:root{
  --bg: #0a0a0a;          /* primary black */
  --card: #111213;        /* near-black card */
  --muted: #9aa0a6;       /* muted gray text */
  --text: #f2f3f5;        /* main text */
  --accent: #e5e7eb;      /* borders */
  --ok: #22c55e;          /* green status */
  --bad: #ef4444;         /* red status */
  --btn: #1f2937;         /* button bg */
  --btn-hover: #2b3442;   /* button hover */
  --bubble-user: #1f2937; /* user bubble */
  --bubble-assist: #0f172a;/* assistant bubble */
  --shadow: 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.app{
  max-width: 960px;
  margin: 0 auto;
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
  padding: 20px;
}

/* Header */
.app-header{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.app-title{
  margin: 0;
  font-size: 20px;
  letter-spacing: .3px;
}

.status{
  position: relative;
  padding-left: 24px;              /* space for the dot */
  color: var(--muted);
  font-size: 14px;
}
.status::before{
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: var(--bad);          /* default red */
  box-shadow: 0 0 0 4px rgba(239,68,68,.15);
}
.status.ok{ color: var(--text); }
.status.ok::before{
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(34,197,94,.15);
}
.status.bad::before{
  background: var(--bad);
  box-shadow: 0 0 0 4px rgba(239,68,68,.15);
}

/* Chat window */
.chat{
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 12px;
}

.chat-window{
  background: var(--card);
  border: 1px solid rgba(229,231,235,.08);
  border-radius: 16px;
  padding: 16px;
  overflow: auto;
  min-height: 340px;
  box-shadow: var(--shadow);
}

.bubble{
  max-width: 78%;
  padding: 12px 14px;
  border-radius: 14px;
  margin: 8px 0;
  white-space: pre-wrap;
  word-wrap: break-word;
  border: 1px solid rgba(229,231,235,.08);
}

.bubble.user{
  margin-left: auto;
  background: var(--bubble-user);
}

.bubble.assistant{
  margin-right: auto;
  background: var(--bubble-assist);
}

/* Composer */
.composer{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

.input{
  width: 100%;
  resize: vertical;
  background: #0b0b0c;
  color: var(--text);
  border: 1px solid rgba(229,231,235,.12);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none;
  box-shadow: inset 0 0 0 9999px rgba(255,255,255,0); /* prevent autofill shine */
}
.input::placeholder{ color: #6b7280; }
.input:focus{
  border-color: #2dd4bf;
  box-shadow: 0 0 0 3px rgba(45,212,191,.18);
}

.send{
  height: 42px;
  padding: 0 18px;
  border: 1px solid rgba(229,231,235,.12);
  border-radius: 12px;
  background: var(--btn);
  color: var(--text);
  cursor: pointer;
  transition: transform .02s ease, background .15s ease;
}
.send:hover{ background: var(--btn-hover); }
.send:active{ transform: translateY(1px); }

/* Footer */
.app-footer{
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid rgba(229,231,235,.08);
  padding-top: 12px;
}
.app-footer code{
  background: #0f0f11;
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid rgba(229,231,235,.08);
}