:root {
  --bg: #0b0d12;
  --bg-soft: #12151d;
  --panel: #161a24;
  --panel-2: #1c212e;
  --border: #262c3a;
  --text: #e7eaf0;
  --muted: #9aa3b5;
  --accent: #6ea8fe;
  --accent-2: #8b7bff;
  --ok: #43d39e;
  --warn: #f4c152;
  --danger: #ff6b6b;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fb;
    --bg-soft: #eef1f7;
    --panel: #ffffff;
    --panel-2: #f3f5fa;
    --border: #e2e7f0;
    --text: #1a1f2b;
    --muted: #5d6577;
    --shadow: 0 6px 24px rgba(20, 30, 60, 0.08);
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(110, 168, 254, 0.12), transparent 60%), var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #06101f;
  padding: 10px 14px;
  border-radius: 8px;
  z-index: 50;
}
.skip-link:focus { left: 12px; top: 12px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 30px;
  line-height: 1;
  color: var(--accent);
  filter: drop-shadow(0 0 10px rgba(110, 168, 254, 0.5));
}
.brand h1 { font-size: 1.15rem; margin: 0; letter-spacing: 0.2px; }
.tagline { margin: 0; color: var(--muted); font-size: 0.82rem; }

.status { display: flex; align-items: center; gap: 10px; }
.status-text { display: flex; flex-direction: column; line-height: 1.25; }
.status-line { font-weight: 600; font-size: 0.9rem; }
.status-sub { color: var(--muted); font-size: 0.78rem; }
.status-sub strong { color: var(--text); }

.dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--muted) 20%, transparent);
  flex: none;
}
.dot.loading { background: var(--warn); animation: pulse 1.2s infinite ease-in-out; box-shadow: 0 0 0 4px color-mix(in srgb, var(--warn) 22%, transparent); }
.dot.ok { background: var(--ok); box-shadow: 0 0 0 4px color-mix(in srgb, var(--ok) 22%, transparent); }
.dot.warn { background: var(--warn); box-shadow: 0 0 0 4px color-mix(in srgb, var(--warn) 22%, transparent); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 22px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px clamp(16px, 4vw, 40px) 40px;
}
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .side { order: -1; }
}

/* ---------- chat ---------- */
.chat-pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 68vh;
  overflow: hidden;
}

.load { padding: 14px 18px 0; }
.load-track { height: 8px; background: var(--panel-2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.load-bar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width 0.3s ease; }
.load-label { color: var(--muted); font-size: 0.8rem; margin: 8px 2px 0; }

.log {
  flex: 1;
  overflow-y: auto;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.msg { max-width: 86%; padding: 13px 16px; border-radius: 14px; font-size: 0.95rem; }
.msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06101f;
  border-bottom-right-radius: 4px;
  font-weight: 500;
}
.msg.bot {
  align-self: flex-start;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.msg.bot.intro { max-width: 100%; }
.answer { white-space: pre-wrap; }
.cursor { animation: blink 1s steps(2) infinite; color: var(--accent); }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.cite {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  font-size: 0.78rem;
}
.cite-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.66rem;
  color: var(--accent);
  font-weight: 700;
  margin-right: 2px;
}
.cite code, .answer code, .bullets code, .kv code {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 7px;
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
  font-size: 0.78em;
}
.meta { margin-top: 8px; color: var(--muted); font-size: 0.74rem; font-variant-numeric: tabular-nums; }

/* ---------- examples ---------- */
.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 18px;
  border-top: 1px solid var(--border);
}
.examples button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 13px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.05s;
}
.examples button:hover { border-color: var(--accent); }
.examples button:active { transform: translateY(1px); }

/* ---------- composer ---------- */
.composer {
  display: flex;
  gap: 10px;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--border);
}
.composer textarea {
  flex: 1;
  resize: none;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font: inherit;
  font-size: 0.95rem;
  max-height: 140px;
}
.composer textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.composer button {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06101f;
  border: none;
  border-radius: 12px;
  padding: 0 22px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.05s;
}
.composer button:hover { opacity: 0.92; }
.composer button:active { transform: translateY(1px); }
.composer button:disabled { opacity: 0.5; cursor: progress; }

/* ---------- sidebar ---------- */
.side { display: flex; flex-direction: column; gap: 16px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.card h2 { margin: 0 0 12px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 14px; margin: 0; font-size: 0.85rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; text-align: right; font-weight: 500; }

.note { color: var(--muted); font-size: 0.76rem; margin: 12px 0 0; }

.metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.metric {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}
.metric-label { display: block; color: var(--muted); font-size: 0.72rem; margin-bottom: 6px; }
.metric-value {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.bullets { margin: 0; padding-left: 18px; font-size: 0.83rem; color: var(--muted); display: grid; gap: 7px; }
.bullets li { line-height: 1.4; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}