@import url("https://fonts.googleapis.com/css2?family=DotGothic16&display=swap");

:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #666666;
  --line: #e2e2e2;
  --line-open: #1d70f5;
  --panel: #ffffff;
  --panel-open: #f7fbff;
  --blue: #1d70f5;
  --warn: #a16207;
  --warn-bg: #fff8e6;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

.page {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.hero {
  margin-bottom: 36px;
}

.game-link {
  display: inline-block;
  margin-bottom: 18px;
  padding: 9px 14px;
  border: 1px solid var(--blue);
  border-radius: 4px;
  color: var(--blue);
  font-family:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.92rem;
  line-height: 1;
  text-decoration: none;
}

.game-link:hover {
  background: var(--panel-open);
}

.game-link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 0.75rem;
}

h1 {
  margin: 0;
  color: var(--text);
  font-family: "DotGothic16", ui-monospace, "Courier New", monospace;
  font-size: clamp(2.1rem, 9vw, 4.2rem);
  line-height: 1.15;
  font-weight: 400;
}

.notice {
  max-width: 32rem;
  margin: 22px 0 0;
  color: var(--muted);
  font-family:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.8;
}

.hint-list {
  display: grid;
  gap: 12px;
}

.hint-card {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
  overflow: hidden;
}

.hint-card[open] {
  border-color: var(--line-open);
  background: var(--panel-open);
}

summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  min-height: 68px;
  padding: 16px;
  cursor: pointer;
  list-style: none;
  touch-action: manipulation;
}

summary::-webkit-details-marker {
  display: none;
}

summary:hover {
  background: #f7f7f7;
}

summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -4px;
}

.hint-number {
  color: var(--blue);
  font-size: 0.95rem;
}

.summary-text {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.summary-kicker {
  color: var(--muted);
  font-size: 0.72rem;
}

.summary-title {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.4;
}

.arrow {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.hint-card[open] .arrow {
  transform: rotate(225deg);
}

.hint-body {
  margin: 0 16px 18px;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.hint-body h2 {
  margin: 0 0 14px;
  color: var(--text);
  font-size: clamp(1.05rem, 3.7vw, 1.25rem);
  line-height: 1.6;
}

.hint-body p {
  margin: 0;
  color: #222222;
  font-family:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.9;
}

.hint-body p + p {
  margin-top: 10px;
}

.final-hint {
  border-color: #f0c45c;
  background: var(--warn-bg);
}

.final-hint[open] {
  border-color: var(--warn);
}

.final-hint .hint-number,
.final-hint .summary-kicker,
.final-hint .summary-title {
  color: var(--warn);
}

.final-hint .arrow {
  border-color: var(--warn);
}

.final-hint .hint-body {
  border-top-color: #f0d995;
}

@media (max-width: 520px) {
  .page {
    padding: 36px 14px 48px;
  }

  .hero {
    margin-bottom: 28px;
  }

  summary {
    gap: 12px;
    min-height: 64px;
    padding: 15px 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arrow {
    transition: none;
  }
}