:root {
  --primary: #0F766E;
  --accent: #0284C7;
  --heading: #0F172A;
  --text: #334155;
  --sub: #64748B;
  --soft: #F8FAFC;
  --border: #E2E8F0;
  --white: #FFFFFF;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--white); font-family: Inter, "Noto Sans JP", sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header { border-bottom: 1px solid var(--border); background: rgba(255,255,255,.96); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand img { width: 146px; height: auto; }
.header-nav { display: flex; gap: 24px; font-size: 14px; font-weight: 600; }
.header-nav a:hover { color: var(--primary); }
.download-hero { padding: 86px 0 58px; background: linear-gradient(180deg, #F0FDFA 0%, #FFFFFF 100%); }
.hero-inner { max-width: 760px; text-align: center; }
.eyebrow { display: inline-block; color: var(--primary); font-size: 12px; font-weight: 700; letter-spacing: .18em; }
h1 { margin: 12px 0 18px; color: var(--heading); font-size: clamp(34px, 6vw, 52px); line-height: 1.22; }
.hero-inner p { margin: 0; font-size: 18px; color: var(--sub); }
.download-section { padding: 64px 0 96px; }
.app-card { display: grid; grid-template-columns: 72px minmax(0,1fr) auto; gap: 28px; align-items: start; padding: 34px; border: 1px solid var(--border); border-radius: 18px; box-shadow: 0 18px 42px rgba(15,23,42,.07); }
.app-icon { width: 72px; height: 72px; display: grid; place-items: center; border-radius: 18px; background: var(--soft); }
.app-icon img { width: 54px; height: 54px; object-fit: contain; }
.app-meta { color: var(--primary); font-size: 13px; font-weight: 700; }
h2 { margin: 5px 0 10px; color: var(--heading); font-size: 28px; line-height: 1.35; }
.app-copy > p { margin: 0 0 18px; }
.notice { display: grid; gap: 2px; padding: 14px 16px; border-radius: 12px; background: var(--soft); font-size: 14px; }
.notice strong { color: var(--heading); }
.notice span { color: var(--sub); }
.app-action { min-width: 220px; text-align: center; padding-top: 12px; }
.download-button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; width: 100%; padding: 0 22px; border-radius: 10px; background: var(--primary); color: #fff; font-weight: 700; transition: transform .15s ease, opacity .15s ease; }
.download-button:not(.is-disabled):hover { transform: translateY(-1px); }
.download-button.is-disabled { opacity: .45; pointer-events: none; }
.download-status { margin: 10px 0 0; color: var(--sub); font-size: 12px; line-height: 1.5; }
.download-status.is-error { color: #B42318; }
.site-footer { border-top: 1px solid var(--border); background: var(--soft); }
.footer-inner { min-height: 92px; display: flex; justify-content: space-between; align-items: center; gap: 24px; font-size: 13px; color: var(--sub); }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-inner a:hover { color: var(--primary); }
@media (max-width: 780px) {
  .header-nav { display: none; }
  .download-hero { padding: 64px 0 42px; }
  .app-card { grid-template-columns: 56px 1fr; gap: 18px; padding: 24px; }
  .app-icon { width: 56px; height: 56px; border-radius: 14px; }
  .app-icon img { width: 42px; height: 42px; }
  .app-action { grid-column: 1 / -1; min-width: 0; padding-top: 4px; }
  .footer-inner { padding: 26px 0; flex-direction: column; align-items: flex-start; }
}