:root{
  --bg:#08111f;
  --bg-soft:#0b162b;
  --bg-elev:#0f1d38;
  --panel:rgba(10,18,34,.82);
  --panel-strong:rgba(12,23,44,.92);
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(96,195,255,.28);
  --text:#eff5ff;
  --muted:#8ea6c8;
  --accent:#67d7ff;
  --accent-2:#7b87ff;
  --accent-3:#4ce0c4;
  --bubble:#13233f;
  --bubble-me:#18365e;
  --danger:#ff7f9f;
  --success:#9bf0bc;
  --shadow:0 22px 70px rgba(0,0,0,.34);
  --radius:22px;
}
html[data-theme='light']{
  --bg:#eef4ff;
  --bg-soft:#f6f9ff;
  --bg-elev:#ffffff;
  --panel:rgba(255,255,255,.82);
  --panel-strong:rgba(255,255,255,.94);
  --line:rgba(18,48,94,.08);
  --line-strong:rgba(86,140,255,.2);
  --text:#10233f;
  --muted:#6d7f9d;
  --accent:#3ab8ff;
  --accent-2:#5b70ff;
  --accent-3:#18c8a4;
  --bubble:#ffffff;
  --bubble-me:#e8f2ff;
  --danger:#d94b74;
  --success:#1b8f59;
  --shadow:0 18px 52px rgba(50,70,100,.12);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;min-height:100%}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:radial-gradient(circle at top left,#102652 0,#071224 34%,#040913 100%);color:var(--text)}
html[data-theme='light'] body{background:radial-gradient(circle at top left,#d9e8ff 0,#eef4ff 48%,#f8fbff 100%)}
a{text-decoration:none;color:inherit}
button,input,textarea,select{font:inherit}
textarea{resize:none}
img{max-width:100%;display:block}
.hidden{display:none!important}
.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:11px;color:var(--muted)}
.primary-btn,.ghost-btn,.icon-btn,.theme-toggle,.switch-btn,.send-btn,.room-btn{transition:.18s ease;cursor:pointer}
.primary-btn,.ghost-btn,.switch-btn{border:none;border-radius:16px;padding:13px 16px}
.primary-btn{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04101e;font-weight:800;box-shadow:0 8px 24px rgba(64,172,255,.24)}
.ghost-btn{background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--text)}
html[data-theme='light'] .ghost-btn{background:#fff}
.primary-btn.small,.ghost-btn.small{padding:10px 13px;border-radius:13px}
.primary-btn:hover,.ghost-btn:hover,.icon-btn:hover,.theme-toggle:hover,.send-btn:hover,.room-btn:hover{transform:translateY(-1px)}
.wide-btn{width:100%}
input,textarea,select{width:100%;padding:14px 16px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--text);outline:none}
html[data-theme='light'] input,html[data-theme='light'] textarea,html[data-theme='light'] select{background:#fff}
input:focus,textarea:focus,select:focus{border-color:var(--line-strong);box-shadow:0 0 0 4px rgba(84,168,255,.08)}

/* auth */
.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:20px;position:relative;overflow:hidden}
.auth-ambient{position:absolute;border-radius:999px;filter:blur(90px);opacity:.34;animation:float 12s ease-in-out infinite}
.auth-ambient-a{width:340px;height:340px;background:#2567ff;top:-30px;left:-20px}
.auth-ambient-b{width:380px;height:380px;background:#00cfff;right:-60px;top:10%}
.auth-ambient-c{width:340px;height:340px;background:#17d6b3;left:30%;bottom:-90px}
.auth-panel{position:relative;z-index:2;width:min(100%,680px);padding:26px;border:1px solid var(--line);border-radius:30px;background:linear-gradient(180deg,var(--panel),var(--panel-strong));box-shadow:var(--shadow);backdrop-filter:blur(18px)}
.auth-topbar{display:flex;justify-content:space-between;align-items:center;gap:16px}
.brand-lockup{display:flex;align-items:center;gap:14px}
.brand-lockup.small strong{font-size:20px}
.brand-mark{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#07111f;font-weight:900;font-size:26px;box-shadow:0 12px 28px rgba(93,177,255,.24)}
.brand-mark.large{width:58px;height:58px;font-size:30px}
.auth-title{font-size:clamp(42px,10vw,74px);line-height:.95;margin:6px 0 0;font-weight:900;letter-spacing:-.04em}
.auth-copy{margin:18px 0 10px;color:var(--muted);max-width:540px;font-size:17px;line-height:1.6}
.theme-toggle{width:48px;height:48px;border-radius:14px;border:1px solid var(--line);background:rgba(255,255,255,.05);display:grid;place-items:center;position:relative}
.theme-toggle span{position:absolute;font-size:18px}
html[data-theme='dark'] .theme-toggle__sun{opacity:.5} html[data-theme='dark'] .theme-toggle__moon{opacity:1}
html[data-theme='light'] .theme-toggle__sun{opacity:1} html[data-theme='light'] .theme-toggle__moon{opacity:.4}
.auth-switcher{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:6px;margin-top:20px;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.04)}
.switch-btn{background:transparent;color:var(--muted)}
.switch-btn.active{background:linear-gradient(135deg,rgba(103,215,255,.18),rgba(123,135,255,.16));color:var(--text);border:1px solid var(--line-strong)}
.auth-pane{display:none;margin-top:18px}
.auth-pane.active{display:block;animation:fade .18s ease}
.stack-form{display:grid;gap:14px}
.stack-form label{display:grid;gap:8px;font-size:14px}
.stack-form label span{color:var(--muted)}
.hint-box,.alert,.welcome-chip,.notice-box,.reply-preview{border:1px solid var(--line);background:rgba(255,255,255,.04);padding:13px 15px;border-radius:16px;color:var(--muted)}
.form-message{min-height:22px;margin-top:10px}.success{color:var(--success)} .error{color:var(--danger)}
.install-panel{max-width:720px}.install-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}.install-grid .full{grid-column:1/-1}

/* app */
.app-shell{min-height:100vh;display:grid;grid-template-columns:280px minmax(0,1fr) 300px;gap:18px;padding:18px}
.nav-panel,.chat-column,.members-card{border:1px solid var(--line);background:linear-gradient(180deg,var(--panel),var(--panel-strong));backdrop-filter:blur(18px);box-shadow:var(--shadow)}
.nav-panel,.chat-column{border-radius:28px}
.nav-panel{padding:18px;display:flex;flex-direction:column;gap:16px}
.nav-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.profile-card{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--line);border-radius:20px;background:rgba(255,255,255,.04)}
.profile-avatar,.member-avatar{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(103,215,255,.24),rgba(123,135,255,.22));font-weight:800}
.profile-subline,.role-mini{font-size:12px;color:var(--muted);margin-top:3px}
.rooms-nav{display:grid;gap:8px}
.room-btn{display:flex;justify-content:space-between;align-items:center;padding:14px 15px;border-radius:18px;border:1px solid transparent;background:rgba(255,255,255,.03);color:var(--text);text-align:left}
.room-btn.active{background:linear-gradient(135deg,rgba(103,215,255,.16),rgba(123,135,255,.14));border-color:var(--line-strong)}
.room-btn__main{font-weight:600}
.room-btn__count{font-size:12px;color:var(--muted)}
.nav-actions{display:grid;gap:10px;margin-top:auto}
.chat-column{display:grid;grid-template-rows:auto minmax(280px,1fr) auto auto;overflow:hidden}
.chat-topbar{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:20px 20px 14px;border-bottom:1px solid var(--line)}
.chat-topbar h2{margin:0 0 5px;font-size:28px}.chat-topbar p{margin:0;color:var(--muted)}
.topbar-actions{display:flex;gap:10px;align-items:center}
.message-list{padding:18px 18px 10px;overflow:auto;display:grid;gap:10px;align-content:start;background:linear-gradient(180deg,rgba(255,255,255,.015),transparent)}
.message-row{display:flex;justify-content:flex-start}
.bubble{max-width:min(720px,92%);padding:10px 12px;border-radius:20px;border:1px solid var(--line);background:var(--bubble);box-shadow:0 10px 30px rgba(0,0,0,.08)}
.bubble-mine{background:var(--bubble-me)}
.bubble-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px}
.bubble-head strong{font-size:14px}.bubble-head time{font-size:12px;color:var(--muted)}
.message-body{line-height:1.55;word-break:break-word}
.quoted-reply{padding:8px 11px;border-left:3px solid var(--accent);border-radius:12px;background:rgba(255,255,255,.05);margin-bottom:8px;font-size:13px;color:var(--muted)}
.bubble-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.message-action,.reaction-pill{border:1px solid var(--line);background:rgba(255,255,255,.05);color:var(--muted);padding:6px 10px;border-radius:999px;font-size:12px}
.message-action.danger{color:var(--danger)}
.voice-message{display:grid;gap:8px}.voice-message__top{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px}.voice-tag{font-weight:700;color:var(--text)}
.voice-message audio{width:100%;height:40px;border-radius:999px}
.message-image{border-radius:16px;max-height:320px;object-fit:cover;border:1px solid var(--line)}
.image-caption,.file-caption{margin-top:8px}
.attachment-card{display:flex;align-items:center;gap:12px}
.attachment-card.image-card{display:block}
.file-card{padding:10px 12px;border-radius:16px;background:rgba(255,255,255,.05);border:1px solid var(--line)}
.file-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:rgba(255,255,255,.06)}
.file-meta{display:grid;gap:4px;flex:1;min-width:0}.file-meta strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-meta span{font-size:12px;color:var(--muted)}
.reply-preview{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 18px 12px}
.reply-preview button{border:none;background:none;color:var(--muted);font-size:18px;cursor:pointer}
.composer-wrap{padding:0 18px 18px}
.record-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--line-strong);background:rgba(103,215,255,.08);padding:12px 14px;border-radius:18px;margin-bottom:10px}
.record-strip__live{display:flex;align-items:center;gap:8px;font-weight:600}.record-dot{width:9px;height:9px;border-radius:50%;background:#ff617f;box-shadow:0 0 0 0 rgba(255,97,127,.44);animation:pulse 1.5s infinite}
.record-strip__timer{font-weight:800}.record-strip__actions{display:flex;gap:8px}
.composer-shell{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:end;padding:12px;border-radius:24px;border:1px solid var(--line);background:rgba(255,255,255,.04)}
.composer-actions{display:flex;gap:8px;align-items:flex-end}
.icon-btn,.attach-btn{width:44px;height:44px;border-radius:14px;border:1px solid var(--line);background:rgba(255,255,255,.05);display:grid;place-items:center;color:var(--text)}
.attach-btn{position:relative;overflow:hidden}
.composer-main{position:relative}
#messageInput{min-height:48px;max-height:150px;padding:12px 14px;border-radius:16px;background:transparent;border:none;box-shadow:none}
#messageInput:focus{box-shadow:none}
.send-btn{width:52px;height:52px;border:none;border-radius:18px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#05111f;font-weight:900;font-size:18px;box-shadow:0 10px 24px rgba(89,164,255,.24)}
.composer-status{padding:8px 4px 0;font-size:13px;color:var(--muted);min-height:24px}.composer-status.error{color:var(--danger)}
.emoji-picker{position:absolute;left:0;bottom:calc(100% + 12px);width:min(330px,90vw);padding:10px;border-radius:18px;border:1px solid var(--line);background:var(--panel-strong);display:grid;grid-template-columns:repeat(6,1fr);gap:7px;box-shadow:var(--shadow);z-index:4}
.emoji-choice{border:none;border-radius:12px;padding:8px;background:rgba(255,255,255,.05)}
.members-column{display:block}.members-card{border-radius:28px;padding:18px;height:100%}
.members-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.members-head h3{margin:0}
.members-list{display:grid;gap:10px;margin:14px 0}.member-row{display:flex;justify-content:space-between;align-items:center;padding:12px;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.04)}
.member-main{display:flex;align-items:center;gap:10px}.presence{padding:7px 10px;border-radius:999px;border:1px solid var(--line);font-size:12px}.presence.online{color:#a7f0c3}.presence.offline{color:var(--muted)}
.soft-badge{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.05);font-size:12px;color:var(--muted)}

@keyframes float{50%{transform:translateY(18px) translateX(12px) scale(1.06)}}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(255,97,127,0)}}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

@media (max-width:1180px){
  .app-shell{grid-template-columns:260px minmax(0,1fr)}
  .members-column{grid-column:1/-1}
  .members-card{height:auto}
}
@media (max-width:860px){
  .app-shell{grid-template-columns:1fr;padding:12px;gap:12px}
  .nav-panel,.chat-column,.members-card{border-radius:24px}
  .chat-column{order:1}
  .nav-panel{order:2}
  .members-column{order:3}
  .chat-topbar{padding:16px}
  .message-list{padding:14px}
  .composer-wrap{padding:0 14px 14px}
  .bubble{max-width:100%}
}
@media (max-width:640px){
  .auth-panel{padding:20px;border-radius:24px}
  .auth-title{font-size:54px}
  .auth-topbar,.chat-topbar{align-items:flex-start}
  .topbar-actions{flex-wrap:wrap;justify-content:flex-end}
  .composer-shell{grid-template-columns:1fr auto;grid-template-areas:'main send' 'actions send'}
  .composer-actions{grid-area:actions}
  .composer-main{grid-area:main}
  .send-btn{grid-area:send;align-self:end}
  .emoji-picker{left:auto;right:0;grid-template-columns:repeat(5,1fr)}
  .record-strip{display:grid;grid-template-columns:1fr auto;align-items:center}
  .record-strip__actions{grid-column:1/-1}
  .install-grid{grid-template-columns:1fr}
}

/* v5 recording waveform */
.record-strip{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 14px;border-radius:24px;background:var(--panel);border:1px solid var(--line-strong);box-shadow:var(--shadow-soft)}
.record-strip__left,.record-strip__right{display:flex;align-items:center;gap:14px}
.record-wave-shell{display:flex;align-items:center;gap:12px;min-width:0}
.record-wave{display:block;width:min(56vw,560px);height:56px;background:transparent}
.record-icon-btn,.record-send-btn{width:44px;height:44px;border-radius:999px;border:1px solid var(--line-strong);background:var(--panel-strong);font-size:22px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}
.record-send-btn{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#0d1426;border:none;box-shadow:0 12px 22px rgba(60,125,255,.22)}
.record-strip__timer{font-size:18px;font-weight:800;min-width:52px;text-align:center}
.composer-status{min-height:18px}
@media (max-width: 920px){
  .record-strip{padding:10px 12px;gap:12px}
  .record-wave{width:100%;max-width:100%;height:44px}
  .record-strip__left{flex:1;min-width:0}
  .record-wave-shell{min-width:0;flex:1}
}
@media (max-width: 640px){
  .record-strip{border-radius:20px}
  .record-strip__timer{font-size:16px;min-width:auto}
  .record-icon-btn,.record-send-btn{width:40px;height:40px;font-size:20px}
  .record-wave{height:38px}
}

.member-chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:flex-end}
.presence.voice{color:var(--accent)}
.presence.speaking{color:var(--accent-3);border-color:rgba(76,224,196,.35);box-shadow:0 0 0 3px rgba(76,224,196,.08)}
.member-row-speaking{border-color:rgba(76,224,196,.32);background:rgba(76,224,196,.05)}