:root{color-scheme:light;--ink:#172b3c;--muted:#647b8d;--blue:#145d9b;--soft:#eef5fb;--line:#dbe6ee;--paper:#fff;--bg:#f4f7fa}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font:16px/1.4 system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.55;cursor:default}[hidden]{display:none!important}.app{height:100dvh;min-height:360px;max-width:760px;margin:auto;background:var(--paper);box-shadow:0 0 40px #173e5c14}.login-screen{height:100%;display:grid;place-items:center;padding:24px}.login-card{width:min(100%,390px);padding:32px;border:1px solid var(--line);border-radius:24px;box-shadow:0 18px 40px #15304a10;background:#fff}.brand-mark{width:56px;height:56px;border-radius:17px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:30px}.login-card h1{font-size:27px;margin:18px 0 4px}.login-card p{color:var(--muted);margin:0 0 24px}.login-card label{display:block;font-weight:650;margin-bottom:7px}.login-card input{width:100%;padding:12px 14px;border:1px solid #bfcfda;border-radius:12px;outline-color:var(--blue)}.primary{background:var(--blue);border:0;border-radius:12px;color:#fff;font-weight:650;width:100%;padding:13px;margin-top:14px}.login-card .error{color:#a82431;margin:12px 0 0;min-height:1em}.chat-screen{height:100%;display:flex;flex-direction:column;position:relative}.chat-header{height:72px;flex:none;display:flex;align-items:center;gap:12px;padding:10px 16px;background:#fff;border-bottom:1px solid var(--line);padding-top:max(10px,env(safe-area-inset-top))}.avatar{width:44px;height:44px;display:grid;place-items:center;border-radius:15px;background:#dcecff;color:#165686;font-size:28px}.heading{flex:1;min-width:0}.heading h1{font-size:17px;margin:0;font-weight:730}.heading p{font-size:12px;color:var(--muted);margin:2px 0 0}.icon-button{border:0;background:transparent;color:#40596a;width:40px;height:40px;font-size:26px}.settings{position:absolute;z-index:3;right:10px;top:67px;width:min(340px,calc(100% - 20px));padding:14px;background:white;border:1px solid var(--line);border-radius:15px;box-shadow:0 10px 30px #203b5430}.settings p{font-size:14px;color:#425c6e;margin:0 0 10px}.settings button{display:block;width:100%;padding:10px;margin-top:7px;border:1px solid var(--line);background:var(--soft);border-radius:10px;text-align:left;color:var(--ink)}.notice{background:#fff5dc;color:#63490e;padding:8px 16px;font-size:13px}.history-bar{text-align:center;background:var(--bg)}.history-bar button{border:0;background:transparent;color:var(--blue);padding:10px;font-size:13px}.messages{flex:1;overflow-y:auto;background:var(--bg);padding:15px 12px 20px;scrollbar-gutter:stable}.message{display:flex;margin:7px 0}.message.child{justify-content:flex-end}.bubble{max-width:min(85%,520px);padding:9px 12px 7px;background:#fff;border:1px solid #e2ebf2;border-radius:15px 15px 15px 5px;box-shadow:0 1px 2px #203b540c;overflow-wrap:anywhere}.child .bubble{background:#dceeff;border-color:#c9e1f7;border-radius:15px 15px 5px 15px}.sender{font-size:12px;font-weight:700;color:#235f89;margin-bottom:4px}.message-text{white-space:pre-wrap}.message-text:empty{display:none}.attachment{display:block;margin:7px 0;color:#145d9b;text-decoration:none;font-weight:600}.attachment img{display:block;max-width:100%;max-height:260px;border-radius:10px;object-fit:contain;background:#e5eef4}.attachment span{display:block;margin-top:5px;font-size:13px}.meta{font-size:11px;color:#708596;text-align:right;margin-top:5px}.read-bar{background:#fff;padding:0 12px;text-align:center}.read-bar button{border:0;background:#e6f5e9;color:#206132;border-radius:10px;padding:8px 12px;margin:6px auto;font-size:13px}.composer{display:flex;align-items:flex-end;gap:8px;padding:10px 12px max(10px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:white}.attach-button,.send-button{flex:none;display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:11px;font-size:25px}.attach-button{color:var(--blue);background:var(--soft);cursor:pointer}.send-button{background:var(--blue);color:#fff;font-size:20px}.compose-middle{flex:1;min-width:0;background:#f5f8fb;border:1px solid var(--line);border-radius:12px;padding:4px 9px}.compose-middle textarea{width:100%;min-height:30px;max-height:130px;resize:none;border:0;outline:0;background:transparent;padding:6px 2px;display:block}.file-name{font-size:12px;color:var(--blue);display:block;padding:0 2px 2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-remove{border:0;background:transparent;color:#aa3144;font-size:11px;padding:0 2px 4px}@media(max-width:480px){.app{box-shadow:none}.messages{padding:12px 8px}.bubble{max-width:88%}}