:root {
  --solver-ink: #17142a;
  --solver-blue: #2458db;
  --solver-red: #d63232;
  --solver-green: #247d51;
  --solver-yellow: #ffe28a;
  --solver-paper: #fffdf5;
  --solver-line: #d8dfef;
}

.solver-page {
  background:
    linear-gradient(90deg, rgba(36, 88, 219, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(36, 88, 219, 0.06) 1px, transparent 1px),
    var(--solver-paper);
  background-size: 36px 36px;
  color: var(--solver-ink);
}

.solver-hero {
  padding: 44px 20px 26px;
}

.solver-hero h1 {
  max-width: 900px;
  margin: 0;
  color: var(--solver-blue);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(38px, 7vw, 72px);
  line-height: 1.08;
  text-shadow: 3px 3px 0 #ffffff, 5px 5px 0 rgba(23, 20, 42, 0.14);
}

.solver-lead {
  max-width: 840px;
  margin: 18px 0 0;
  color: #34384f;
  font-size: 18px;
}

.solver-tool {
  border: 3px solid var(--solver-ink);
  background: #ffffff;
  box-shadow: 0 18px 48px rgba(37, 48, 90, 0.14);
  padding: 20px;
}

.solver-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 18px;
  align-items: start;
}

.solver-field {
  display: grid;
  gap: 8px;
}

.solver-field label,
.solver-label {
  font-weight: 800;
}

#board-input,
#move-string {
  width: 100%;
  border: 2px solid var(--solver-ink);
  background: #fbfcff;
  color: var(--solver-ink);
  font: 700 16px/1.35 "Courier New", Courier, monospace;
  padding: 12px;
  resize: vertical;
  tab-size: 4;
}

#board-input {
  min-height: 220px;
}

.solver-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.solver-button {
  min-height: 44px;
  border: 2px solid var(--solver-ink);
  background: var(--solver-yellow);
  color: var(--solver-ink);
  padding: 9px 14px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--solver-ink);
}

.solver-button.secondary {
  background: #e8f0ff;
}

.solver-button:hover,
.solver-button:focus-visible {
  background: #adf0bf;
}

.solver-status {
  min-height: 48px;
  border: 2px solid var(--solver-line);
  background: #fffaf0;
  padding: 12px;
  font-weight: 800;
}

.solver-status[data-state="success"] {
  border-color: var(--solver-green);
  background: #edfff2;
}

.solver-status[data-state="error"],
.solver-status[data-state="warning"] {
  border-color: var(--solver-red);
  background: #fff0f0;
}

.solver-status[data-state="working"] {
  border-color: var(--solver-blue);
  background: #eef4ff;
}

.solver-result {
  display: grid;
  gap: 10px;
  min-height: 168px;
  margin-top: 12px;
  border: 2px solid var(--solver-ink);
  background: #f7f9ff;
  padding: 14px;
}

.solver-result h3,
.solver-result p {
  margin: 0;
}

.solver-result h3 {
  color: var(--solver-blue);
  font-size: 22px;
}

.solver-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--solver-line);
  background: #ffffff;
  padding: 8px;
  font-size: 13px;
}

.legend-symbol {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  min-height: 30px;
  border: 2px solid var(--solver-ink);
  background: #e8f0ff;
  font: 900 16px/1 "Courier New", Courier, monospace;
}

.solver-note {
  margin: 10px 0 0;
  color: #5b6075;
  font-size: 13px;
}

.solver-page .paper h2 {
  border-left: 5px solid var(--solver-blue);
  padding-left: 12px;
}

.solver-example {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 16px;
  align-items: stretch;
}

.solver-example pre {
  margin: 0;
  overflow: auto;
  border: 2px solid var(--solver-ink);
  background: #17142a;
  color: #ffffff;
  padding: 16px;
  font: 700 16px/1.35 "Courier New", Courier, monospace;
}

.solver-example .side-card {
  height: 100%;
}

.solver-limit-table td:first-child {
  white-space: nowrap;
}

@media (max-width: 780px) {
  .solver-hero {
    padding: 32px 16px 18px;
  }

  .solver-grid,
  .solver-example {
    grid-template-columns: 1fr;
  }

  .solver-tool {
    padding: 14px;
  }
}

@media (max-width: 520px) {
  .solver-legend {
    grid-template-columns: 1fr;
  }

  .solver-button {
    width: 100%;
  }
}