:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e5e7eb;
  background: #07111f;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(37, 99, 235, .16), transparent 28rem),
    radial-gradient(circle at 95% 20%, rgba(14, 165, 233, .08), transparent 24rem),
    #07111f;
}

button, textarea { font: inherit; }

button { cursor: pointer; }

.shell {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 40px;
}

.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.eyebrow, .section-label {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: #7dd3fc;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.2;
}

.subtitle {
  max-width: 720px;
  margin: 14px 0 0;
  color: #94a3b8;
  line-height: 1.9;
}

.status-dot {
  width: 12px;
  height: 12px;
  margin-top: 10px;
  border-radius: 999px;
  background: #22c55e;
  box-shadow: 0 0 0 7px rgba(34, 197, 94, .12);
}

.card {
  border: 1px solid rgba(148, 163, 184, .16);
  background: rgba(15, 23, 42, .82);
  box-shadow: 0 20px 50px rgba(0, 0, 0, .18);
  backdrop-filter: blur(10px);
  border-radius: 20px;
}

.ask-card { padding: 22px; }

label {
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 120px;
  border: 1px solid #26364c;
  border-radius: 14px;
  padding: 16px;
  color: #f8fafc;
  background: #081220;
  outline: none;
  line-height: 1.8;
}

textarea:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, .12);
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

button {
  border-radius: 12px;
  border: 1px solid transparent;
  padding: 10px 16px;
}

.primary {
  color: #04111f;
  background: #7dd3fc;
  font-weight: 800;
}

.primary:disabled { opacity: .5; cursor: not-allowed; }

.ghost, .icon-button, .feedback button {
  color: #dbeafe;
  background: #111c2e;
  border-color: #26364c;
}

.loading, .error {
  margin-top: 18px;
  padding: 18px 20px;
}

.loading {
  display: flex;
  align-items: center;
  gap: 12px;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(125, 211, 252, .25);
  border-top-color: #7dd3fc;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error {
  color: #fecaca;
  border-color: rgba(248, 113, 113, .35);
}

#answer-section { margin-top: 18px; }

.answer-card, .sources-card { padding: 22px; }

.sources-card { margin-top: 14px; }

.answer-head, .sources-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge, .count {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #111c2e;
  border: 1px solid #26364c;
  color: #bfdbfe;
  font-size: 12px;
}

.answer-text {
  margin-top: 20px;
  white-space: pre-wrap;
  line-height: 2;
  color: #f1f5f9;
}

.feedback {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, .12);
}

.feedback button { padding: 7px 11px; }

.sources {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.source {
  padding: 14px;
  border: 1px solid rgba(148, 163, 184, .13);
  border-radius: 14px;
  background: #0a1524;
}

.source-title {
  margin: 0 0 8px;
  color: #e0f2fe;
  font-weight: 750;
}

.source-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  color: #94a3b8;
  font-size: 12px;
}

.muted { color: #7f8ea3; font-size: 13px; }

.hidden { display: none !important; }

footer {
  padding: 26px 4px 0;
  color: #64748b;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 900px);
    padding-top: 28px;
  }

  .hero { gap: 12px; }
  .card { border-radius: 16px; }
  .ask-card, .answer-card, .sources-card { padding: 16px; }

  .answer-head, .sources-head {
    flex-direction: column;
  }

  .icon-button { width: 100%; }
}