:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #607086;
  --line: #d9e0ea;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --chip: #edf4f2;
  --danger: #b42318;
  --warning: #92400e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.brand {
  max-width: 720px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 30px;
  line-height: 1.25;
}

h2 {
  font-size: 16px;
}

.subtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.lang-switch {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.lang-btn {
  border: none;
  border-radius: 0;
  background: #fff;
  color: var(--muted);
  min-width: 44px;
  padding: 8px 10px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

.lang-btn + .lang-btn {
  border-left: 1px solid var(--line);
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

#status {
  margin: 6px 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.link-button,
button {
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
}

.link-button {
  padding: 9px 13px;
}

button {
  min-width: 108px;
  padding: 0 18px;
}

button:hover,
.link-button:hover {
  background: var(--accent-strong);
}

.search-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.query-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.search-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font: inherit;
  padding: 9px 10px;
}

input:focus,
select:focus {
  border-color: var(--accent);
  outline: 2px solid rgba(15, 118, 110, 0.16);
}

.examples {
  margin-top: 16px;
}

.examples-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.example-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.example-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip);
  color: var(--accent-strong);
  min-width: 0;
  padding: 7px 14px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.example-chip:hover {
  border-color: var(--accent);
  background: #e2eeeb;
}

.filters-panel {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.filters-panel summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.filters-panel summary::-webkit-details-marker {
  color: var(--muted);
}

.filters {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.7fr 0.7fr 0.7fr;
  gap: 10px;
  margin-top: 14px;
}

.filters label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.filters input,
.filters select {
  margin-top: 6px;
}

.hint {
  background: var(--chip);
  border: 1px solid rgba(15, 118, 110, 0.3);
  border-radius: 8px;
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 600;
  margin: 14px 0 0;
  padding: 10px 14px;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 20px 0 10px;
}

#result-count {
  color: var(--muted);
  font-size: 13px;
}

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

.paper {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.paper h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.paper h3 a {
  color: var(--text);
  text-decoration: none;
}

.paper h3 a:hover {
  color: var(--accent);
}

.title-ru {
  margin: -2px 0 8px;
  color: var(--muted);
  font-size: 14px;
  font-style: italic;
  line-height: 1.35;
}

.meta,
.scores,
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  color: var(--muted);
  font-size: 13px;
}

.abstract {
  margin: 10px 0;
  color: #263445;
  font-size: 14px;
  line-height: 1.5;
}

.abstract-ru {
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
}

.tag {
  border-radius: 999px;
  background: var(--chip);
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 650;
  padding: 3px 8px;
}

.links a {
  color: var(--accent-strong);
  font-weight: 650;
  text-decoration: none;
}

.empty,
.error,
.warning {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.error {
  border-color: rgba(180, 35, 24, 0.35);
  color: var(--danger);
}

.warning {
  border-color: rgba(180, 130, 24, 0.35);
  color: var(--warning);
  margin-bottom: 12px;
  font-weight: 600;
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 20px, 1180px);
    padding-top: 14px;
  }

  .topbar,
  .search-row,
  .results-header {
    align-items: stretch;
    flex-direction: column;
  }

  .search-row,
  .filters {
    grid-template-columns: 1fr;
  }

  button,
  .link-button {
    min-height: 42px;
    text-align: center;
  }

  .topbar-actions {
    justify-content: space-between;
  }

  h1 {
    font-size: 24px;
  }
}