:root{
  --bg:#08111f;
  --panel:#0d1728;
  --panel2:#111d31;
  --line:#22324b;
  --text:#f5f7fb;
  --muted:#8fa0b9;
  --blue:#3b82f6;
  --blue2:#2563eb;
  --green:#22c55e;
  --red:#ef4444;
  --bubble:#16243a;
  --mine:#1f6feb;
  --shadow:0 18px 50px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{height:100%;min-height:0;margin:0;overflow:hidden;touch-action:manipulation;-webkit-text-size-adjust:100%;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea{font:inherit}
button{cursor:pointer}
.hidden{display:none!important}
html.auto-entering #authView{display:none!important}
.auto-enter{display:none;min-height:100%;place-items:center;color:var(--muted);font-size:15px}
html.auto-entering .auto-enter{display:grid}
.auth-view{min-height:100%;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 30% 20%,#17305c 0,#0b1424 32%,#07101c 75%)}
.auth-card{width:min(430px,100%);background:rgba(13,23,40,.96);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow)}
.brand{display:flex;gap:14px;align-items:center;margin-bottom:24px}
.brand-logo{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,#60a5fa,#2563eb);font-size:24px;font-weight:800}
.brand h1{font-size:24px;margin:0 0 5px}.brand p{margin:0;color:var(--muted);font-size:13px}
.tabs{display:grid;grid-template-columns:1fr 1fr;background:#091321;border:1px solid var(--line);padding:4px;border-radius:12px;margin-bottom:22px}
.tab{border:0;background:transparent;color:var(--muted);padding:10px;border-radius:9px}.tab.active{background:#17253b;color:#fff}
.auth-panel{display:none}.auth-panel.active{display:block}.auth-panel label,.modal-card label{display:block;color:#c6d0df;font-size:13px;margin:14px 0 7px}
input,textarea{width:100%;border:1px solid var(--line);background:#091321;color:#fff;border-radius:12px;outline:none;padding:12px 13px;font-size:16px;transition:.15s}
input:focus,textarea:focus{border-color:#4c8df6;box-shadow:0 0 0 3px rgba(59,130,246,.12)}
button{border:0;border-radius:10px;padding:10px 14px;color:#fff;background:#17253b}
.primary{background:linear-gradient(135deg,#3b82f6,#2563eb)}.secondary{background:#17253b;border:1px solid var(--line)}.ghost{background:transparent;border:1px solid var(--line)}.danger-btn{background:var(--red)}
.full{width:100%;margin-top:18px}.small{padding:7px 10px;font-size:12px}
.app{height:100vh;height:100dvh;min-height:0;display:grid;grid-template-columns:320px 1fr;overflow:hidden}
.sidebar{background:#0b1525;border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden;z-index:20}
.profile{height:74px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:12px;gap:10px}
.avatar-btn,.avatar{width:44px;height:44px;border-radius:50%;padding:0;overflow:hidden;background:#29446d;display:grid;place-items:center;flex:0 0 auto;font-weight:800}
.avatar img,.avatar-btn img{width:100%;height:100%;object-fit:cover;display:none}.profile-meta{min-width:0;flex:1}.profile-meta strong,.profile-meta span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.profile-meta span{font-size:12px;color:var(--muted);margin-top:3px}
.group-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px}.group-actions.single-action{grid-template-columns:1fr}.section-title{padding:8px 14px;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.08em}
.group-list{overflow:auto;flex:1 1 0;min-height:0;padding:0 8px 12px}
.group-item{display:grid;grid-template-columns:44px 1fr auto;gap:10px;align-items:center;padding:10px;border-radius:13px;margin:3px 0;cursor:pointer;border:1px solid transparent}.group-item:hover,.group-item.active{background:#111f33;border-color:#1e3353}
.group-icon{width:44px;height:44px;border-radius:13px;background:linear-gradient(135deg,#223b62,#17263e);display:grid;place-items:center;font-weight:800}.group-info{min-width:0}.group-info strong,.group-info span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.group-info span{font-size:12px;color:var(--muted);margin-top:5px}.group-side{display:flex;flex-direction:column;align-items:flex-end;gap:5px;color:var(--muted);font-size:11px}.badge{min-width:20px;height:20px;padding:0 6px;border-radius:10px;display:grid;place-items:center;background:var(--red);color:#fff;font-size:11px}
.chat{min-width:0;min-height:0;height:100%;overflow:hidden;display:flex;flex-direction:column;background:linear-gradient(180deg,#0a1322,#08111f)}
.topbar{height:74px;flex:0 0 74px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 16px;gap:10px;background:rgba(9,19,33,.9);backdrop-filter:blur(10px)}.topbar-main{flex:1;min-width:0}.topbar-main strong,.topbar-main span{display:block}.topbar-main strong{font-size:17px}.topbar-main span{margin-top:4px;font-size:12px;color:var(--muted)}.icon-btn{background:#132039;border:1px solid var(--line);padding:9px 12px}
.message-list{position:relative;flex:1 1 0;min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;overflow-anchor:none;padding:22px clamp(12px,3vw,36px) 34px}.message-list.loading-history:before{content:'正在加载更早消息…';position:absolute;top:8px;left:50%;transform:translateX(-50%);z-index:4;display:block;width:max-content;padding:5px 10px;border-radius:12px;background:rgba(17,31,51,.94);border:1px solid var(--line);color:var(--muted);font-size:11px;pointer-events:none}.history-end{text-align:center;color:var(--muted);font-size:11px;padding:2px 0 10px}.empty{height:100%;display:grid;place-items:center;color:var(--muted)}
.day-divider{text-align:center;color:var(--muted);font-size:11px;margin:16px 0}
.msg{display:flex;gap:9px;margin:13px 0;align-items:flex-start}.msg.mine{flex-direction:row-reverse}.msg-avatar{width:38px;height:38px;border-radius:50%;background:#284366;display:grid;place-items:center;overflow:hidden;flex:0 0 auto;font-size:12px}.msg-avatar img{width:100%;height:100%;object-fit:cover}.msg-body{max-width:min(72%,680px)}.msg-meta{font-size:11px;color:var(--muted);margin:0 4px 5px;display:flex;gap:7px;align-items:center}.mine .msg-meta{justify-content:flex-end}.role-tag{font-size:10px;padding:1px 5px;border:1px solid #365b87;border-radius:5px;color:#9dc6ff}.mention-tag{color:#fbbf24}
.bubble{position:relative;background:var(--bubble);border:1px solid #223754;border-radius:5px 14px 14px 14px;padding:10px 12px;word-break:break-word;line-height:1.55;white-space:pre-wrap}.mine .bubble{background:var(--mine);border-color:#2a7def;border-radius:14px 5px 14px 14px}.bubble.recalled{color:var(--muted);font-style:italic;background:#101b2b;border-style:dashed}.media-frame{display:block;overflow:hidden;border-radius:10px;background:#07101c}.image-frame{width:min(360px,65vw);aspect-ratio:4/3}.video-frame{width:min(440px,68vw);aspect-ratio:16/9;background:#000}.bubble img.chat-image,.bubble video{display:block;width:100%;height:100%;object-fit:contain}.bubble img.chat-image{cursor:zoom-in}.bubble audio{display:block;width:min(330px,66vw);height:40px}.bubble.voice-bubble{min-height:62px}.bubble.media-bubble{padding:5px;background:transparent;border:0}.mine .bubble.media-bubble{background:transparent;border:0}
.file-card{min-width:220px;display:flex;align-items:center;gap:10px;background:rgba(8,17,31,.35);border:1px solid rgba(255,255,255,.12);border-radius:11px;padding:10px}.file-icon{font-size:28px}.file-meta{min-width:0;flex:1}.file-meta strong,.file-meta span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-meta span{font-size:11px;opacity:.7;margin-top:3px}.file-download{padding:6px 9px;background:rgba(255,255,255,.14);font-size:12px}
.msg-footer{font-size:10px;color:var(--muted);margin:4px 4px 0}.mine .msg-footer{text-align:right}.msg-more{display:none;position:absolute;top:-9px;right:-9px;width:24px;height:24px;border-radius:50%;padding:0;background:#0b1525;border:1px solid #3b5579}.bubble:hover .msg-more{display:block}.mine .msg-more{right:auto;left:-9px}
.typing-bar{height:22px;flex:0 0 22px;padding:0 18px;color:var(--muted);font-size:11px}.media-tray{display:none;flex:0 0 auto;grid-template-columns:repeat(4,1fr);gap:10px;padding:12px 14px;border-top:1px solid var(--line);background:#0b1525}.media-tray.open{display:grid}.media-item{background:#121f33;border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;gap:5px;font-size:12px}.media-item span{font-size:21px}
.record-bar{height:54px;flex:0 0 54px;border-top:1px solid var(--line);background:#101b2b;display:flex;align-items:center;gap:10px;padding:8px 14px}.record-dot{width:10px;height:10px;border-radius:50%;background:var(--red);animation:pulse 1s infinite}.record-bar span:nth-of-type(2){color:var(--muted);font-size:12px}.record-bar .ghost{margin-left:auto}@keyframes pulse{50%{opacity:.35}}
.composer{flex:0 0 auto;border-top:1px solid var(--line);padding:10px 12px calc(10px + env(safe-area-inset-bottom));display:flex;gap:8px;align-items:flex-end;background:#0b1525}.composer textarea{resize:none;min-height:42px;max-height:120px;padding:10px 12px}.composer-btn{width:42px;height:42px;padding:0;font-size:22px;flex:0 0 auto}.send-btn{width:42px;height:42px;padding:0;background:var(--blue2);display:grid;place-items:center;flex:0 0 auto}.send-btn svg{width:20px;height:20px;fill:#fff;display:block}
.sidebar-mask{display:none}.mobile-only{display:none}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.62);display:none;align-items:center;justify-content:center;padding:18px;z-index:100}.modal.open{display:flex}.modal-card{width:min(560px,100%);max-height:min(82vh,760px);overflow:auto;background:#0d1728;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}.modal-card.compact{width:min(420px,100%)}.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.modal-head h2{font-size:18px;margin:0}.modal-head button{background:transparent;font-size:25px;padding:2px 8px;color:var(--muted)}
.invite-box{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;background:#0a1423;border:1px solid var(--line);padding:10px;border-radius:12px;margin-bottom:12px}.invite-box span{color:var(--muted);font-size:12px}.invite-box strong{letter-spacing:.12em}
.member-list{display:flex;flex-direction:column;gap:5px}.member-row{display:grid;grid-template-columns:42px 1fr auto;gap:10px;align-items:center;padding:9px;border-radius:11px}.member-row:hover{background:#121f33}.member-row .avatar{width:42px;height:42px}.member-info strong,.member-info span{display:block}.member-info span{color:var(--muted);font-size:11px;margin-top:3px}.member-actions{display:flex;gap:5px;align-items:center}.role-pill{padding:3px 7px;border-radius:8px;background:#162b48;color:#9fc7ff;font-size:10px}.muted-pill{padding:3px 7px;border-radius:8px;background:#4a1c1c;color:#fecaca;font-size:10px}.action-link{background:transparent;border:1px solid var(--line);padding:6px 8px;font-size:11px}
.profile-preview{display:flex;align-items:center;gap:14px;padding:12px 0}.avatar.large{width:68px;height:68px}.muted{color:var(--muted);font-size:12px;margin-top:4px}
.action-sheet{width:min(380px,100%);background:#0d1728;border:1px solid var(--line);border-radius:16px;padding:8px;box-shadow:var(--shadow);display:flex;flex-direction:column}.action-sheet button{background:transparent;border-bottom:1px solid #1b2a40;border-radius:0;padding:13px}.action-sheet button:last-child{border-bottom:0}.action-title{padding:11px 13px;color:var(--muted);font-size:12px}.danger-text{color:#f87171!important}
.image-viewer{position:fixed;inset:0;background:rgba(0,0,0,.92);display:none;align-items:center;justify-content:center;z-index:200;padding:20px}.image-viewer.open{display:flex}.image-viewer img{max-width:95vw;max-height:92vh;object-fit:contain}
.toast{position:fixed;left:50%;bottom:90px;transform:translate(-50%,18px);background:#111827;border:1px solid #334155;color:#fff;border-radius:10px;padding:10px 14px;opacity:0;pointer-events:none;transition:.2s;z-index:300;box-shadow:var(--shadow);font-size:13px}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:800px){
  .app{grid-template-columns:1fr}.sidebar{position:fixed;left:0;top:0;bottom:0;width:min(86vw,330px);transform:translateX(-105%);transition:.2s;box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.sidebar-mask.open{display:block;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:10}.mobile-only{display:inline-flex}.message-list{padding:14px 10px}.msg-body{max-width:80%}.topbar{height:66px}.profile{height:66px}.media-tray{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:460px){.auth-card{padding:20px;border-radius:18px}.composer{gap:5px;padding-left:7px;padding-right:7px}.composer-btn,.send-btn{width:38px}.msg-body{max-width:84%}.media-tray{gap:6px;padding:8px}.media-item{padding:8px 3px}.member-actions{flex-direction:column;align-items:flex-end}}