*{box-sizing:border-box;margin:0;padding:0;}
:root{--bg:#08101a;--bg2:#0d1926;--bg3:#111f30;--bg4:#162535;--border:rgba(255,255,255,0.07);--border2:rgba(255,255,255,0.12);--blue:#3b82f6;--blue2:#7dd3fc;--teal:#2dd4bf;--t1:#e2eaf4;--t2:#7d9ab8;--t3:#3d5a78;--red:#f87171;--sans:'Cabinet Grotesk',sans-serif;--serif:'Fraunces',Georgia,serif;}
body{font-family:var(--sans);background:var(--bg);color:var(--t1);height:100vh;display:flex;overflow:hidden;}

/* SIDEBAR */
.sidebar{width:240px;flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;}
.sidebar-top{padding:16px;border-bottom:1px solid var(--border);}
.sidebar-brand{font-family:var(--serif);font-size:1.1rem;font-weight:600;margin-bottom:12px;display:flex;align-items:center;gap:8px;}
.brand-gem{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,var(--blue),var(--teal));display:flex;align-items:center;justify-content:center;font-size:12px;}
.new-chat-btn{width:100%;padding:9px 12px;background:rgba(59,130,246,.1);border:1px dashed rgba(59,130,246,.35);border-radius:8px;color:var(--blue2);font-size:13px;font-family:var(--sans);font-weight:500;cursor:pointer;display:flex;align-items:center;gap:8px;transition:all .2s;}
.new-chat-btn:hover{background:rgba(59,130,246,.18);}

.sidebar-section{padding:12px 16px 5px;font-size:10px;font-weight:700;color:var(--t3);text-transform:uppercase;letter-spacing:.1em;display:flex;align-items:center;justify-content:space-between;}
.clear-all-btn{font-size:9px;font-weight:600;color:var(--t3);background:transparent;border:1px solid var(--t3);border-radius:4px;padding:2px 7px;cursor:pointer;font-family:var(--sans);transition:all .2s;text-transform:uppercase;letter-spacing:.06em;}
.clear-all-btn:hover{color:var(--red);border-color:var(--red);}

.history-list{flex:1;overflow-y:auto;padding:4px 8px;scrollbar-width:thin;}

/* HISTORY ITEM — tampilkan tombol hapus saat hover */
.history-item{
  padding:9px 10px;border-radius:8px;font-size:13px;color:var(--t2);
  cursor:pointer;transition:all .15s;
  display:flex;align-items:center;gap:8px;
  position:relative;
}
.history-item.active{background:rgba(59,130,246,.12);color:var(--t1);}
.history-item:hover:not(.active){background:rgba(255,255,255,.04);color:var(--t1);}
.hi-title{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.hi-icon{font-size:11px;flex-shrink:0;}
.hi-delete{
  flex-shrink:0;
  width:20px;height:20px;
  border-radius:4px;border:none;
  background:transparent;
  color:var(--t3);
  font-size:13px;line-height:1;
  cursor:pointer;
  display:none; /* sembunyikan by default */
  align-items:center;justify-content:center;
  transition:all .15s;
  padding:0;
}
.history-item:hover .hi-delete{display:flex;}
.hi-delete:hover{background:rgba(248,113,113,.15);color:var(--red);}

.sidebar-model{padding:12px 16px;border-top:1px solid var(--border);}
.model-select{width:100%;background:var(--bg3);border:1px solid var(--border2);border-radius:7px;padding:7px 10px;font-size:12px;color:var(--t1);font-family:var(--sans);outline:none;cursor:pointer;}
.model-select option{background:var(--bg2);}

/* MAIN */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;}
.topbar{background:var(--bg2);border-bottom:1px solid var(--border);height:54px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;}
.topbar-title{font-size:14px;font-weight:500;}
.topbar-actions{display:flex;gap:8px;align-items:center;}
.tier-label{background:rgba(45,212,191,.1);border:1px solid rgba(45,212,191,.25);color:var(--teal);font-size:10px;font-weight:700;padding:3px 12px;border-radius:99px;letter-spacing:.06em;text-transform:uppercase;}
.action-btn{padding:6px 12px;border-radius:7px;border:1px solid var(--border2);background:transparent;color:var(--t2);font-size:12px;font-family:var(--sans);cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:5px;}
.action-btn:hover{border-color:var(--blue);color:var(--blue2);}
.chat-area{flex:1;overflow-y:auto;padding:22px 0;scrollbar-width:thin;scrollbar-color:var(--bg3) transparent;}
.chat-inner{max-width:700px;width:100%;margin:0 auto;padding:0 22px;display:flex;flex-direction:column;gap:22px;}
.welcome{text-align:center;padding:36px 20px;animation:fadeIn .5s ease both;}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px);}to{opacity:1;transform:translateY(0);}}
.welcome h2{font-family:var(--serif);font-size:1.7rem;font-weight:600;margin-bottom:10px;}
.welcome h2 em{font-style:italic;color:var(--blue2);}
.welcome p{font-size:14px;color:var(--t2);line-height:1.75;max-width:400px;margin:0 auto 18px;}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;}
.chip{padding:7px 14px;border-radius:99px;font-size:12.5px;border:1px solid var(--border2);color:var(--t2);cursor:pointer;transition:all .2s;}
.chip:hover{border-color:var(--blue);color:var(--blue2);background:rgba(59,130,246,.08);}
.msg{display:flex;gap:12px;align-items:flex-start;animation:fadeIn .3s ease both;}
.msg-user{flex-direction:row-reverse;}
.av{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0;margin-top:2px;}
.av-ai{background:linear-gradient(135deg,var(--blue),var(--teal));color:#fff;}
.av-user{background:var(--bg4);border:1px solid var(--border2);color:var(--t2);}
.msg-content{flex:1;display:flex;flex-direction:column;align-items:flex-start;gap:5px;max-width:76%;}
.msg-user .msg-content{align-items:flex-end;}
.bubble{padding:12px 16px;border-radius:14px;font-size:14px;line-height:1.75;}
.bubble-ai{background:var(--bg2);border:1px solid var(--border);color:var(--t1);border-top-left-radius:3px;width:100%;}
.bubble-user{background:var(--blue);color:#fff;border-top-right-radius:3px;}
.bubble-ai strong{color:#fff;}.bubble-ai code{background:rgba(255,255,255,.07);border-radius:4px;padding:1px 6px;font-family:monospace;font-size:12.5px;}
.bubble-ai pre{background:rgba(0,0,0,.3);border:1px solid var(--border);border-radius:8px;padding:12px;margin:8px 0;overflow-x:auto;}.bubble-ai pre code{background:none;padding:0;}
.bubble-ai ul,.bubble-ai ol{padding-left:20px;margin:6px 0;display:flex;flex-direction:column;gap:4px;}.bubble-ai p{margin:3px 0;}
.img-attached{background:var(--bg3);border:1px solid var(--border);border-radius:10px;padding:9px 12px;font-size:12px;color:var(--t2);display:flex;align-items:center;gap:8px;}
.img-thumb{width:32px;height:32px;border-radius:6px;overflow:hidden;flex-shrink:0;}
.img-thumb img{width:100%;height:100%;object-fit:cover;}
.msg-actions{display:flex;gap:5px;opacity:0;transition:opacity .2s;}
.msg:hover .msg-actions{opacity:1;}
.mact{padding:3px 8px;border-radius:5px;font-size:11px;border:1px solid var(--border2);color:var(--t3);background:transparent;cursor:pointer;transition:all .15s;font-family:var(--sans);}
.mact:hover{border-color:var(--blue);color:var(--blue2);}
.typing-dots{display:flex;gap:5px;align-items:center;padding:4px 2px;}
.typing-dots span{width:7px;height:7px;border-radius:50%;background:var(--t3);animation:bounce 1.2s infinite;}
.typing-dots span:nth-child(2){animation-delay:.15s;}.typing-dots span:nth-child(3){animation-delay:.3s;}
@keyframes bounce{0%,60%,100%{transform:translateY(0);}30%{transform:translateY(-6px);}}
.cursor-blink{display:inline-block;width:2px;height:14px;background:var(--blue2);margin-left:2px;animation:blink .7s infinite;vertical-align:middle;}
@keyframes blink{0%,100%{opacity:1;}50%{opacity:0;}}
.input-bar{background:var(--bg2);border-top:1px solid var(--border);padding:12px 20px;flex-shrink:0;}
.input-inner{max-width:700px;margin:0 auto;}
.upload-preview{display:none;align-items:center;gap:10px;background:rgba(59,130,246,.07);border:1px solid rgba(59,130,246,.2);border-radius:8px;padding:8px 12px;margin-bottom:8px;font-size:12px;color:var(--blue2);}
.upload-preview.show{display:flex;}
.upload-preview img{width:36px;height:36px;border-radius:6px;object-fit:cover;}
.upload-preview button{margin-left:auto;background:transparent;border:none;color:var(--t3);cursor:pointer;font-size:15px;line-height:1;}
.toolbar{display:flex;gap:6px;margin-bottom:8px;}
.tbtn{padding:5px 11px;border-radius:6px;border:1px solid var(--border2);background:transparent;color:var(--t2);font-size:12px;font-family:var(--sans);cursor:pointer;display:flex;align-items:center;gap:5px;transition:all .2s;}
.tbtn:hover{border-color:var(--blue);color:var(--blue2);}
.input-wrap{display:flex;gap:10px;align-items:flex-end;background:var(--bg3);border:1px solid var(--border2);border-radius:12px;padding:10px 10px 10px 16px;transition:border-color .2s;}
.input-wrap:focus-within{border-color:var(--blue);}
.input-box{flex:1;background:transparent;border:none;outline:none;font-size:14px;color:var(--t1);font-family:var(--sans);resize:none;min-height:24px;max-height:120px;line-height:1.5;}
.input-box::placeholder{color:var(--t3);}
.send-btn{width:40px;height:40px;border-radius:10px;background:var(--blue);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;flex-shrink:0;transition:all .2s;box-shadow:0 0 18px rgba(59,130,246,.3);}
.send-btn:hover{background:#2563eb;}.send-btn:disabled{background:var(--t3);cursor:not-allowed;box-shadow:none;}
.input-hint{display:flex;justify-content:space-between;margin-top:7px;font-size:11px;color:var(--t3);}

/* CONFIRM DIALOG kustom */
.confirm-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:999;opacity:0;pointer-events:none;transition:opacity .2s;}
.confirm-overlay.show{opacity:1;pointer-events:all;}
.confirm-box{background:var(--bg2);border:1px solid var(--border2);border-radius:14px;padding:24px 28px;width:300px;box-shadow:0 20px 60px rgba(0,0,0,.5);}
.confirm-box p{font-size:14px;color:var(--t1);line-height:1.6;margin-bottom:20px;}
.confirm-box p strong{color:#fff;}
.confirm-btns{display:flex;gap:10px;justify-content:flex-end;}
.confirm-cancel{padding:8px 16px;border-radius:7px;border:1px solid var(--border2);background:transparent;color:var(--t2);font-size:13px;font-family:var(--sans);cursor:pointer;transition:all .2s;}
.confirm-cancel:hover{border-color:var(--border2);color:var(--t1);}
.confirm-ok{padding:8px 16px;border-radius:7px;border:none;background:rgba(248,113,113,.15);border:1px solid rgba(248,113,113,.3);color:var(--red);font-size:13px;font-family:var(--sans);cursor:pointer;font-weight:500;transition:all .2s;}
.confirm-ok:hover{background:rgba(248,113,113,.25);}

/* ========================================
   RESPONSIVE TABLET
======================================== */
@media (max-width: 992px){

  .sidebar{
    width:220px;
  }

  .chat-inner{
    max-width:100%;
    padding:0 18px;
  }

  .input-inner{
    max-width:100%;
  }

  .msg-content{
    max-width:85%;
  }

}

/* ========================================
   RESPONSIVE MOBILE
======================================== */
@media (max-width: 768px){

  body{
    position:relative;
  }

  /* SIDEBAR OFFCANVAS */
  .sidebar{
    position:fixed;
    left:-260px;
    top:0;
    width:260px;
    height:100vh;
    z-index:9999;
    transition:left .3s ease;
    box-shadow:0 0 40px rgba(0,0,0,.5);
  }

  .sidebar.show{
    left:0;
  }

  .main{
    width:100%;
  }

  .topbar{
    padding:0 12px;
  }

  .topbar-title{
    font-size:13px;
    max-width:130px;
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
  }

  .topbar-actions{
    gap:4px;
  }

  .action-btn{
    padding:6px 8px;
    font-size:11px;
  }

  .chat-inner{
    padding:0 12px;
  }

  .msg-content{
    max-width:92%;
  }

  .bubble{
    font-size:13px;
    padding:11px 13px;
  }

  .welcome{
    padding:20px 10px;
  }

  .welcome h2{
    font-size:1.35rem;
  }

  .welcome p{
    font-size:13px;
  }

  .chips{
    gap:6px;
  }

  .chip{
    font-size:11px;
    padding:6px 10px;
  }

  .input-bar{
    padding:10px;
  }

  .toolbar{
    flex-wrap:wrap;
  }

  .input-wrap{
    padding:8px 8px 8px 12px;
  }

  .input-box{
    font-size:14px;
  }

  .send-btn{
    width:38px;
    height:38px;
  }

}

/* ========================================
   EXTRA SMALL PHONE
======================================== */
@media (max-width: 480px){

  .topbar{
    height:50px;
  }

  .action-btn{
    padding:5px 7px;
    font-size:10px;
  }

  .bubble{
    font-size:12.5px;
    line-height:1.6;
  }

  .msg-content{
    max-width:95%;
  }

  .welcome h2{
    font-size:1.2rem;
  }

  .welcome p{
    font-size:12px;
  }

  .chip{
    width:100%;
    text-align:center;
  }

}