:root{
  --bg1:#071b1e;
  --bg2:#083237;

  --card:#0b2b30cc;
  --text:#e9f1f2;
  --muted:#b5c9cc;

  --green:#25D366;
  --bubbleIn:#0f2f33;
  --bubbleOut:#1d5f40;

  --border:rgba(255,255,255,.08);
  --shadow: 0 18px 50px rgba(0,0,0,.35);
  --radius:22px;

  --kb: 0px;
}

*{ box-sizing:border-box; }
html,body{
  height:100%;
  margin:0;
  font-family: system-ui,-apple-system,Segoe UI,Roboto,Arial;
  color:var(--text);
}

/* remove blue highlight */
html, body, *{ -webkit-tap-highlight-color: rgba(0,0,0,0); }
button, .btn, .chatRow, .navBtn, .iconBtn{
  user-select:none;
  -webkit-user-select:none;
  touch-action: manipulation;
}
:focus{ outline:none; }
:focus-visible{
  outline: 2px solid rgba(37,211,102,.55);
  outline-offset: 3px;
  border-radius: 14px;
}

/* background */
.bg{
  position:fixed; inset:0;
  background:
    radial-gradient(1200px 800px at 20% 15%, rgba(37,211,102,.18), transparent 55%),
    radial-gradient(1000px 700px at 80% 25%, rgba(0,180,255,.14), transparent 55%),
    radial-gradient(900px 700px at 35% 85%, rgba(255,0,180,.10), transparent 60%),
    linear-gradient(140deg, var(--bg1), var(--bg2));
  filter:saturate(1.15);
  animation: floaty 10s ease-in-out infinite alternate;
  pointer-events:none;
  z-index:-1;
}
@keyframes floaty{
  0%{ transform: translate3d(0,0,0) scale(1); }
  100%{ transform: translate3d(0,-10px,0) scale(1.02); }
}

/* topbar */
.topbar{
  position:sticky; top:0;
  padding: 14px 14px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 12px;

  min-height: 74px;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(0,0,0,.28), rgba(0,0,0,.06));
  border-bottom:1px solid var(--border);
}

.brandWrap{
  display:flex;
  flex-direction:column;
  min-width:0;
  flex: 1;
}

.brand{
  font-size:32px;
  font-weight:900;
  letter-spacing:.2px;
  line-height:1.05;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.subtitle{
  color:var(--muted);
  margin-top:3px;
  font-size:13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topActions{
  display:flex;
  gap:10px;
  align-items:center;
  justify-content:flex-end;
  flex-shrink:0;
  width: auto;
  max-width: 50%;
}

/* dvh for mobile */
.screen{
  min-height: calc(100dvh - 74px);
  padding: 16px;
  display:flex;
  justify-content:center;
  align-items:flex-start;
}
.hidden{ display:none !important; }

.card{
  width:min(720px, 100%);
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* login */
.loginCard{
  margin-top: clamp(40px, 10vh, 120px);
  padding: 24px;
}
.loginCard h1{ margin:0 0 18px 0; font-size:40px; }

.input{
  width:100%;
  padding: 16px 18px;
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.92);
  color:#0b1213;
  outline:none;
  font-size:16px;
  margin-bottom: 14px;
}
.row{ display:flex; gap:12px; }

.btn{
  border:0;
  cursor:pointer;
  transition: transform .08s ease, filter .2s ease;
}
.btn:active{ transform: scale(.98); }

.pill{ border-radius: 999px; padding: 12px 16px; min-width: 110px; }
.circle{
  width:48px; height:48px;
  border-radius: 999px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:18px;
  font-weight:700;
}

.green{
  background: var(--green);
  color:#063014;
  box-shadow: 0 10px 24px rgba(37,211,102,.22);
}
.green:hover{ filter:brightness(1.05); }

.greenOutline{
  background: rgba(0,0,0,.12);
  color: var(--text);
  border: 1px solid rgba(37,211,102,.65);
}

/* Install & Logout responsive */
#btnInstall, .logoutBtn{
  width: auto;
  min-width: 88px;
  max-width: 140px;
  height: 40px;
  padding: 0 14px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius: 999px;
  font-weight: 800;
  letter-spacing: .2px;
  white-space: nowrap;
}

#btnInstall{
  background: rgba(0,0,0,.14);
  border: 1px solid rgba(255,255,255,.70);
}
#btnInstall:hover{ filter: brightness(1.06); }

.logoutBtn{
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18);
  backdrop-filter: blur(10px);
}
.logoutBtn:hover{ filter: brightness(1.06); }

.tip{
  color: var(--muted);
  margin: 10px 0 0 0;
  font-size: 15px;
  line-height: 1.5;
}
.msg{ margin: 10px 0 0 0; color: #ffd9d9; min-height: 20px; }

/* list */
.listCard{ padding: 16px; margin-bottom: 74px; }
.listHead{ display:flex; justify-content:space-between; align-items:center; padding: 4px 6px 10px; }
.h{ font-size:24px; font-weight:900; }
.s{ color:var(--muted); font-size:14px; margin-top:2px; }

.addRow{ display:flex; gap:12px; align-items:center; margin: 12px 0 14px; }
.pillInput{
  margin:0;
  background: rgba(0,0,0,.28);
  color: var(--text);
  border:1px solid rgba(255,255,255,.10);
}
.pillInput::placeholder{ color: rgba(255,255,255,.6); }

.chatList{ display:flex; flex-direction:column; gap: 10px; padding: 8px 0; }
.chatRow{
  display:flex; gap: 12px;
  padding: 14px 12px;
  border-radius: 18px;
  background: rgba(0,0,0,.18);
  border:1px solid rgba(255,255,255,.06);
}
.chatRow:hover{ background: rgba(0,0,0,.22); }
.chatRow:active{ transform: scale(.99); }

.avatar{
  width:46px; height:46px;
  border-radius: 999px;
  background: rgba(255,255,255,.12);
  display:flex; align-items:center; justify-content:center;
  font-weight:900;
}

.mid{ flex:1; min-width:0; }
.name{ font-size:17px; font-weight:900; }
.last{
  color: var(--muted);
  font-size:14px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  margin-top:2px;
}

.right{ display:flex; flex-direction:column; align-items:flex-end; gap: 8px; }
.time{ color: rgba(255,255,255,.65); font-size:12px; }
.badges{ display:flex; align-items:center; gap:8px; }
.dot{ width:10px; height:10px; border-radius:999px; background: var(--green); }
.unread{
  min-width: 26px; height: 26px; padding: 0 8px;
  border-radius: 999px;
  background: var(--green);
  color:#063014;
  display:inline-flex; align-items:center; justify-content:center;
  font-weight:900; font-size: 13px;
}

/* bottom nav */
.bottomNav{
  position:fixed; left:0; right:0; bottom:0;
  display:flex; justify-content:space-around;
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  background: rgba(0,0,0,.35);
  backdrop-filter: blur(12px);
  border-top:1px solid var(--border);
}
.navBtn{
  background: transparent;
  border:0;
  color: rgba(255,255,255,.75);
  font-weight:900;
  padding: 10px 12px;
  border-radius: 14px;
}
.navBtn.active{ color: var(--text); background: rgba(37,211,102,.18); }

/* chat */
.chatShell{
  width:min(720px, 100%);
  height: calc(100dvh - 110px);
  display:flex;
  flex-direction:column;
  padding: 0;
  overflow:hidden;
}

.chatTop{
  display:flex;
  align-items:center;
  gap: 10px;
  padding: 10px 12px;
  min-height: 56px;
  border-bottom:1px solid var(--border);
  background: rgba(0,0,0,.18);
}
.iconBtn{
  width:40px; height:40px;
  border-radius: 999px;
  background: rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.12);
  color: var(--text);
  font-size:18px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}
.chatTitleWrap{
  flex:1;
  min-width:0;
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.chatTitle{ font-weight:900; font-size:17px; line-height:1.2; }
.chatStatus{ color: var(--muted); font-size:12px; line-height:1.2; margin-top:2px; }

.messages{
  flex:1;
  padding: 14px 12px;
  overflow:auto;
  display:flex;
  flex-direction:column;
  gap: 10px;
  scroll-behavior:smooth;
}
.messages::-webkit-scrollbar{ width: 8px; }
.messages::-webkit-scrollbar-thumb{ background: rgba(255,255,255,.12); border-radius: 999px; }

.bubble{
  max-width: 82%;
  padding: 12px 12px;
  border-radius: 16px;
  border:1px solid rgba(255,255,255,.08);
  background: rgba(15,47,51,.92);
  box-shadow: 0 8px 24px rgba(0,0,0,.18);
}
.bubble.me{
  margin-left:auto;
  background: rgba(29,95,64,.92);
}
.meta{
  margin-top:6px;
  font-size: 11px;
  opacity:.78;
  text-align:right;
}
.seen{
  margin-top: 4px;
  font-size: 11px;
  opacity: .75;
  text-align: right;
}

/* composer */
.composer{
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  display:flex;
  gap: 10px;
  border-top:1px solid var(--border);
  background: rgba(0,0,0,.16);
}
.msgInput{
  margin:0;
  background: rgba(0,0,0,.28);
  color: var(--text);
  border:1px solid rgba(255,255,255,.12);
}
.msgInput::placeholder{ color: rgba(255,255,255,.6); }
.sendBtn{ font-size:18px; }

@media (max-width: 420px){
  .topbar{ padding: 12px 12px; }
  .brand{ font-size: 28px; }
  #btnInstall, .logoutBtn{
    min-width: 80px;
    max-width: 118px;
    height: 38px;
    padding: 0 12px;
    font-size: 14px;
  }
}
@media (max-width: 360px){
  .brand{ font-size: 26px; }
  #btnInstall, .logoutBtn{
    min-width: 76px;
    max-width: 108px;
  }
}