:root {
  --ink: #000;
  --muted: #555;
  --line: #bdbdbd;
  --soft: #f0f0f0;
  --blue: #e7f3fc;
  --gutter: 48px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Helvetica Neue", Helvetica, Arial, "Noto Sans JP", system-ui, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 2px solid #007aff; outline-offset: 4px; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(34px, 5.5vw, 56px); font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; text-wrap: balance; }
h2 { margin-bottom: 16px; font-size: 30px; font-weight: 700; line-height: 1.4; }
h3 { margin-bottom: 16px; font-size: 22px; font-weight: 700; line-height: 1.45; }
p { margin-bottom: 16px; }
strong { font-weight: 700; }
.site-header, main, footer { max-width: 1040px; margin-inline: auto; padding-inline: var(--gutter); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 76px; padding-block: 24px; border-bottom: 2px solid var(--ink); }
.brand-mark { font-size: 11px; font-weight: 700; letter-spacing: 0.02em; text-decoration: none; white-space: nowrap; }
.guide-nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: 12px; }
.guide-nav a { text-decoration: none; color: var(--muted); }
.guide-nav a[aria-current="page"] { color: var(--ink); font-weight: 700; text-decoration: underline; }
.hero { padding: 48px 0 40px; }
.eyebrow, .section-label { margin: 0 0 16px; font-size: 12px; line-height: 1.5; font-weight: 700; letter-spacing: 0.02em; }
.phase-label { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin: 0 0 20px; font-size: 16px; font-weight: 700; line-height: 1.5; }
.phase-badge { display: inline-block; padding: 7px 14px; color: #fff; background: #000; font-size: 18px; font-weight: 700; line-height: 1.5; }
.phase-audience { font-size: 16px; }
.hero-lead { margin: 20px 0 0; max-width: 800px; }
.notice, .important, .account-note, .music-guide-note, .answer-card, .warning { display: flex; gap: 12px; padding: 20px; margin-top: 24px; background: var(--soft); }
.important, .music-guide-note, .answer-card { background: var(--blue); }
.notice p, .important p, .account-note p, .music-guide-note p, .warning p { margin: 0; font-size: 14px; }
.notice-mark, .check-mark, .account-note-mark, .music-guide-note-mark, .answer-mark, .warning-mark { flex: 0 0 20px; font-weight: 700; text-align: center; }
.important strong, .account-note strong, .music-guide-note strong { display: block; margin-bottom: 4px; }
.account-note small { display: block; margin-top: 8px; color: var(--muted); font-size: 12px; }
.music-guide-note a { display: inline-block; margin-top: 12px; }
.music-hero-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 20px; padding: 24px 0; border-block: 1px solid var(--line); }
.music-hero-icon { display: none; }
.music-hero-card strong { display: block; margin-bottom: 4px; font-size: 18px; }
.music-hero-card p { margin: 0; color: var(--muted); font-size: 14px; }
.music-hero-card a, .official-links a, .return-card a, .music-guide-note a {
  display: inline-flex; align-items: center; justify-content: center; padding: 12px 18px;
  color: #fff; background: #000; font-size: 14px; font-weight: 600; line-height: 1.5; text-decoration: none;
}
.music-hero-card a:hover, .official-links a:hover, .return-card a:hover, .music-guide-note a:hover { background: #292929; }
.route-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 32px; border-block: 1px solid var(--line); }
.route-nav a { display: grid; align-content: start; gap: 10px; padding: 24px; text-decoration: none; }
.route-nav a:first-child { padding-left: 0; }
.route-nav a + a { border-left: 1px solid var(--line); }
.route-nav a:hover { background: var(--soft); }
.route-number { display: grid; width: 40px; height: 40px; place-items: center; color: #fff; background: #000; font-size: 22px; font-weight: 700; line-height: 1; }
.route-nav strong { font-size: 20px; line-height: 1.5; }
.route-nav small { color: var(--muted); font-size: 14px; }
.support-links { display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 20px 0 32px; font-size: 14px; }
.phase, .guide-section, .explain-section, .faq-section, .support-section { padding: 56px 0; border-top: 1px solid var(--line); scroll-margin-top: 24px; }
.phase-head h2 { font-size: 36px; }
.phase-head, .section-heading, .support-heading { margin-bottom: 28px; }
.phase-head > p:last-child, .section-heading > p:last-child, .support-heading > p:last-child { margin-bottom: 0; }
.phase-head .account-note, .phase-head .important, .phase-head .music-guide-note { margin-bottom: 0; }
.steps, .story-steps { list-style: none; margin: 0; padding: 0; }
.guide-guide .steps { display: grid; gap: 32px; }
.shot-card { display: grid; grid-template-columns: minmax(240px, 330px) minmax(0, 1fr); border-block: 1px solid var(--line); }
.shot-frame { display: grid; padding: 20px; background: var(--soft); place-items: center; }
.shot-stage { position: relative; width: min(100%, 290px); aspect-ratio: 828 / 1792; overflow: hidden; background: #fff; }
.shot-stage img { width: 100%; height: 100%; object-fit: cover; }
.privacy-pending .shot-frame img { visibility: hidden; }
.guide-guide .focus-box, .privacy-mask { position: absolute; left: calc(var(--x) * 1%); top: calc(var(--y) * 1%); width: calc(var(--w) * 1%); height: calc(var(--h) * 1%); pointer-events: none; }
.guide-guide .focus-box { z-index: 3; border: 3px solid #ff5a36; border-radius: 5px; background: rgba(255, 90, 54, 0.08); box-shadow: 0 0 0 2px #fff; }
.privacy-mask { z-index: 2; border-radius: 7px; background: rgba(225,225,225,0.34); -webkit-backdrop-filter: blur(13px); backdrop-filter: blur(13px); box-shadow: inset 0 0 12px rgba(255,255,255,0.35); }
.shot-copy { display: flex; flex-direction: column; justify-content: center; padding: 32px; }
.step-number { display: inline-flex; align-items: center; justify-content: center; align-self: flex-start; width: fit-content; min-width: 56px; margin-bottom: 20px; padding: 6px 12px; color: #fff; background: #000; font-size: 18px; font-weight: 700; line-height: 1.5; }
.shot-copy p { margin: 0; }
.shot-copy .hint { margin-top: 20px; padding: 16px; background: var(--blue); font-size: 14px; }
.finish { margin-top: 24px; padding: 24px; background: var(--blue); }
.finish strong { display: block; margin-bottom: 8px; font-size: 18px; }
.finish p { margin: 0; }
.support-block + .support-block { margin-top: 40px; padding-top: 40px; border-top: 1px solid var(--line); }
.story-steps { display: grid; gap: 20px; }
.story-steps li { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 6px 16px; }
.story-steps li > span { display: grid; grid-row: span 2; place-items: center; width: 36px; height: 36px; color: #fff; background: #000; font-size: 18px; font-weight: 700; line-height: 1; }
.story-steps strong { font-size: 18px; }
.story-steps p { grid-column: 2; margin: 0; }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 20px 36px 20px 0; cursor: pointer; font-weight: 700; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { position: absolute; top: 18px; right: 4px; content: "+"; font-size: 22px; font-weight: 400; }
details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 36px 20px 0; color: var(--muted); font-size: 14px; }
.guide-music .answer-card { margin: 0 0 32px; }
.visual-card { display: grid; grid-template-columns: minmax(0, 390px) minmax(0, 1fr); border-block: 1px solid var(--line); }
.screen-wrap { padding: 20px; background: var(--soft); }
.screen-stage { position: relative; width: 100%; overflow: hidden; background: #15191c; }
.screen-stage img { width: 100%; }
.guide-music .focus-box { position: absolute; left: 75.4%; top: 31.55%; width: 21.1%; height: 7.7%; border: 4px solid #ffd35a; border-radius: 8px; box-shadow: 0 0 0 2px rgba(0,0,0,0.4); pointer-events: none; }
.focus-label { position: absolute; top: 27.7%; right: 3.5%; padding: 3px 6px; color: #000; background: #ffd35a; font-size: 11px; font-weight: 700; line-height: 1.3; }
.guide-music .steps { display: grid; align-content: center; gap: 32px; padding: 28px; }
.guide-music .steps li { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 8px 16px; }
.guide-music .step-number { grid-row: span 2; width: 40px; height: 40px; min-width: 40px; margin: 0; padding: 0; font-size: 22px; line-height: 1; }
.guide-music .steps strong { font-size: 20px; line-height: 1.5; }
.guide-music .steps p { margin: 0; font-size: 14px; color: var(--muted); }
.explain-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 32px; }
.explain-card p { margin: 0; }
.rf-badge { display: inline-block; margin-right: 6px; padding: 0 5px; color: #000; background: var(--soft); font-size: 14px; vertical-align: 1px; }
.official { margin-top: 28px; padding: 24px; background: var(--soft); }
.official > strong { display: block; margin-bottom: 8px; font-size: 18px; }
.official p { font-size: 14px; }
.official-links { display: flex; flex-wrap: wrap; gap: 12px; }
.return-card { padding: 40px 0; border-top: 1px solid var(--line); }
.return-card p { margin-bottom: 20px; }
footer { padding-block: 32px 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
footer p { margin-bottom: 8px; }

@media (max-width: 700px) {
  :root { --gutter: 22px; }
  .site-header { padding-block: 18px; min-height: 64px; }
  .guide-nav { gap: 12px; font-size: 11px; }
  .hero { padding: 36px 0; }
  h2 { font-size: 26px; }
  h3 { font-size: 21px; }
  .phase-head h2 { font-size: 28px; }
  .phase-badge { font-size: 17px; }
  .phase-audience { font-size: 14px; }
  .hero-lead br { display: none; }
  .notice, .important, .account-note, .music-guide-note, .answer-card, .warning, .finish, .official { padding: 16px; }
  .music-hero-card { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .music-hero-card a { justify-self: start; }
  .route-nav { grid-template-columns: minmax(0, 1fr); }
  .route-nav a, .route-nav a:first-child { padding: 16px 0; }
  .route-nav a + a { border-left: 0; border-top: 1px solid var(--line); }
  .support-links { display: grid; gap: 12px; }
  .phase, .guide-section, .explain-section, .faq-section, .support-section { padding: 40px 0; }
  .shot-card, .visual-card, .explain-grid { grid-template-columns: minmax(0, 1fr); }
  .shot-copy { order: -1; padding: 24px 0; }
  .shot-frame { padding: 16px; }
  .guide-music .steps { padding: 24px 0; order: -1; }
  .screen-wrap { padding: 16px; }
  .official-links { display: grid; }
  .official-links a { text-align: center; }
  .return-card { padding: 32px 0; }
  footer { padding-block: 24px 32px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }