*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:Arial;
}

body{
  background:#070b14;
  color:white;
  height:100dvh;
  overflow:hidden;
}

.app{
  display:flex;
  height:100dvh;
}

/* SIDEBAR */

.sidebar{
  width:350px;
  background:#0d1320;
  border-right:1px solid #1f2a44;
  display:flex;
  flex-direction:column;
  padding:20px;
}

.logo{
  font-size:30px;
  font-weight:bold;
  color:#00c3ff;
  margin-bottom:25px;
  text-shadow:0 0 15px #00c3ff;
}

.profile{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:20px;
}

.profile img{
  width:55px;
  height:55px;
  border-radius:50%;
  border:2px solid #8a2be2;
}

.onlineText{
  color:#00ff99;
  font-size:13px;
  margin-top:3px;
}

button{
  background:linear-gradient(45deg,#00bfff,#8a2be2);
  border:none;
  color:white;
  padding:12px;
  border-radius:15px;
  cursor:pointer;
  margin-bottom:12px;
  font-weight:bold;
}

#searchInput{
  padding:12px;
  border:none;
  border-radius:12px;
  background:#18233a;
  color:white;
  margin-bottom:15px;
  outline:none;
}

.usersTitle{
  margin-bottom:10px;
  color:#00c3ff;
}

#usersList{
  overflow-y:auto;
  flex:1;
}

/* USER CARD */

.user{
  background:#121a2b;
  padding:12px;
  border-radius:15px;
  margin-bottom:10px;
  display:flex;
  align-items:center;
  gap:12px;
  cursor:pointer;
  position:relative;
}

.user img{
  width:50px;
  height:50px;
  border-radius:50%;
}

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

.userEmail{
  font-size:12px;
  opacity:0.7;
}

.status{
  font-size:12px;
  margin-top:4px;
  opacity:0.8;
}

/* UNREAD BADGE */

.unreadBadge{

  position:absolute;

  right:12px;

  top:50%;

  transform:translateY(-50%);

  min-width:22px;

  height:22px;

  background:#ff2b2b;

  border-radius:50%;

  display:none;

  justify-content:center;

  align-items:center;

  color:white;

  font-size:11px;

  font-weight:bold;

  padding:0 6px;

  z-index:5;

}

/* CHAT AREA */

.chatArea{
  flex:1;
  display:flex;
  flex-direction:column;
  min-height:0;
}

#chatHeader{
  padding:20px;
  background:#0d1320;
  border-bottom:1px solid #1f2a44;
  flex-shrink:0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.chatHeaderMain{
  min-width:0;
}

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

#voiceCallBtn,
#videoCallBtn,
#endCallBtn{
  margin-bottom:0;
  padding:10px 12px;
  font-size:13px;
}

#voiceCallBtn:disabled,
#videoCallBtn:disabled{
  opacity:0.6;
  cursor:not-allowed;
}

.dangerBtn{
  background:linear-gradient(45deg,#ff4d4d,#c61515);
}

#chatUserName{
  font-size:22px;
  color:#00c3ff;
}

#chatUserStatus{
  margin-top:5px;
  font-size:13px;
  opacity:0.8;
}

#chatMessages{
  flex:1;
  padding:20px;
  overflow-y:auto;
  overflow-x:hidden;
  min-height:0;
}

.videoPanel{
  display:none;
  position:relative;
  background:#060913;
  border-bottom:1px solid #1f2a44;
  height:220px;
}

.videoPanel.active{
  display:block;
}

#remoteVideo{
  width:100%;
  height:100%;
  object-fit:cover;
  background:#000;
}

#localVideo{
  position:absolute;
  right:12px;
  bottom:12px;
  width:120px;
  height:80px;
  object-fit:cover;
  border:2px solid #00c3ff;
  border-radius:8px;
  background:#000;
}

/* MESSAGE */

.message{
  max-width:340px;
  padding:14px;
  margin-bottom:15px;
  border-radius:18px;
  word-wrap:break-word;
  overflow:hidden;
  word-break:break-word;
}

.me{
  background:linear-gradient(45deg,#00bfff,#8a2be2);
  margin-left:auto;
}

.other{
  background:#18233a;
}

.sender{
  font-size:12px;
  opacity:0.7;
  margin-bottom:5px;
}

.time{
  font-size:11px;
  opacity:0.7;
  margin-top:8px;
  text-align:right;
}

.tick{
  margin-left:6px;
}

.message img{
  width:100%;
  border-radius:10px;
  margin-top:10px;
}

#typingIndicator{
  height:25px;
  padding-left:20px;
  font-size:13px;
  opacity:0.7;
}

/* MESSAGE BOX */

.messageBox{
  display:flex;
  gap:10px;
  padding:12px;
  background:#0d1320;
  border-top:1px solid #1f2a44;
  flex-shrink:0;
}

#messageInput{
  flex:1;
  padding:15px;
  border:none;
  border-radius:15px;
  background:#18233a;
  color:white;
  outline:none;
}

#imageBtn{
  width:60px;
}

#sendBtn{
  width:120px;
}

/* USERNAME PAGE */

.usernamePage{

  position:fixed;

  top:0;
  left:0;

  width:100%;
  height:100dvh;

  background:#070b14;

  z-index:9999;

  display:none;

  justify-content:center;
  align-items:center;

  padding:20px;

}

.usernamePage.active{
  display:flex;
}

.usernameCard{

  width:100%;
  max-width:400px;

  background:#121a2b;

  border:1px solid #1f2a44;

  border-radius:25px;

  padding:35px 25px;

  text-align:center;

}

.usernameCard h1{

  color:#00c3ff;

  margin-bottom:10px;

}

.usernameCard p{

  opacity:0.8;

  margin-bottom:25px;

}

#usernameInput{

  width:100%;

  padding:15px;

  border:none;

  border-radius:15px;

  background:#18233a;

  color:white;

  outline:none;

  margin-bottom:20px;

}

.profileUsername{

  font-size:14px;

  color:#9aa4b2;

  margin-top:2px;

}

.incomingCallModal{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,0.55);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:9998;
  padding:20px;
}

.incomingCallModal.active{
  display:flex;
}

.incomingCallCard{
  width:100%;
  max-width:380px;
  background:#121a2b;
  border:1px solid #1f2a44;
  border-radius:18px;
  padding:22px;
}

.incomingCallCard h2{
  color:#00c3ff;
  margin-bottom:8px;
}

.incomingCallCard p{
  opacity:0.9;
  margin-bottom:16px;
}

.incomingCallActions{
  display:flex;
  gap:10px;
}

.incomingCallActions button{
  margin-bottom:0;
  flex:1;
}

/* BACK BUTTON */

#backBtn{
  display:none;
}

/* MOBILE */

@media(max-width:768px){

  .app{
    height:100dvh;
    overflow:hidden;
  }

  .sidebar{
    width:100%;
    height:100dvh;
    border-right:none;
    padding:15px;
  }

  .sidebar.hide{
    display:none;
  }

  .chatArea{
    display:none;
    width:100%;
    height:100dvh;
    flex-direction:column;
  }

  .chatArea.active{
    display:flex;
  }

  #backBtn{
    display:block;
    width:50px;
    margin-bottom:10px;
  }

  .logo{
    font-size:24px;
    margin-bottom:18px;
  }

  .profile img{
    width:48px;
    height:48px;
  }

  button{
    padding:10px;
    font-size:14px;
  }

  #searchInput{
    padding:10px;
    font-size:14px;
  }

  .user{
    padding:10px;
  }

  .user img{
    width:45px;
    height:45px;
  }

  #chatHeader{
    padding:15px;
    gap:8px;
  }

  #chatUserName{
    font-size:20px;
  }

  #chatUserStatus{
    font-size:12px;
  }

  #chatMessages{
    flex:1;
    padding:12px;
    overflow-y:auto;
    overflow-x:hidden;
    min-height:0;
  }

  .message{
    max-width:85%;
    padding:12px;
    font-size:14px;
  }

  .sender{
    font-size:11px;
  }

  .time{
    font-size:10px;
  }

  .messageBox{
    padding:10px;
    gap:8px;
  }

  #messageInput{
    padding:12px;
    font-size:14px;
  }

  #sendBtn{
    width:90px;
    font-size:14px;
  }

  .callActions{
    flex-direction:column;
    align-items:flex-end;
  }

  #voiceCallBtn,
  #videoCallBtn,
  #endCallBtn{
    width:95px;
    padding:8px;
    font-size:12px;
  }

  .videoPanel{
    height:180px;
  }

  #localVideo{
    width:96px;
    height:68px;
    right:8px;
    bottom:8px;
  }

}