/* ===== reset / base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { max-width: 100%; height: auto; display: block; }
/* display 指定を持つ要素でも hidden 属性を確実に効かせる */
[hidden] { display: none !important; }

:root {
  color-scheme: dark;
  --bg: #0b0f1e;
  --bg-2: #101731;
  --card: #141c34;
  --card-2: #18213c;
  --line: #2b365c;
  --fg: #e9eefa;
  --fg-muted: #aeb9d4;
  --pink: #ff3fb4;
  --pink-2: #ff86d3;
  --cyan: #3fe0ff;
  --yellow: #ffd45c;
  --maxw: 720px;
  --radius: 14px;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  font-feature-settings: "palt" 1;
  overflow-x: hidden;
}

/* 宇宙（星）— 画像素材を使わずCSSのみ */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--bg);
  background-image:
    radial-gradient(1.6px 1.6px at 12% 18%, rgba(255,255,255,.85) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 27% 62%, rgba(255,255,255,.65) 50%, transparent 51%),
    radial-gradient(1.8px 1.8px at 41% 11%, rgba(255,255,255,.75) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 55% 44%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 68% 76%, rgba(255,255,255,.8) 50%, transparent 51%),
    radial-gradient(1.3px 1.3px at 79% 29%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1.7px 1.7px at 88% 58%, rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 6% 82%, rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 34% 91%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 62% 6%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(900px 520px at 78% -10%, rgba(255,63,180,.16), transparent 70%),
    radial-gradient(760px 480px at 8% 4%, rgba(63,224,255,.13), transparent 70%);
  background-size: 520px 520px, 520px 520px, 520px 520px, 520px 520px, 520px 520px,
                   520px 520px, 520px 520px, 520px 520px, 520px 520px, 520px 520px,
                   100% 100%, 100% 100%;
}

/* ===== layout ===== */
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
main { display: block; }
section { border-top: 1px solid rgba(43,54,92,.6); }
/* .wrap の padding より詳細度を高くして縦の余白を確実に効かせる */
section.wrap { padding: 56px 20px; }
section:first-of-type { border-top: 0; }

/* ===== typography ===== */
h1, h2, h3 { line-height: 1.35; font-weight: 900; }
h2 {
  font-size: clamp(22px, 5.2vw, 30px);
  color: var(--pink);
  letter-spacing: .01em;
  text-shadow: 0 0 22px rgba(255,63,180,.28);
  margin-bottom: 8px;
}
h3 {
  font-size: clamp(17px, 4.2vw, 20px);
  color: var(--fg);
  margin: 28px 0 6px;
}
.sec-en {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 6px;
}
p + p, p + ul, p + ol, p + .box, ul + p, .box + p, p + figure, figure + p { margin-top: 1.1em; }
strong { color: #fff; font-weight: 700; }
.muted { color: var(--fg-muted); }
.small { font-size: 14px; }
a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: #fff; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--pink); color: #fff; padding: 12px 18px; z-index: 50; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ===== hero ===== */
.hero { position: relative; overflow: hidden; padding: 64px 0 48px; border-top: 0; }
/* 装飾の速度線は本文の可読性を優先し、中央（テキスト列）ではマスクで消す */
.hero__lines {
  position: absolute; inset: 0; z-index: -1; opacity: .5;
  -webkit-mask-image: linear-gradient(90deg, #000 0%, #000 12%, transparent 36%, transparent 64%, #000 88%, #000 100%);
  mask-image: linear-gradient(90deg, #000 0%, #000 12%, transparent 36%, transparent 64%, #000 88%, #000 100%);
}
.hero__lines span {
  position: absolute; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, transparent, currentColor);
}
.hero__lines span:nth-child(1) { top: 14%; left: -10%; width: 55%; color: var(--cyan); }
.hero__lines span:nth-child(2) { top: 26%; left: 20%; width: 70%; color: var(--pink); }
.hero__lines span:nth-child(3) { top: 44%; left: -5%; width: 40%; color: var(--yellow); }
.hero__lines span:nth-child(4) { top: 63%; left: 35%; width: 60%; color: var(--cyan); }
.hero__lines span:nth-child(5) { top: 78%; left: 5%; width: 48%; color: var(--pink); }
.hero__lines span:nth-child(6) { top: 90%; left: 45%; width: 45%; color: #8effc4; }

.eyebrow {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: .16em;
  color: var(--cyan);
  border: 1px solid rgba(63,224,255,.5);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 18px;
}
h1 {
  font-size: clamp(52px, 17vw, 104px);
  letter-spacing: .04em;
  color: #fff;
  text-shadow: 0 0 30px rgba(255,63,180,.55), 0 0 70px rgba(255,63,180,.25);
}
.reading {
  display: block;
  margin-top: 6px;
  font-size: clamp(14px, 3.6vw, 17px);
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--fg-muted);
}
.hero .lead {
  margin-top: 22px;
  font-size: clamp(17px, 4.4vw, 21px);
  line-height: 1.85;
  font-weight: 700;
  color: #fff;
  border-left: 4px solid var(--pink);
  padding: 4px 0 4px 16px;
}
.hero .sub { margin-top: 14px; color: var(--fg-muted); }

/* ===== 目次 ===== */
.toc.wrap { padding: 32px 20px 0; border-top: 0; }
.toc ul { display: flex; flex-wrap: wrap; gap: 8px; }
.toc a {
  display: inline-flex; align-items: center;
  min-height: 44px; padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20,28,52,.7);
  color: var(--fg);
  text-decoration: none;
  font-size: 14px; font-weight: 500;
}
.toc a:hover { border-color: var(--cyan); color: var(--cyan); }

/* ===== boxes ===== */
.box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.box--note { border-color: rgba(255,212,92,.45); background: rgba(255,212,92,.06); }
.box__title { font-weight: 700; color: #fff; margin-bottom: 6px; }
.stack > * + * { margin-top: 16px; }

.deflist { margin-top: 18px; }
.deflist > div {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  border-radius: 10px;
  padding: 16px 18px;
}
.deflist > div + div { margin-top: 12px; }
.deflist dt { font-weight: 700; color: var(--cyan); font-size: 14px; letter-spacing: .06em; }
.deflist dd { margin-top: 4px; }

.list li { position: relative; padding-left: 1.35em; }
.list li::before { content: "▸"; position: absolute; left: 0; color: var(--pink); }
.list li + li { margin-top: .6em; }

.ex li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
}
.ex li + li { margin-top: 10px; }
.ex .ex__label {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  color: #11040c; background: var(--cyan); border-radius: 4px; padding: 1px 8px; margin-right: 8px;
}
.ex .ex__label--fig { background: var(--pink); color: #fff; }
.ex .ex__note { display: block; color: var(--fg-muted); font-size: 14px; margin-top: 2px; }

/* ===== 図解（四角と矢印） ===== */
.flow { margin-top: 20px; }
.flow__row { display: flex; flex-wrap: wrap; align-items: stretch; gap: 8px; }
.flow__step {
  /* 最小合計幅 = 4×130 + 3×20（矢印）+ 6×8（gap）= 628px。.narrow の 720px に対し約92pxの余裕を確保 */
  flex: 1 1 130px;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  font-size: 14px;
  line-height: 1.7;
}
.flow__step b { display: block; color: var(--cyan); font-size: 12px; letter-spacing: .1em; margin-bottom: 4px; }
.flow__step--danger { border-color: rgba(255,63,180,.6); background: linear-gradient(180deg, rgba(255,63,180,.14), rgba(24,33,60,.9)); }
.flow__step--danger b { color: var(--pink-2); }
.flow__arrow {
  flex: 0 0 auto;
  align-self: center;
  color: var(--pink);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

/* ===== PV ===== */
.pv-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  background: linear-gradient(160deg, #131b33, #0a0e1c);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 18px;
}
.pv-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.pv-ph__title { font-weight: 900; color: #fff; font-size: clamp(16px, 4.4vw, 20px); }
.pv-ph__note { color: var(--fg-muted); font-size: 14px; margin-top: 6px; }
.pv-play {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 48px; padding: 12px 22px;
  border-radius: 999px; border: 0;
  background: var(--pink); color: #11040c;
  font-family: inherit; font-size: 15px; font-weight: 700;
  cursor: pointer;
}
.pv-play:hover { background: var(--pink-2); }


/* ===== CREATOR videos（§9・LP調） ===== */
.nome-catch {
  margin-top: 10px;
  margin-bottom: 8px;
  font-weight: 900;
  font-size: clamp(22px, 5.6vw, 34px);
  line-height: 1.5;
  color: #fff;
  letter-spacing: .02em;
  text-shadow: none;
}
.nome-catch__name {
  display: block;
  margin-top: 6px;
  background: linear-gradient(90deg, var(--cyan), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.vid-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.vid-card { margin: 0; }
.vid-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.vid-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.vid-thumb {
  display: block; width: 100%; height: 100%;
  padding: 0; border: 0; cursor: pointer; background: #000;
}
.vid-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .35s ease, opacity .35s ease;
  opacity: .92;
}
.vid-thumb:hover img, .vid-thumb:focus-visible img { transform: scale(1.04); opacity: 1; }
.vid-thumb::after {
  content: "▶";
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 58px; height: 58px;
  display: flex; align-items: center; justify-content: center;
  padding-left: 4px;
  border-radius: 999px;
  background: rgba(11, 15, 30, .82);
  border: 1px solid rgba(63, 224, 255, .65);
  color: var(--cyan);
  font-size: 20px;
  transition: background .25s ease, color .25s ease, transform .25s ease;
}
.vid-thumb:hover::after, .vid-thumb:focus-visible::after {
  background: rgba(255, 63, 180, .88);
  color: #fff;
  border-color: transparent;
  transform: translate(-50%, -50%) scale(1.08);
}
.vid-cap { margin-top: 10px; }
.vid-cap__label {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: .08em;
  color: var(--cyan);
  border: 1px solid rgba(63, 224, 255, .5);
  border-radius: 999px;
  padding: 2px 10px;
}
.vid-cap__title { display: block; margin-top: 6px; font-size: 13px; color: var(--fg-muted); line-height: 1.7; }
.vid-featured {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card), var(--bg-2));
  padding: 22px 18px;
}
.vid-featured__kicker { font-size: 12px; letter-spacing: .18em; font-weight: 700; color: var(--cyan); }
.vid-featured__title {
  margin: 6px 0 0;
  font-size: clamp(20px, 5vw, 28px);
  font-weight: 900;
  color: var(--pink);
  letter-spacing: .01em;
  text-shadow: 0 0 22px rgba(255, 63, 180, .28);
}
.vid-featured__num {
  display: block;
  margin-top: 4px;
  font-weight: 900;
  font-size: clamp(40px, 9vw, 64px);
  line-height: 1.1;
  letter-spacing: .02em;
  background: linear-gradient(90deg, var(--cyan), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.vid-featured__statlabel { display: block; font-size: 13px; color: var(--fg-muted); margin-top: 4px; }
.vid-featured .vid-card { margin-top: 16px; }

/* ===== FAQ ===== */
.faq h3 { color: var(--cyan); margin-top: 30px; }
.faq h3::before { content: "Q. "; color: var(--pink); }
.faq p.a::before { content: "A. "; font-weight: 700; color: var(--pink); }

/* ===== 出典 ===== */
.src li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
}
.src li + li { margin-top: 10px; }
.src .src__url {
  display: block;
  font-size: 12px;
  color: var(--fg-muted);
  word-break: break-all;
  line-height: 1.6;
  margin-top: 2px;
}

/* ===== links grid ===== */
.links { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; margin-top: 16px; }
.links a {
  display: flex; align-items: center;
  min-height: 48px; padding: 12px 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; color: var(--fg); font-weight: 500; font-size: 15px;
}
.links a:hover { border-color: var(--cyan); color: var(--cyan); }

/* ===== 上に戻る ===== */
.to-top {
  position: fixed;
  right: 18px; bottom: 18px;
  z-index: 40;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 999px;
  background: rgba(11, 15, 30, .85);
  border: 1px solid rgba(63, 224, 255, .5);
  color: var(--cyan);
  text-decoration: none;
  font-weight: 900;
  font-size: 18px;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover, .to-top:focus-visible { background: rgba(255, 63, 180, .88); color: #fff; border-color: transparent; }

/* ===== footer ===== */
footer {
  border-top: 1px solid var(--line);
  background: rgba(10,14,28,.7);
  padding: 40px 0 56px;
  font-size: 14px;
  color: var(--fg-muted);
}
footer p + p { margin-top: 10px; }
footer .copy { color: var(--fg); font-weight: 700; }

/* 図解は横並びの最小合計幅が628px。コンテナ幅（ビューポート−40px）がそれを下回る帯では
   途中で折り返して崩れるため、720px以下は縦並びに切り替える（横並びは実効幅660px以上でのみ使う） */
@media (max-width: 720px) {
  .flow__row { flex-direction: column; }
  .flow__step { flex: 0 0 auto; }
  .flow__arrow { transform: rotate(90deg); align-self: flex-start; margin-left: 22px; }
}
@media (max-width: 640px) {
  section.wrap { padding: 46px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
/* ===== 運営サービスのお知らせ（推しにゅ〜）=====
   文言の根拠: mgkinc.co.jp/3apps-release/（推しにゅ〜紹介文）・App Store id6794950639・oshinyu.com（キャッチコピー/iPhone配信中・Android準備中）
   ロゴ oshinyu-logo.png は oshinyu.com/img/logo.png の自サイト配信（外部リクエストなし設計を維持） */
.osn-sec { padding: 0 20px 48px; }
.osn {
  max-width: var(--maxw);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255,63,180,.10), rgba(63,224,255,.08)), var(--card);
  padding: 24px 26px;
}
.osn__label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 14px;
}
.osn__logo { width: 150px; }
.osn__logo img { width: 100%; height: auto; }
.osn__title { font-size: clamp(18px, 4vw, 22px); font-weight: 900; line-height: 1.45; margin-top: 12px; }
.osn__text { font-size: 14px; color: var(--fg-muted); margin-top: 8px; }
.osn__btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.osn__btn {
  display: inline-block;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.4;
  padding: 10px 18px;
  border-radius: 999px;
  text-decoration: none;
  background: var(--pink);
  color: #fff;
}
.osn__btn:hover { background: var(--pink-2); color: #fff; }
.osn__btn--ghost { background: transparent; border: 1px solid var(--cyan); color: var(--cyan); }
.osn__btn--ghost:hover { background: rgba(63,224,255,.12); color: var(--cyan); }
.osn--band { display: flex; align-items: center; gap: 20px; padding: 20px 24px; }
.osn--band .osn__logo { width: 116px; flex: 0 0 auto; }
.osn--band .osn__body { flex: 1; min-width: 0; }
.osn--band .osn__title { font-size: clamp(16px, 3.6vw, 19px); margin-top: 0; }
.osn--band .osn__text { margin-top: 4px; }
.osn--band .osn__btns { margin-top: 12px; }
@media (max-width: 560px) {
  .osn--band { flex-direction: column; align-items: flex-start; gap: 14px; }
}