:root{--bg:#eef2f7;--panel:#fff;--panel2:#f8fafc;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--primary:#6366f1;--primary2:#8b5cf6;--danger:#ef4444;--ok:#10b981;--warn:#f59e0b;--soft:#f1f5f9;--input:#f8fafc;--shadow:0 16px 40px rgba(15,23,42,.11);--app-h:100dvh;--app-top:0px;--app-left:0px;--app-w:100vw}
html[data-theme=dark]{--bg:#0f172a;--panel:#1e293b;--panel2:#0f172a;--text:#e2e8f0;--muted:#94a3b8;--line:#334155;--soft:#334155;--input:#0f172a;--shadow:0 20px 50px rgba(0,0,0,.45)}
*{box-sizing:border-box}html,body{height:100%;margin:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:radial-gradient(circle at 0 0,rgba(99,102,241,.16),transparent 30%),var(--bg);color:var(--text);overflow:hidden;position:fixed;width:100%;height:100%;font-size:14px}
button,input,textarea,select{font:inherit}button{cursor:pointer}
.auth-page{min-height:var(--app-h);display:grid;place-items:center;padding:18px}
.auth-shell{width:min(900px,100%);display:grid;grid-template-columns:1fr .9fr;background:var(--panel);border-radius:24px;box-shadow:var(--shadow);overflow:hidden}
.auth-hero{padding:34px 38px;background:linear-gradient(180deg,#f8f7ff,#eef4ff);color:var(--text);display:flex;flex-direction:column;justify-content:center}
.auth-kicker{width:max-content;border-radius:999px;background:rgba(108,99,255,.12);color:var(--primary);font-size:12px;font-weight:900;padding:6px 10px;margin-bottom:14px}
.auth-hero h1{font-size:28px;line-height:1.2;margin:0 0 12px;letter-spacing:0}.auth-hero p{line-height:1.65;color:var(--muted);margin:0}
.hero-feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:20px}
.hero-feature{background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:12px;padding:11px;box-shadow:0 8px 22px rgba(15,23,42,.05)}
.hero-feature strong{display:block;font-size:14px;margin-bottom:4px}.hero-feature span{display:block;color:var(--muted);font-size:12px;line-height:1.42}
.hero-note{margin-top:18px!important;color:var(--primary)!important;font-weight:800}
.auth-card{padding:36px}
.auth-logo{width:48px;height:48px;border-radius:15px;background:linear-gradient(135deg,var(--primary),var(--primary2));display:grid;place-items:center;color:#fff;font-size:22px;margin-bottom:16px}
.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--soft);border-radius:13px;padding:4px;margin:16px 0}
.tab{text-align:center;padding:9px;border-radius:10px;font-weight:800;color:var(--muted)}
.tab.active{background:var(--panel);color:var(--primary);box-shadow:0 8px 20px rgba(0,0,0,.08)}
.field{margin-bottom:12px}.field label{font-weight:800;display:block;margin-bottom:6px}
.field input{width:100%;border:1px solid var(--line);background:var(--input);border-radius:12px;padding:10px 11px;color:var(--text);outline:none;font-size:14px}
.field input:focus{border-color:var(--primary)}
.hint{font-size:12px;color:var(--muted);margin-top:5px}
.auth-btn{width:100%;border:none;border-radius:12px;padding:11px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900}
.auth-error{text-align:center;color:var(--danger);min-height:22px;margin-top:12px}
.remember{display:flex;gap:8px;align-items:center;margin:8px 0 18px;color:var(--muted)}
.app{height:100%;display:grid;grid-template-columns:300px 1fr;gap:12px;padding:12px;overflow:hidden}
.sidebar,.main{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden}
.sidebar{display:flex;flex-direction:column}
.sidebar-head{padding:12px;border-bottom:1px solid var(--line)}
.profile-card{background:linear-gradient(135deg,#111827,#374151);color:#fff;border-radius:14px;padding:10px;display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:9px}
.avatar,.friend-avatar,.big-avatar{display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900}
.avatar{width:38px;height:38px;border-radius:12px;cursor:pointer;position:relative}
.avatar.admin{box-shadow:0 0 0 2px var(--warn)}
.avatar.admin::after{content:'★';position:absolute;right:-4px;top:-6px;font-size:13px;color:var(--warn)}
.profile-info{display:flex;gap:8px;align-items:center;min-width:0}
.profile-name{font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.profile-id{font-size:11px;opacity:.75}
.mini-btn{border:none;border-radius:10px;padding:6px 8px;background:rgba(255,255,255,.12);color:#fff;font-size:13px}
.search input{width:100%;border:1px solid var(--line);background:var(--input);border-radius:12px;padding:9px 10px;color:var(--text);outline:none;margin-bottom:8px;font-size:14px}
.friends-btn{width:100%;border:none;border-radius:12px;padding:9px 10px;font-weight:900;background:var(--soft);color:var(--text);position:relative;font-size:14px}
.red-dot{position:absolute;right:10px;top:6px;min-width:17px;height:17px;padding:0 5px;border-radius:999px;background:var(--danger);color:#fff;font-size:10px;display:none;place-items:center}
.friends-btn.has-request .red-dot{display:grid}
.room-list{flex:1;overflow:auto;padding:6px}
.group-title{font-size:11px;color:var(--muted);font-weight:900;padding:8px 10px 5px}
.room-item{display:flex;align-items:center;gap:9px;padding:8px 9px;border-radius:12px;cursor:pointer;min-height:45px}
.room-item:hover,.room-item.active{background:var(--soft)}
.room-icon{width:34px;height:34px;border-radius:11px;background:rgba(99,102,241,.15);display:grid;place-items:center;flex:0 0 auto;font-size:15px}
.friend-icon,.person-icon{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900}
.room-text{min-width:0;flex:1}
.room-name{font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.room-meta{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.badge{min-width:19px;height:19px;border-radius:999px;background:var(--danger);color:#fff;font-size:10px;display:grid;place-items:center;font-weight:900}
.empty-list{padding:24px 10px;text-align:center;color:var(--muted);font-size:13px}
.side-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:10px;border-top:1px solid var(--line)}
.soft-btn,.primary-btn,.danger-btn,.icon-btn,.warn-btn{border:none;border-radius:12px;padding:8px 10px;font-weight:850;font-size:14px}
.soft-btn{background:var(--soft);color:var(--text)}
.primary-btn{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}
.danger-btn{background:rgba(239,68,68,.12);color:var(--danger)}
.warn-btn{background:rgba(245,158,11,.15);color:var(--warn)}
.icon-btn{width:36px;height:36px;padding:0;background:var(--input);border:1px solid var(--line);color:var(--text);display:grid;place-items:center}
.main{display:flex;flex-direction:column;position:relative}
.imp-bar{display:none;background:var(--warn);color:#111;text-align:center;padding:6px;font-size:13px;font-weight:800}
.imp-bar.show{display:block}
.offline{display:none;background:var(--danger);color:#fff;text-align:center;padding:6px;font-size:13px}
.offline.show{display:block}
.chat-head{min-height:52px;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line)}
.head-left{display:flex;gap:10px;align-items:center;min-width:0}
.mobile-menu{display:none}
.title{font-weight:950;font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sub{font-size:12px;color:var(--muted)}
.head-actions{display:flex;gap:8px}
.search-bar{display:none;padding:10px 14px;border-bottom:1px solid var(--line)}
.search-bar.show{display:block}
.search-bar input{width:100%;border:1px solid var(--line);background:var(--input);color:var(--text);border-radius:12px;padding:9px 10px;outline:none;font-size:14px}
.messages{flex:1;min-height:0;overflow:auto;padding:16px;background:var(--panel2);display:flex;flex-direction:column;gap:9px;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
.empty{margin:auto;text-align:center;color:var(--muted)}
.message{max-width:min(70%,680px);padding:10px 12px;border-radius:16px 16px 16px 5px;background:var(--panel);border:1px solid var(--line);box-shadow:0 6px 18px rgba(15,23,42,.07);align-self:flex-start}
.message.mine{align-self:flex-end;border-radius:16px 16px 5px 16px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;border:none}
.message.system{align-self:center;background:transparent;box-shadow:none;border:none;color:var(--muted);font-size:13px}
.message.revoked-admin{opacity:.6;border-style:dashed}
.author{font-size:12px;font-weight:900;color:var(--primary);margin-bottom:5px;cursor:pointer}
.mine .author{color:rgba(255,255,255,.85)}
.content{line-height:1.5;word-break:break-word;white-space:normal;min-width:0}
.content.plain-text,.content .plain-text{white-space:pre-wrap}
.content p{margin:0 0 .55em}.content p:last-child{margin-bottom:0}
.content h1,.content h2,.content h3,.content h4,.content h5,.content h6{margin:.7em 0 .35em;line-height:1.25;letter-spacing:0}.content h1{font-size:1.25em}.content h2{font-size:1.16em}.content h3{font-size:1.08em}.content h4,.content h5,.content h6{font-size:1em}
.content h1:first-child,.content h2:first-child,.content h3:first-child,.content h4:first-child,.content h5:first-child,.content h6:first-child{margin-top:0}
.content ul,.content ol{margin:.4em 0 .55em;padding-left:1.45em}.content li+li{margin-top:.2em}
.content blockquote{margin:.55em 0;padding:.35em .65em;border-left:3px solid var(--primary);background:rgba(99,102,241,.08);color:var(--muted)}
.content code{padding:.1em .32em;border-radius:4px;background:rgba(15,23,42,.09);font-family:Consolas,"SFMono-Regular",monospace;font-size:.92em}
.content pre{max-width:100%;margin:.55em 0;padding:9px 10px;overflow:auto;border-radius:6px;background:#111827;color:#f8fafc;line-height:1.45;-webkit-overflow-scrolling:touch}.content pre code{padding:0;background:transparent;color:inherit;white-space:pre;word-break:normal}
.content a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}.message.mine .content a{color:#fff}
.content table{display:block;max-width:100%;margin:.55em 0;overflow-x:auto;border-collapse:collapse;-webkit-overflow-scrolling:touch}.content th,.content td{padding:5px 7px;border:1px solid var(--line);white-space:nowrap}.content th{font-weight:900;background:rgba(15,23,42,.06)}
.content hr{height:1px;margin:.7em 0;border:0;background:var(--line)}
.content .forward-label{display:block;margin-bottom:.3em;font-size:.9em;opacity:.75}.content .forward-body{min-width:0}
.content .katex{font-size:1.04em}.content .katex-display{max-width:100%;margin:.55em 0;padding:.15em 0;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}.content .katex-display>.katex{min-width:max-content}
.message.mine .content blockquote{border-left-color:rgba(255,255,255,.8);background:rgba(255,255,255,.14);color:rgba(255,255,255,.9)}.message.mine .content code{background:rgba(255,255,255,.18)}.message.mine .content th{background:rgba(255,255,255,.14)}.message.mine .content th,.message.mine .content td{border-color:rgba(255,255,255,.3)}
.content img{max-width:100%;border-radius:16px;cursor:zoom-in}
.mention{background:rgba(99,102,241,.18);color:var(--primary);padding:1px 5px;border-radius:6px;font-weight:800}
.mine .mention{background:rgba(255,255,255,.25);color:#fff}
.time{font-size:11px;color:var(--muted);text-align:right;margin-top:7px}
.mine .time{color:rgba(255,255,255,.7)}
.time{cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.message-actions{display:flex;gap:6px;justify-content:flex-start;margin-top:7px}
.message.mine .message-actions{justify-content:flex-end}
.msg-action-btn{border:1px solid var(--line);background:var(--input);color:var(--text);border-radius:10px;padding:6px 10px;font-size:12px;font-weight:900;line-height:1;box-shadow:0 4px 12px rgba(15,23,42,.08)}
.message.mine .msg-action-btn{border-color:rgba(255,255,255,.28);background:rgba(255,255,255,.16);color:#fff}
.msg-action-btn.danger{border-color:rgba(239,68,68,.35);color:var(--danger);background:rgba(239,68,68,.08)}
.message.mine .msg-action-btn.danger{border-color:rgba(255,255,255,.32);background:rgba(255,255,255,.2);color:#fff}
.composer{display:flex;gap:8px;align-items:flex-end;padding:10px 14px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line);position:relative;z-index:10}
.attach{width:40px;height:40px;border-radius:14px;background:var(--soft);display:grid;place-items:center;cursor:pointer}
.attach.is-busy{opacity:.55;pointer-events:none}
.composer textarea{flex:1;min-width:0;max-height:120px;resize:none;border:1px solid var(--line);background:var(--input);color:var(--text);border-radius:14px;padding:10px 11px;outline:none;font-size:14px}
.edit-cancel{width:40px;height:40px;flex:0 0 auto;border:1px solid var(--line);border-radius:14px;background:var(--soft);color:var(--text);font-size:22px;line-height:1;place-items:center}.edit-cancel[hidden]{display:none}.composer.editing .edit-cancel{display:grid}.composer.editing textarea{border-color:var(--primary);box-shadow:0 0 0 2px rgba(99,102,241,.14)}.composer.editing .send{background:var(--ok)}
.send{width:46px;height:40px;border:none;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:950}
.scroll-bottom{position:absolute;right:14px;bottom:76px;background:var(--primary);color:#fff;border:none;border-radius:999px;padding:8px 12px;font-weight:900;display:none}
.scroll-bottom.show{display:block}
.modal{position:fixed;inset:0;background:rgba(15,23,42,.48);display:none;align-items:center;justify-content:center;z-index:1000;padding:18px;backdrop-filter:blur(8px)}
.modal.show{display:flex}
.modal-card{width:min(500px,100%);max-height:86vh;overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:20px;box-shadow:0 24px 64px rgba(0,0,0,.24)}
.modal-card.big{width:min(920px,100%)}
.modal-head{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line)}
.modal-title{font-weight:950;font-size:16px}
.close{border:none;width:34px;height:34px;border-radius:11px;background:var(--soft);color:var(--text)}
.modal-body{padding:16px}
.modal-body label{display:block;font-weight:900;margin:9px 0 6px}
.modal-body input,.modal-body select,.modal-body textarea{width:100%;border:1px solid var(--line);background:var(--input);color:var(--text);border-radius:12px;padding:10px;outline:none;font-size:14px}
.modal-body textarea{resize:vertical;min-height:90px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}
.friend-tabs{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-bottom:14px}
.friend-tab{border:none;border-radius:11px;padding:8px;background:var(--soft);color:var(--text);font-weight:850;font-size:13px}
.friend-tab.active{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}
.friend-row,.member-row{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:9px 0;border-bottom:1px solid var(--line)}
.friend-info{display:flex;align-items:center;gap:10px;min-width:0;cursor:pointer}
.friend-avatar{width:32px;height:32px;border-radius:11px;flex:0 0 auto}
.friend-name{font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.friend-uid{font-size:12px;color:var(--muted)}
.status-dot{width:9px;height:9px;border-radius:50%;display:inline-block;background:#94a3b8;margin-right:5px}
.status-dot.online{background:var(--ok)}
.big-avatar{width:64px;height:64px;border-radius:20px;font-size:28px;margin:0 auto 10px}
.profile-head{text-align:center}
.profile-big-name{font-size:20px;font-weight:950}
.uid-box{display:inline-flex;align-items:center;gap:8px;margin-top:8px;background:var(--soft);border-radius:12px;padding:7px 10px}
.uid-box button{border:none;background:var(--primary);color:#fff;border-radius:10px;padding:6px 10px}
.profile-meta{color:var(--muted);font-size:13px;line-height:1.8;margin-top:10px}
.profile-actions{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.remark-box{display:flex;gap:8px}.remark-box input{flex:1}
.context{display:none;position:fixed;z-index:1300;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 44px rgba(0,0,0,.18);padding:6px;min-width:150px}
.context div{padding:11px 12px;border-radius:12px;font-weight:800;cursor:pointer}
.context div:hover{background:var(--soft)}
.context div.adm{color:var(--warn)}
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.88);display:none;align-items:center;justify-content:center;z-index:2000;padding:20px}
.lightbox.show{display:flex}.lightbox img{max-width:100%;max-height:100%;border-radius:12px}
.lb-close{position:absolute;right:20px;top:18px;color:#fff;font-size:32px;cursor:pointer}
.toast-wrap{position:fixed;left:50%;bottom:30px;transform:translateX(-50%);z-index:3000;display:flex;flex-direction:column;gap:10px;pointer-events:none}
.toast{background:rgba(17,24,39,.94);color:#fff;border-radius:14px;padding:12px 18px;font-weight:800}
.toast.success{background:rgba(16,185,129,.96)}
.toast.error{background:rgba(239,68,68,.96)}
.overlay{display:none}
.adm-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.adm-tab{border:none;border-radius:12px;padding:8px 12px;background:var(--soft);color:var(--text);font-weight:800;font-size:13px}
.adm-tab.active{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}
.adm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.adm-card{background:var(--soft);border-radius:14px;padding:12px}
.adm-card .k{font-size:12px;color:var(--muted)}
.adm-card .v{font-size:18px;font-weight:900;margin-top:4px;word-break:break-all}
.adm-table{width:100%;border-collapse:collapse;font-size:13px}
.adm-table th,.adm-table td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line);white-space:nowrap}
.adm-table td.wrap{white-space:normal;word-break:break-all}
.adm-scroll{overflow:auto;max-height:52vh}
.adm-act{display:inline-flex;gap:4px;flex-wrap:wrap}
.adm-act button{border:none;border-radius:9px;padding:5px 8px;font-size:12px;font-weight:800}
.adm-row-form{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.adm-row-form input,.adm-row-form select{flex:1;min-width:120px;border:1px solid var(--line);background:var(--input);color:var(--text);border-radius:12px;padding:9px}
.adm-section{border-top:1px solid var(--line);padding-top:12px;margin-top:14px}
.adm-section h3{margin:0 0 10px;font-size:14px}
.adm-check{display:inline-flex;align-items:center;gap:6px;flex:0 0 auto;color:var(--muted);font-weight:800}
.adm-check input{width:auto}
.adm-danger-zone{border:1px solid rgba(239,68,68,.35);border-radius:12px;padding:12px;background:rgba(239,68,68,.06)}
.adm-danger-zone summary{cursor:pointer;font-weight:900;color:var(--danger)}
.adm-danger-zone p{margin:8px 0 12px;color:var(--muted)}
.adm-card pre{white-space:pre-wrap;margin:0;word-break:break-word}
.pill{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:800}
.pill.on{background:rgba(16,185,129,.18);color:var(--ok)}
.pill.off{background:var(--soft);color:var(--muted)}
.pill.ban{background:rgba(239,68,68,.18);color:var(--danger)}
.pill.adm{background:rgba(245,158,11,.2);color:var(--warn)}
@media(max-width:900px){
body{position:fixed;top:var(--app-top);left:var(--app-left);right:auto;bottom:auto;width:var(--app-w)}
.auth-shell{grid-template-columns:1fr}.auth-hero{display:none}.auth-card{padding:34px 24px}
.hero-feature-grid{grid-template-columns:1fr}
.app{grid-template-columns:1fr;padding:0;gap:0;height:100vh;height:100dvh}.main{border-radius:0;border:none;height:100%;position:relative}
.sidebar{position:fixed;z-index:300;left:12px;top:12px;bottom:12px;width:min(88vw,350px);transform:translateX(calc(-100% - 24px));transition:.25s;border-radius:24px}
.sidebar.open{transform:translateX(0)}
.overlay.show{display:block;position:fixed;inset:0;background:rgba(15,23,42,.48);z-index:250}
.mobile-menu{display:grid}.message{max-width:86%}.messages{padding:16px 12px}
.composer{padding:10px 12px calc(10px + env(safe-area-inset-bottom))}.scroll-bottom{bottom:80px}
.modal-card.big{width:100%}
input,textarea,select,button,a,.room-item{-webkit-tap-highlight-color:transparent}
.modal{align-items:flex-end;padding:0}
.modal-card{max-height:88vh;border-bottom-left-radius:0;border-bottom-right-radius:0}
.main{display:flex;flex-direction:column;height:100%}
.messages{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch}
.composer{flex-shrink:0}
}
@media(max-width:900px){
html,body{height:var(--app-h);min-height:var(--app-h);overscroll-behavior:none}
body{height:var(--app-h);min-height:var(--app-h);overflow:hidden}
.auth-page{height:var(--app-h);min-height:var(--app-h);overflow:auto;-webkit-overflow-scrolling:touch}
.app{height:var(--app-h);min-height:var(--app-h);max-height:var(--app-h)}
.main{height:var(--app-h);min-height:0;overflow:hidden}
.chat-head{min-height:50px;padding:8px 10px;padding-top:calc(8px + env(safe-area-inset-top));gap:8px}
.head-left{flex:1;min-width:0;gap:8px}
.head-actions{flex:0 0 auto;gap:6px}
.icon-btn{width:36px;height:36px;border-radius:12px;flex:0 0 auto}
.title{font-size:16px;max-width:44vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sub{max-width:46vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-bar{padding:10px 12px}
.messages{padding:12px 9px;gap:8px;overscroll-behavior:contain}
.message{max-width:88%;padding:9px 10px;border-radius:15px 15px 15px 5px}
.message.mine{border-radius:15px 15px 5px 15px}
.content{overflow-wrap:anywhere}
.content img{max-height:46vh;object-fit:contain}
.composer{gap:7px;padding:8px 9px calc(8px + env(safe-area-inset-bottom));background:var(--panel)}
.attach,.send,.edit-cancel{width:38px;height:38px;border-radius:13px;flex:0 0 auto}
.send{width:44px}
.composer textarea{min-height:38px;max-height:35vh;padding:9px 10px;border-radius:13px}
.scroll-bottom{right:10px;bottom:calc(64px + env(safe-area-inset-bottom));padding:8px 11px}
body.keyboard-open .chat-head{min-height:42px;padding:6px 8px;padding-top:calc(6px + env(safe-area-inset-top));gap:6px}
body.keyboard-open .head-left{gap:6px}
body.keyboard-open .head-actions{gap:4px}
body.keyboard-open .icon-btn{width:32px;height:32px;border-radius:11px;font-size:16px}
body.keyboard-open .title{font-size:15px;max-width:50vw}
body.keyboard-open .sub{display:none}
body.keyboard-open .messages{padding:8px 8px;gap:6px}
body.keyboard-open .message{padding:8px 10px;border-radius:13px 13px 13px 5px}
body.keyboard-open .message.mine{border-radius:13px 13px 5px 13px}
body.keyboard-open .meta{font-size:11px;margin-top:5px}
body.keyboard-open .composer{gap:6px;padding:6px 8px calc(6px + env(safe-area-inset-bottom))}
body.keyboard-open .attach,body.keyboard-open .send{width:34px;height:34px;border-radius:12px}
body.keyboard-open .send{width:38px}
body.keyboard-open .composer textarea{min-height:34px;max-height:24vh;padding:7px 9px;border-radius:12px}
body.keyboard-open .scroll-bottom{bottom:calc(52px + env(safe-area-inset-bottom))}
.sidebar{left:0;top:0;bottom:0;width:min(86vw,360px);border-radius:0 24px 24px 0;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
.sidebar-head{padding:11px}
.profile-card{border-radius:13px}
.side-actions{padding:9px}
.room-list{padding:6px}
.room-item{padding:8px 9px;border-radius:12px;min-height:44px}
.modal-card{width:100%;max-height:min(92vh,var(--app-h));border-radius:24px 24px 0 0}
.modal-head{position:sticky;top:0;background:var(--panel);z-index:2;padding:14px 16px}
.modal-body{padding:16px;overflow-wrap:anywhere}
.modal-actions{gap:8px}
#adminModal .modal-card.big{width:100%;height:var(--app-h);max-height:var(--app-h);border-radius:0;border-left:0;border-right:0}
#adminModal .modal-body{height:calc(var(--app-h) - 65px);overflow:auto;padding:12px;-webkit-overflow-scrolling:touch}
.adm-tabs{position:sticky;top:0;z-index:3;background:var(--panel);padding-bottom:8px;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.adm-tabs::-webkit-scrollbar{display:none}
.adm-tab{flex:0 0 auto;white-space:nowrap}
.adm-grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
.adm-row-form{display:grid;grid-template-columns:1fr;gap:8px}
.adm-row-form input,.adm-row-form select,.adm-row-form button{width:100%;min-width:0}
.adm-scroll{max-height:44vh;overflow:auto;-webkit-overflow-scrolling:touch}
.adm-table{min-width:640px}
.adm-card{border-radius:12px;padding:10px}
.friend-row,.member-row{align-items:flex-start}
.friend-row .adm-act,.member-row .adm-act{justify-content:flex-end}
.context{max-width:calc(100vw - 24px);max-height:60vh;overflow:auto}
.toast-wrap{left:12px;right:12px;bottom:calc(76px + env(safe-area-inset-bottom));transform:none;align-items:center}
.toast{max-width:100%;text-align:center}
}
@media(max-width:640px){
.auth-page{display:block;padding:16px}
.auth-shell{display:block;border-radius:24px;min-height:0}
.auth-card{padding:28px 20px}
.auth-card h2{margin:0 0 4px}
.head-actions #exportBtn{display:grid}
.title{max-width:38vw}
.modal-actions{display:grid;grid-template-columns:1fr}
.modal-actions button{width:100%}
.friend-tabs{gap:6px}
.friend-tab{padding:9px 6px;font-size:13px}
.remark-box{display:grid;grid-template-columns:1fr}
.profile-actions button,.profile-actions a{width:100%}
}
@media(max-width:420px){
.chat-head{padding-left:8px;padding-right:8px}
.head-actions{gap:4px}
.icon-btn{width:36px;height:36px;border-radius:13px}
.title{font-size:14px;max-width:28vw}
.sub{display:none}
.message{max-width:92%}
.auth-page{padding:10px}
.auth-card{padding:24px 16px}
.room-icon{width:34px;height:34px;border-radius:11px}
.room-item{gap:9px}
}
@media(max-height:520px) and (max-width:900px){
.auth-page{place-items:start center}
.auth-logo{display:none}
.auth-card{padding:18px}
.modal-card{max-height:var(--app-h)}
}