:root {
  --color-text: #1c1f26;
  --color-muted: #5b6472;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-border: #e3e7ee;
  --color-primary: #2d4fd6;
  --color-primary-dark: #1e37a3;
  --color-it: #3b6fe0;
  --color-th: #d8453a;
  --color-ja: #2f9e6e;
  --max-width: 1040px;
  --radius: 12px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

h1, h2, h3 { line-height: 1.4; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}
.logo:hover { text-decoration: none; }
.logo__mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.6rem;
  object-fit: cover;
  flex-shrink: 0;
}
.logo__sub {
  display: block;
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--color-muted);
}

/* 多言語感を出す上部ストリップ */
.lang-strip {
  margin: 0;
  background: linear-gradient(90deg, var(--color-it), #6c4fd6 50%, var(--color-th));
  overflow-x: auto;
  scrollbar-width: none;
}
.lang-strip::-webkit-scrollbar { display: none; }
.lang-strip__inner {
  display: flex;
  gap: 1rem;
  padding: 0.35rem 1.25rem;
  color: #fff;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
  justify-content: center;
}
.lang-strip__item { opacity: 0.95; }
.lang-strip__item:not(:last-child)::after {
  content: "・";
  margin-left: 1rem;
  opacity: 0.7;
}

.site-nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.site-nav__link {
  color: var(--color-text);
  font-size: 0.92rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border-bottom: 2px solid transparent;
}
.site-nav__link:hover { text-decoration: none; background: var(--color-bg-alt); }
.site-nav__link--it { border-bottom-color: var(--color-it); }
.site-nav__link--th { border-bottom-color: var(--color-th); }
.site-nav__link--ja { border-bottom-color: var(--color-ja); }

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
  padding: 3.5rem 0;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0 0 0.75rem;
}
.hero p {
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Sections */
.section { padding: 3rem 0; }
.section--alt { background: var(--color-bg-alt); }
.section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}
.section-lead {
  color: var(--color-muted);
  margin-bottom: 2rem;
  max-width: 640px;
}

/* App cards */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.app-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.app-card__logo {
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 1rem;
  object-fit: cover;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}
.app-card__logo--placeholder,
.app-hero__logo--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 1px solid var(--color-border);
}
.app-hero__logo--placeholder { font-size: 3rem; }
.app-card__badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-muted);
  width: fit-content;
}
.app-card h3 { margin: 0; font-size: 1.25rem; }
.app-card p { margin: 0; color: var(--color-muted); font-size: 0.95rem; }
.app-card a.btn { margin-top: auto; }

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn--ghost:hover { background: var(--color-bg-alt); }
.btn--disabled {
  background: var(--color-border);
  color: var(--color-muted);
  pointer-events: none;
}

/* App detail page */
.app-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
}
.app-hero__inner {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.app-hero__logo {
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 1.5rem;
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}
.app-hero__qr {
  flex-shrink: 0;
  text-align: center;
  margin-left: auto;
}
.app-hero__qr img {
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  background: #fff;
}
.app-hero__qr p {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  color: var(--color-muted);
  line-height: 1.4;
}
.app-hero__tag {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}
.feature-list li {
  padding-left: 1.5rem;
  position: relative;
}
.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* Contact form */
.contact-form {
  display: grid;
  gap: 1.25rem;
  max-width: 560px;
  margin-top: 1.5rem;
}
.form-field {
  display: grid;
  gap: 0.4rem;
}
.form-field label {
  font-weight: 600;
  font-size: 0.92rem;
}
.form-field .required {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  margin-left: 0.35rem;
  vertical-align: middle;
}
.form-field input[type="text"],
.form-field input[type="email"],
.form-field select,
.form-field textarea {
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  width: 100%;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.form-field textarea { resize: vertical; min-height: 8rem; }
.contact-form .btn { justify-self: start; border: none; cursor: pointer; }
.form-note {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: -0.5rem;
}
.form-status {
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  font-size: 0.92rem;
  display: none;
}
.form-status--success { background: #e7f6ee; color: #1e7a4c; }
.form-status--error { background: #fdecea; color: #b3261e; }
.form-status.is-visible { display: block; }

/* Blog */
.post-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.5rem; }
.post-list li {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
}
.post-list time { color: var(--color-muted); font-size: 0.85rem; }
.post-list h3 { margin: 0.25rem 0 0.4rem; }
.post-list__category {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  margin-right: 0.5rem;
}
article.post h1 { margin-bottom: 0.5rem; }
article.post .post-meta { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 2rem; }
article.post .post-meta__category { margin-bottom: 0.5rem; font-size: 0.85rem; font-weight: 600; }
article.post h2 { margin-top: 2rem; font-size: 1.3rem; }
article.post ul, article.post ol { padding-left: 1.4rem; }
article.post table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
article.post th, article.post td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-size: 0.92rem;
}
article.post th { background: var(--color-bg-alt); white-space: nowrap; }
.post-cta {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  text-align: center;
}
.post-cta p { margin: 0 0 0.75rem; font-weight: 600; }

/* Category nav (hub page) */
.category-nav {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}
.category-nav__label { font-size: 0.85rem; color: var(--color-muted); margin-right: 0.5rem; }
.category-nav__chip {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  margin: 0.2rem 0.3rem 0.2rem 0;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-primary);
}
.category-nav__chip:hover { background: var(--color-border); text-decoration: none; }

/* Category groups (hub page) */
.post-category-group { scroll-margin-top: 1rem; }
.post-category-group + .post-category-group { margin-top: 2.5rem; }
.post-category-group__title {
  scroll-margin-top: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

/* Related-by-category (post page) */
.post-related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}
.post-related__title { scroll-margin-top: 1rem; }

/* Breadcrumbs */
.breadcrumbs { padding: 0.85rem 0; }
.breadcrumbs__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-muted);
}
.breadcrumbs__list li { display: flex; align-items: center; gap: 0.4rem; }
.breadcrumbs__list li:not(:last-child)::after { content: "›"; margin-left: 0.4rem; color: var(--color-border); }
.breadcrumbs__list a { color: var(--color-muted); }
.breadcrumbs__list a:hover { color: var(--color-primary); }

/* FAQ */
.faq-list { display: grid; gap: 1rem; max-width: 720px; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.faq-item h3 { margin: 0 0 0.5rem; font-size: 1.02rem; }
.faq-item p { margin: 0; color: var(--color-muted); }

/* Legal pages */
.legal h1 { margin-bottom: 0.5rem; }
.legal .updated { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 2rem; }
.legal h2 { font-size: 1.2rem; margin-top: 2rem; }
.legal-table-scroll { overflow-x: auto; margin: 1rem 0; }
.legal table { border-collapse: collapse; width: 100%; min-width: 480px; margin: 0; }
.legal th, .legal td {
  border: 1px solid var(--color-border);
  padding: 0.6rem 0.8rem;
  text-align: left;
  font-size: 0.95rem;
  vertical-align: top;
}
.legal th { background: var(--color-bg-alt); width: 30%; white-space: nowrap; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  margin-top: 3rem;
  padding-top: 2.5rem;
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  padding-bottom: 2rem;
}
.site-footer__brand { font-weight: 700; margin: 0; }
.site-footer__note { color: var(--color-muted); margin: 0.25rem 0 0; font-size: 0.9rem; }
.site-footer__nav { display: flex; flex-direction: column; gap: 0.5rem; }
.site-footer__nav a { color: var(--color-text); font-size: 0.9rem; }
.site-footer__copyright {
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  color: var(--color-muted);
  font-size: 0.8rem;
}

.btn-group { display: flex; flex-wrap: wrap; gap: 0.75rem; }

@media (max-width: 600px) {
  .site-footer__inner { flex-direction: column; gap: 1rem; }

  .hero { padding: 2.25rem 0; }
  .section { padding: 2rem 0; }
  .app-hero { padding: 2rem 0 1.5rem; }
  .app-card { padding: 1.25rem; }
  .site-header__inner { padding-top: 0.65rem; padding-bottom: 0.65rem; }
  .logo { font-size: 1rem; }
  .site-nav { width: 100%; justify-content: flex-start; gap: 0.25rem; }
  .site-nav__link { padding: 0.35rem 0.6rem; font-size: 0.85rem; }
  .lang-strip__inner { justify-content: flex-start; padding: 0.35rem 1rem; }
  .app-hero__inner { flex-direction: column; text-align: center; gap: 1rem; }
  .app-hero__logo { width: 5.5rem; height: 5.5rem; }
  /* スマホでは既にApp Storeへ直接遷移できるため、QRコードは非表示にする */
  .app-hero__qr { display: none; }
}