:root {
  --ink: #202128;
  --muted: #63656f;
  --brand: #d96735;
  --brand-dark: #a83f1d;
  --pale: #fff0e7;
  --paper: #fbf8f2;
  --surface: rgba(255, 255, 255, 0.82);
  --line: #e6dfd5;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, rgba(255, 203, 164, 0.28), transparent 28rem),
    var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
html[lang="en"] body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--brand-dark); text-underline-offset: 0.2em; }
p, li { color: var(--muted); }
.i18n { display: none; }
html[lang="ja"] .i18n[lang="ja"],
html[lang="en"] .i18n[lang="en"] { display: block; }

.wrap { width: min(46rem, calc(100% - 40px)); margin: 0 auto; padding: 2.5rem 0 5rem; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 3.5rem; }
.brand { color: var(--ink); font-size: 1.08rem; font-weight: 800; text-decoration: none; letter-spacing: -0.02em; }
.brand-mark { color: var(--brand); }
.lang-switch { display: flex; align-items: center; gap: 0.45rem; color: #aaa39a; font-size: 0.78rem; }
.lang-switch button { border: 0; padding: 0.35rem 0.1rem; color: #918d88; background: transparent; cursor: pointer; font: inherit; font-weight: 750; }
html[lang="ja"] [data-set-lang="ja"],
html[lang="en"] [data-set-lang="en"] { color: var(--brand-dark); }

header { margin-bottom: 2.25rem; }
.eyebrow { margin: 0 0 0.75rem; color: var(--brand); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
h1 { margin: 0 0 0.45rem; font-size: clamp(2.2rem, 7vw, 3.25rem); line-height: 1.2; letter-spacing: -0.045em; }
h2 { margin: 2.6rem 0 0.65rem; color: var(--ink); font-size: 1.16rem; line-height: 1.5; }
p { margin: 0.7rem 0; }
ul { margin: 0.75rem 0; padding-left: 1.4rem; }
li + li { margin-top: 0.25rem; }
.updated { margin: 0; font-size: 0.84rem; }
.note { margin: 1.5rem 0; padding: 1.1rem 1.2rem; border: 1px solid #f0d7c7; border-radius: 14px; background: var(--pale); font-size: 0.9rem; }
.affiliate-disclosure { margin: 1.5rem 0 2rem; padding: 1.1rem 1.2rem; border: 1px solid #e2c5b2; border-radius: 14px; background: #fff7f1; }
.affiliate-disclosure strong { display: block; margin-bottom: 0.25rem; color: var(--ink); font-size: 0.92rem; }
.affiliate-disclosure p { margin: 0; color: #55515a; font-size: 0.9rem; }
.program-list { display: grid; gap: 0.75rem; padding-left: 1.35rem; }
.program-list li { padding-left: 0.15rem; }
.program-list strong { color: var(--ink); }
.page-nav { display: flex; flex-wrap: wrap; gap: 0.7rem 1.35rem; margin-top: 3.2rem; padding-top: 1.3rem; border-top: 1px solid var(--line); font-size: 0.88rem; }

.home { display: grid; align-content: center; min-height: 100vh; padding-block: 4rem; }
.home header { max-width: 38rem; margin-bottom: 2.5rem; }
.home h1 span { color: var(--brand); }
.home .lead { font-size: 1.02rem; }
.link-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.link-card { display: block; padding: 1.5rem; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); color: var(--ink); text-decoration: none; box-shadow: 0 14px 40px rgba(67, 44, 29, 0.05); }
.link-card strong { display: block; margin-bottom: 0.2rem; }
.link-card span { color: var(--muted); font-size: 0.85rem; }
.link-card:hover { border-color: #d7ae96; transform: translateY(-1px); }
.home footer { margin-top: 3rem; color: #979088; font-size: 0.76rem; }

@media (max-width: 600px) {
  .wrap { width: min(100% - 32px, 46rem); padding-top: 1.5rem; }
  .top { margin-bottom: 2.75rem; }
  .link-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: no-preference) {
  .link-card { transition: border-color 160ms ease, transform 160ms ease; }
}

/* ---------- landing page ---------- */
.landing { display: block; min-height: auto; padding-block: 2rem 5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.45rem; }
.brand-icon { width: 28px; height: 28px; }
.fine { margin: 0.6rem 0 0; color: #8f8a83; font-size: 0.8rem; }
.btn { display: inline-block; padding: 0.8rem 1.35rem; border: 0; border-radius: 999px; font: inherit; font-weight: 750; text-decoration: none; cursor: pointer; }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 10px 24px rgba(217, 103, 53, 0.25); }
.btn-primary:hover { background: var(--brand-dark); }
.btn-primary:disabled { background: #cfc6bb; box-shadow: none; cursor: default; }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: var(--surface); }

/* 上半分：アプリ風の外枠 */
.app-shell { margin: 0 0 3.5rem; border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: 0 24px 60px rgba(67, 44, 29, 0.10); overflow: hidden; }
.app-bar { display: flex; align-items: center; gap: 0.85rem; padding: 1rem 1.25rem; background: #f4f7fb; border-bottom: 1px solid #e3e8ef; }
.app-bar .i18n { display: none; }
html[lang="ja"] .app-bar .i18n[lang="ja"], html[lang="en"] .app-bar .i18n[lang="en"] { display: block; }
.app-bar-icon { width: 40px; height: 40px; border-radius: 10px; }
.app-title { margin: 0; font-size: 1.15rem; letter-spacing: -0.02em; line-height: 1.2; }
.app-sub { margin: 0; color: var(--muted); font-size: 0.8rem; }
.app-body { padding: 1.1rem 1.25rem 1.25rem; }
.app-body .i18n, .opt .i18n, .opt-note.i18n { display: none; }
html[lang="ja"] .app-body .i18n[lang="ja"], html[lang="en"] .app-body .i18n[lang="en"],
html[lang="ja"] .opt .i18n[lang="ja"], html[lang="en"] .opt .i18n[lang="en"] { display: inline; }
html[lang="ja"] .app-body p.i18n[lang="ja"], html[lang="en"] .app-body p.i18n[lang="en"] { display: block; }
.kw-label { display: block; margin: 0 0 0.35rem; color: var(--ink); font-size: 0.8rem; font-weight: 750; }
.kw { width: 100%; padding: 0.9rem 1rem; border: 1px solid #cfd6df; border-radius: 12px; background: #fff; color: var(--ink); font: inherit; font-size: 1.05rem; }
.kw:focus { outline: 2px solid #2f80ed; outline-offset: 1px; border-color: #2f80ed; }
.opt-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; margin-top: 0.8rem; }
.opt { display: inline-flex; align-items: center; gap: 0.35rem; color: var(--ink); font-size: 0.9rem; }
.opt input { width: 1.05rem; height: 1.05rem; accent-color: #2f80ed; }
.opt-note { flex-basis: 100%; color: #8f8a83; font-size: 0.78rem; }
.site-grid { display: grid; gap: 0.55rem; margin-top: 1rem; }
.site-card { display: flex; align-items: center; gap: 0.8rem; padding: 0.65rem 0.9rem 0.65rem 0.7rem; border: 1px solid #e6e9ee; border-radius: 16px; background: #f8f9fb; color: var(--ink); text-decoration: none; box-shadow: 0 2px 6px rgba(20, 30, 50, 0.05); }
.site-card:hover:not(.is-disabled) { border-color: #bcd3f5; background: #fff; transform: translateY(-1px); }
.site-card.is-disabled { opacity: 0.5; cursor: not-allowed; }
.site-card.is-visited { background: #eef6ff; border-color: #cfe1fb; }
.site-icon { flex: none; width: 40px; height: 40px; border-radius: 9px; object-fit: contain; background: #fff; }
.site-text { flex: 1; min-width: 0; }
.site-text strong { display: block; color: var(--ink); font-size: 0.98rem; line-height: 1.3; }
.site-text > span { display: block; color: var(--muted); font-size: 0.74rem; word-break: break-all; }
.site-card.is-visited .site-text strong::after { content: " ✓"; color: #2f80ed; }
.site-arrow { flex: none; color: #5f6b7a; font-size: 1.1rem; }

/* 下半分：説明 */
.hero { display: grid; grid-template-columns: 1.3fr 1fr; gap: 2rem; align-items: center; margin-bottom: 3rem; }
.h1like { margin: 0 0 0.6rem; font-size: clamp(1.9rem, 5.5vw, 2.7rem); line-height: 1.2; letter-spacing: -0.04em; }
.h1like span { color: var(--brand); }
.lead strong { color: var(--ink); }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.4rem; }
.hero-art img { width: 100%; height: auto; display: block; }
.hero-art.missing { aspect-ratio: 4 / 3; border-radius: 20px; background: linear-gradient(135deg, #fff0e7, #fbf8f2); border: 1px dashed #e2c5b2; }
.hero-art.missing img { display: none; }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.feature-grid article { padding: 1.25rem 1.3rem; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.feature-art { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border-radius: 12px; margin-bottom: 0.8rem; }
.feature-grid h3 { margin: 0 0 0.35rem; color: var(--ink); font-size: 1rem; }
.feature-grid p { margin: 0; font-size: 0.9rem; }
.how p strong { color: var(--ink); }
.faq dl { margin: 0.75rem 0 0; }
.faq dt { margin-top: 1rem; color: var(--ink); font-weight: 750; }
.faq dd { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.93rem; }

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .feature-grid { grid-template-columns: 1fr; }
}