/* 下層ページ（お問い合わせ・送信完了）で使う共通スタイル。トップページと同じ見た目にそろえる */
:root {
  --bg: #f6f3ec;
  --bg-soft: #efeae0;
  --surface: #ffffff;
  --ink: #0d1a2b;
  --ink-2: #3b4656;
  --muted: #6b7380;
  --line: rgba(13, 26, 43, 0.09);

  --blue-900: #12307a;
  --blue-700: #1d58d0;
  --blue-500: #2f86e6;
  --cyan-400: #3cc4e4;
  --aqua-200: #9de4ec;
  --peach: #f4d9c6;

  --grad-brand: linear-gradient(120deg, var(--blue-700) 0%, var(--blue-500) 35%, var(--cyan-400) 70%, var(--aqua-200) 100%);

  --radius-xl: 40px;
  --radius-lg: 28px;
  --radius-md: 20px;
  --max: 1200px;
  --gutter: clamp(16px, 4vw, 40px);

  --font-en: "Inter Tight", "Noto Sans JP", system-ui, sans-serif;
  --font-jp: "Noto Sans JP", "Inter Tight", system-ui, sans-serif;
  --font-serif: "Instrument Serif", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* 日英切り替え */
html[data-lang="ja"] [data-l="en"],
html[data-lang="en"] [data-l="ja"] { display: none !important; }
html[data-lang="en"] body { font-family: var(--font-en); }

.grad-text { background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* Nav */
.nav { position: fixed; inset: 16px 0 auto; z-index: 50; padding: 0 var(--gutter); }
.nav__inner {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 30px rgba(13, 26, 43, 0.06);
  border-radius: 999px;
  padding: 8px 8px 8px 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font: 700 20px/1 var(--font-en); letter-spacing: 0.02em; }
.brand img { height: 30px; width: auto; }
.nav__links { display: flex; gap: 28px; font: 500 14px/1 var(--font-en); color: var(--ink-2); }
.nav__links a { transition: color .2s; }
.nav__links a:hover { color: var(--blue-700); }
.nav__right { display: flex; align-items: center; gap: 8px; }
.lang { display: inline-flex; background: var(--bg-soft); border-radius: 999px; padding: 3px; font: 600 12px/1 var(--font-en); }
.lang button { border: 0; background: transparent; color: var(--muted); cursor: pointer; padding: 8px 10px; border-radius: 999px; font: inherit; }
html[data-lang="ja"] .lang [data-set="ja"],
html[data-lang="en"] .lang [data-set="en"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.menu-btn { display: none; border: 0; background: var(--ink); color: #fff; width: 40px; height: 40px; border-radius: 999px; cursor: pointer; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font: 600 15px/1 var(--font-jp);
  padding: 16px 24px; border-radius: 999px; border: 0; cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .25s, opacity .25s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { box-shadow: 0 10px 24px rgba(13, 26, 43, .25); }
.btn--ghost { background: rgba(255,255,255,.7); color: var(--ink); border: 1px solid var(--line); backdrop-filter: blur(8px); }
.btn--ghost:hover { background: #fff; }
.btn--sm { padding: 12px 18px; font-size: 13px; }
.btn .arrow { width: 18px; height: 18px; border-radius: 999px; background: var(--grad-brand); display: grid; place-items: center; flex-shrink: 0; }
.btn .arrow svg { width: 10px; height: 10px; }

/* 光のグラデーション */
.glow { position: absolute; border-radius: 50%; filter: blur(70px); pointer-events: none; will-change: transform; }
.glow--cyan { background: radial-gradient(circle, var(--cyan-400), transparent 65%); }
.glow--blue { background: radial-gradient(circle, var(--blue-700), transparent 65%); }
.glow--aqua { background: radial-gradient(circle, var(--aqua-200), transparent 65%); }
.glow--peach { background: radial-gradient(circle, var(--peach), transparent 65%); }
.drift-a { animation: driftA 18s ease-in-out infinite alternate; }
.drift-b { animation: driftB 22s ease-in-out infinite alternate; }
@keyframes driftA { to { transform: translate(6vw, -4vw) scale(1.1); } }
@keyframes driftB { to { transform: translate(-5vw, 3vw) scale(.9); } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 13px/1 var(--font-en); letter-spacing: .12em; text-transform: uppercase; color: var(--blue-700);
  margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 99px; background: var(--grad-brand); }

/* Footer */
footer { padding: 72px 0 40px; }
.foot { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.foot h5 { font: 600 12px/1 var(--font-en); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 0 0 16px; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: 14px; }
.foot ul a:hover { color: var(--blue-700); }
.foot p { color: var(--muted); font-size: 13px; margin: 16px 0 0; max-width: 300px; }
.foot-bottom { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 12px; }
.wordmark {
  font: 700 clamp(80px, 22vw, 300px)/0.8 var(--font-en); letter-spacing: -0.06em; margin-top: 56px;
  background: linear-gradient(180deg, rgba(13,26,43,.08), rgba(13,26,43,0)); -webkit-background-clip: text; background-clip: text; color: transparent;
  user-select: none;
}

/* スクロール表示 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; } .d3 { transition-delay: .24s; }

@media (max-width: 960px) {
  .nav__links, .nav .btn--dark { display: none; }
  .menu-btn { display: grid; place-items: center; }
  .nav.open .nav__inner { border-radius: 24px; flex-wrap: wrap; }
  .nav.open .nav__links { display: flex; flex-direction: column; gap: 18px; width: 100%; padding: 16px 4px 12px; font-size: 16px; }
  .foot { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}