:root{
  --charcoal:#0f0f10;
  --graphite:#232323;
  --porcelain:#f5f5f5;
  --sugi:#d4af37; /* sufi gold */
  --sage:#a5c4a1;
  --muted:#c98686;
  --panel: rgba(255,255,255,0.03);
  --bubble: rgba(255,255,255,0.04);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, #0b0b0b 0%, #141414 100%);
  color:var(--porcelain);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}

/* container */
.container{ width:100%; max-width:900px; }

/* main card */
.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.02));
  border-radius:18px;
  padding:28px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.03);
}

/* header */
.card-header{ display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:18px; gap:12px; }
.title{ font-size:32px; margin:0; letter-spacing: -0.02em; color: #ead9b1; } /* soft gold-ish */
.subtitle{ margin:6px 0 0 0; color: rgba(245,245,245,0.65); font-size:14px; }

/* chat area */
.chat-area{
  height:420px;
  background: var(--panel);
  border-radius:12px;
  padding:18px;
  margin-bottom:16px;
  overflow:auto;
  display:flex;
  flex-direction:column;
  gap:12px;
  border:1px solid rgba(255,255,255,0.03);
}

/* messages */
.message{
  max-width:78%;
  padding:14px 16px;
  border-radius:12px;
  line-height:1.35;
  font-size:15px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.45);
  background:var(--bubble);
}
.assistant{
  align-self:flex-start;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
  color:var(--porcelain);
}
.user{
  align-self:flex-end;
  background: rgba(165,196,161,0.09);
  color: var(--porcelain);
}

/* composer */
.composer{
  display:flex;
  gap:12px;
  align-items:center;
}
.input{
  flex:1;
  padding:14px 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.02));
  border:1px solid rgba(255,255,255,0.03);
  border-radius:12px;
  color:var(--porcelain);
  font-size:15px;
  outline:none;
}
.input::placeholder{ color: rgba(245,245,245,0.35); }
.send-btn{
  border:0;
  padding:12px 18px;
  border-radius:10px;
  background:var(--sugi);
  color:#111;
  font-weight:700;
  cursor:pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,0.45);
  transition: transform .12s ease, box-shadow .12s ease;
}
.send-btn:active{ transform: translateY(1px); }
.send-btn:focus{ outline:2px solid rgba(212,175,55,0.18); }

/* footer */
.card-footer{ text-align:center; margin-top:14px; font-size:13px; color:rgba(245,245,245,0.45); }

/* responsive */
@media (max-width:600px){
  .title{ font-size:22px; }
  .chat-area{ height:360px; }
}