:root {
  --ink: #0a1c2b;          /* タイトル画面の紺 */
  --pitch: #0d3f2e;        /* ピッチの緑 */
  --green: #34c17a;        /* アクセント */
  --green-dim: #1c7d52;
  --text: #eef4f0;
  --muted: #97b0a6;
  --card: rgba(255, 255, 255, 0.055);
  --line: rgba(255, 255, 255, 0.11);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  color: var(--text);
  background: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 50% -8%, rgba(52, 193, 122, 0.20), transparent 62%),
    linear-gradient(180deg, #0a1c2b 0%, #0b2433 42%, #0c3728 100%);
  /* background-attachment: fixed は iOS Safari で描画が壊れるので使わない。
     代わりにページ全体の高さいっぱいに1枚だけ敷く。 */
  background-repeat: no-repeat;
  background-size: 100% 100%, 100% 100%;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }

/* header */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 28, 43, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav img { height: 30px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--green); }

/* 言語切り替え（日本語 / English） */
.lang {
  display: flex; flex: none; margin-left: 2px;
  border: 1px solid var(--line); border-radius: 999px; overflow: hidden;
}
.lang a {
  padding: 5px 11px; font-size: 11.5px; font-weight: 700;
  letter-spacing: .04em; color: var(--muted); line-height: 1.2;
}
.lang a.on { background: var(--green); color: #06231a; }
.lang a:not(.on):hover { color: var(--text); }

/* hero */
.hero {
  max-width: 1080px; margin: 0 auto; padding: 60px 20px 24px;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 48px;
}
.hero-copy { text-align: center; max-width: 470px; }
.hero-copy .logo { width: min(400px, 84vw); margin: 0 auto 26px; }
.hero-copy h1 { font-size: clamp(20px, 4.6vw, 27px); font-weight: 800; line-height: 1.6; }
.hero-copy .rule { width: 88px; height: 4px; background: var(--green); margin: 20px auto; border-radius: 2px; }
.hero-copy .sub { color: var(--muted); font-size: 14px; line-height: 1.9; }
.badge {
  display: inline-block; margin-top: 24px; padding: 11px 28px;
  background: var(--green); color: #06231a; border: 2px solid var(--green);
  border-radius: 999px; font-size: 13px; font-weight: 800; letter-spacing: 0.06em;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.badge:hover { background: transparent; color: var(--green); transform: translateY(-2px); }
.badge.soon {
  background: transparent; color: var(--muted); border-color: var(--line);
  cursor: default;
}
.badge.soon:hover { transform: none; background: transparent; color: var(--muted); }
.hero-pitch { width: min(360px, 74vw); margin: 30px auto 0; opacity: .96; }

/* phone frame */
.phone {
  width: min(280px, 74vw);
  border-radius: 34px; overflow: hidden;
  box-shadow: 0 26px 64px rgba(0, 0, 0, 0.50);
  background: #000;
  flex: none;
}
.phone.large { width: min(318px, 80vw); }
.phone video { width: 100%; }

/* sections */
section { padding: 62px 20px; }
.inner { max-width: 1080px; margin: 0 auto; }
.sec-title { text-align: center; font-size: clamp(21px, 4vw, 28px); font-weight: 800; }
.sec-title small {
  display: block; color: var(--green); font-size: 12px; letter-spacing: 0.28em;
  margin-bottom: 10px; font-weight: 700;
}
.sec-rule { width: 64px; height: 4px; background: var(--green); margin: 18px auto 0; border-radius: 2px; }
.sec-lead { text-align: center; color: var(--muted); font-size: 13.5px; line-height: 1.9; margin-top: 22px; }

/* features */
.features {
  margin-top: 44px; display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.feature {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 20px; padding: 30px 24px; text-align: center;
}
.feature .num { font-size: 40px; font-weight: 800; color: var(--green); line-height: 1; }
.feature .num small { font-size: 17px; color: var(--text); margin-left: 2px; }
.feature h3 { font-size: 16px; margin-top: 12px; }
.feature p { font-size: 13px; color: var(--muted); margin-top: 8px; line-height: 1.85; }

/* video gallery */
.gallery {
  margin-top: 46px; display: flex; flex-wrap: wrap; justify-content: center;
  gap: 40px 34px;
}
.movie { text-align: center; }
.movie figcaption { margin-top: 14px; font-size: 14px; font-weight: 700; }
.movie figcaption span { display: block; margin-top: 4px; font-size: 12px; font-weight: 500; color: var(--muted); }

/* screenshots */
.shots {
  margin-top: 44px; display: flex; gap: 18px; overflow-x: auto;
  padding: 10px 4px 26px; -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
}
.shots img {
  width: 200px; border-radius: 18px; flex: none; scroll-snap-align: center;
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.45);
}
.shots-cta { text-align: center; }

/* spec table */
.spec {
  margin-top: 40px; width: 100%; border-collapse: collapse; font-size: 13.5px;
}
.spec th, .spec td {
  border-bottom: 1px solid var(--line);
  padding: 14px 10px; text-align: left; line-height: 1.85; vertical-align: top;
}
.spec th { width: 30%; font-weight: 700; white-space: nowrap; }
.spec td { color: var(--muted); word-break: break-word; overflow-wrap: anywhere; }

/* contact cta */
.cta { text-align: center; }
.btn {
  display: inline-block; margin-top: 26px; padding: 16px 44px;
  background: var(--green); color: #06231a; border-radius: 999px;
  font-weight: 800; font-size: 15px; border: 2px solid var(--green);
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn:hover { background: transparent; color: var(--green); transform: translateY(-2px); }

/* footer */
footer {
  border-top: 1px solid var(--line);
  padding: 34px 20px 46px; text-align: center; font-size: 12px; color: var(--muted);
}
.foot-links { display: flex; gap: 20px; justify-content: center; margin-bottom: 14px; font-weight: 600; flex-wrap: wrap; }
.foot-links a:hover { color: var(--green); }

/* text pages (privacy / terms / contact) */
.doc { max-width: 760px; margin: 0 auto; padding: 56px 20px 80px; }
.doc h1 { font-size: 24px; text-align: center; }
.doc .updated { text-align: center; color: var(--muted); font-size: 12px; margin: 12px 0 40px; }
.doc h2 { font-size: 17px; margin: 36px 0 12px; border-left: 4px solid var(--green); padding-left: 12px; }
.doc p, .doc li { font-size: 14px; line-height: 2.0; color: #d3e1da; }
.doc ul { padding-left: 22px; }
.doc a:not(.btn) { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }
.doc .card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 20px; padding: 40px 28px; text-align: center; margin-top: 36px;
}
.doc .mail { font-size: 18px; font-weight: 700; margin-top: 8px; word-break: break-all; }

@media (max-width: 560px) {
  .spec, .spec tbody, .spec tr, .spec th, .spec td { display: block; width: auto; }
  .spec tr { border-bottom: 1px solid var(--line); padding: 12px 0; }
  .spec th, .spec td { border: 0; padding: 0; }
  .spec th { font-size: 11px; color: var(--muted); letter-spacing: .04em; }
  .spec td { margin-top: 4px; }
}
@media (max-width: 520px) {
  .nav { padding: 10px 14px; }
  .nav img { height: 24px; }
  .nav-links { gap: 13px; font-size: 12.5px; }
  .lang a { padding: 4px 9px; font-size: 11px; }
  /* 狭い画面ではロゴと言語切り替えを優先し、章内リンクは落とす
     （英語は語が長く、320px幅でナビがロゴに重なるため） */
  .nav-links a[href*="#"] { display: none; }
}
@media (max-width: 400px) {
  .nav { padding: 9px 12px; }
  .nav img { height: 21px; }
  .nav-links { gap: 9px; font-size: 12px; }
  .lang a { padding: 4px 8px; font-size: 10.5px; }
}

/* 開発元クレジット（n11） */
.dev-credit {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  margin: 0 0 18px;
}
.dev-credit-label {
  font-size: 10px; font-weight: 600; letter-spacing: .18em; color: var(--muted);
}
.dev-credit-link {
  /* サイトが暗いので、ロゴは白い台紙にのせて視認性を確保する */
  display: inline-flex; padding: 9px 16px; border-radius: 14px;
  background: #fff; box-shadow: 0 6px 18px rgba(0, 0, 0, .28);
  transition: transform .15s ease, box-shadow .15s ease;
}
.dev-credit-link img { display: block; height: 24px; width: auto; }
.dev-credit-link:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0, 0, 0, .36); }