*{ margin:0; padding:0; box-sizing:border-box; font-family:Segoe UI; }
body{
  background:#050816;
  color:white;
  display:flex;
  overflow:hidden;
}

/* BG */
.bg{
  position:fixed; inset:0;
  background:
    radial-gradient(circle at top left, rgba(34,197,94,0.12), transparent 30%),
    radial-gradient(circle at bottom right, rgba(59,130,246,0.08), transparent 30%);
  z-index:-2;
  pointer-events:none;
}

/* MOBILE TOGGLE */
.mobile-toggle{
  display:none;
  position:fixed;
  top:16px;
  left:16px;
  z-index:100;
  width:44px;
  height:44px;
  border:none;
  border-radius:14px;
  background:rgba(255,255,255,0.06);
  color:white;
  font-size:20px;
  cursor:pointer;
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,0.06);
  transition:0.2s;
}
.mobile-toggle:hover{
  background:rgba(34,197,94,0.15);
}
.sidebar.open{
  display:flex !important;
}
.sidebar-overlay{
  display:none;
}

/* SIDEBAR */
.sidebar{
  width:260px;
  height:100vh;
  background:rgba(255,255,255,0.04);
  border-right:1px solid rgba(255,255,255,0.05);
  backdrop-filter:blur(18px);
  padding:25px;
  display:flex;
  flex-direction:column;
  position:relative;
  z-index:2;
  transition:transform 0.3s ease;
}

.logo{
  font-size:32px;
  font-weight:bold;
  color:#22c55e;
  margin-bottom:30px;
}

.sidebar-btn{
  padding:16px;
  border:none;
  border-radius:18px;
  background:rgba(255,255,255,0.05);
  color:white;
  margin-bottom:14px;
  cursor:pointer;
  transition:0.25s;
  font-size:14px;
  text-align:left;
}
.sidebar-btn:hover{
  background:rgba(34,197,94,0.16);
  transform:translateY(-2px);
}

.sidebar-bottom{
  margin-top:auto;
}

/* CHAT LIST */
#chatList{
  flex:1;
  overflow-y:auto;
  margin-top:10px;
}

.chat-item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px;
  margin-bottom:12px;
  border-radius:18px;
  background:rgba(255,255,255,0.04);
  border:1px solid transparent;
  transition:0.2s;
}
.chat-item:hover{
  background:rgba(255,255,255,0.07);
}

.chat-item.active{
  border-color:rgba(34,197,94,0.35);
  background:rgba(34,197,94,0.12);
}

.chat-title{
  cursor:pointer;
  flex:1;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.delete-chat-btn{
  border:none;
  background:none;
  color:rgba(255,255,255,0.5);
  cursor:pointer;
  font-size:16px;
  padding:4px 8px;
  border-radius:8px;
  transition:0.2s;
}
.delete-chat-btn:hover{
  color:#ef4444;
  background:rgba(239,68,68,0.1);
}

/* MAIN */
.main{
  flex:1;
  display:flex;
  flex-direction:column;
  height:100vh;
  position:relative;
  z-index:2;
}

/* CHAT */
.chat{
  flex:1;
  overflow-y:auto;
  padding:30px;
  display:flex;
  flex-direction:column;
  gap:20px;
}

/* Welcome screen */
.welcome-screen{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
  gap:20px;
  padding:40px;
}
.welcome-orb{
  width:100px;
  height:100px;
  border-radius:50%;
  background:radial-gradient(circle at 40% 35%, #4ade80, #14532d);
  box-shadow:0 0 60px rgba(34,197,94,0.2), 0 0 120px rgba(34,197,94,0.08);
  animation:idleFloat 4s ease-in-out infinite;
}
.welcome-screen h2{
  font-size:28px;
  color:rgba(255,255,255,0.9);
}
.welcome-screen p{
  color:rgba(255,255,255,0.45);
  font-size:16px;
  max-width:400px;
  line-height:1.7;
}

@keyframes idleFloat{
  0%{ transform:translateY(0px); }
  50%{ transform:translateY(-8px); }
  100%{ transform:translateY(0px); }
}

/* MESSAGES */
.message{
  display:flex;
  gap:14px;
  align-items:flex-end;
  animation:messageSlide 0.3s ease;
}

@keyframes messageSlide{
  from{ opacity:0; transform:translateY(12px); }
  to{ opacity:1; transform:translateY(0); }
}

.message.user{
  justify-content:flex-end;
}

.avatar{
  width:42px;
  height:42px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(255,255,255,0.08);
  flex-shrink:0;
  font-size:16px;
}

.bubble{
  max-width:70%;
  padding:16px 18px;
  border-radius:24px;
  background:rgba(255,255,255,0.06);
  line-height:1.7;
  border:1px solid rgba(255,255,255,0.04);
  word-wrap:break-word;
  font-size:15px;
  box-shadow:0 2px 12px rgba(0,0,0,0.1);
}

.message.user .bubble{
  background:rgba(34,197,94,0.1);
  border-color:rgba(34,197,94,0.15);
}

/* TYPING INDICATOR */
.typing-dots{
  display:flex; gap:4px; padding:16px 18px; align-items:center;
  max-width:70%;
}
.typing-dots span{
  width:8px; height:8px; border-radius:50%;
  background:rgba(34,197,94,0.5);
  animation:dotBounce 1.2s infinite;
}
.typing-dots span:nth-child(2){ animation-delay:0.2s; }
.typing-dots span:nth-child(3){ animation-delay:0.4s; }
@keyframes dotBounce{
  0%,100%{ transform:translateY(0); opacity:0.4; }
  50%{ transform:translateY(-6px); opacity:1; }
}

/* INPUT */
.input-area{
  width:100%;
  display:flex;
  gap:14px;
  padding:22px;
  border-top:1px solid rgba(255,255,255,0.05);
  background:rgba(255,255,255,0.03);
  backdrop-filter:blur(18px);
}

.input-area input{
  flex:1;
  border:none;
  outline:none;
  border-radius:18px;
  background:rgba(255,255,255,0.05);
  padding:18px;
  color:white;
  font-size:15px;
  transition:0.2s;
}
.input-area input:focus{
  background:rgba(255,255,255,0.08);
}
.input-area input::placeholder{
  color:rgba(255,255,255,0.35);
}

.action-btn,
.send-btn{
  width:56px;
  height:56px;
  border:none;
  border-radius:18px;
  cursor:pointer;
  font-size:18px;
  transition:0.25s;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}

.action-btn{
  background:rgba(255,255,255,0.05);
  color:white;
}

.send-btn{
  background:#22c55e;
  color:black;
  font-weight:bold;
  font-size:20px;
}

.action-btn:hover{
  transform:translateY(-3px);
  background:rgba(34,197,94,0.12);
}
.send-btn:hover{
  transform:translateY(-3px) scale(1.04);
  box-shadow:0 6px 24px rgba(34,197,94,0.35);
}
.send-btn:active{
  transform:scale(0.95);
}

/* IMAGE VIEWER */
#imageViewer{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,0.92);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:9999;
  cursor:zoom-out;
  backdrop-filter:blur(8px);
}

#viewerImage{
  max-width:90%;
  max-height:90%;
  border-radius:24px;
  animation:viewerFade 0.3s ease;
}

@keyframes viewerFade{
  from{ opacity:0; transform:scale(0.9); }
  to{ opacity:1; transform:scale(1); }
}

/* LOADING SPINNER */
.loading-spinner{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:40px;
}
.spinner{
  width:32px;
  height:32px;
  border:3px solid rgba(34,197,94,0.1);
  border-top-color:#22c55e;
  border-radius:50%;
  animation:spin 0.8s linear infinite;
}
@keyframes spin{
  to{ transform:rotate(360deg); }
}

/* CHAT IMAGE */
.chat-img-wrap{
  position:relative;
  display:inline-block;
  max-width:280px;
}
.chat-image{
  max-width:280px;
  border-radius:14px;
  cursor:pointer;
  border:1px solid rgba(255,255,255,0.06);
  transition:0.2s;
  display:block;
}
.chat-image:hover{
  opacity:0.9;
}
.chat-dl-btn{
  position:absolute;
  top:8px;
  right:8px;
  width:36px;
  height:36px;
  border:none;
  border-radius:10px;
  background:rgba(0,0,0,0.6);
  color:white;
  font-size:16px;
  cursor:pointer;
  opacity:0;
  transition:0.2s;
  display:flex;
  align-items:center;
  justify-content:center;
  backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,0.1);
}
.chat-img-wrap:hover .chat-dl-btn{
  opacity:1;
}
.chat-dl-btn:hover{
  background:rgba(34,197,94,0.4);
  transform:scale(1.1);
}

/* RESPONSIVE */
@media(max-width:900px){
  .sidebar{
    display:none;
    position:fixed;
    left:0;
    top:0;
    height:100vh;
    z-index:50;
    width:280px;
    background:rgba(5,8,22,0.98);
    backdrop-filter:blur(20px);
  }
  .mobile-toggle{
    display:flex;
    align-items:center;
    justify-content:center;
  }
  .bubble{
    max-width:90%;
  }
  .chat{
    padding:20px;
    padding-top:60px;
  }
  .input-area{
    padding:14px;
  }
  .sidebar-overlay{
    display:none;
    position:fixed;
    inset:0;
    background:rgba(0,0,0,0.6);
    z-index:49;
    backdrop-filter:blur(4px);
  }
  .sidebar-overlay.open{
    display:block;
  }
}

/* PARTICLES */
#particleCanvas{
  position:fixed;
  inset:0;
  width:100vw;
  height:100vh;
  z-index:0;
  pointer-events:none;
}

/* =========================
   GLOBAL THEMES
========================= */
body.dark{ background:#020617; }
body.emerald{ background:#021b12; }
body.emerald .logo{ color:#22c55e; }
body.emerald .send-btn,
body.emerald .main-btn,
body.emerald .launch-btn{
  background:#22c55e;
}
body.blue{ background:#07111f; }
body.blue .logo{ color:#3b82f6; }
body.blue .send-btn,
body.blue .main-btn,
body.blue .launch-btn{
  background:#3b82f6;
  color:white;
}
body.purple{ background:#13071f; }
body.purple .logo{ color:#a855f7; }
body.purple .send-btn,
body.purple .main-btn,
body.purple .launch-btn{
  background:#a855f7;
  color:white;
}
body.red{ background:#1f0707; }
body.red .logo{ color:#ef4444; }
body.red .send-btn,
body.red .main-btn,
body.red .launch-btn{
  background:#ef4444;
  color:white;
}