@font-face {
  font-family: "JetBrains Mono";
  src: url("JetBrainsMono-VariableFont_wght.ttf") format("truetype");
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --xin-blue: #5277c3;
  --xin-blue-dk: #3f5ea0;
  --xin-sky: #7ebae4;
  --xin-ink: #16202e;
  --xin-muted: #5d6b7f;
  --xin-line: #dce3ed;
  --xin-bg: #f4f6f9;
  --xin-surface: #ffffff;
  --xin-hover: #eef2f8;
  --xin-tint: #edf2fa;
  --xin-tint-line: #cbd8ec;
  --xin-ok: #2e7d5b;
  --xin-warn: #b4552a;
  --xin-radius: 10px;
  --xin-shadow:
    0 1px 2px rgba(22, 32, 46, 0.06), 0 8px 24px rgba(22, 32, 46, 0.06);
  --xin-font: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --xin-mono: var(--xin-font);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--xin-bg);
  color: var(--xin-ink);
  font-family: var(--xin-font);
  font-size: 15px;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

.xin-header {
  background: var(--xin-surface);
  border-bottom: 1px solid var(--xin-line);
}

.xin-header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.xin-logo {
  width: 30px;
  height: 30px;
  flex: none;
}

.xin-wordmark {
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--xin-ink);
  text-decoration: none;
}

.xin-service {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--xin-muted);
}

.xin-badge {
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--xin-blue-dk);
  background: rgba(82, 119, 195, 0.1);
  border: 1px solid rgba(82, 119, 195, 0.22);
  border-radius: 999px;
  padding: 3px 10px;
}

.xin-main {
  flex: 1;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.xin-title {
  margin: 0 0 6px;
  font-size: 26px;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.xin-lede {
  margin: 0 0 28px;
  color: var(--xin-muted);
  max-width: 62ch;
}

.xin-card {
  background: var(--xin-surface);
  border: 1px solid var(--xin-line);
  border-radius: var(--xin-radius);
  box-shadow: var(--xin-shadow);
  padding: 22px;
}
.xin-card + .xin-card {
  margin-top: 18px;
}

.xin-label,
.xin-card-title,
.xin-table thead th {
  font-size: 11.5px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--xin-muted);
}
.xin-card-title {
  margin: 0 0 14px;
}

.xin-note {
  margin: 14px 0 0;
  min-height: 20px;
  text-align: center;
  font-size: 13px;
  color: var(--xin-muted);
}

.xin-empty {
  color: var(--xin-muted);
  font-size: 14.5px;
  text-align: center;
  padding: 26px 10px;
  border: 1px dashed var(--xin-line);
  border-radius: 8px;
}

.xin-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.xin-btn {
  font: inherit;
  font-weight: 550;
  color: var(--xin-ink);
  background: var(--xin-surface);
  border: 1px solid var(--xin-line);
  border-radius: 8px;
  padding: 9px 14px;
  cursor: pointer;
  transition:
    background 0.12s,
    border-color 0.12s,
    transform 0.04s;
}
.xin-btn:hover {
  background: var(--xin-hover);
  border-color: #c6d2e4;
}
.xin-btn:active {
  transform: translateY(1px);
}
.xin-btn-sm {
  font-size: 13.5px;
  padding: 6px 11px;
  color: var(--xin-muted);
}

.xin-btn-primary {
  color: #fff;
  background: var(--xin-blue);
  border-color: var(--xin-blue);
}
.xin-btn-primary:hover {
  background: var(--xin-blue-dk);
  border-color: var(--xin-blue-dk);
}

.xin-btn.is-on,
.xin-tab[aria-selected="true"] {
  color: #fff;
  background: var(--xin-blue);
  border-color: var(--xin-blue);
}

.xin-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}
.xin-tab {
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  color: var(--xin-muted);
  background: var(--xin-surface);
  border: 1px solid var(--xin-line);
  border-radius: 999px;
  padding: 7px 15px;
  cursor: pointer;
  transition:
    background 0.12s,
    color 0.12s,
    border-color 0.12s;
}
.xin-tab:hover {
  background: var(--xin-hover);
}

.xin-input,
select.xin-input {
  font: inherit;
  color: var(--xin-ink);
  background: var(--xin-surface);
  border: 1px solid var(--xin-line);
  border-radius: 8px;
  padding: 9px 11px;
  width: 100%;
}
.xin-input::placeholder {
  color: #9aa6b8;
}

.xin-btn:focus-visible,
.xin-tab:focus-visible,
.xin-input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--xin-blue);
  outline-offset: 2px;
}

.xin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.xin-table th,
.xin-table td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--xin-line);
}
.xin-table tbody tr:last-child td {
  border-bottom: 0;
}
.xin-table .num {
  text-align: right;
}

kbd {
  font-size: 0.85em;
  background: var(--xin-hover);
  border: 1px solid var(--xin-line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 5px;
}

.game-card {
  max-width: 560px;
  margin: 0 auto;
}
.game-scores {
  display: flex;
  gap: 10px;
}
.game-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 82px;
  padding: 7px 12px;
  background: var(--xin-tint);
  border: 1px solid var(--xin-tint-line);
  border-radius: 8px;
}
.game-score-value {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
}
.game-buttons {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.game-stage {
  position: relative;
}
.game-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--xin-ink);
  border-radius: 10px;
  outline: none;
}
.game-canvas:focus-visible {
  box-shadow: 0 0 0 2px var(--xin-blue);
}

.game-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  padding: 20px;
  background: rgba(244, 246, 249, 0.88);
  border-radius: 10px;
  backdrop-filter: blur(2px);
}
/* Override display: flex when the overlay is hidden. */
.game-overlay[hidden] {
  display: none;
}
.game-overlay-title {
  margin: 0;
  font-size: 24px;
  font-weight: 650;
}
.game-overlay-text {
  margin: 0 0 8px;
  color: var(--xin-muted);
  font-size: 14.5px;
  max-width: 34ch;
}
.game-overlay-buttons {
  display: flex;
  gap: 8px;
}

.xin-footer {
  border-top: 1px solid var(--xin-line);
  background: var(--xin-surface);
}

.xin-footer-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: center;
  font-size: 12.5px;
  color: var(--xin-muted);
}

@media (max-width: 560px) {
  .xin-header-inner {
    flex-wrap: wrap;
  }
  .xin-service {
    margin-left: 0;
    width: 100%;
  }
  .xin-main {
    padding: 24px 16px 40px;
  }
  .xin-card {
    padding: 18px;
  }
  .xin-title {
    font-size: 22px;
  }
}