:root{font-family:Inter,"Microsoft YaHei",sans-serif;color:#16212b;background:#f4f7f8;--green:#16a179;--line:#e3e9eb;--muted:#71808a}*{box-sizing:border-box}body{margin:0;min-height:100vh}.login-shell{min-height:100vh;display:grid;place-items:center;background:linear-gradient(145deg,#edf8f4,#f6f8f9)}.login-card{width:min(420px,calc(100% - 32px));padding:40px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 50px #19352b12}.logo{width:48px;height:48px;display:grid;place-items:center;border-radius:14px;background:var(--green);color:#fff;font-weight:800;font-size:24px}.eyebrow{margin:24px 0 8px;font-size:12px;letter-spacing:2px;color:var(--green);font-weight:700}.login-card h1{margin:0;font-size:28px}.muted{color:var(--muted);font-size:14px}.login-card form{display:grid;gap:16px;margin-top:28px}label{display:grid;gap:7px;font-size:13px;color:#53616a}input{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:9px;font:inherit;outline:none}input:focus{border-color:var(--green);box-shadow:0 0 0 3px #16a17918}button{border:0;border-radius:9px;padding:12px 16px;font:inherit;cursor:pointer}.primary{background:var(--green);color:#fff;font-weight:700}.mode-toggle{display:block;margin:10px auto 0;background:transparent;color:var(--green);font-size:13px}.error{color:#c34a42;min-height:20px;font-size:13px}.chat-shell{height:100vh;display:grid;grid-template-columns:280px 1fr;background:#fff}.sidebar{border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0}.side-head{padding:24px 20px 16px}.side-head h1{margin:0;font-size:20px}.side-head p{color:var(--muted);font-size:12px;margin:6px 0 18px}.search{padding:10px 12px;border-radius:8px;background:#f4f7f7;border:0}.conversation-list{overflow:auto;padding:4px 10px}.conversation{width:100%;display:flex;gap:11px;text-align:left;background:transparent;padding:13px 10px;border-radius:10px}.conversation:hover,.conversation.active{background:#edf7f3}.avatar{width:40px;height:40px;display:grid;place-items:center;background:#d9efe8;color:#147d61;border-radius:12px;font-weight:800;flex:0 0 auto}.conversation strong{display:block;font-size:14px}.conversation small{display:block;color:var(--muted);margin-top:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}.unread{margin-left:auto;background:var(--green);color:#fff;border-radius:99px;padding:2px 7px;font-size:11px;height:max-content}.profile{margin-top:auto;border-top:1px solid var(--line);padding:15px 20px;font-size:13px}.profile button{float:right;padding:5px 8px;background:#eef2f2;color:#53616a}.main{min-width:0;display:flex;flex-direction:column}.chat-head{height:72px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px}.chat-head h2{font-size:17px;margin:0}.chat-head small{display:block;color:var(--muted);font-size:12px;margin-top:4px}.messages{flex:1;overflow:auto;padding:25px 7%;background:#fafcfc}.bubble{max-width:min(620px,80%);margin:0 0 16px;padding:11px 14px;border-radius:12px;background:#fff;border:1px solid var(--line);box-shadow:0 2px 8px #183b2b08}.bubble.mine{margin-left:auto;background:#e2f5ee;border-color:#c9ebdf}.bubble small{display:block;color:var(--muted);font-size:11px;margin-top:6px}.bubble audio{max-width:100%}.composer{display:flex;gap:10px;padding:18px 7%;border-top:1px solid var(--line)}.composer input{flex:1}.empty{color:var(--muted);text-align:center;margin:auto;font-size:14px}@media(max-width:700px){.chat-shell{grid-template-columns:1fr}.sidebar{display:none}.messages{padding:20px 16px}.composer{padding:12px 16px}.chat-head{padding:0 16px}}
.profile-name{display:inline-flex!important;float:none!important;flex-direction:column;align-items:flex-start;padding:0!important;background:transparent!important;color:#16212b!important;text-align:left}.profile-name small{color:var(--muted);font-size:11px;margin-top:4px}.modal-backdrop{position:fixed;inset:0;display:grid;place-items:center;padding:20px;background:#10251f55;z-index:10}.settings-modal{width:min(620px,100%);max-height:calc(100vh - 40px);overflow:auto;padding:26px;background:#fff;border-radius:14px;box-shadow:0 20px 70px #10251f33}.settings-modal header{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:18px}.settings-modal h2{margin:0;font-size:21px}.settings-modal header p{margin:7px 0 0;color:var(--muted);font-size:12px}.settings-modal .icon-button{background:#eef2f2;padding:7px 11px}.settings-form,.settings-section{padding:20px 0;border-bottom:1px solid var(--line)}.settings-form{display:grid;gap:12px}.settings-form h3,.settings-section h3{margin:0;font-size:15px}.settings-form button{justify-self:start}.form-feedback{min-height:17px;margin:0;color:#c34a42;font-size:12px}.settings-row{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:12px 0;border-bottom:1px solid #f0f3f3}.settings-row:last-child{border-bottom:0}.settings-row strong,.settings-row small{display:block}.settings-row small{margin-top:5px;color:var(--muted);font-size:11px}.settings-row em{font-style:normal;color:var(--green);font-size:11px}.settings-row .secondary-button{padding:7px 10px;background:#eef7f4;color:var(--green);font-size:12px;white-space:nowrap}
[hidden]{display:none!important}
.desktop-mode{background:linear-gradient(145deg,#edf8f4,#f4f7f8)}
.desktop-mode .chat-shell{height:calc(100vh - 32px);margin:16px;grid-template-columns:330px minmax(0,1fr);gap:16px;background:transparent}
.desktop-mode .sidebar,.desktop-mode .main{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 36px #19352b0d;overflow:hidden}
.desktop-mode .sidebar{border-right:1px solid var(--line)}
.desktop-mode .side-head{padding:26px 22px 16px}
.desktop-mode .side-head h1{font-size:22px;letter-spacing:-.4px}
.desktop-mode .conversation-list{padding:7px 12px}
.desktop-mode .conversation{padding:14px 12px;border-radius:13px}
.desktop-mode .conversation:hover,.desktop-mode .conversation.active{background:#eaf7f2}
.desktop-mode .main{min-width:0}
.desktop-mode .chat-head{height:82px;padding:0 32px;background:#fff}
.desktop-mode .chat-peer{min-width:0;flex:1}
.desktop-mode .chat-peer>div{min-width:0}
.desktop-mode .chat-subtitle{max-width:min(720px,calc(100vw - 520px));white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.desktop-mode .messages{padding:30px 9%;background:#fbfdfd}
.desktop-mode .composer{padding:19px 9%;background:#fff}
.desktop-mode .composer button{min-width:62px}
.desktop-mode .profile{padding:17px 22px;background:#fbfdfd}
.desktop-mode .settings-modal{border-radius:18px}
/* Constrain Grid/Flex children so long histories scroll inside the viewport. */
.chat-shell>.sidebar,.chat-shell>.main,.chat-shell .messages{min-height:0}
[hidden]{display:none!important}
.group-modal{width:min(760px,100%);max-height:calc(100vh - 32px);overflow:auto;padding:24px;background:#fff;border-radius:16px;box-shadow:0 24px 80px #10251f35}.group-modal header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}.group-title{display:flex;align-items:center;gap:12px}.group-title h2{margin:0;font-size:20px}.group-title p{margin:6px 0 0;color:var(--muted);font-size:12px}.group-avatar,.group-avatar-preview,.member-avatar{display:grid;place-items:center;overflow:hidden;background:#d9efe8;color:#147d61;font-weight:800}.group-avatar{width:48px;height:48px;border-radius:14px;font-size:20px}.group-avatar img,.group-avatar-preview img,.member-avatar img{width:100%;height:100%;object-fit:cover}.group-section{padding:18px 0;border-bottom:1px solid var(--line)}.group-section h3,.group-section-heading{margin:0 0 12px}.group-section-heading{display:flex;justify-content:space-between;align-items:center}.group-section-heading span{color:var(--muted);font-size:12px}.group-profile-form{display:grid;gap:11px}.group-profile-form textarea{width:100%;resize:vertical;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font:inherit;outline:none}.group-profile-form textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px #16a17918}.group-avatar-editor{display:flex;align-items:center;gap:12px}.group-avatar-preview{width:56px;height:56px;border-radius:16px;font-size:22px;flex:0 0 auto}.group-avatar-editor label{flex:1}.group-readonly p{margin:0;color:#53616a;line-height:1.7}.group-readonly .group-announcement{margin-top:8px;padding:10px 12px;background:#f4f7f7;border-radius:8px}.group-tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.group-tools>div{margin-right:auto}.group-tools strong,.group-tools small{display:block}.group-tools small{color:var(--muted);font-size:11px;margin-top:4px}.group-switch{display:flex;align-items:center;gap:6px;font-size:12px;white-space:nowrap}.group-switch input{width:auto}.group-search{display:flex;gap:8px}.group-search input{flex:1}.member-list{display:grid;gap:2px}.member-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid #f0f3f3}.member-row:last-child{border-bottom:0}.member-main{display:flex;align-items:center;gap:10px;min-width:0}.member-main>span:last-child{min-width:0}.member-main strong,.member-main small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.member-main small{margin-top:4px;color:var(--muted);font-size:11px}.member-avatar{width:34px;height:34px;border-radius:10px;flex:0 0 auto}.member-actions{display:flex;align-items:center;justify-content:flex-end;gap:6px;flex-wrap:wrap}.member-actions button,.member-actions select,.group-modal .secondary-button,.group-modal .danger-button{padding:7px 9px;font-size:12px}.member-actions select{border:1px solid var(--line);border-radius:7px;background:#fff;color:#53616a}.group-footer{display:flex;justify-content:flex-end;gap:8px;padding-top:18px}.danger-button{background:#fff0ef;color:#c34a42}.modal-empty{margin:10px 0;color:var(--muted);font-size:12px}@media(max-width:620px){.modal-backdrop{padding:10px}.group-modal{max-height:calc(100vh - 20px);padding:18px;border-radius:12px}.member-row{align-items:flex-start;flex-direction:column}.member-actions{justify-content:flex-start;width:100%}.group-footer{justify-content:stretch}.group-footer button{flex:1}.group-tools{align-items:flex-start}.group-tools>div{width:100%;margin-bottom:2px}}