:root {
  --bg: #0a0c0f;
  --bg-raised: #12151a;
  --border: #21262e;
  --text: #e8eaed;
  --text-dim: #8b939e;
  --text-faint: #5b6470;
  --accent: #3ddad7;
  --accent-dim: #1f7c7a;
  --danger: #e5836a;
  --radius: 10px;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.shell { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; }
.brand-mark { color: var(--accent); font-size: 14px; }

.badge {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-faint);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
}
.badge.ok { color: var(--accent); border-color: var(--accent-dim); }
.badge.bad { color: var(--danger); border-color: var(--danger); }

.main { flex: 1; width: 100%; max-width: 720px; margin: 0 auto; padding: 64px 24px 48px; }

.intro h1 { font-size: 32px; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 10px; }
.intro p { color: var(--text-dim); font-size: 15px; margin: 0 0 36px; line-height: 1.5; }

.ask-form { display: flex; gap: 10px; }

#question {
  flex: 1;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.15s ease;
}
#question:focus { border-color: var(--accent-dim); }
#question::placeholder { color: var(--text-faint); }
#question:disabled { opacity: 0.5; }

#ask-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #06201f;
  border: none;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  padding: 0 22px;
  cursor: pointer;
  transition: opacity 0.15s ease;
}
#ask-btn:hover { opacity: 0.9; }
#ask-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(6, 32, 31, 0.35);
  border-top-color: #06201f;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.examples { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

.chip {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
  padding: 7px 14px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.chip:hover { border-color: var(--accent-dim); color: var(--text); }
.chip:disabled { opacity: 0.5; cursor: not-allowed; }

.result { margin-top: 40px; }

.sources-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.sources-list { display: flex; flex-direction: column; gap: 10px; }

.source-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: var(--bg-raised);
}

.source-item img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.source-meta { display: flex; gap: 8px; align-items: center; margin-bottom: 4px; }
.source-page { font-family: var(--mono); font-size: 11px; color: var(--accent); }
.source-modality {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-faint);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  text-transform: uppercase;
}
.source-score { font-family: var(--mono); font-size: 10px; color: var(--text-faint); margin-left: auto; }
.source-snippet { font-size: 13px; color: var(--text-dim); line-height: 1.5; margin: 0; white-space: pre-wrap; }

.error { margin-top: 24px; color: var(--danger); font-size: 14px; }

.footer { text-align: center; padding: 20px; font-size: 12px; color: var(--text-faint); border-top: 1px solid var(--border); }

@media (max-width: 520px) {
  .ask-form { flex-direction: column; }
  #ask-btn { padding: 12px; }
}