/* ============================================================
   ナツ印 — 公開サイト（natsu-in.com）
   方針：外部フォント・外部スクリプト・解析タグを読み込まない
  （アプリの「通信しない」と同じ立場。プライバシーを謳うページが第三者へ接続しに行かない）。
   作りは QRデコの公開サイトと同じ（docs/SITE-PLAYBOOK.md は QRデコのリポジトリ）。
   ============================================================ */

/* ---------- tokens ---------- */
:root {
  color-scheme: light dark;

  --paper:   #fefbf6;          /* アイコンの背景と同じ */
  --paper-2: #f6f0e6;
  --paper-3: #ece4d7;
  --ink:     #1d1916;
  --ink-2:   #48413b;
  --muted:   #6b635b;          /* paper 5.71 / paper-2 5.20 */
  --line:    rgb(29 25 22 / .12);
  --line-2:  rgb(29 25 22 / .26);
  --shu:     #ea3c1e;          /* 印影の朱（図形・飾り用） */
  --accent:  #c8311a;          /* 朱を文字用に深くしたもの：paper 5.20 / paper-2 4.74 */
  --accent-ink: #ffffff;       /* accent の上の白：5.37 */
  --accent-soft: rgb(234 60 30 / .09);
  --warn:    #8a4f00;
  --warn-soft: rgb(154 91 0 / .09);
  --band-bg: var(--ink);
  --band-fg: var(--paper);
  --band-fg-2: #cfc6bb;        /* ink の上で 10.3 */
  --card:    #ffffff;
  --shadow:  0 1px 2px rgb(60 30 10 / .06), 0 14px 40px -14px rgb(60 30 10 / .22);

  --font: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
          "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
  --round: "NatsuRounded", var(--font);   /* 見出しだけ。site/fonts/rounded.woff2（tools/site/subset_font.py） */
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --fs--1: .875rem;
  --fs-0:  1.0625rem;
  --fs-1:  1.25rem;
  --fs-2:  1.5rem;
  --fs-3:  clamp(1.75rem, 1.25rem + 1.8vw, 2.375rem);
  --fs-4:  clamp(2.25rem, 1rem + 4.6vw, 4.5rem);

  --s-1: .5rem; --s0: 1rem; --s1: 1.5rem; --s2: 2rem; --s3: 3rem; --s4: 4rem;
  --section: clamp(4.5rem, 10vw, 9rem);
  --gutter:  clamp(1.25rem, 4vw, 2.5rem);
  --max:     72rem;
  --prose:   42rem;
  --radius:  1.125rem;
  --ease:    cubic-bezier(.2, .7, .2, 1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper:   #141110;
    --paper-2: #1c1816;
    --paper-3: #28221f;
    --ink:     #f3eee6;
    --ink-2:   #c9c1b7;
    --muted:   #998f86;          /* paper 5.93 / paper-2 5.56 */
    --line:    rgb(243 238 230 / .13);
    --line-2:  rgb(243 238 230 / .28);
    --accent:  #ff7a5c;          /* paper 7.33 */
    --accent-ink: #141110;
    --accent-soft: rgb(255 122 92 / .13);
    --warn:    #f0c27a;
    --warn-soft: rgb(240 194 122 / .10);
    --band-bg: #f3eee6;
    --band-fg: #1d1916;
    --band-fg-2: #4f4741;
    --card:    #fffdf9;
    --shadow:  0 1px 2px rgb(0 0 0 / .4), 0 16px 48px -12px rgb(0 0 0 / .6);
  }
}

/* ---------- fonts ---------- */
/* 見出し用の丸ゴシック（M PLUS Rounded 1c ExtraBold・SIL OFL 1.1・site/fonts/OFL-MPLUSRounded1c.txt）。
   見出しで使う文字だけに絞って、このサイトから配信する（外部のフォントは読み込まない）。 */
@font-face {
  font-family: "NatsuRounded";
  src: url("/fonts/rounded.woff2") format("woff2");
  font-weight: 800;
  font-display: swap;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  font-family: var(--font);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  hanging-punctuation: allow-end;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: var(--fs-0);
  line-height: 1.9;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  font-feature-settings: "palt" 1, "kern" 1;
  text-wrap: balance;
}
h1, h2 { font-family: var(--round); font-weight: 800; }
h2 { font-size: var(--fs-3); }
/* 見出しは句の途中で折り返さない：.nw で区切った句の間だけで改行する */
.nw { display: inline-block; white-space: nowrap; }
h1, h2, h3 { text-spacing-trim: trim-start; }
h3 { font-size: var(--fs-1); }
p  { margin: 0; text-wrap: pretty; overflow-wrap: anywhere; }
p + p { margin-top: 1em; }
a  { color: var(--accent); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--accent); color: var(--accent-ink); }
svg { display: block; }
img { max-width: 100%; height: auto; }
strong { font-weight: 700; }
kbd { font-family: var(--font); font-size: .9em; padding: .05em .45em; border-radius: .4em; border: 1px solid var(--line-2); border-bottom-width: 2px; background: var(--paper); }

.wrap { max-width: var(--max); margin-inline: auto; padding-inline: max(var(--gutter), env(safe-area-inset-left)) max(var(--gutter), env(safe-area-inset-right)); }
.prose { max-width: var(--prose); }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--muted);
}
.eyebrow::before { content: ""; width: .55rem; height: .55rem; border-radius: 50%; border: 2px solid var(--shu); }
.skip {
  position: absolute; left: var(--gutter); top: -3rem;
  background: var(--ink); color: var(--paper); padding: .5rem .9rem; border-radius: .5rem;
  text-decoration: none; z-index: 100; transition: top .2s;
}
.skip:focus { top: .75rem; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  -webkit-backdrop-filter: saturate(1.6) blur(16px);
  backdrop-filter: saturate(1.6) blur(16px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: var(--s2); min-height: 3.75rem; }
.brand {
  display: inline-flex; align-items: center; gap: .65rem;
  color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -.01em;
}
.brand .mark { width: 1.75rem; height: 1.75rem; border-radius: 22.5%; box-shadow: 0 0 0 1px var(--line); }
.brand small { font-family: var(--mono); font-weight: 500; font-size: .7rem; letter-spacing: .12em; color: var(--muted); }
.brand { white-space: nowrap; }
@media (max-width: 30em) { .site-header .brand small { display: none; } .site-header .wrap { gap: var(--s0); } }
.app-icon { display: block; width: clamp(4.5rem, 3.75rem + 2vw, 6rem); height: auto; border-radius: 22.5%;
  box-shadow: 0 0 0 1px var(--line), var(--shadow); }
.hero .app-icon + .eyebrow { margin-top: var(--s1); }
.site-nav { margin-left: auto; display: flex; gap: clamp(1.1rem, 3vw, 2rem); }
.site-nav a {
  position: relative; color: var(--ink-2); text-decoration: none; white-space: nowrap;
  font-size: var(--fs--1); font-weight: 500; padding: .4rem 0;
}
.site-nav a::after {
  content: ""; position: absolute; inset: auto 0 .1rem 0; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--ink); }

/* ---------- hero ---------- */
.hero { position: relative; padding-block: clamp(3rem, 7vw, 6.5rem) var(--section); isolation: isolate; overflow: clip; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: radial-gradient(circle, var(--line) 1px, transparent 1.2px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 65% 40%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 70% 80% at 65% 40%, #000 0%, transparent 70%);
  opacity: .9;
}
/* 背景の大きな輪（印影の外枠の形） */
.hero::after {
  content: ""; position: absolute; z-index: -1; pointer-events: none;
  width: min(52rem, 110vw); aspect-ratio: 1; right: -14rem; top: -10rem; border-radius: 50%;
  border: clamp(1.5rem, 3vw, 2.6rem) solid var(--shu); opacity: .06;
}
.hero .wrap { display: grid; gap: clamp(2.5rem, 6vw, 5rem); align-items: center; }
@media (min-width: 60em) { .hero .wrap { grid-template-columns: 1.05fr .95fr; } }
.hero h1 { font-size: clamp(2.2rem, .9rem + 4vw, 3.75rem); margin-top: var(--s0); line-height: 1.22; }
.accent { color: var(--accent); }
.hero .lead { font-size: var(--fs-1); color: var(--ink-2); max-width: 32em; margin-top: var(--s1); line-height: 1.8; }
.cta-row { display: flex; flex-wrap: wrap; gap: var(--s0); align-items: center; margin-top: var(--s2); }
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .85rem 1.3rem; border-radius: 999px; font-weight: 600; font-size: var(--fs-0);
  text-decoration: none; transition: transform .25s var(--ease), background .25s, border-color .25s;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { color: var(--ink); border-color: var(--line-2); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); }
.btn svg { width: 1.05em; height: 1.05em; }
@media (max-width: 30em) { .cta-row .btn { flex: 1 1 100%; justify-content: center; } }
.hero-note { margin-top: var(--s1); font-size: var(--fs--1); color: var(--muted); }

/* 見出し・本文の入場（一度きり） */
.enter { opacity: 0; transform: translateY(10px); animation: enter .8s var(--ease) forwards; animation-delay: var(--d, 0s); }
@keyframes enter { to { opacity: 1; transform: none; } }

/* ---------- demo（返信に印影を貼る） ---------- */
.demo { margin: 0; position: relative; padding-top: 3.25rem; }
.mail {
  position: relative; background: var(--card); color: #2a2522; border-radius: 1.1rem;
  box-shadow: 0 0 0 1px rgb(60 30 10 / .08), var(--shadow);
  font-size: .9375rem; line-height: 1.75; overflow: hidden;
  opacity: 0; transform: translateY(12px); animation: enter .8s var(--ease) forwards; animation-delay: .2s;
}
.mail .row { display: flex; gap: .6rem; padding: .7rem 1.2rem; border-bottom: 1px solid #efe9e2; color: #6f665e; }
.mail .row b { color: #2a2522; font-weight: 600; }
.mail .row.top { justify-content: space-between; font-size: .8125rem; letter-spacing: .04em; }
.mail .row.top .dots { display: flex; gap: .4rem; align-items: center; }
.mail .row.top .dots i { width: .6rem; height: .6rem; border-radius: 50%; background: #e3dbd2; display: block; }
.mail .body { padding: 1.1rem 1.2rem 1.3rem; }
.mail .body p + p { margin-top: .15em; }
.mail .quote { margin-top: 1rem; padding-left: .8rem; border-left: 3px solid #e7e0d8; color: #766c63; font-size: .8125rem; }
.paste { position: relative; display: block; width: clamp(7rem, 26%, 9rem); margin: .7rem 0 .6rem; }
.paste img {
  display: block; width: 100%; height: auto;
  opacity: 0; transform: scale(1.3); filter: drop-shadow(0 10px 14px rgb(234 60 30 / .25));
  animation: press .55s cubic-bezier(.3, 1.4, .5, 1) forwards; animation-delay: 1.75s;
}
@keyframes press { 60% { opacity: 1; transform: scale(.96); filter: drop-shadow(0 2px 3px rgb(234 60 30 / .25)); } to { opacity: 1; transform: none; filter: none; } }
/* 押した瞬間の波紋（飾り。印影そのものには加工しない） */
.paste::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%; border: 2px solid var(--shu);
  opacity: 0; animation: ripple .7s var(--ease) forwards; animation-delay: 2.05s; pointer-events: none;
}
@keyframes ripple { 0% { opacity: .5; transform: scale(.9); } 100% { opacity: 0; transform: scale(1.45); } }
.toast {
  position: absolute; z-index: 2; right: clamp(.25rem, 2vw, 1rem); top: 0;
  display: inline-flex; align-items: center; gap: .5rem;
  background: #2f2926; color: #fbf5ee; font-size: .8125rem; line-height: 1.4;
  padding: .6rem .95rem .6rem .75rem; border-radius: .8rem; box-shadow: 0 10px 28px -10px rgb(0 0 0 / .45);
  opacity: 0; transform: translateY(8px); animation: enter .6s var(--ease) forwards; animation-delay: 1.1s;
}
.toast svg { width: 1rem; height: 1rem; color: #ff9b80; flex: none; }
.demo figcaption { margin-top: var(--s1); font-size: var(--fs--1); color: var(--muted); line-height: 1.7; }
@media (prefers-reduced-motion: reduce) {
  .enter, .mail, .toast, .paste img { animation: none; opacity: 1; transform: none; filter: none; }
  .paste::after { display: none; }
}

/* ---------- sections ---------- */
section { padding-block: var(--section); }
section + section { padding-top: 0; }
.band + section { padding-top: var(--section); }
.section-head { margin-bottom: var(--s3); }
.section-head p { margin-top: var(--s0); color: var(--ink-2); max-width: var(--prose); }

/* how（使い方） */
.how { display: grid; gap: clamp(2.5rem, 6vw, 5rem); align-items: center; }
@media (min-width: 56em) { .how { grid-template-columns: 1.1fr .9fr; } }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s1); counter-reset: step; }
.steps li { display: grid; grid-template-columns: 3.25rem 1fr; gap: var(--s0); align-items: start; }
.steps .n {
  width: 3.25rem; height: 3.25rem; border-radius: 50%; display: grid; place-items: center;
  border: 2px solid var(--shu); color: var(--accent); font-family: var(--round); font-weight: 800; font-size: 1.15rem;
  background: var(--paper);
}
.steps h3 { margin-top: .45rem; }
.steps p { margin-top: .35rem; color: var(--ink-2); line-height: 1.8; }
.phone-shot { margin: 0; justify-self: center; width: min(21rem, 78vw); position: relative; }
.phone-shot img { display: block; width: 100%; height: auto; filter: drop-shadow(0 30px 40px rgb(60 30 10 / .18)); }
.phone-shot figcaption { margin-top: var(--s0); text-align: center; font-size: var(--fs--1); color: var(--muted); }

/* features */
.features { display: grid; gap: var(--s0); list-style: none; margin: 0; padding: 0; }
@media (min-width: 48em) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 72em) { .features { grid-template-columns: repeat(3, 1fr); } }
.card {
  position: relative; padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper);
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-2); box-shadow: var(--shadow); }
.card .head { display: flex; align-items: center; justify-content: space-between; gap: var(--s0); }
.card .ico { width: 2.75rem; height: 2.75rem; display: grid; place-items: center; border-radius: .85rem; background: var(--accent-soft); color: var(--accent); }
.card .ico svg { width: 1.5rem; height: 1.5rem; }
.card .num { font-family: var(--mono); font-size: .8rem; letter-spacing: .1em; color: var(--muted); }
.card h3 { margin-top: 1rem; }
.card p { margin-top: .75rem; color: var(--ink-2); font-size: var(--fs-0); line-height: 1.8; }

/* gallery（印影の見本） */
.gallery { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s0); grid-template-columns: repeat(2, 1fr); }
@media (min-width: 40em) { .gallery { grid-template-columns: repeat(4, 1fr); } }
.gallery li {
  display: grid; justify-items: center; gap: .6rem; padding: clamp(1rem, 3vw, 1.6rem) .75rem 1rem;
  background: var(--card); border-radius: var(--radius); box-shadow: 0 0 0 1px rgb(60 30 10 / .06);
}
.gallery img { width: min(9rem, 100%); height: auto; }
.gallery span { font-size: var(--fs--1); color: #5b534c; text-align: center; line-height: 1.5; }
.gallery-note { margin-top: var(--s1); font-size: var(--fs--1); color: var(--muted); }

/* band（通信しません） */
.band { background: var(--band-bg); color: var(--band-fg); padding-block: var(--section); }
.band .wrap { display: grid; gap: var(--s3); }
@media (min-width: 60em) { .band .wrap { grid-template-columns: 1.1fr .9fr; align-items: start; } }
.band .eyebrow { color: var(--band-fg-2); }
.band .big { font-size: var(--fs-4); line-height: 1.16; letter-spacing: -.02em; }
.band .big .thin { font-weight: 500; opacity: .6; font-size: .62em; line-height: 1.5; display: inline-block; margin-top: .4em; }
.band p { color: var(--band-fg-2); }
.band a { color: inherit; }
.proof { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.proof li { display: grid; grid-template-columns: 1.25rem 1fr; gap: .9rem; align-items: start; padding: var(--s0) 0; border-top: 1px solid rgb(128 128 128 / .35); border-top-color: color-mix(in srgb, var(--band-fg) 18%, transparent); }
.proof li:last-child { border-bottom: 1px solid rgb(128 128 128 / .35); border-bottom-color: color-mix(in srgb, var(--band-fg) 18%, transparent); }
.proof .mark { width: 1.25rem; height: 1.25rem; margin-top: .45rem; color: var(--shu); }
.proof b { display: block; font-weight: 700; color: var(--band-fg); }
.proof span { color: var(--band-fg-2); font-size: var(--fs--1); line-height: 1.7; }

/* spec（定義リスト） */
.spec { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 0 var(--s2); border-top: 1px solid var(--line); }
.spec dt, .spec dd { margin: 0; padding: .9rem 0; border-bottom: 1px solid var(--line); }
.spec dt { color: var(--muted); font-size: var(--fs--1); white-space: nowrap; }
.spec dd { color: var(--ink-2); }
@media (max-width: 32em) { .spec { grid-template-columns: 1fr; } .spec dt { padding-bottom: 0; border: 0; } }

/* note */
.note {
  display: grid; grid-template-columns: 1.25rem 1fr; gap: .8rem; align-items: start;
  background: var(--warn-soft); border-left: 3px solid var(--warn); border-radius: .6rem;
  padding: .95rem 1.1rem; font-size: var(--fs--1); line-height: 1.75; color: var(--ink-2);
}
.note svg { width: 1.25rem; height: 1.25rem; color: var(--warn); margin-top: .25rem; }
.note b { color: var(--warn); }

/* ---------- doc pages ---------- */
.doc-head { padding-block: clamp(2.5rem, 6vw, 5rem) var(--s3); border-bottom: 1px solid var(--line); }
.doc-head h1 { font-size: var(--fs-3); margin-top: var(--s0); }
.doc-head .meta { margin-top: var(--s0); font-size: var(--fs--1); color: var(--muted); }
.doc { display: grid; gap: var(--s4); padding-block: var(--s3) var(--section); }
@media (min-width: 60em) { .doc { grid-template-columns: 14rem minmax(0, var(--prose)); gap: var(--s4); } }
.toc { position: sticky; top: 5rem; align-self: start; font-size: var(--fs--1); }
.toc .k { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; color: var(--muted); margin-bottom: .5rem; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc a { display: block; padding: .3rem 0 .3rem .9rem; color: var(--ink-2); text-decoration: none; border-left: 2px solid transparent; margin-left: -1px; }
.toc a:hover { color: var(--ink); border-left-color: var(--line-2); }
.toc a[aria-current="location"] { color: var(--ink); border-left-color: var(--accent); }
@media (max-width: 59.99em) { .toc { position: static; } .toc ol { display: flex; flex-wrap: wrap; gap: .25rem .9rem; border: 0; } .toc a { padding: .2rem 0; border: 0; margin: 0; } }
.doc article h2 { font-family: var(--font); font-weight: 700; font-size: var(--fs-2); margin-top: var(--s4); padding-top: var(--s2); border-top: 1px solid var(--line); scroll-margin-top: 5rem; }
.doc article h2:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.doc article h2 + p, .doc article h2 + .summary, .doc article h2 + dl, .doc article h2 + details { margin-top: var(--s0); }
.doc article p + .note, .doc article dl + p, .doc article p + dl, .doc article .note + p { margin-top: var(--s1); }
.summary { padding: clamp(1.2rem, 3vw, 1.75rem); border-radius: var(--radius); background: var(--paper-2); }
.summary ul { margin: .5rem 0 0; padding-left: 1.2em; }
.summary li + li { margin-top: .35rem; }

/* contact */
.contact { padding: clamp(1.4rem, 3vw, 2rem); border-radius: var(--radius); border: 1px solid var(--line); background: var(--paper-2); }
.contact .addr { font-size: var(--fs-2); font-weight: 700; letter-spacing: -.01em; margin-top: .35rem; word-break: break-all; }
.contact .addr a { color: var(--ink); text-decoration-color: var(--accent); }
.contact p.small { margin-top: var(--s0); font-size: var(--fs--1); color: var(--muted); }

/* faq */
.faq { display: grid; gap: .5rem; margin-top: var(--s1); }
details { border: 1px solid var(--line); border-radius: .9rem; background: var(--paper); transition: border-color .3s; }
details[open] { border-color: var(--line-2); }
details { interpolate-size: allow-keywords; }
details::details-content { block-size: 0; overflow: hidden; transition: block-size .4s var(--ease), content-visibility .4s allow-discrete; }
details[open]::details-content { block-size: auto; }
summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: 1fr 1.5rem; gap: var(--s0); align-items: center;
  padding: 1rem 1.2rem; font-weight: 600; line-height: 1.6;
}
summary::-webkit-details-marker { display: none; }
summary .plus { width: 1.5rem; height: 1.5rem; border-radius: 50%; border: 1px solid var(--line-2); display: grid; place-items: center; transition: transform .35s var(--ease), background .3s; }
summary .plus svg { width: .8rem; height: .8rem; }
details[open] summary .plus { transform: rotate(45deg); background: var(--ink); color: var(--paper); border-color: var(--ink); }
details .body { padding: 0 1.2rem 1.1rem; color: var(--ink-2); }
details .body p + p { margin-top: .6em; }
.faq-group { margin-top: var(--s2); font-size: var(--fs--1); font-weight: 700; color: var(--muted); letter-spacing: .06em; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: var(--s3) var(--s4); font-size: var(--fs--1); color: var(--muted); }
.site-footer .wrap { display: grid; gap: var(--s1); }
@media (min-width: 48em) { .site-footer .wrap { grid-template-columns: 1fr auto; align-items: end; } }
.site-footer .brand { color: var(--ink); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: var(--s1); }
.site-footer nav a { color: var(--muted); text-decoration: none; }
.site-footer nav a:hover { color: var(--ink); }
.site-footer .tag { margin-top: .5rem; }

/* ---------- scroll reveal（JSがあるときだけ・無ければ常に表示） ---------- */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- 404 ---------- */
.lost { min-height: 70vh; display: grid; place-items: center; text-align: center; padding-block: var(--section); }
.lost .mark { width: 6rem; height: 6rem; margin-inline: auto; border-radius: 22.5%; box-shadow: 0 0 0 1px var(--line), var(--shadow); }
.lost h1 { font-size: var(--fs-3); margin-top: var(--s1); }
.lost p { margin-top: var(--s0); color: var(--ink-2); }

/* ---------- print（プライバシーポリシーを印刷・PDF化する人向け） ---------- */
@media print {
  :root { --paper: #fff; --paper-2: #f4f4f4; --ink: #000; --ink-2: #222; --muted: #555; --line: #ccc; --warn-soft: #fafafa; --warn: #333; }
  .site-header, .site-footer, .toc, .skip { display: none !important; }
  body { font-size: 11pt; line-height: 1.6; }
  .doc { display: block; }
  a { color: inherit; text-decoration: none; }
  .summary { border: 1px solid #ccc; }
}