:root{
  --bg0:#05070d;
  --bg1:#070b16;
  --card: rgba(255,255,255,.06);
  --card2: rgba(255,255,255,.08);
  --stroke: rgba(255,255,255,.12);
  --text:#eaf0ff;
  --muted: rgba(234,240,255,.7);

  --cyan:#39e7ff;
  --violet:#a78bfa;
  --pink:#fb7185;
  --green:#34d399;

  --shadow: 0 18px 80px rgba(0,0,0,.55);
  --radius: 20px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 15% 20%, rgba(57,231,255,.12), transparent 60%),
    radial-gradient(900px 600px at 85% 25%, rgba(167,139,250,.13), transparent 55%),
    radial-gradient(900px 700px at 60% 85%, rgba(251,113,133,.10), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  overflow:hidden;
}

a{ color:var(--cyan); text-decoration:none; }
a:hover{ text-decoration:underline; }

/* ===== LAYOUT ===== */

.container{
  width:min(1100px, 92vw);
  margin:0 auto;
  padding:24px 0 24px;
}

/* ===== NAV ===== */

.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:14px 16px;
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  letter-spacing:.4px;
}

.brand .dot{
  width:10px;height:10px;border-radius:999px;
  background: radial-gradient(circle at 30% 30%, #fff, var(--cyan) 40%);
  box-shadow: 0 0 18px rgba(57,231,255,.65);
}

.nav .right{
  display:flex;
  gap:10px;
  align-items:center;
}

/* ===== BUTTONS ===== */

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border-radius:14px;
  border:1px solid var(--stroke);
  background: rgba(255,255,255,.06);
  color:var(--text);
  cursor:pointer;
  transition:.15s ease;
}

.btn:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.1);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.btn.primary{
  border-color: rgba(57,231,255,.35);
  background: linear-gradient(180deg, rgba(57,231,255,.22), rgba(167,139,250,.14));
  box-shadow: 0 0 0 1px rgba(57,231,255,.12) inset;
}

/* ===== CHAT PAGE ===== */

.chat-layout{
  display:flex;
  flex-direction:column;
  height: calc(100vh - 140px);
  max-width:1100px;
  margin:28px auto 0;
}

.chat-header{
  margin-bottom:16px;
}

.h1{
  font-size: clamp(22px, 2.5vw, 34px);
  margin:0 0 4px;
}

.p{
  margin:0;
  color:var(--muted);
}

/* ===== CHAT CONTAINER ===== */

.chat-box{
  display:flex;
  flex-direction:column;
  flex:1;
  border-radius:20px;
  border:1px solid rgba(120,150,255,.25);
  background: rgba(10,14,25,.92);
  box-shadow: var(--shadow);
  padding:20px;
}

/* ===== MESSAGES ===== */

.chat-messages{
  flex:1;
  overflow-y:auto;
  padding-bottom:16px;
}

/* ===== INPUT BAR (BOTTOM) ===== */

.chat-input-bar{
  border-top:1px solid rgba(120,150,255,.15);
  padding-top:16px;
}

.chat-input{
  width:100%;
  min-height:160px;
  resize:none;
  background: rgba(0,0,0,.45);
  border:1px solid rgba(120,150,255,.35);
  border-radius:14px;
  padding:16px;
  color:#e6ecff;
  font-size:16px;
}

.chat-input::placeholder{
  color:#8fa0ff;
}

.chat-actions{
  margin-top:12px;
  display:flex;
  justify-content:flex-end;
}

/* ===== GRID OVERLAY ===== */

.bg-grid{
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.18;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:54px 54px;
  mask-image: radial-gradient(900px 700px at 50% 30%, #000 55%, transparent 78%);
}