/* 川助商店 kawasuke store — 墨と和紙と朱 */
:root {
  --paper: #f6f2ea;
  --paper-2: #ede7db;
  --card: #fffdf8;
  --ink: #1d1b19;
  --ink-2: #5b554d;
  --ink-3: #8a8378;
  --line: rgba(29, 27, 25, 0.12);
  --shu: #c8442b;
  --shu-ink: #ffffff;
  --radius: 14px;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141312;
    --paper-2: #1c1a18;
    --card: #211f1c;
    --ink: #eee8dd;
    --ink-2: #b9b1a4;
    --ink-3: #8a8378;
    --line: rgba(238, 232, 221, 0.12);
    --shu: #e0644a;
  }
  /* 家紋は白地の紋なので、暗い背景では白い円の上に載せる */
  .brand img, .hero-kamon, .footer-brand img { background: #fff; border-radius: 50%; }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--shu); text-underline-offset: 3px; }
h1, h2, h3 { font-weight: 700; line-height: 1.4; margin: 0; }
.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }
.pc { display: none; }
@media (min-width: 760px) { .pc { display: inline; } }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; padding-block: 8px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-ja { font-family: var(--sans); font-weight: 700; font-size: 1.15rem; letter-spacing: .08em; }
.brand-en { font-size: .7rem; letter-spacing: .18em; color: var(--ink-3); text-transform: uppercase; }
.site-nav { display: flex; gap: 4px 18px; flex-wrap: wrap; font-size: .9rem; }
.site-nav a { color: var(--ink-2); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--shu); }

/* hero */
.hero { padding: 56px 0 64px; border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; gap: 32px; align-items: center; justify-items: center; text-align: center; }
.hero-kamon { width: min(220px, 56vw); height: auto; }
.eyebrow { margin: 0 0 6px; font-size: .75rem; letter-spacing: .24em; text-transform: uppercase; color: var(--shu); }
.hero h1 { font-size: clamp(2.2rem, 7vw, 3.4rem); letter-spacing: .08em; }
.hero h1:lang(en) { letter-spacing: 0; }
.lead { font-size: 1.15rem; margin: 16px 0 8px; font-weight: 500; }
.sub { color: var(--ink-2); margin: 0; }
@media (min-width: 760px) {
  .hero { padding: 88px 0 96px; }
  .hero-inner { grid-template-columns: auto 1fr; justify-items: start; text-align: left; gap: 56px; }
}

/* sections */
.section { padding: 56px 0; }
.section-muted { background: var(--paper-2); }
.section-title { font-size: 1.5rem; margin-bottom: 28px; display: flex; align-items: baseline; gap: 14px; }
.section-title span { font-size: .8rem; color: var(--shu); letter-spacing: .2em; border: 1px solid var(--shu); padding: 0 8px; border-radius: 4px; font-family: var(--sans); }
.section-title.small { font-size: 1.1rem; margin: 0 0 12px; }

/* app grid */
.app-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.app-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; color: inherit; text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.app-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--shu) 45%, transparent); box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.app-icon { width: 72px; height: 72px; border-radius: 22.5%; flex: none; box-shadow: 0 0 0 1px var(--line); }
.app-icon-lg { width: 112px; height: 112px; }
.app-card h3 { font-size: 1.15rem; margin: 2px 0 4px; }
.app-card p { margin: 0; color: var(--ink-2); font-size: .92rem; line-height: 1.7; }
.app-card-meta { font-size: .75rem; color: var(--ink-3); display: flex; gap: 8px; align-items: center; }
.badge { background: var(--shu); color: var(--shu-ink); border-radius: 999px; padding: 0 8px; font-size: .7rem; }
.more { margin: 24px 0 0; font-size: .9rem; }

.notes { display: grid; gap: 24px; }
@media (min-width: 760px) { .notes { grid-template-columns: 1fr 1fr; gap: 48px; } }
.note h3 { font-size: 1.1rem; margin-bottom: 8px; }
.note p { margin: 0; color: var(--ink-2); font-size: .95rem; }

/* app page */
.app-hero { padding: 48px 0; border-bottom: 1px solid var(--line); }
.app-hero-inner { display: grid; gap: 24px; align-items: center; }
.app-hero h1 { font-size: clamp(1.5rem, 4.5vw, 2.2rem); }
.app-hero .lead { color: var(--ink-2); }
@media (min-width: 760px) { .app-hero-inner { grid-template-columns: auto 1fr; gap: 36px; } .app-icon-lg { width: 140px; height: 140px; } }
.actions { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 20px; border-radius: 999px; font-weight: 600; font-size: .95rem; text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--shu); color: var(--shu-ink); }
.btn-disabled { background: var(--paper-2); color: var(--ink-3); border: 1px dashed var(--line); }

.app-detail { display: grid; gap: 40px; }
@media (min-width: 860px) { .app-detail { grid-template-columns: 1.6fr 1fr; gap: 56px; } }
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.feature-list li { background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--shu); border-radius: 8px; padding: 12px 16px; }
.spec { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; align-self: start; }
.spec .section-title.small + ul { margin-bottom: 20px; }
.plain { list-style: none; padding: 0; margin: 0 0 8px; }
.plain li { padding: 4px 0; border-bottom: 1px dotted var(--line); }
.plain li:last-child { border-bottom: 0; }
.fine { font-size: .8rem; color: var(--ink-3); margin: 0 0 20px; line-height: 1.7; }
.back { margin: 0; }

/* legal */
.legal { max-width: 760px; }
.legal h1 { font-size: clamp(1.6rem, 5vw, 2.1rem); margin-bottom: 4px; }
.legal .updated { color: var(--ink-3); font-size: .85rem; margin: 0 0 32px; }
.legal h2 { font-size: 1.15rem; margin: 40px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.legal ul { padding-left: 1.3em; }
.legal li { margin-bottom: 6px; }
.center { text-align: center; margin-inline: auto; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0 48px; font-size: .88rem; }
.footer-inner { display: grid; gap: 18px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-family: var(--sans); font-weight: 700; letter-spacing: .08em; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.footer-nav a { color: var(--ink-2); text-decoration: none; }
.footer-nav a:hover { color: var(--shu); }
.copyright { color: var(--ink-3); margin: 0; font-size: .78rem; }

/* language switch */
.lang-switch { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; font-size: .78rem; }
.lang-switch a, .lang-switch span { padding: 2px 10px; text-decoration: none; color: var(--ink-2); border: 0 !important; }
.lang-switch span { background: var(--ink); color: var(--paper); }

/* app guide (screenshots) */
.guide-step { display: grid; gap: 28px; align-items: center; padding: 24px 0; }
.guide-step + .guide-step { border-top: 1px solid var(--line); }
.phone { margin: 0 auto; width: min(280px, 72vw); border-radius: 36px; padding: 10px; background: var(--ink); box-shadow: 0 18px 40px rgba(0,0,0,.18); }
.phone img { border-radius: 27px; width: 100%; height: auto; }
.guide-num { margin: 0; font-size: .8rem; font-weight: 700; letter-spacing: .2em; color: var(--shu); }
.guide-text h3 { font-size: 1.35rem; margin: 4px 0 12px; }
.guide-text > p { color: var(--ink-2); margin: 0 0 16px; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .45em; width: 16px; height: 16px; border-radius: 50%; background: var(--shu); -webkit-mask: radial-gradient(circle, #000 0 3px, transparent 3.5px); mask: radial-gradient(circle, #000 0 3px, transparent 3.5px); }
.check-list li::after { content: ""; position: absolute; left: 0; top: .45em; width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--shu); box-sizing: border-box; }
@media (min-width: 860px) {
  .guide-step { grid-template-columns: 300px 1fr; gap: 64px; padding: 40px 0; }
  .guide-step.reverse { grid-template-columns: 1fr 300px; }
  .guide-step.reverse .phone { order: 2; }
  .phone { width: 300px; }
}

/* popularity rank */
.rank { display: inline-flex; align-items: center; gap: 3px; border-radius: 999px; padding: 0 8px 0 6px; font-size: .7rem; font-weight: 700; letter-spacing: .02em; line-height: 1.7; text-transform: none; vertical-align: middle; }
.rank-1 { background: #b8860b; color: #fff; }
.rank-2 { background: #8a8f98; color: #fff; }
.rank-3 { background: #a0623a; color: #fff; }
.eyebrow .rank { margin-left: 6px; letter-spacing: .02em; }

/* about */
.about-lead, .about-list { max-width: 820px; }
.about-lead { font-size: 1.05rem; margin: 0 0 24px; }
.about-list { margin: 0; display: grid; gap: 14px; }
.about-list > div { display: grid; gap: 4px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; }
.about-list dt { font-weight: 700; color: var(--shu); font-size: .9rem; }
.about-list dd { margin: 0; color: var(--ink-2); }
@media (min-width: 760px) { .about-list > div { grid-template-columns: 7em 1fr; gap: 16px; } }

/* popularity notes */
.rank-note { display: flex; align-items: center; gap: 6px; margin: -16px 0 20px; font-size: .82rem; color: var(--ink-3); }
.rank-note svg { color: #b8860b; }
.popular-note { margin: 4px 0 0; padding: 8px 12px; border-left: 3px solid #b8860b; background: color-mix(in srgb, #b8860b 9%, transparent); border-radius: 0 8px 8px 0; font-size: .92rem; color: var(--ink); }
.plan-tag { display: inline-block; margin-left: 8px; padding: 0 8px; border-radius: 999px; background: var(--shu); color: var(--shu-ink); font-size: .7rem; font-weight: 700; line-height: 1.7; vertical-align: middle; }

/* Apple EULA summary */
.apple-eula { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 24px 16px; margin: 32px 0 8px; }
.apple-eula h2 { border-bottom: 0; margin-top: 20px; }
.eula-summary { padding-left: 1.5em; }
.eula-summary li { margin-bottom: 10px; }
.eula-summary li::marker { font-weight: 700; color: var(--shu); }

/* EULA app-specific subsections */
.legal h3 { font-size: 1.02rem; margin: 28px 0 6px; padding-left: 10px; border-left: 3px solid var(--shu); scroll-margin-top: 80px; }

/* app updates (what's new) */
.updates { border-top: 1px solid var(--line); }
.update-main { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.update-badge { display: inline-block; margin: 0 0 8px; padding: 0 10px; border-radius: 999px; background: var(--shu); color: var(--shu-ink); font-size: .75rem; font-weight: 700; line-height: 1.8; }
.update-main h3 { font-size: 1.3rem; margin: 0 0 8px; }
.update-body { color: var(--ink-2); margin: 0 0 20px; }
.update-steps { list-style: none; padding: 0; margin: 0 0 12px; display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
.update-step p { margin: 12px 0 0; font-size: .92rem; display: flex; gap: 8px; align-items: flex-start; }
.update-num { flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--ink); color: var(--paper); font-size: .78rem; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; margin-top: 2px; }
.phone-sm { width: min(220px, 70vw); border-radius: 30px; padding: 8px; }
.phone-sm img { border-radius: 23px; }
.update-others-title { font-size: 1.05rem; margin: 28px 0 12px; }

/* per-app content language switcher */
.feature-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.feature-head .section-title.small { margin: 0; }
.content-lang { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); color: var(--ink-2); font-size: .85rem; }
.content-lang select { border: 0; background: transparent; color: var(--ink); font: inherit; padding: 2px 2px; cursor: pointer; }
.content-lang select:focus { outline: none; }
.content-lang:focus-within { border-color: var(--shu); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }
.update-badges { display: flex; gap: 6px; margin: 0 0 8px; }
.update-badges .update-badge { margin: 0; }
.update-badge-pro { background: #b8860b; }
.update-pro-note { color: var(--ink); }
.update-extra { margin-top: 20px; display: grid; gap: 24px; align-items: center; }
.update-extra .phone-sm { margin: 0 auto; }
@media (min-width: 860px) { .update-extra { grid-template-columns: 240px 1fr; gap: 40px; } }

/* format explainer (chart + table) */
.explainer { margin-top: 36px; }
.explainer > p { color: var(--ink-2); margin: 0 0 16px; }
.ex-bars { margin: 0 0 20px; padding: 18px 20px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); display: grid; gap: 12px; }
.ex-bar-row { display: grid; grid-template-columns: 7.5em 1fr 5em; gap: 10px; align-items: center; font-size: .9rem; }
.ex-bar-label { font-weight: 700; }
.ex-bar-track { height: 14px; background: var(--paper-2); border-radius: 999px; overflow: hidden; }
.ex-bar { display: block; height: 100%; border-radius: 999px; }
.ex-bar-0 { background: var(--ink-3); }
.ex-bar-1 { background: var(--shu); }
.ex-bar-note { color: var(--ink-2); font-size: .85rem; }
.ex-bars figcaption { font-size: .78rem; color: var(--ink-3); }
.ex-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.ex-table { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 480px; }
.ex-table th, .ex-table td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.6; }
.ex-table tr:last-child th, .ex-table tr:last-child td { border-bottom: 0; }
.ex-table thead th { background: var(--paper-2); font-size: .82rem; }
.ex-table tbody th { white-space: nowrap; color: var(--ink-2); font-weight: 600; }
.ex-tip { margin: 16px 0 0; padding: 12px 14px; border-left: 3px solid var(--shu); background: color-mix(in srgb, var(--shu) 7%, transparent); border-radius: 0 8px 8px 0; font-size: .92rem; }
.ex-sources { margin-top: 14px; font-size: .78rem; color: var(--ink-3); }
.ex-sources p { margin: 0 0 4px; font-weight: 700; }
.ex-sources ul { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }
.app-detail > * { min-width: 0; }

/* AI向けの要約・おすすめ・よくある質問 */
.tldr { margin: 16px 0 4px; padding: 14px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.tldr h2 { font-size: .85rem; color: var(--shu); margin: 0 0 6px; letter-spacing: .06em; }
.tldr p { margin: 0; font-size: .95rem; line-height: 1.8; }
.tldr-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tldr-tags span { font-size: .75rem; padding: 2px 10px; border-radius: 999px; background: var(--paper-2); color: var(--ink-2); }
.needs-section { border-top: 1px solid var(--line); }
.needs { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.need { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; display: flex; flex-direction: column; }
.need h3 { font-size: 1rem; margin: 0 0 6px; }
.need p { margin: 0; color: var(--ink-2); font-size: .9rem; }
.need .need-how { margin-top: auto; padding-top: 8px; font-size: .82rem; color: var(--shu); font-weight: 600; }
.faq-section { border-top: 1px solid var(--line); }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; margin-bottom: 10px; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq details p { margin: 10px 0 0; color: var(--ink-2); }