*{box-sizing:border-box} :root{--blue:#087cf0;--blue2:#eaf3ff;--text:#17202d;--muted:#8993a2;--line:#edf0f4;--bg:#f5f7fb}
body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--text);background:var(--bg)}
button,input{font:inherit}button{cursor:pointer}.hidden{display:none!important}.muted{color:var(--muted)}.small{font-size:12px}
.auth-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#e9f3ff,#f8faff 55%,#edf2ff)}
.auth-card{width:min(100%,410px);background:#fff;border:1px solid #edf0f5;border-radius:24px;padding:36px;box-shadow:0 18px 60px #193b6812}
.brand-mark{width:54px;height:54px;border-radius:18px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:27px;margin-bottom:20px}
.auth-card h1{font-size:25px;margin:0 0 7px}.auth-card>p{margin:0 0 25px}.auth-card form{display:grid;gap:10px}.auth-card label{font-size:13px;font-weight:650;margin-top:8px}.auth-card input{height:48px;border:1px solid #e2e7ee;border-radius:12px;padding:0 14px;outline:none}.auth-card input:focus,.search-wrap:focus-within,.composer:focus-within{border-color:#8bbcff;box-shadow:0 0 0 3px #087cf015}.primary{background:var(--blue);border:0;color:white;font-weight:650;border-radius:12px;height:48px;margin-top:13px}.full{width:100%}.auth-switch{text-align:center!important;font-size:14px;margin:22px 0 0!important}.auth-switch a{color:var(--blue);font-weight:650;text-decoration:none}.alert{background:#fff0f0;color:#bd3030;padding:11px 13px;border-radius:10px;font-size:13px;margin:14px 0}
.chat-page{height:100vh;overflow:hidden;background:#fff}.app-shell{height:100vh;max-width:1600px;margin:auto;display:flex;background:#fff;box-shadow:0 0 45px #1d35550b}
.sidebar{width:360px;flex:0 0 360px;border-right:1px solid var(--line);display:flex;flex-direction:column;position:relative;z-index:2;background:#fff}
.side-header{height:88px;padding:20px 22px;display:flex;align-items:center;justify-content:space-between}.brand-line{display:flex;align-items:center;gap:9px;font-size:20px;letter-spacing:-.5px}.brand-small{display:grid;place-items:center;background:var(--blue);color:#fff;border-radius:10px;width:30px;height:30px;font-size:17px}.side-header .muted{margin-top:5px}
.icon-button{border:0;background:#f2f5f9;color:#536173;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;text-decoration:none;font-size:20px}.icon-button:hover{background:#e8f1ff;color:var(--blue)}
.search-wrap{height:44px;margin:0 18px 18px;border:1px solid transparent;background:#f2f4f7;border-radius:12px;display:flex;align-items:center;gap:9px;padding:0 13px;color:#8993a2}.search-wrap span{font-size:23px}.search-wrap input{width:100%;border:0;outline:0;background:transparent;font-size:13px}
.section-title{padding:0 22px 10px;color:#9aa3af;font-size:10px;font-weight:750;letter-spacing:1.1px}.conversation-list{overflow-y:auto;flex:1;padding:0 9px}.conversation-item{width:100%;border:0;background:transparent;display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:13px;text-align:left}.conversation-item:hover{background:#f6f8fb}.conversation-item.active{background:var(--blue2)}
.avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;flex:0 0 48px}.avatar-fallback{display:inline-grid;place-items:center;background:#dceaff;color:#176bd0;font-size:18px;font-weight:700}.conversation-copy{min-width:0;display:flex;flex-direction:column;gap:5px;flex:1}.conversation-copy strong{font-size:14px}.conversation-copy small{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:190px}.conversation-meta{display:flex;align-items:center;flex-direction:column;gap:7px}.conversation-meta small{font-size:10px;color:#9aa3af}.unread-dot,.online-dot{width:9px;height:9px;background:#19c37d;border-radius:50%}
.side-footer{height:76px;border-top:1px solid var(--line);padding:13px 20px;display:flex;align-items:center;gap:11px}.me-avatar{width:39px;height:39px;border-radius:50%;display:grid;place-items:center;background:#dceaff;color:#176bd0;font-weight:700}.me-info{display:flex;flex-direction:column;gap:3px;flex:1}.me-info strong{font-size:13px}.me-info span{font-size:11px;color:var(--muted)}
.search-results{position:absolute;top:139px;left:12px;right:12px;background:white;border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 35px #182b451c;z-index:5;max-height:330px;overflow:auto;padding:6px}.search-result{width:100%;border:0;background:white;display:flex;align-items:center;gap:10px;padding:9px;border-radius:10px;text-align:left}.search-result:hover{background:#f4f7fb}.search-result .avatar{width:38px;height:38px;flex-basis:38px}.search-result span:nth-child(2){display:flex;flex-direction:column;gap:3px;flex:1}.search-result strong{font-size:13px}.search-result small{font-size:11px;color:var(--muted)}.search-result b{color:var(--blue);font-size:20px}
.chat-main{min-width:0;flex:1;position:relative;background:#fff}.empty-state{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:30px}.empty-icon{width:82px;height:82px;border-radius:28px;background:#edf5ff;color:var(--blue);display:grid;place-items:center;font-size:38px}.empty-state h2{font-size:21px;margin:22px 0 8px}.empty-state p{font-size:14px;color:var(--muted);max-width:330px;line-height:1.6;margin:0}
.conversation-panel{height:100%;display:flex;flex-direction:column}.chat-header{height:76px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 25px;gap:12px}.chat-header .avatar{width:42px;height:42px;flex-basis:42px}.header-person{display:flex;flex-direction:column;gap:4px;flex:1}.header-person strong{font-size:15px}.header-person span{font-size:11px;color:#19ad70}
.messages{flex:1;overflow-y:auto;padding:25px 5.5%;display:flex;flex-direction:column;gap:13px;background:linear-gradient(#fff,#fcfdff)}.message-row{display:flex;align-items:flex-end;gap:8px;max-width:75%}.message-row.mine{align-self:flex-end;justify-content:flex-end}.message-row.theirs{align-self:flex-start}.message-avatar{width:27px;height:27px;flex:0 0 27px;border-radius:50%;display:grid;place-items:center;background:#e2edff;color:#176bd0;font-size:11px;font-weight:700}.bubble-wrap{display:flex;flex-direction:column;gap:5px;min-width:0}.mine .bubble-wrap{align-items:flex-end}.bubble{padding:11px 15px;border-radius:18px;background:#f0f2f5;color:#222d3b;font-size:14px;line-height:1.5;overflow-wrap:anywhere;white-space:normal}.mine .bubble{background:var(--blue);color:white;border-bottom-right-radius:5px}.theirs .bubble{border-bottom-left-radius:5px}.message-time{font-size:10px;color:#a0a8b3;padding:0 4px}.composer{margin:0 4.5% 22px;border:1px solid #e7ebf1;background:#f5f7fa;border-radius:28px;display:flex;align-items:center;padding:5px 6px 5px 18px;transition:.15s}.composer input{flex:1;min-width:0;border:0;outline:0;background:transparent;height:40px;font-size:14px}.send-button{width:39px;height:39px;border:0;border-radius:50%;background:var(--blue);color:white;font-size:18px}.send-button:hover{background:#0069d8}
.loading,.no-items,.no-messages{padding:24px;text-align:center;color:#9aa3af;font-size:13px}.no-messages{margin:auto}
@media(max-width:700px){.sidebar{width:100%;flex-basis:100%}.chat-main{display:none}.app-shell.mobile-chat .sidebar{display:none}.app-shell.mobile-chat .chat-main{display:block;width:100%}.chat-header{height:68px;padding:0 14px}.messages{padding:18px 12px}.message-row{max-width:88%}.composer{margin:0 12px 12px}.side-header{height:76px}}

.mobile-back{display:none}@media(max-width:700px){.mobile-back{display:grid;flex:0 0 34px;width:34px;height:34px;font-size:25px}.chat-header{gap:8px}}