;align-items:center}.footer span{max-width:130px;text-align:right;line-height:1.6}.entry-links{gap:10px}.welcome .primary{padding:14px 20px}}