body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.chat-container {
  width: 100%;
  max-width: 480px;
  height: 90vh;
  background: #242424;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.chat-header {
  background: #334155;
  padding: 16px 20px;
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.install-btn {
  margin-left: auto;
  padding: 6px 10px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: #279ff0;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    background 0.2s,
    color 0.2s;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.install-btn svg {
  width: clamp(1.3rem, 1.5vw, 2.4rem);
  height: clamp(1.3rem, 1.5vw, 2.4rem);
}
.install-btn:hover {
  background: #279ff0;
  color: white;
}
/* Mobile: icon only */
.install-label {
  display: none;
}
/* Desktop: show label as pill */
@media (min-width: 481px) {
  .install-btn {
    border: 1px solid #279ff0;
    border-radius: 16px;
    padding: 6px 14px;
  }
  .install-btn svg {
    width: clamp(1.3rem, 1.5vw, 2.4rem);
    height: clamp(1.3rem, 1.5vw, 2.4rem);
  }
  .install-label {
    display: inline;
    font-size: clamp(1.3rem, 1.5vw, 2.4rem);
  }
}
.status-dot {
  width: 10px;
  height: 10px;
  background: #22c55e;
  border-radius: 50%;
}
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.message {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 12px;
  line-height: 1.4;
  word-wrap: break-word;
  animation: fadeIn 0.2s ease;
}
.message.own {
  align-self: flex-end;
  background: #3b82f6;
  color: white;
  border-bottom-right-radius: 4px;
}
.message.other {
  align-self: flex-start;
  background: #475569;
  border-bottom-left-radius: 4px;
}
.input-area {
  padding: 16px;
  background: #334155;
  display: flex;
  gap: 10px;
}
#messageInput {
  flex: 1;
  padding: 12px 16px;
  border: none;
  border-radius: 24px;
  background: #1e293b;
  color: #e2e8f0;
  font-size: 1rem;
  outline: none;
}
#messageInput::placeholder {
  color: #94a3b8;
}
#sendBtn {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: #279ff0;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.2s;
}
#sendBtn:hover {
  background: #579ff0;
}
#messages::-webkit-scrollbar {
  width: 6px;
}
#messages::-webkit-scrollbar-thumb {
  background: #475569;
  border-radius: 3px;
}
/* --- Name Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}
.modal-box {
  background: #1e293b;
  border-radius: 16px;
  padding: 32px;
  width: 350px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  text-align: center;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.modal-box h2 {
  margin: 0 0 8px;
  color: #e2e8f0;
}
.modal-box p {
  color: #94a3b8;
  margin: 0 0 20px;
}
#nameInput {
  width: 45%;
  padding: 12px 16px;
  border: none;
  border-radius: 24px;
  background: #0f172a;
  color: #e2e8f0;
  font-size: 1rem;
  outline: none;
  box-sizing: border-box;
}
#nameInput::placeholder {
  color: #64748b;
}
#joinBtn {
  margin-top: 16px;
  padding: 12px 32px;
  border: none;
  border-radius: 24px;
  background: #279ff0;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
#joinBtn:hover {
  background: #579ff0;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}