:root {
  --navy: #071a3d;
  --navy-soft: #102b5e;
  --sky: #55bde8;
  --red: #e63832;
  --gold: #f3bd43;
  --paper: #f7fbff;
  --ink: #071a3d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--navy);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.7;
}

.site-header {
  width: min(100% - 28px, 720px);
  margin: 0 auto;
  padding: 14px 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #b9d7ee;
  font-size: 10px;
  letter-spacing: .15em;
}

.site-label, .fiction-badge { margin: 0; }

.fiction-badge {
  padding: 4px 10px;
  border: 1px solid rgba(243, 189, 67, .8);
  border-radius: 999px;
  color: #fff;
  background: rgba(230, 56, 50, .85);
  font-weight: 700;
  letter-spacing: .08em;
}

main { overflow: hidden; }

.hero, .image-section {
  width: min(100%, 720px);
  margin: 0 auto;
  position: relative;
}

.hero img, .image-section img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-actions {
  padding: 18px 20px 28px;
  display: grid;
  gap: 10px;
  background: linear-gradient(180deg, #0a2450, #071a3d);
}

button {
  border: 0;
  font: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.primary-button {
  min-height: 54px;
  padding: 12px 20px;
  border: 2px solid #fff;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--red), #b91f37);
  box-shadow: 0 6px 0 #7d1830, 0 10px 20px rgba(0, 0, 0, .28);
  font-weight: 800;
  letter-spacing: .04em;
  transition: transform .18s ease, filter .18s ease, box-shadow .18s ease;
}

.primary-button:hover, .primary-button:focus-visible {
  filter: brightness(1.12);
  transform: translateY(-2px);
  box-shadow: 0 8px 0 #7d1830, 0 12px 22px rgba(0, 0, 0, .32);
}

.primary-button:active { transform: translateY(3px); box-shadow: 0 3px 0 #7d1830; }

.text-button, .section-link {
  color: #dceeff;
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.text-button { padding: 6px; font-size: 13px; }

.image-section { padding-top: 22px; background: var(--navy); }

.section-link {
  display: block;
  width: calc(100% - 40px);
  margin: 14px auto 26px;
  padding: 13px 16px;
  border: 1px solid rgba(85, 189, 232, .65);
  border-radius: 10px;
  text-decoration: none;
  background: var(--navy-soft);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.section-link:hover, .section-link:focus-visible {
  color: var(--navy);
  background: var(--sky);
  transform: translateY(-2px);
}

.notice-section { padding-bottom: 12px; }

.site-footer {
  padding: 26px 20px 36px;
  color: #dceeff;
  background: #04122d;
  text-align: center;
  font-size: 11px;
}

.site-footer p { margin: 4px 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 721px) {
  body { padding: 0 20px; }
  .hero, .image-section { box-shadow: 0 0 34px rgba(0, 0, 0, .3); }
  .hero-actions { padding-left: 80px; padding-right: 80px; }
}