:root {
  --bg: #0b0f17;
  --panel: #101827;
  --panel2: #0f172a;
  --text: #e6edf7;
  --muted: #a7b3c6;
  --border: rgba(255,255,255,.10);
  --shadow: rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 20% 10%, rgba(80,120,255,.18), transparent 60%),
              radial-gradient(900px 500px at 90% 30%, rgba(80,255,200,.12), transparent 55%),
              var(--bg);
  color: var(--text);
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
  margin-bottom: 16px;
}

h1 { font-size: 20px; margin: 0 0 6px; }
p { margin: 0; color: var(--muted); }

.chat {
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 18px 40px var(--shadow);
  overflow: hidden;
}

.messages {
  padding: 16px;
  min-height: 52vh;
  max-height: 62vh;
  overflow: auto;
  background: rgba(0,0,0,.10);
}

.msg {
  display: flex;
  gap: 10px;
  margin: 10px 0;
}

.bubble {
  max-width: 78%;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  line-height: 1.35;
  white-space: pre-wrap;
}

.bot .bubble { background: var(--panel); }

.user { justify-content: flex-end; }
.user .bubble { background: var(--panel2); }

.composer {
  padding: 14px 16px 16px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.06);
}

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.optionBtn, button, input {
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  color: var(--text);
}

.optionBtn {
  padding: 9px 10px;
  cursor: pointer;
  font-size: 14px;
}
.optionBtn:hover { background: rgba(255,255,255,.10); }

.inputRow {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input {
  padding: 10px 12px;
  outline: none;
}

button {
  padding: 10px 12px;
  cursor: pointer;
}
button:hover { background: rgba(255,255,255,.10); }

.ghost { background: transparent; }

.hint {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

/* disabled / loading UX */
button:disabled, input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}