:root {
  color-scheme: light;
  --page: #f4f6fa;
  --panel: #ffffff;
  --ink: #141b2d;
  --muted: #626d7f;
  --muted-2: #8a94a6;
  --line: #dce2eb;
  --line-strong: #c6cfdd;
  --navy: #0b1633;
  --blue: #2f57a6;
  --blue-soft: #e8eefc;
  --indigo: #6656bd;
  --indigo-soft: #efecff;
  --violet: #7a4d93;
  --violet-soft: #f4eefa;
  --green: #2f855a;
  --green-soft: #e7f2eb;
  --yellow: #c98a12;
  --yellow-soft: #fff4d8;
  --gold: #d7a51d;
  --silver: #8793a5;
  --bronze: #a96736;
  --red: #c1434b;
  --red-soft: #fae4e6;
  --gray: #a6b0bf;
  --gray-soft: #eff2f6;
  --radius: 8px;
  --shadow: 0 18px 34px rgba(20, 30, 54, 0.09), 0 2px 8px rgba(20, 30, 54, 0.04);
  --shadow-soft: 0 10px 22px rgba(20, 30, 54, 0.06);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
  background: var(--page);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.45;
  background:
    linear-gradient(180deg, #f9fbff 0, #f2f5fa 36%, #f6f4f8 100%);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: default;
}

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

.site-header {
  min-height: 58px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: rgba(252, 253, 255, 0.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--navy);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.brand-mark,
.hero-mark {
  display: inline-grid;
  place-items: center;
  border: 0;
  background: transparent;
}

.brand-mark {
  width: 34px;
  height: 34px;
  padding: 0;
  filter: drop-shadow(0 4px 8px rgba(11, 22, 51, 0.1));
}

.hero-mark {
  grid-row: 1 / span 2;
  width: 44px;
  height: 44px;
  margin: 0;
  padding: 0;
  box-shadow: none;
  filter: drop-shadow(0 6px 12px rgba(11, 22, 51, 0.12));
}

.brand-mark img,
.hero-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  min-width: 0;
  color: #6f7888;
  font-size: 13px;
}

.legend-leak {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
  color: var(--muted);
}

.leak-icon {
  width: 17px;
  height: 17px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid #d5a51f;
  background: var(--yellow-soft);
  color: #6c4700;
  font-size: 12px;
  font-weight: 900;
  line-height: 1;
}

.arena-page {
  width: min(1560px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 12px 0 52px;
}

.notice-strip {
  width: min(1120px, 100%);
  margin: 10px auto 11px;
  display: flex;
  gap: 7px;
  align-items: flex-start;
  padding: 7px 11px;
  border: 1px solid #e1d2a3;
  border-left: 5px solid var(--gold);
  border-radius: var(--radius);
  background: #fffdf7;
  color: #4f4128;
  font-size: 13px;
  box-shadow: var(--shadow-soft);
}

.notice-strip strong {
  color: #2b2214;
  white-space: nowrap;
}

.notice-strip span {
  min-width: 0;
  overflow: visible;
  text-overflow: clip;
  white-space: pre-line;
  overflow-wrap: anywhere;
  line-height: 1.35;
}

.competition-controls {
  width: min(1560px, 100%);
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.control-label {
  color: var(--muted-2);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

.category-tabs,
.competition-tabs,
.legend,
.score-tags,
.detail-kicker {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.category-tabs,
.competition-tabs {
  justify-content: center;
  gap: 7px;
  min-width: 0;
}

.tab-button,
.competition-button {
  min-height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.78);
  color: #273246;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.85) inset;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.tab-button {
  padding: 8px 12px;
  font-weight: 800;
}

.competition-button {
  min-height: 32px;
  padding: 6px 8px;
  font-size: 12.5px;
  font-weight: 700;
}

.tab-button.active,
.competition-button.active {
  color: #fff;
  border-color: var(--navy);
  background: var(--navy);
  box-shadow: 0 8px 18px rgba(11, 22, 51, 0.22);
}

.competition-button.active {
  border-color: var(--indigo);
  background: var(--indigo);
  box-shadow: 0 7px 16px rgba(102, 86, 189, 0.2);
}

.tab-button:hover,
.competition-button:hover,
.search-box:focus-within {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(102, 86, 189, 0.14);
}

.benchmark-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 480px);
  gap: 16px;
  align-items: start;
}

.benchmark-workbench.summary-mode {
  grid-template-columns: minmax(0, 920px);
  justify-content: center;
}

.benchmark-workbench.overall-mode {
  grid-template-columns: minmax(0, 1fr);
}

.leaderboard-card,
.detail-panel,
.fallback-shell {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.leaderboard-card {
  border-top: 3px solid var(--navy);
}

.detail-panel {
  border-top: 3px solid var(--indigo);
}

.leaderboard-toolbar {
  min-height: 76px;
  padding: 16px 16px 14px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.leaderboard-toolbar h3 {
  margin: 0 0 4px;
  color: var(--navy);
  font-size: 22px;
  line-height: 1.15;
  letter-spacing: 0;
  font-weight: 740;
}

.leaderboard-toolbar p,
.detail-muted,
.table-hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.search-box {
  width: min(280px, 38vw);
  min-height: 38px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: #fbfcff;
  color: var(--muted);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-box span {
  flex: 0 0 auto;
  font-size: 12px;
  font-weight: 800;
  color: #536076;
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
}

.legend.compact {
  gap: 12px;
  padding: 9px 16px;
  border-bottom: 1px solid var(--line);
  background: #fafbfe;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
}

.swatch {
  width: 12px;
  height: 12px;
  display: inline-block;
  border-radius: 3px;
}

.swatch.high {
  background: var(--green);
}

.swatch.mid {
  background: var(--yellow);
}

.swatch.low {
  background: var(--red);
}

.swatch.invalid {
  background: var(--gray);
}

.arena-table-wrap {
  overflow: auto;
  background: #fff;
}

.arena-table {
  width: max-content;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 0;
}

.summary-table {
  margin: 0 auto;
}

.model-col {
  width: 218px;
}

.metric-col {
  width: 94px;
}

.rank-col {
  width: 62px;
}

.overall-score-col {
  width: 126px;
}

.overall-benchmark-col {
  width: 112px;
}

.problem-col {
  width: 30px;
}

.arena-table th,
.arena-table td {
  border-right: 1px solid #e2e7ef;
  border-bottom: 1px solid #e2e7ef;
}

.arena-table th {
  position: sticky;
  top: 0;
  z-index: 4;
  background: #eef1f6;
  color: #2b3446;
  font-size: 12px;
  text-align: left;
  font-weight: 760;
  box-shadow: inset 0 -1px 0 #cbd3df;
}

.arena-table th:first-child,
.arena-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 5;
  background: #fff;
}

.arena-table th:first-child {
  z-index: 6;
  background: #eef1f6;
}

.summary-table th:first-child,
.summary-table td:first-child {
  position: static;
}

.arena-table tbody tr:hover td {
  background: #fbfbff;
}

.arena-table tbody tr:hover td:first-child {
  background: #fbfbff;
}

.arena-table tbody tr:nth-child(even) td {
  background: #fcfdff;
}

.arena-table tbody tr:nth-child(even) td:first-child {
  background: #fcfdff;
}

.arena-table tbody tr:hover td,
.arena-table tbody tr:hover td:first-child {
  background: #fbfbff;
}

.model-cell {
  width: 218px;
  min-width: 218px;
  max-width: 218px;
  padding: 4px 7px;
  vertical-align: middle;
}

.metric-head {
  min-width: 94px;
  width: 94px;
  padding: 7px;
}

.rank-head,
.overall-score-head,
.overall-benchmark-head {
  padding: 7px;
}

.rank-head {
  width: 62px;
}

.overall-score-head {
  width: 126px;
}

.overall-benchmark-head {
  width: 112px;
}

.rank-value {
  color: var(--navy);
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.summary-table .model-col {
  width: 360px;
}

.summary-table .metric-col,
.summary-table .metric-head {
  width: 400px;
}

.summary-table .model-cell {
  width: 360px;
  min-width: 360px;
  max-width: 360px;
}

.core-overall-table .model-col,
.core-overall-table .model-cell {
  width: 342px;
  min-width: 342px;
  max-width: 342px;
}

.core-overall-table .metric-col,
.core-overall-table .metric-head {
  width: 182px;
}

.core-overall-table .metric-head {
  text-align: center;
}

.core-overall-table .metric-cell {
  min-height: 38px;
}

.core-score-table .model-col,
.core-score-table .model-cell {
  width: 342px;
  min-width: 342px;
  max-width: 342px;
}

.core-score-table .metric-col,
.core-score-table .metric-head {
  width: 518px;
}

.benchmark-workbench.summary-mode .leaderboard-toolbar {
  min-height: 104px;
  padding: 22px 24px 20px;
}

.benchmark-workbench.summary-mode .leaderboard-toolbar h3 {
  font-size: 28px;
}

.benchmark-workbench.summary-mode .leaderboard-toolbar p {
  font-size: 15px;
  line-height: 1.45;
}

.benchmark-workbench.summary-mode .search-box {
  width: min(300px, 38vw);
  min-height: 44px;
  padding: 9px 12px;
}

.benchmark-workbench.summary-mode .arena-table th {
  font-size: 13.5px;
}

.benchmark-workbench.summary-mode .arena-table td {
  height: 48px;
  padding: 5px;
}

.benchmark-workbench.summary-mode .model-cell {
  padding: 6px 10px;
}

.benchmark-workbench.summary-mode .model-name {
  font-size: 13.5px;
}

.benchmark-workbench.summary-mode .model-sub {
  margin-top: 2px;
  font-size: 11.5px;
}

.benchmark-workbench.summary-mode .tag {
  min-height: 17px;
  padding: 1px 6px;
  font-size: 10px;
}

.benchmark-workbench.summary-mode .metric-cell {
  min-height: 38px;
  border-radius: 7px;
}

.benchmark-workbench.summary-mode .metric-content {
  gap: 2px;
  padding: 5px 8px;
}

.benchmark-workbench.summary-mode .metric-content strong {
  font-size: 14px;
}

.benchmark-workbench.summary-mode .metric-content small {
  font-size: 11px;
}

.core-overall-table tbody tr:nth-child(-n+4) td {
  background: #fffdf7;
}

.core-overall-table tbody tr:nth-child(4) td {
  border-bottom: 2px solid #d7bf76;
}

.core-overall-table tbody tr:nth-child(n+5) td {
  background: #fcfdff;
}

.arena-table td {
  height: 34px;
  padding: 3px;
  background: #fff;
}

.model-title-row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.model-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 780;
  font-size: 11.5px;
  color: var(--ink);
}

.model-sub {
  margin-top: 0;
  color: var(--muted);
  font-size: 10px;
}

.score-tags {
  flex: 0 0 auto;
  gap: 4px;
  margin-top: 0;
  flex-wrap: nowrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 14px;
  padding: 0 5px;
  border-radius: 5px;
  background: #f5f7fb;
  border: 1px solid rgba(23, 32, 51, 0.12);
  color: #3b485b;
  font-size: 9px;
  white-space: nowrap;
  line-height: 1.2;
}

.tag.safe {
  background: #edf7ef;
  color: #246447;
}

.tag.warn {
  background: var(--yellow-soft);
  color: #704900;
}

.tag.compact-warn {
  width: 14px;
  padding: 0;
  border-color: #e0b84d;
  font-weight: 900;
}

.tag.rank {
  background: var(--blue-soft);
  color: #2d4d88;
}

.tag.medal-tag {
  background: #fff8df;
  border-color: #e8c765;
  color: #5d4710;
}

.tag.medal-winner {
  background: #fff2bd;
  border-color: #d7a51d;
  color: #4e3700;
}

.tag.medal-gold {
  background: #fff7d8;
  border-color: #e0bd54;
  color: #604600;
}

.tag.medal-silver {
  background: #f3f5f8;
  border-color: #c6ced9;
  color: #4f5c70;
}

.tag.medal-bronze {
  background: #fff0e5;
  border-color: #d9a178;
  color: #70431f;
}

.tag.invalid {
  background: var(--gray-soft);
  color: #5e6876;
}

.metric-cell {
  min-height: 28px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  border: 1px solid rgba(20, 27, 45, 0.1);
  border-radius: 6px;
  background: #f9fafc;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.metric-accuracy {
  border-color: rgba(var(--metric-score-rgb, 46, 204, 113), 0.3);
  background: rgba(var(--metric-score-rgb, 46, 204, 113), 0.17);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.metric-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  opacity: 0.9;
}

.metric-accuracy .metric-fill {
  background: linear-gradient(90deg, rgba(var(--metric-score-rgb, 46, 204, 113), 0.2), rgba(var(--metric-score-rgb, 46, 204, 113), 0.04));
}

.metric-accuracy .metric-content strong {
  color: #172033;
  text-shadow: none;
}

.metric-accuracy .metric-content small {
  color: rgba(23, 32, 51, 0.72);
  text-shadow: none;
}

.metric-cost .metric-fill {
  background: linear-gradient(90deg, rgba(201, 138, 18, 0.28), rgba(201, 138, 18, 0.09));
}

.metric-tokens .metric-fill {
  background: linear-gradient(90deg, rgba(47, 87, 166, 0.26), rgba(47, 87, 166, 0.08));
}

.metric-invalid .metric-fill {
  background: var(--gray-soft);
}

.metric-invalid .metric-content strong {
  color: var(--muted);
}

.metric-content {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1px;
  padding: 3px 5px;
}

.metric-content strong {
  font-size: 11.5px;
  line-height: 1.1;
  color: #172033;
}

.metric-content small {
  color: var(--muted);
  font-size: 9.5px;
}

.problem-head {
  min-width: 30px;
  width: 30px;
  max-width: 30px;
  height: 84px;
  padding: 3px;
  text-align: center;
  vertical-align: bottom;
}

.problem-head span {
  display: inline-block;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  white-space: nowrap;
  max-height: 76px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.problem-cell-wrap {
  width: 30px;
  min-width: 30px;
  padding: 3px;
}

.problem-cell {
  width: 18px;
  height: 18px;
  display: block;
  margin: 0 auto;
  padding: 0;
  border: 1px solid rgba(20, 27, 45, 0.16);
  border-radius: 4px;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.problem-cell:hover:not(:disabled) {
  border-color: rgba(20, 27, 45, 0.42);
  box-shadow: 0 4px 12px rgba(20, 30, 54, 0.16);
  transform: scale(1.08);
}

.problem-cell.correct {
  background: var(--green);
}

.problem-cell.wrong {
  background: var(--red);
}

.problem-cell.partial {
  background: var(--yellow);
}

.problem-cell.invalid,
.problem-cell.missing,
.problem-cell.loading {
  background: repeating-linear-gradient(135deg, #d3dbe5, #d3dbe5 4px, #eef2f6 4px, #eef2f6 8px);
}

.problem-cell.no-detail {
  border-style: dashed;
  background: #eef2f6;
  opacity: 0.45;
  box-shadow: none;
}

.problem-cell.active {
  outline: 3px solid var(--indigo);
  outline-offset: 1px;
}

.table-hint {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  background: #fafbfe;
}

.detail-panel {
  position: sticky;
  top: 74px;
  max-height: calc(100vh - 88px);
  overflow: auto;
}

.empty-detail,
.detail-content {
  padding: 16px;
}

.empty-detail h3,
.detail-content h3 {
  margin: 0 0 8px;
  color: var(--navy);
  font-size: 20px;
  line-height: 1.18;
  letter-spacing: 0;
}

.detail-kicker {
  gap: 7px;
  margin-bottom: 12px;
}

.detail-box {
  margin-top: 14px;
  padding: 13px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset, var(--shadow-soft);
}

.detail-box h4 {
  margin: 0 0 8px;
  color: #263347;
  font-size: 13px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0;
}

.problem-box {
  border-top-color: var(--blue);
}

.response-box {
  border-top-color: var(--yellow);
}

.judgment-box {
  border-top-color: var(--bronze);
}

.solution-box {
  border-top-color: var(--green);
}

.rubric-box {
  border-top-color: var(--violet);
}

.error-box {
  border-top-color: var(--red);
}

pre.text-block {
  margin: 0;
  max-height: 360px;
  overflow: auto;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcff;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.55;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.question-stack {
  display: grid;
  gap: 10px;
}

.question-text-block {
  max-height: 520px;
}

.media-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 2px 2px 8px;
  scroll-snap-type: x proximity;
}

.question-figure {
  flex: 0 0 min(320px, 82vw);
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  box-shadow: var(--shadow-soft);
  scroll-snap-align: start;
}

.question-figure a {
  display: block;
  padding: 8px;
  background: #fff;
}

.question-figure img {
  display: block;
  width: 100%;
  height: 210px;
  object-fit: contain;
  background: #fff;
}

.question-figure figcaption {
  display: grid;
  gap: 4px;
  padding: 8px 9px 10px;
  border-top: 1px solid var(--line);
  background: #fcfdff;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.question-figure figcaption strong {
  color: #263347;
  font-size: 12px;
}

.question-figure ul {
  margin: 0;
  padding-left: 16px;
}

.fallback-frame {
  display: block;
  width: 100%;
  height: 420px;
  border: 0;
}

.fallback-shell {
  margin-top: 16px;
}

.fallback-shell[hidden] {
  display: none;
}

.runtime-error {
  width: min(1120px, calc(100vw - 32px));
  margin: 12px auto;
  padding: 10px 12px;
  border: 1px solid #e1b4b4;
  border-radius: var(--radius);
  background: #fff6f6;
  color: #8d2f2f;
}

.loading,
.error,
.empty-state {
  padding: 18px;
  color: var(--muted);
}

.error {
  color: #8d2f2f;
}

.empty-state {
  min-height: 92px;
  display: grid;
  place-items: center;
  border-top: 1px solid var(--line);
  background: #fafbfe;
  font-size: 13px;
}

html {
  scroll-behavior: smooth;
}

.nav-link {
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  color: #4a5568;
  font-weight: 650;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover {
  color: var(--navy);
  border-bottom-color: var(--indigo);
}

.venue-pill {
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--indigo-soft);
  color: var(--indigo);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.lang-toggle {
  min-width: 44px;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--navy);
  font-size: 13px;
  font-weight: 750;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.lang-toggle:hover {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(102, 86, 189, 0.14);
}

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(140, 120, 255, 0.35), transparent 60%),
    radial-gradient(700px 380px at 0% 110%, rgba(47, 87, 166, 0.5), transparent 60%),
    linear-gradient(135deg, #0b1633 0%, #1b2a5c 55%, #3a2f7a 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 90%);
  mask-image: linear-gradient(180deg, #000, transparent 90%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 64px 0 60px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.9fr);
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #e6e9ff;
  font-size: 12.5px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  margin: 10px 0 0;
  color: #c9d2f5;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 600;
}

.hero-lead {
  max-width: 640px;
  margin: 18px 0 0;
  color: #dfe4f7;
  font-size: 16px;
  line-height: 1.65;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  color: #fff;
  font-weight: 750;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.15s ease;
}

.hero-button:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.hero-button.primary {
  border-color: #fff;
  background: #fff;
  color: var(--navy);
}

.hero-button.primary:hover {
  background: #eef1ff;
}

.hero-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.hero-stats div {
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
}

.hero-stats dt {
  color: #b8c2ea;
  font-size: 12.5px;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.hero-stats dd {
  margin: 4px 0 0;
  font-size: 36px;
  font-weight: 800;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-section {
  padding: 56px 0 8px;
  scroll-margin-top: 64px;
}

.section-head {
  max-width: 860px;
  margin: 0 auto 24px;
  text-align: center;
}

.section-eyebrow {
  margin: 0 0 8px;
  color: var(--indigo);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.2;
  font-weight: 780;
  letter-spacing: -0.01em;
}

.section-lead {
  max-width: 760px;
  margin: 12px auto 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.65;
}

.highlight-grid {
  width: min(1200px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.highlight-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--indigo);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  color: var(--ink);
  text-align: left;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.highlight-card:nth-child(2) {
  border-top-color: var(--gold);
}

.highlight-card:nth-child(3) {
  border-top-color: var(--green);
}

.highlight-card:nth-child(4) {
  border-top-color: var(--violet);
}

.highlight-card:hover,
.competition-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.highlight-label {
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.highlight-value {
  color: var(--navy);
  font-size: 30px;
  line-height: 1.15;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.highlight-text {
  color: #4b5567;
  font-size: 14px;
  line-height: 1.55;
}

.highlight-note,
.section-footnote {
  width: min(860px, 100%);
  margin: 18px auto 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
}

.section-footnote {
  color: var(--muted-2);
  font-size: 13px;
}

.method-grid {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.method-card {
  position: relative;
  padding: 24px 24px 24px 78px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.method-step {
  position: absolute;
  top: 22px;
  left: 22px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--navy), var(--indigo));
  color: #fff;
  font-weight: 800;
}

.method-card h3 {
  margin: 0 0 8px;
  color: var(--navy);
  font-size: 18px;
  line-height: 1.3;
}

.method-card p {
  margin: 0;
  color: #4b5567;
  font-size: 14.5px;
  line-height: 1.65;
}

.leak-icon.inline {
  vertical-align: -3px;
}

.method-card .tag.safe {
  font-size: 11px;
  vertical-align: 1px;
}

.competition-grid {
  width: min(1200px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.competition-card {
  --accent: var(--blue);
  --accent-soft: var(--blue-soft);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: 0 1px 2px rgba(20, 30, 54, 0.04);
  color: var(--ink);
  text-align: left;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.competition-card.discipline-chemistry {
  --accent: var(--violet);
  --accent-soft: var(--violet-soft);
}

.competition-card.discipline-biology {
  --accent: var(--green);
  --accent-soft: var(--green-soft);
}

.discipline-chip {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11.5px;
  font-weight: 800;
}

.competition-card strong {
  color: var(--navy);
  font-size: 17px;
}

.competition-full-name {
  color: #4b5567;
  font-size: 13px;
}

.competition-facts {
  color: var(--muted-2);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}

.site-footer {
  margin-top: 64px;
  padding: 28px 16px 36px;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 13.5px;
  text-align: center;
}

.site-footer div {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 10px;
}

.site-footer strong {
  color: var(--navy);
}

.site-footer p {
  margin: 8px 0 0;
}

@media (max-width: 1080px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 0 44px;
  }

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

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

  .detail-panel {
    position: static;
    max-height: none;
  }
}

@media (max-width: 760px) {
  .leaderboard-toolbar,
  .notice-strip {
    align-items: stretch;
    flex-direction: column;
  }

  .site-header {
    padding: 10px 14px;
  }

  .nav-link {
    display: none;
  }

  .hero-inner {
    width: calc(100vw - 32px);
    padding: 36px 0 32px;
  }

  .hero-stats div {
    padding: 14px 16px;
  }

  .hero-stats dd {
    font-size: 28px;
  }

  .page-section {
    padding-top: 40px;
  }

  .highlight-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .method-card {
    padding: 20px 18px 20px 70px;
  }

  .method-step {
    left: 18px;
  }

  .header-nav {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px;
  }

  .arena-page {
    width: min(100vw - 16px, 1560px);
    padding-top: 12px;
  }

  .notice-strip {
    display: block;
  }

  .notice-strip span {
    display: block;
    overflow: visible;
    white-space: normal;
  }

  .notice-strip strong {
    display: block;
    margin-bottom: 4px;
  }

  .competition-controls {
    justify-content: flex-start;
  }

  .search-box {
    width: 100%;
  }

  .media-rail {
    padding-right: 0;
  }

  .question-figure {
    flex-basis: min(260px, 78vw);
  }
}