/* 皮算用 — サイト共通スタイル（ライト／ダーク対応・スマホ対応） */

:root {
  --bg: #f7f3ec;
  --bg-alt: #efe8dc;
  --surface: #fffdf9;
  --text: #2b2420;
  --text-sub: #6b5f55;
  --line: #e2d8c9;
  --accent: #a4532b;        /* 狸色（赤茶） */
  --accent-strong: #8a4222;
  --accent-soft: #f3e2d6;
  --on-accent: #fff;
  --shadow: 0 1px 2px rgba(60, 40, 20, .06), 0 6px 20px rgba(60, 40, 20, .07);
  --radius: 14px;
  --maxw: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "BIZ UDPGothic", Meiryo, sans-serif;
  --font-serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1714;
    --bg-alt: #221d19;
    --surface: #272220;
    --text: #efe7de;
    --text-sub: #b3a69a;
    --line: #3b332d;
    --accent: #e08a5c;
    --accent-strong: #f0a379;
    --accent-soft: #3a2a21;
    --on-accent: #1b1714;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--accent); text-underline-offset: .2em; }
a:hover { color: var(--accent-strong); }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--on-accent); padding: 8px 12px; z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- ヘッダー ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  -webkit-backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; min-height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none;
}
.brand:hover { color: var(--text); }
.brand-mark { width: 34px; height: 34px; flex: none; }
.brand-name { font-family: var(--font-serif); font-weight: 700; font-size: 1.35rem; letter-spacing: .08em; }

.site-nav ul { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.site-nav a {
  display: block; padding: 6px 12px; border-radius: 8px;
  color: var(--text-sub); text-decoration: none; font-size: .95rem;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); background: var(--bg-alt); }

/* ---------- ヒーロー ---------- */
.hero { padding: 72px 0 56px; text-align: center; }
.hero-title {
  font-family: var(--font-serif); font-weight: 700;
  font-size: clamp(3.2rem, 12vw, 5.6rem);
  letter-spacing: .18em; line-height: 1.2; margin: 0 0 .1em .18em;
}
.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 3.6vw, 1.45rem);
  color: var(--accent); margin: 0 0 20px; letter-spacing: .08em;
}
.hero-lead { color: var(--text-sub); max-width: 34em; margin: 0 auto; }
.hero-mark { width: 72px; height: 72px; margin: 0 auto 18px; display: block; }

/* ---------- セクション ---------- */
.section { padding: 48px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: 1.5rem; margin: 0 0 8px; letter-spacing: .04em;
  display: flex; align-items: center; gap: 10px;
}
.section-title::before {
  content: ""; width: 6px; height: 1.2em; border-radius: 3px; background: var(--accent);
}
.section-desc { color: var(--text-sub); margin: 0 0 24px; }

/* ---------- 絞り込み ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 20px; padding: 0; list-style: none; }
.filter-btn {
  font: inherit; font-size: .9rem; cursor: pointer;
  padding: 4px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text-sub);
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* ---------- アプリカード ---------- */
.app-grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  list-style: none; margin: 0; padding: 0;
}
.app-card {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px; transition: transform .15s ease, border-color .15s ease;
}
.app-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.app-card[hidden] { display: none; }
.app-card-head { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.app-icon {
  width: 52px; height: 52px; flex: none; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
}
.app-icon svg { width: 30px; height: 30px; }
.app-card h3 { font-size: 1.15rem; margin: 0; line-height: 1.4; }
.app-card h3 a { color: var(--text); text-decoration: none; }
.app-card h3 a:hover { color: var(--accent); }
.app-card p { color: var(--text-sub); font-size: .95rem; margin: 0 0 14px; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 16px; padding: 0; }
.tag {
  font-size: .78rem; padding: 1px 10px; border-radius: 999px;
  background: var(--bg-alt); color: var(--text-sub);
}
.app-card-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.badge-new {
  font-size: .7rem; font-weight: 700; padding: 1px 8px; border-radius: 999px;
  background: var(--accent); color: var(--on-accent); vertical-align: middle; margin-left: 6px;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-size: .95rem; font-weight: 600; line-height: 1.2;
  padding: 10px 18px; border-radius: 10px; cursor: pointer;
  text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-strong); color: var(--on-accent); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 14px 26px; font-size: 1.05rem; }
.btn svg { width: 1em; height: 1em; }

/* ---------- 広告枠（中身が空なら非表示） ---------- */
.ad-slot { margin: 32px auto; text-align: center; min-height: 100px; }
.ad-slot:empty { display: none; }
.ad-label { display: block; font-size: .7rem; color: var(--text-sub); letter-spacing: .1em; }

/* ---------- 説明（このサイトについて） ---------- */
.about-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.about-item { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.about-item h3 { margin: 0 0 6px; font-size: 1.05rem; }
.about-item p { margin: 0; color: var(--text-sub); font-size: .95rem; }

/* ---------- 下層ページ ---------- */
.breadcrumb { font-size: .85rem; color: var(--text-sub); padding: 16px 0 0; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumb li:not(:last-child)::after { content: "›"; margin-left: 6px; }
.breadcrumb a { color: var(--text-sub); }

.page-head { padding: 28px 0 8px; }
.page-head h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); margin: 0 0 8px; line-height: 1.35; }
.page-head .lead { color: var(--text-sub); margin: 0; }

.app-hero { display: flex; gap: 20px; align-items: center; padding: 28px 0 8px; }
.app-hero .app-icon { width: 76px; height: 76px; border-radius: 18px; }
.app-hero .app-icon svg { width: 44px; height: 44px; }
.app-hero h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); margin: 0; line-height: 1.35; }
.app-hero .lead { color: var(--text-sub); margin: 4px 0 0; }

.cta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 20px 0 8px; }
.cta-note { font-size: .85rem; color: var(--text-sub); }

.prose { max-width: 760px; }
.prose h2 { font-size: 1.3rem; margin: 2em 0 .6em; padding-bottom: .3em; border-bottom: 1px solid var(--line); }
.prose h3 { font-size: 1.08rem; margin: 1.6em 0 .4em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .25em 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: .95rem; margin: 1em 0; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--bg-alt); white-space: nowrap; }

.feature-list { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); list-style: none; padding: 0 !important; }
.feature-list li { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin: 0; }
.feature-list strong { display: block; margin-bottom: 2px; }
.feature-list span { color: var(--text-sub); font-size: .92rem; }

.steps { counter-reset: step; list-style: none; padding: 0 !important; }
.steps li { counter-increment: step; position: relative; padding-left: 44px; margin: 0 0 14px; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; font-size: .9rem;
  background: var(--accent); color: var(--on-accent);
}

.note {
  background: var(--accent-soft); border-radius: 12px; padding: 14px 18px; font-size: .93rem;
}
.note p { margin: 0; }

/* ---------- フッター ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 32px 0 40px; margin-top: 48px; color: var(--text-sub); font-size: .9rem; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
.footer-nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; }
.footer-nav a { color: var(--text-sub); text-decoration: none; }
.footer-nav a:hover { color: var(--accent); text-decoration: underline; }
.copyright { margin: 0; }

/* ---------- スマホ ---------- */
@media (max-width: 640px) {
  .site-header .container { flex-direction: column; align-items: stretch; gap: 0; padding-top: 8px; }
  .brand { justify-content: center; }
  .site-nav ul { justify-content: center; }
  .site-nav a { padding: 6px 10px; font-size: .9rem; }
  .site-header { position: static; }
  .hero { padding: 48px 0 40px; }
  .app-hero { align-items: flex-start; }
  .app-hero .app-icon { width: 60px; height: 60px; }
  .app-hero .app-icon svg { width: 34px; height: 34px; }
  .cta .btn { flex: 1 1 100%; }
  .prose th { white-space: normal; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .app-card { transition: none; }
  .app-card:hover { transform: none; }
}