:root {
  --bg: #eef2f7;
  --surface: #ffffff;
  --surface-alt: #f7fafc;
  --line: #d8e0ea;
  --line-strong: #b7c4d4;
  --text: #102236;
  --muted: #516275;
  --brand: #0b5cab;
  --brand-strong: #084a8b;
  --brand-soft: #d9ecff;
  --ok-bg: #dcfce7;
  --ok-text: #166534;
  --warn-bg: #fff4dd;
  --warn-text: #92400e;
  --danger-bg: #fff1f2;
  --danger-text: #991b1b;
  --chip-bg: #e8eff8;
  --chip-text: #1f3957;
  --author: #ef9d27;
  --paper: #2f7dd3;
  --topic: #16a073;
  --query: #6d28d9;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 20% 10%, #dbeafe 0, transparent 35%),
    radial-gradient(circle at 90% 0%, #e0f2fe 0, transparent 33%),
    var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  line-height: 1.45;
}

a {
  color: var(--brand-strong);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a,
input,
select,
textarea {
  outline: none;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  box-shadow: 0 0 0 2px #ffffff, 0 0 0 4px var(--brand);
  border-radius: 10px;
}

.app-shell {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px;
}

.top-nav {
  display: grid;
  grid-template-columns: 1.2fr auto auto auto;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--surface) 0%, #fbfdff 100%);
  margin-bottom: 14px;
}

.brand-block h1 {
  margin: 0;
  font-size: 1.55rem;
}

.kicker {
  margin: 0 0 3px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.top-nav-links {
  display: flex;
  gap: 8px;
}

.top-nav-links a {
  text-decoration: none;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.88rem;
}

.top-nav-links a:hover {
  border-color: var(--line);
  color: var(--text);
}

.mode-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 700;
}

.demo-badge {
  color: #0c4a6e;
  background: #e0f2fe;
}

.badge-outline {
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
}

.status-ok {
  color: var(--ok-text);
  background: var(--ok-bg);
}

.status-warn {
  color: var(--warn-text);
  background: var(--warn-bg);
}

.session-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
}

.layout-grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 14px;
}

.left-panel,
.main-panel {
  min-width: 0;
}

.left-panel {
  display: grid;
  gap: 12px;
  align-content: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.query-form {
  display: grid;
  gap: 10px;
}

.query-form.one-col {
  grid-template-columns: 1fr;
}

.left-panel label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-top: 9px;
}

input[type="text"],
select {
  width: 100%;
  margin-top: 4px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
  padding: 9px 10px;
}

.hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.primary-button,
.button-link,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 0.87rem;
  line-height: 1;
  padding: 9px 12px;
}

.primary-button {
  margin-top: 10px;
  color: #fff;
  background: var(--brand);
}

.primary-button:hover {
  background: var(--brand-strong);
}

.button-link {
  color: #083568;
  background: #e6f3ff;
  border-color: #b6dbff;
}

.ghost-button {
  color: var(--text);
  background: #fff;
  border-color: var(--line-strong);
}

.ghost-button:hover {
  background: var(--surface-alt);
}

.chips {
  display: grid;
  gap: 8px;
}

.chip {
  border: 1px solid #cad9eb;
  border-radius: 999px;
  text-align: left;
  background: var(--chip-bg);
  color: var(--chip-text);
  padding: 8px 12px;
  font-size: 0.84rem;
  cursor: pointer;
}

.chip:hover {
  border-color: #9fb7d2;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.toggle-row input[type="checkbox"] {
  margin: 0;
}

.graph-actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.legend {
  margin-top: 12px;
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.85rem;
}

.legend span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.legend-author {
  background: var(--author);
}

.legend-query {
  background: var(--query);
}

.legend-paper {
  background: var(--paper);
}

.legend-topic {
  background: var(--topic);
}

.main-panel {
  display: grid;
  gap: 12px;
  align-content: start;
}

.tab-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
}

.tab-button {
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  padding: 9px;
  cursor: pointer;
}

.tab-button[aria-selected="true"] {
  color: #052f5a;
  border-color: #9fc8f5;
  background: var(--brand-soft);
}

.status-banner {
  border: 1px solid #b6dbff;
  border-radius: 12px;
  background: #edf7ff;
  color: #17426d;
  padding: 10px 12px;
  font-size: 0.9rem;
}

.redaction-banner {
  border: 1px solid #facc15;
  border-radius: 12px;
  background: #fffbeb;
  color: #854d0e;
  padding: 10px 12px;
  font-size: 0.9rem;
}

.state-card {
  border: 1px dashed var(--line-strong);
  border-radius: 11px;
  padding: 16px;
  color: var(--muted);
  background: var(--surface-alt);
}

.state-card.error {
  border-style: solid;
  border-color: #fecaca;
  color: var(--danger-text);
  background: var(--danger-bg);
}

.error-inline {
  color: var(--danger-text);
}

.tab-panel {
  min-height: 360px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.panel-header h2 {
  margin: 0;
}

.muted {
  color: var(--muted);
  margin: 0;
  font-size: 0.86rem;
}

.results-grid {
  display: grid;
  gap: 10px;
}

.cards {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}

.card h3 {
  margin: 0;
  font-size: 1rem;
}

.card p {
  margin: 7px 0 0;
}

.paper-snippet {
  color: var(--text);
}

.paper-meta,
.meta-list {
  margin-top: 8px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.78rem;
  background: var(--chip-bg);
  color: var(--chip-text);
  border: 1px solid #c6d7ea;
}

.pill.subtle {
  background: #f4f7fb;
}

.score-grid {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.score-row {
  display: grid;
  grid-template-columns: 90px 1fr 45px;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.score-bar {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: #e8eef5;
  overflow: hidden;
}

.score-bar > span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: linear-gradient(90deg, #74b6ff 0%, #2b7cd5 100%);
}

.why-details {
  margin-top: 9px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.why-details summary {
  cursor: pointer;
  color: #0a3f74;
  font-weight: 700;
}

.ask-form {
  display: grid;
  gap: 7px;
  margin-bottom: 12px;
}

.ask-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.ask-layout {
  display: grid;
  gap: 10px;
}

.answer {
  white-space: pre-wrap;
}

.list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 7px;
}

.compact-list {
  padding-left: 16px;
}

.compact-list li {
  display: grid;
  gap: 2px;
}

.onboarding-grid {
  margin-top: 12px;
}

.list .redacted {
  color: var(--danger-text);
  font-weight: 700;
}

.skeleton-grid {
  display: grid;
  gap: 10px;
}

.skeleton-card,
.skeleton-graph {
  border-radius: 11px;
  background: linear-gradient(110deg, #eef2f7 30%, #f8fafd 45%, #eef2f7 60%);
  background-size: 200% 100%;
  animation: shimmer 1.1s linear infinite;
  border: 1px solid #e2e8f0;
}

.skeleton-card {
  height: 118px;
}

.skeleton-graph {
  height: 520px;
}

@keyframes shimmer {
  from {
    background-position: 200% 0;
  }
  to {
    background-position: -200% 0;
  }
}

.graph-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 10px;
}

#graph-canvas {
  width: 100%;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fbff;
}

.node-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-alt);
  padding: 10px;
}

.node-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.node-panel-header h3 {
  margin: 0;
}

.node-details {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 8px;
  row-gap: 6px;
  font-size: 0.84rem;
}

.node-details dt {
  font-weight: 700;
}

.node-details dd {
  margin: 0;
  color: var(--muted);
}

.noscript {
  max-width: 900px;
  margin: 16px auto;
  padding: 12px;
  border: 1px solid #fecaca;
  border-radius: 10px;
  background: #fff1f2;
  color: var(--danger-text);
}

.debug-output {
  margin-top: 10px;
  max-height: 420px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 10px;
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.83rem;
  white-space: pre-wrap;
}

.page {
  max-width: 1024px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

.page.narrow {
  max-width: 680px;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.session-meta {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-size: 0.85rem;
}

.back-link {
  display: inline-block;
  margin-top: 12px;
  text-decoration: none;
  font-size: 0.9rem;
}

.landing-page {
  display: grid;
  gap: 12px;
}

.landing-hero h1 {
  margin: 4px 0 6px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.landing-subtitle {
  margin: 0 0 12px;
  max-width: 78ch;
  color: var(--muted);
}

.landing-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.landing-cta {
  min-width: 170px;
}

.landing-capabilities {
  margin-top: 8px;
}

.landing-capabilities .card h3 {
  margin-bottom: 4px;
}

.landing-steps {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.landing-footer {
  margin: 6px 0 2px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

@media (max-width: 1180px) {
  .top-nav {
    grid-template-columns: 1fr;
  }

  .mode-badges,
  .session-actions {
    justify-content: flex-start;
  }

  .top-nav-links {
    flex-wrap: wrap;
  }
}

@media (max-width: 980px) {
  .layout-grid {
    grid-template-columns: 1fr;
  }

  .left-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .left-panel .panel:last-child {
    grid-column: 1 / -1;
  }

  .graph-shell {
    grid-template-columns: 1fr;
  }

  #graph-canvas {
    min-height: 430px;
  }
}

@media (max-width: 760px) {
  .left-panel {
    grid-template-columns: 1fr;
  }

  .tab-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ask-controls {
    grid-template-columns: 1fr;
  }

  .session-meta {
    flex-direction: column;
    gap: 3px;
  }
}