.demo-page { padding-bottom: 32px; }

.breadcrumb {
  display: flex;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.breadcrumb a { text-decoration: none; }

.demo-window { overflow: hidden; }

.demo-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 32px 36px;
  border-bottom: 1px solid var(--border);
}

.demo-header h1 { margin-bottom: 8px; font-size: 2.4rem; line-height: 1.15; }
.demo-header p:last-child { max-width: 680px; margin-bottom: 0; color: var(--muted); font-size: 1.05rem; }

.demo-layout { display: grid; grid-template-columns: minmax(360px, 0.9fr) minmax(440px, 1.1fr); }
.game-panel, .analysis-panel { padding: 28px 32px 32px; }
.game-panel { border-right: 1px solid var(--border); }

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.panel-label { margin-bottom: 2px; color: var(--muted); font-size: 0.75rem; }
.panel-heading h2 { margin-bottom: 0; font-size: 1.125rem; }

.side-selector {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 20px;
}

.side-selector button {
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: var(--page-bg);
  color: var(--btn-text);
  text-align: left;
  cursor: pointer;
}

.side-selector button[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.side-selector span { font: 600 1.25rem var(--font-mono); }
.side-selector small { color: var(--muted); }

.game-status {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: var(--page-bg);
  color: var(--text);
  font-size: 0.875rem;
  text-align: center;
}

.game-status[data-tone="thinking"] { border-color: var(--accent); color: var(--accent-text); }
.game-status[data-tone="won"] { border-color: var(--success); background: var(--success-soft); color: var(--success); }
.game-status[data-tone="lost"], .game-status[data-tone="draw"] { border-color: var(--warning); background: var(--warning-soft); color: var(--warning); }

.board {
  width: min(100%, 330px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0 auto 20px;
}

.board button {
  min-width: 0;
  border: 0;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: 600 clamp(2rem, 7vw, 3.25rem) var(--font-mono);
  cursor: pointer;
}

.board button:nth-child(3n) { border-right: 0; }
.board button:nth-child(n+7) { border-bottom: 0; }
.board button:not(:disabled):hover { background: var(--accent-soft); }
.board button[data-mark="X"] { color: var(--accent-text); }
.board button[data-mark="O"] { color: var(--warning); }
.board button[data-winning="true"] { background: var(--success-soft); color: var(--success); }
.board button:disabled { cursor: default; }

.game-note { max-width: 420px; margin: 0 auto; color: var(--muted); font-size: 0.8125rem; text-align: center; }

.analysis-state {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
}

.analysis-state[data-active="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-text); }

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 0 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  background: var(--page-bg);
}

.metrics div { min-width: 0; padding: 12px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.metrics div:nth-child(3n) { border-right: 0; }
.metrics div:nth-child(n+4) { border-bottom: 0; }
.metrics dt { margin-bottom: 4px; color: var(--muted); font-size: 0.6875rem; }
.metrics dd { overflow: hidden; margin: 0; color: var(--text); font: 600 0.875rem var(--font-mono); text-overflow: ellipsis; white-space: nowrap; }

.candidate-section { margin-bottom: 20px; }
.candidate-section__heading { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 8px; }
.candidate-section h3 { margin-bottom: 0; font-size: 0.875rem; }
.candidate-section__heading span { color: var(--muted); font-size: 0.75rem; }

.candidate-list { overflow-y: auto; min-height: 124px; max-height: 180px; border: 1px solid var(--border); border-radius: var(--radius-button); background: var(--page-bg); }
.empty-state { margin: 0; padding: 20px; color: var(--muted); font-size: 0.8125rem; text-align: center; }

.candidate-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.8125rem;
}

.candidate-row:last-child { border-bottom: 0; }
.candidate-row[data-selected="true"] { background: var(--accent-soft); }
.candidate-row__move { color: var(--text); font-family: var(--font-mono); }
.candidate-row__bar { height: 4px; overflow: hidden; border-radius: var(--radius-pill); background: var(--surface-raised); }
.candidate-row__bar span { display: block; height: 100%; background: var(--muted); }
.candidate-row[data-score="1"] .candidate-row__bar span { width: 100%; background: var(--success); }
.candidate-row[data-score="0"] .candidate-row__bar span { width: 55%; background: var(--warning); }
.candidate-row[data-score="-1"] .candidate-row__bar span { width: 18%; background: var(--danger); }
.candidate-row__result { color: var(--muted); font-weight: 600; }
.candidate-row[data-selected="true"] .candidate-row__result { color: var(--accent-text); }

.algorithm-note { padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-panel); background: var(--accent-soft); }
.algorithm-note strong { display: block; margin-bottom: 4px; color: var(--accent-text); font-size: 0.8125rem; }
.algorithm-note p { margin: 0; color: var(--btn-text); font-size: 0.8125rem; line-height: 1.55; }

.project-note {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 32px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.project-note h2 { margin-bottom: 8px; font-size: 1.35rem; }
.project-note p:last-child { max-width: 720px; margin-bottom: 0; color: var(--muted); line-height: 1.65; }
.project-note__actions { flex: 0 0 auto; display: flex; flex-wrap: wrap; gap: 8px; }

@media (max-width: 1000px) {
  .demo-layout { grid-template-columns: 1fr; }
  .game-panel { border-right: 0; border-bottom: 1px solid var(--border); }
}

@media (max-width: 768px) {
  .demo-header { padding: 24px; }
  .demo-header h1 { font-size: 1.75rem; }
  .game-panel, .analysis-panel { padding: 24px; }
  .project-note { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 600px) {
  .demo-header { flex-direction: column; padding: 20px 16px; }
  .game-panel, .analysis-panel { padding: 20px 16px; }
  .side-selector { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metrics div:nth-child(3n) { border-right: 1px solid var(--border); }
  .metrics div:nth-child(2n) { border-right: 0; }
  .metrics div:nth-child(n+4) { border-bottom: 1px solid var(--border); }
  .metrics div:nth-child(n+5) { border-bottom: 0; }
  .candidate-section__heading { flex-direction: column; gap: 2px; }
  .project-note__actions, .project-note__actions .button { width: 100%; }
}