:root {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --text: #152033;
  --muted: #667085;
  --line: #d8e1ee;
  --accent: #0f7ae5;
  --accent-soft: #e6f1fd;
  --success: #138f5b;
  --warning: #c47d00;
  --danger: #c93434;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 122, 229, 0.06), transparent 28%),
    var(--bg);
}

.app-shell {
  min-height: 100vh;
  padding: 20px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 18px;
}

.topbar h1,
.panel h2,
.article-card h3 {
  margin: 0;
}

.topbar p {
  margin: 6px 0 0;
  color: var(--muted);
  max-width: 720px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(360px, 460px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.graph-panel {
  min-height: 760px;
  display: flex;
  flex-direction: column;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.field span {
  font-size: 14px;
  font-weight: 600;
}

.field.compact {
  margin: 0;
  min-width: 220px;
}

.topbar-actions {
  display: flex;
  gap: 12px;
  align-items: end;
  flex-wrap: wrap;
}

.field-language {
  min-width: 180px;
}

.model-help {
  max-width: 360px;
  font-size: 12px;
  line-height: 1.5;
}

textarea,
select,
button {
  font: inherit;
}

textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 12px;
  color: var(--text);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

textarea:focus,
select:focus {
  outline: none;
  border-color: rgba(15, 122, 229, 0.45);
  box-shadow: 0 0 0 3px rgba(15, 122, 229, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.button-row {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  min-width: 132px;
  transition: transform 120ms ease, opacity 120ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: default;
  opacity: 0.6;
}

button.primary {
  background: var(--accent);
  color: #fff;
}

button.secondary {
  background: var(--accent-soft);
  color: var(--accent);
}

.status {
  padding: 6px 10px;
  border-radius: 999px;
  background: #edf2f7;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.status.loading {
  background: #eef6ff;
  color: var(--accent);
}

.status.success {
  background: #eaf8f1;
  color: var(--success);
}

.status.warning {
  background: #fff6e5;
  color: var(--warning);
}

.status.error {
  background: #feebeb;
  color: var(--danger);
}

.message {
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 16px;
}

.error-box {
  background: #fff1f1;
  color: var(--danger);
  border: 1px solid #f4caca;
}

.hidden {
  display: none;
}

.summary-block + .summary-block {
  margin-top: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.stat-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 10px 12px;
  min-height: 70px;
}

.stat-card span {
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 18px;
}

.summary-content {
  color: var(--text);
  line-height: 1.6;
  white-space: pre-wrap;
}

.article-list {
  display: grid;
  gap: 10px;
}

.article-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fafcff;
}

.article-card-failed {
  background: #fff8f8;
  border-color: #f1d3d3;
}

.article-card p {
  margin: 8px 0 10px;
  color: var(--muted);
  line-height: 1.5;
}

.article-card dl {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
}

.article-card dt {
  font-size: 12px;
  color: var(--muted);
}

.article-card dd {
  margin: 4px 0 0;
  font-weight: 600;
}

.article-error {
  margin-top: 10px;
  color: var(--danger);
  font-size: 13px;
}

.muted {
  color: var(--muted);
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
}

.graph-container {
  position: relative;
  min-height: 660px;
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #fbfdff 0%, #f4f8fc 100%);
  overflow: hidden;
}

.graph-container svg {
  width: 100%;
  height: 100%;
  display: block;
}

.node {
  stroke: #ffffff;
  stroke-width: 2px;
}

.node-article,
.legend-dot.node-article {
  background: #0f7ae5;
  fill: #0f7ae5;
}

.node-concept,
.legend-dot.node-concept {
  background: #14b8a6;
  fill: #14b8a6;
}

.node-keyword,
.legend-dot.node-keyword {
  background: #6ea8fe;
  fill: #6ea8fe;
}

.node-entity,
.legend-dot.node-entity {
  background: #8b5cf6;
  fill: #8b5cf6;
}

.hovered {
  stroke: #111827;
}

.link {
  stroke: #93a6bd;
  stroke-opacity: 0.72;
}

.link-co_occurs_with {
  stroke-dasharray: 4 3;
}

.node-label {
  font-size: 12px;
  fill: #1f2937;
  pointer-events: none;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.97);
  color: var(--text);
  font-size: 12px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.12);
}

.empty-state {
  height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.meta {
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .graph-panel {
    min-height: 560px;
  }

  .graph-container {
    min-height: 500px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .topbar-actions {
    width: 100%;
  }

  .article-card dl,
  .stats-grid {
    grid-template-columns: 1fr;
  }
}