:root {
  --bg: #080a0f;
  --panel: #10131a;
  --panel-2: #151923;
  --border: #252a35;
  --text: #f4f5f7;
  --muted: #8f96a3;
  --accent: #9ee493;
  --accent-2: #72d6c9;
  --danger: #ff8b8b;
  --shadow: 0 18px 50px rgba(0,0,0,.25);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 80% -10%, rgba(114,214,201,.09), transparent 35%),
    radial-gradient(circle at 10% 0%, rgba(158,228,147,.06), transparent 30%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

button, textarea, select { font: inherit; }

.app-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0 28px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 34px;
}

.eyebrow, .section-label, .stat-label, .answer-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .13em;
  color: var(--muted);
}

h1 {
  font-size: clamp(32px, 5vw, 54px);
  letter-spacing: -.045em;
  margin: 8px 0 7px;
  line-height: 1;
}

h2 {
  margin: 6px 0 0;
  font-size: 20px;
  letter-spacing: -.02em;
}

.subtitle {
  color: var(--muted);
  margin: 0;
  font-size: 15px;
}

.status-pill {
  border: 1px solid var(--border);
  background: rgba(16,19,26,.8);
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 12px;
  color: #c9ced7;
  white-space: nowrap;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 7px;
  box-shadow: 0 0 12px rgba(158,228,147,.65);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 18px;
}

.card {
  background: linear-gradient(145deg, rgba(20,24,33,.97), rgba(13,16,22,.97));
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.query-card, .architecture-card, .result-card, .info-card {
  padding: 25px;
}

label {
  display: block;
  color: #c8ccd4;
  font-size: 13px;
  margin: 22px 0 8px;
}

select, textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: #0b0e14;
  color: var(--text);
  border-radius: 11px;
  padding: 13px 14px;
  outline: none;
}

select:focus, textarea:focus {
  border-color: #4b8c82;
  box-shadow: 0 0 0 3px rgba(114,214,201,.08);
}

textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.55;
}

.primary-btn {
  width: 100%;
  margin-top: 16px;
  border: 0;
  border-radius: 11px;
  padding: 13px 16px;
  background: var(--accent);
  color: #071008;
  font-weight: 850;
  cursor: pointer;
}

.primary-btn:hover { filter: brightness(1.04); }
.primary-btn:disabled { opacity: .6; cursor: wait; }

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(7,16,8,.25);
  border-top-color: #071008;
  border-radius: 50%;
  animation: spin .8s linear infinite;
  vertical-align: -2px;
}

.hidden { display: none !important; }

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

.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 13px;
}

.examples button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 7px 9px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 11px;
}

.examples button:hover {
  color: var(--text);
  border-color: #3a414e;
}

.path-diagram {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
}

.node {
  width: 82%;
  text-align: center;
  padding: 10px 8px;
  border: 1px solid var(--border);
  background: #0b0e14;
  border-radius: 9px;
  color: #b8bec8;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .06em;
}

.node.active {
  border-color: rgba(158,228,147,.45);
  color: var(--accent);
}

.node.small { width: auto; display: inline-block; min-width: 125px; }

.arrow { color: #555c69; font-size: 14px; }

.branch {
  width: 100%;
  display: flex;
  justify-content: space-around;
  gap: 10px;
  margin-top: 2px;
}

.branch > div {
  display: flex;
  align-items: center;
  gap: 7px;
}

.branch-label { font-size: 10px; font-weight: 900; }
.branch-label.hit { color: var(--accent); }
.branch-label.miss { color: var(--danger); }

.result-card { margin-top: 18px; }

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.path-badge {
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .06em;
  border: 1px solid var(--border);
}

.path-badge.exact { color: var(--accent); border-color: rgba(158,228,147,.3); }
.path-badge.semantic { color: var(--accent-2); border-color: rgba(114,214,201,.3); }
.path-badge.miss { color: var(--danger); border-color: rgba(255,139,139,.3); }

.answer-box {
  margin-top: 20px;
  background: #0b0e14;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 17px;
}

.answer-label { margin-bottom: 9px; }

.answer {
  white-space: pre-wrap;
  color: #dfe2e8;
  line-height: 1.65;
  font-size: 14px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.metric {
  background: #0b0e14;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px;
}

.metric-label { color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.metric-value { margin-top: 6px; font-size: 15px; font-weight: 800; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.stat-card { padding: 19px; }
.stat-value { font-size: 27px; font-weight: 850; margin-top: 8px; letter-spacing: -.04em; }
.stat-note { color: var(--muted); font-size: 11px; margin-top: 4px; line-height: 1.4; }

.info-card {
  margin-top: 18px;
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 25px;
  align-items: start;
}

.tiers { display: grid; gap: 10px; }

.tier {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 11px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: #0b0e14;
}

.tier-number { color: var(--accent); font-weight: 900; font-size: 11px; }
.tier strong { font-size: 13px; }
.tier p { color: var(--muted); font-size: 11px; margin: 4px 0 0; line-height: 1.4; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  color: #666d79;
  font-size: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

@media (max-width: 850px) {
  .hero-grid, .info-card { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .app-shell { width: min(100% - 22px, 1180px); padding-top: 25px; }
  .topbar { flex-direction: column; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: 1fr; }
  .branch { flex-direction: column; align-items: center; }
}