:root{
  --bg:#0e1621;
  --bg2:#101b2a;
  --panel:#17212b;
  --panel-2:#1e2c3a;
  --panel-3:#243447;
  --glass-1:rgba(23,33,43,.9);
  --glass-2:rgba(23,33,43,.84);
  --glass-3:rgba(27,39,53,.9);
  --drawer-bg:rgba(24,37,51,.98);
  --empty-bg:rgba(30,44,58,.5);
  --border:rgba(255,255,255,.09);
  --border-2:rgba(255,255,255,.16);

  --text:#e7eef7;
  --muted:#8fa3bb;
  --muted-2:#6f869f;

  --primary:#5ea8ff;
  --primary-weak:rgba(94,168,255,.16);
  --ok:#39d183;
  --warn:#ffcf69;
  --danger:#ff8585;

  --bubble-me:#2b5278;
  --bubble-them:#1f2c38;
  --bubble-deleted:rgba(255,133,133,.14);

  --shadow:0 14px 28px rgba(0,0,0,.3);
  --shadow-soft:0 6px 14px rgba(0,0,0,.2);

  --font:system-ui,-apple-system,"SF Pro Text","Segoe UI",Roboto,"PingFang SC","Noto Sans CJK SC",sans-serif;
  --tabbar-h:64px;
}

@media (prefers-color-scheme: light){
  :root{
    --bg:#e8eef6;
    --bg2:#dae5f2;
    --panel:#ffffff;
    --panel-2:#f4f7fb;
    --panel-3:#ecf1f8;
    --glass-1:rgba(255,255,255,.88);
    --glass-2:rgba(255,255,255,.84);
    --glass-3:rgba(246,249,253,.9);
    --drawer-bg:rgba(255,255,255,.97);
    --empty-bg:rgba(244,247,251,.76);
    --border:rgba(16,34,56,.12);
    --border-2:rgba(16,34,56,.2);

    --text:#122841;
    --muted:#4e6580;
    --muted-2:#6d8199;

    --primary:#2f86f5;
    --primary-weak:rgba(47,134,245,.12);

    --bubble-me:#d9eafe;
    --bubble-them:#ffffff;

    --shadow:0 12px 24px rgba(27,44,67,.14);
    --shadow-soft:0 4px 10px rgba(27,44,67,.1);
  }
}

*{ box-sizing:border-box; }
html,body{ height:100%; margin:0; }

body{
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(1200px 550px at -15% -20%, rgba(94,168,255,.18), transparent),
    radial-gradient(900px 520px at 110% -20%, rgba(57,209,131,.09), transparent),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
  -webkit-font-smoothing:antialiased;
}

button,input,select{
  font-family:inherit;
  font-size:16px;
  color:inherit;
}

.appShell{
  height:100%;
  min-height:100dvh;
  display:flex;
  flex-direction:column;
  overflow:hidden;
}

.topbar{
  min-height:58px;
  border-bottom:1px solid var(--border);
  background:var(--glass-1);
  backdrop-filter:blur(14px);

  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 14px;
}

.brandWrap{ display:flex; align-items:center; min-width:0; gap:10px; }
.brandMeta{ min-width:0; }

.avatar{
  width:38px;
  height:38px;
  border-radius:12px;
  display:grid;
  place-items:center;
  font-weight:800;
  color:#06203f;
  background:linear-gradient(145deg,#80beff,#4bd196);
  box-shadow:var(--shadow-soft);
}

.brandTitle{ font-size:14px; font-weight:800; letter-spacing:.2px; }

.brandSub{
  font-size:12px;
  color:var(--muted);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.topActions{ display:flex; align-items:center; gap:8px; }

.pill{
  height:30px;
  display:inline-flex;
  align-items:center;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  padding:0 10px;
}

.iconBtn{
  min-width:36px;
  height:36px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--text);
  padding:0 12px;
  cursor:pointer;
}

.iconBtn:hover{ background:var(--panel-3); }

.workspace{
  flex:1;
  min-height:0;
  position:relative;
  overflow:hidden;
}

.page{
  position:absolute;
  inset:0;
  min-height:0;
  display:flex;
  flex-direction:column;
  background:var(--glass-2);
  transition:transform .26s ease, opacity .26s ease;
}

.page[aria-hidden="true"]{
  pointer-events:none;
  opacity:0;
  transform:translateX(8%);
}

.page[aria-hidden="false"]{
  opacity:1;
  transform:none;
}

.page-chats{
  border-right:1px solid var(--border);
}

.sidebarTop{
  border-bottom:1px solid var(--border);
  background:var(--glass-1);
}

.searchBar{ padding:12px; }

.searchBar input{
  width:100%;
  height:40px;
  border-radius:12px;
  border:1px solid var(--border);
  background:var(--panel-2);
  padding:0 12px;
  outline:none;
}

.searchBar input:focus{
  border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-weak);
}

.sidebarHead{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:0 14px 10px;
}

.sidebarTitle{
  font-size:12px;
  color:var(--muted);
  font-weight:800;
  letter-spacing:.4px;
  text-transform:uppercase;
}

.sidebarMeta{ font-size:12px; color:var(--muted-2); }

.chatList{
  flex:1;
  overflow:auto;
  padding:8px;
  -webkit-overflow-scrolling:touch;
}

.chatItem{
  display:flex;
  align-items:flex-start;
  gap:10px;
  border-radius:12px;
  padding:10px;
  border:1px solid transparent;
  cursor:pointer;
  transition:background .18s ease, border-color .18s ease;
}

.chatItem:hover{ background:var(--panel-2); }

.chatItem.active{
  background:var(--primary-weak);
  border-color:rgba(94,168,255,.45);
}

.chatAvatar{
  width:42px;
  height:42px;
  border-radius:12px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  font-weight:800;
  font-size:13px;
  border:1px solid var(--border);
  background:linear-gradient(145deg,var(--panel-3),var(--panel-2));
}

.chatBody{ flex:1; min-width:0; }

.chatTop{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}

.chatName{
  font-size:13px;
  font-weight:760;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.chatTime{ font-size:11px; color:var(--muted-2); }

.chatPreview{
  margin-top:2px;
  font-size:12px;
  color:var(--muted);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.chatFlags{
  margin-top:7px;
  display:flex;
  flex-wrap:wrap;
  gap:6px;
}

.flag{
  height:20px;
  display:inline-flex;
  align-items:center;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--muted-2);
  font-size:10px;
  font-weight:700;
  padding:0 7px;
}

.flag.on{
  border-color:rgba(57,209,131,.48);
  background:rgba(57,209,131,.14);
  color:var(--ok);
}

.flag.off{
  border-color:rgba(255,133,133,.48);
  background:rgba(255,133,133,.14);
  color:var(--danger);
}

.flag.source{ color:var(--muted); }

.contentHead{
  border-bottom:1px solid var(--border);
  background:var(--glass-3);
  padding:12px 14px;

  display:flex;
  flex-direction:column;
  gap:10px;
}

.chatHeadTitle{ font-size:15px; font-weight:800; }
.chatHeadSub{ margin-top:2px; font-size:12px; color:var(--muted); }

.chatPolicy{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}

.policyBadge{
  height:26px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  padding:0 10px;
  display:inline-flex;
  align-items:center;
}

.policyBadge.is-on{
  border-color:rgba(57,209,131,.5);
  background:rgba(57,209,131,.14);
  color:var(--ok);
}

.policyBadge.is-off{
  border-color:rgba(255,133,133,.5);
  background:rgba(255,133,133,.14);
  color:var(--danger);
}

.policyBadge.muted{ color:var(--muted-2); }

.contentActions{ display:flex; gap:8px; }

.msgPane{
  flex:1;
  overflow:auto;
  padding:14px;
  -webkit-overflow-scrolling:touch;
  overscroll-behavior:contain;
}

.msgRow{ display:flex; margin:7px 0; }
.msgRow.me{ justify-content:flex-end; }
.msgRow.them{ justify-content:flex-start; }

.bubble{
  max-width:min(82%, 760px);
  border-radius:14px;
  border:1px solid var(--border);
  box-shadow:var(--shadow-soft);
  padding:8px 10px;
}

.msgRow.me .bubble{
  background:var(--bubble-me);
  border-color:rgba(94,168,255,.44);
}

.msgRow.them .bubble{ background:var(--bubble-them); }

.bubble.deleted{
  background:var(--bubble-deleted);
  border-color:rgba(255,133,133,.52);
}

.bubble .meta{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:8px;
  margin-bottom:4px;
  font-size:11px;
  color:var(--muted-2);
}

.bubble .sender{ display:none; }
.msgRow.them .bubble .sender{ display:block; font-weight:700; }

.bubble .text,
.diffText{
  font-size:13px;
  line-height:1.42;
  white-space:pre-wrap;
  word-break:break-word;
}

.bubble .text.deletedText{
  color:var(--muted);
  text-decoration:line-through;
}

.msgTags{ display:flex; flex-wrap:wrap; gap:6px; margin-bottom:6px; }

.msgTag{
  height:20px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--muted);
  font-size:11px;
  font-weight:700;
  padding:0 8px;
  display:inline-flex;
  align-items:center;
}

.msgTag.edited{
  border-color:rgba(94,168,255,.5);
  background:rgba(94,168,255,.14);
  color:var(--primary);
}

.msgTag.deleted{
  border-color:rgba(255,133,133,.5);
  background:rgba(255,133,133,.16);
  color:var(--danger);
}

.diffWrap{ display:flex; flex-direction:column; gap:8px; }

.diffItem{
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--panel-2);
  padding:8px;
}

.diffItem.old{
  border-color:rgba(255,133,133,.35);
  background:rgba(255,133,133,.08);
}

.diffItem.new{
  border-color:rgba(57,209,131,.35);
  background:rgba(57,209,131,.1);
}

.diffLabel{
  margin-bottom:4px;
  font-size:11px;
  font-weight:800;
  color:var(--muted-2);
}

.contentFoot{
  border-top:1px solid var(--border);
  background:var(--glass-3);
  min-height:42px;
  padding:8px 14px;

  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
}

.hint{
  min-width:0;
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--muted);
  font-size:12px;
}

.dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--muted-2);
  flex:0 0 auto;
}

#hintText{
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.metaPill{
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--muted);
  font-size:12px;
  padding:5px 10px;
  white-space:nowrap;
}

.btn{
  min-height:36px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--panel-2);
  color:var(--text);
  padding:8px 12px;
  font-weight:700;
  cursor:pointer;
}

.btn:hover{ background:var(--panel-3); }

.btn.primary{
  border-color:rgba(94,168,255,.55);
  background:linear-gradient(180deg,#77b8ff,#5ea8ff);
  color:#052346;
}

.btn.danger{
  border-color:rgba(255,133,133,.55);
  background:rgba(255,133,133,.14);
  color:#ffd4d4;
}

.btn.ghost{
  background:transparent;
  border-color:var(--border-2);
}

.btn.full{ width:100%; }

.btn.sm{
  min-height:30px;
  padding:4px 10px;
  font-size:12px;
}

.emptyState,
.emptyHint{
  border:1px dashed var(--border);
  border-radius:12px;
  background:var(--empty-bg);
  color:var(--muted);
  text-align:center;
  min-height:140px;
  padding:14px;

  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
}

.emptyTitle{ color:var(--text); font-weight:700; }
.emptySub{ margin-top:4px; font-size:12px; }

.settings{
  position:fixed;
  top:0;
  right:0;
  width:420px;
  max-width:96vw;
  height:100%;
  z-index:40;

  display:flex;
  flex-direction:column;

  border-left:1px solid var(--border-2);
  background:var(--drawer-bg);
  box-shadow:var(--shadow);

  transform:translateX(104%);
  transition:transform .24s ease;
}

.settings.open{ transform:none; }

.settingsHead{
  padding:14px;
  border-bottom:1px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.settingsTitle{ font-size:16px; font-weight:800; }
.settingsSub{ font-size:12px; color:var(--muted); }

.settingsBody{
  flex:1;
  overflow:auto;
  padding:14px;
}

.panel{
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--panel-2);
  padding:12px;
  margin-bottom:12px;
}

.panel.subtle{ background:rgba(30,44,58,.68); }

.panelTitle{ font-size:13px; font-weight:800; margin-bottom:6px; }
.panelSub{ font-size:12px; color:var(--muted); margin-bottom:10px; }

.formGrid{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
  margin-bottom:12px;
}

.formGrid.twoCols{ grid-template-columns:1fr 1fr; }

.field{ display:flex; flex-direction:column; gap:6px; }

.field > span{ font-size:12px; color:var(--muted); font-weight:700; }

.field select,
.field input{
  width:100%;
  height:38px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--panel);
  padding:0 10px;
  outline:none;
}

.field select:focus,
.field input:focus{
  border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-weak);
}

.row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}

.bullets{
  margin:0;
  padding-left:18px;
  color:var(--muted);
  font-size:12px;
  line-height:1.48;
}

.backdrop{
  position:fixed;
  inset:0;
  z-index:30;
  background:rgba(5,12,20,.56);
}

.tabbar{
  height:var(--tabbar-h);
  border-top:1px solid var(--border);
  background:rgba(24,37,51,.94);
  backdrop-filter:blur(12px);
  padding-bottom:env(safe-area-inset-bottom);
  display:flex;
}

.tab{
  flex:1;
  border:0;
  background:none;
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  cursor:pointer;
  touch-action:manipulation;
}

.tab.active{ color:var(--primary); }

@media (min-width: 980px){
  .topbar{ padding:10px 18px; }

  .workspace{
    display:grid;
    grid-template-columns:340px minmax(560px, 1fr);
  }

  .page-chats,
  .page-messages{
    position:relative;
    transform:none !important;
    opacity:1 !important;
    pointer-events:auto !important;
  }

  .page-messages{ border-left:1px solid var(--border); }
  .tabbar{ display:none; }
}

@media (max-width: 820px){
  .formGrid.twoCols,
  .row{ grid-template-columns:1fr; }

  .chatPolicy .btn.sm{ width:100%; }
}

@media (max-width: 640px){
  .pill{
    max-width:120px;
    overflow:hidden;
    text-overflow:ellipsis;
  }

  .contentFoot{
    flex-direction:column;
    align-items:flex-start;
  }

  .metaPill{ align-self:flex-end; }
}

@media (max-width: 480px){
  .settings{
    width:100%;
    max-width:100%;
  }

  .searchBar,
  .contentHead,
  .msgPane,
  .contentFoot,
  .settingsHead,
  .settingsBody{ padding-left:12px; padding-right:12px; }
}