:root {
  color-scheme: dark;
  --canvas: #0d0f0e;
  --panel: #131614;
  --panel-alt: #181b19;
  --line: #343936;
  --line-strong: #59615c;
  --text: #f1f2ed;
  --muted: #a9afa9;
  --quiet: #7d847f;
  --accent: #9fc786;
  --accent-ink: #11180d;
  --yellow: #c6a94b;
  --green: #4d9367;
  --absent: #4a4d4a;
  --danger: #e09a8f;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  background: var(--canvas);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background: var(--canvas);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.site-header,
main,
footer {
  width: min(100% - 48px, 1200px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand img { display: block; }

.source-link,
.text-button {
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
}

.source-link:hover,
.text-button:hover { color: var(--text); }

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  gap: 56px;
  align-items: end;
  padding: 46px 0 34px;
}

.intro h1,
.panel-heading h2,
.result-state h2,
.model-card-heading h2,
.evaluation-heading h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.intro h1 {
  max-width: 650px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.35rem, 5vw, 4.4rem);
  font-weight: 400;
}

.intro > div > p:last-child {
  max-width: 650px;
  margin: 16px 0 0;
  color: var(--muted);
}

.kicker,
.section-label {
  margin: 0 0 10px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.snapshot-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.snapshot-strip div {
  min-width: 0;
  padding: 12px 14px 14px 0;
}

.snapshot-strip div + div {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.snapshot-strip dt {
  margin-bottom: 7px;
  color: var(--quiet);
  font-size: 0.75rem;
}

.snapshot-strip dd {
  margin: 0;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.solver {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(390px, 0.92fr);
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.board-panel,
.result-panel {
  min-width: 0;
  padding: 38px;
}

.board-panel { border-right: 1px solid var(--line-strong); }

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}

.panel-heading h2,
.result-state h2 {
  font-size: clamp(1.45rem, 2vw, 1.9rem);
  font-weight: 620;
}

.text-button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-decoration: underline;
}

.entry-guide {
  margin: 0 0 24px;
  padding: 13px 0;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.board-columns {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 9px;
  margin-bottom: 8px;
  color: var(--quiet);
  font-size: 0.75rem;
  font-weight: 650;
}

.board-columns span:last-child { text-align: center; }

.board {
  display: grid;
  gap: 8px;
}

.board-row {
  display: grid;
  grid-template-columns: 116px repeat(5, minmax(44px, 1fr));
  gap: 8px;
}

.guess-input,
.feedback-tile {
  height: 56px;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.guess-input {
  min-width: 0;
  padding: 0 13px;
  color: var(--text);
  background: transparent;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.guess-input::placeholder {
  color: #747a75;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.guess-input:focus { border-color: var(--line-strong); }

.feedback-tile {
  display: grid;
  place-items: center;
  padding: 0;
  color: white;
  background: #202320;
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
}

.feedback-tile:disabled {
  color: transparent;
  cursor: default;
}

.feedback-tile[data-state="absent"] {
  background: var(--absent);
  border-color: var(--absent);
}

.feedback-tile[data-state="present"] {
  background: var(--yellow);
  border-color: var(--yellow);
}

.feedback-tile[data-state="correct"] {
  background: var(--green);
  border-color: var(--green);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend-tile {
  width: 10px;
  height: 10px;
  border-radius: 1px;
  background: var(--absent);
}

.legend-tile.present { background: var(--yellow); }
.legend-tile.correct { background: var(--green); }

.board-help {
  margin: 18px 0 0;
  color: var(--quiet);
  font-size: 0.8125rem;
}

.error-message {
  min-height: 1.5em;
  margin: 10px 0;
  color: var(--danger);
  font-size: 0.875rem;
}

.primary-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 52px;
  padding: 0 17px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: var(--accent-ink);
  background: var(--accent);
  font-weight: 750;
  cursor: pointer;
}

.primary-button:hover:not(:disabled) { background: #b0d699; }

.primary-button:disabled {
  border-color: var(--line);
  color: var(--quiet);
  background: var(--panel-alt);
  cursor: wait;
}

.result-panel {
  min-height: 620px;
  background: var(--panel-alt);
}

.result-state { height: 100%; }

.result-state > p:not(.section-label, .recommendation-reason) {
  max-width: 46ch;
  color: var(--muted);
}

.word-display {
  margin: 24px 0 20px;
  font-family: var(--mono);
  font-size: clamp(3rem, 6vw, 5.2rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: 0.08em;
}

.recommendation-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-strong);
}

.recommendation-line .word-display { margin: 15px 0 0; }

.icon-button {
  flex: none;
  padding: 8px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--muted);
  background: transparent;
  font-size: 0.8125rem;
  cursor: pointer;
}

.icon-button:hover {
  color: var(--text);
  border-color: var(--text);
}

.recommendation-lead {
  margin-top: 24px !important;
  font-size: 1.125rem !important;
  line-height: 1.4 !important;
  letter-spacing: -0.01em !important;
}

.recommendation-reason {
  margin: 8px 0 22px;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.decision-equation {
  margin-bottom: 24px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.decision-equation span {
  display: block;
  margin-bottom: 7px;
  color: var(--quiet);
  font-size: 0.75rem;
}

.decision-equation code {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0 0 32px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.metric-grid div {
  min-width: 0;
  padding: 13px 11px 14px 0;
}

.metric-grid div + div {
  padding-left: 11px;
  border-left: 1px solid var(--line);
}

.metric-grid dt,
.model-facts dt,
.evaluation-grid dt {
  margin-bottom: 7px;
  color: var(--quiet);
  font-size: 0.75rem;
}

.metric-grid dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.candidate-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.candidate-heading h3 {
  margin: 0;
  font-size: 0.9375rem;
}

.candidate-heading span {
  color: var(--quiet);
  font-size: 0.75rem;
}

.candidate-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.candidate-list li {
  display: flex;
  justify-content: space-between;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.candidate-list strong { letter-spacing: 0.08em; }

.candidate-list span {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.spinner {
  display: block;
  width: 18px;
  height: 18px;
  margin-bottom: 24px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.progress-track {
  height: 3px;
  margin-top: 28px;
  background: var(--line);
}

.progress-track span {
  display: block;
  width: 4%;
  height: 100%;
  background: var(--accent);
  transition: width 140ms ease;
}

.model-card { padding: 96px 0 88px; }

.model-card-heading {
  display: grid;
  grid-template-columns: minmax(240px, 0.7fr) minmax(0, 1.3fr);
  gap: 64px;
  margin-bottom: 36px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line-strong);
}

.model-card-heading .section-label {
  grid-column: 1 / -1;
  margin-bottom: -44px;
}

.model-card-heading h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 400;
}

.model-card-heading > p:last-child {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.model-card-heading em {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.875em;
  font-style: normal;
}

.model-facts,
.evaluation-grid {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.model-facts { grid-template-columns: repeat(3, 1fr); }

.model-facts > div,
.evaluation-grid > div {
  min-width: 0;
  padding: 20px 24px 22px 0;
  border-bottom: 1px solid var(--line);
}

.model-facts > div + div,
.evaluation-grid > div + div {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.model-facts dd,
.evaluation-grid dd {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 1.125rem;
  font-weight: 700;
}

.model-facts p,
.evaluation-grid p,
.evaluation-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

.evaluation-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin: 62px 0 17px;
}

.evaluation-heading h3 { font-size: 1.35rem; }

.evaluation-heading p {
  max-width: 440px;
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  text-align: right;
}

.evaluation-grid { grid-template-columns: repeat(4, 1fr); }

.evaluation-note {
  max-width: 780px;
  margin-top: 20px;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 26px 0 34px;
  color: var(--quiet);
  font-size: 0.8125rem;
  border-top: 1px solid var(--line);
}

footer span {
  color: var(--muted);
  font-weight: 700;
}

footer p { margin: 0; }
[hidden] { display: none !important; }

@media (max-width: 920px) {
  .intro {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .board-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line-strong);
  }

  .result-panel { min-height: 500px; }

  .model-card-heading {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .model-card-heading .section-label {
    grid-column: auto;
    margin-bottom: 0;
  }
}

@media (max-width: 680px) {
  .site-header,
  main,
  footer { width: min(100% - 24px, 1200px); }

  .site-header { min-height: 62px; }
  .intro { padding: 34px 0 24px; }
  .snapshot-strip { grid-template-columns: 1fr; }

  .snapshot-strip div,
  .snapshot-strip div + div {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 0;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .snapshot-strip div:last-child { border-bottom: 0; }
  .snapshot-strip dt { margin: 0; }

  .board-panel,
  .result-panel { padding: 26px 16px; }

  .board-columns { grid-template-columns: 74px 1fr; }

  .board-row {
    grid-template-columns: 74px repeat(5, minmax(34px, 1fr));
    gap: 5px;
  }

  .guess-input,
  .feedback-tile { height: 49px; }

  .guess-input {
    padding-inline: 8px;
    font-size: 0.75rem;
  }

  .legend { display: grid; gap: 7px; }

  .recommendation-line {
    align-items: flex-start;
    flex-direction: column;
  }

  .metric-grid { grid-template-columns: 1fr; }

  .metric-grid div,
  .metric-grid div + div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

  .metric-grid div:last-child { border-bottom: 0; }
  .model-card { padding: 72px 0 64px; }

  .model-facts,
  .evaluation-grid { grid-template-columns: 1fr; }

  .model-facts > div,
  .model-facts > div + div,
  .evaluation-grid > div,
  .evaluation-grid > div + div {
    padding: 18px 0;
    border-left: 0;
  }

  .evaluation-heading,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .evaluation-heading p { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}