:root {
  --cream: #fbf5ea;
  --paper: #fffdf8;
  --latte: #f1e3cd;
  --ink: #4a3426;
  --ink-soft: #6b5242;
  --accent: #8a4b1f;
  --accent-dark: #6f3a14;
  --board: #2f3e36;
  --board-deep: #263229;
  --board-ink: #f6ecd9;
  --board-dim: #a9b8a8;
  --chalk-gold: #e8c99a;
  --chalk-pink: #f2b8a8;
  --line: #e3d3b9;
  --radius: 18px;
  --shadow: 0 6px 18px rgba(74, 52, 38, .10);
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Zen Maru Gothic", "Hiragino Maru Gothic ProN", "Hiragino Sans", "Yu Gothic", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Noto Sans Mono", "Hiragino Sans", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.9;
  -webkit-text-size-adjust: 100%;
}
h1, h2, h3 { font-family: var(--serif); line-height: 1.4; margin: 0; }
p { margin: 0 0 1em; }
a { color: var(--accent); }
a:focus-visible, .btn:focus-visible, button:focus-visible, summary:focus-visible,
input:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--ink); color: var(--cream); padding: .6rem 1rem; border-radius: 8px;
}
.skip:focus { top: 1rem; }
.sp-only { display: none; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .6rem 16px;
  background: rgba(251, 245, 234, .94);
  backdrop-filter: blur(6px);
  border-bottom: 1px dashed var(--line);
}
.brand { display: flex; align-items: center; gap: .5rem; text-decoration: none; color: var(--ink); }
.brand-cup { font-size: 1.5rem; }
.brand-text { font-family: var(--serif); font-weight: 700; font-size: 1.1rem; line-height: 1.25; }
.brand-text small { display: block; font-size: .68rem; color: var(--ink-soft); letter-spacing: .1em; font-weight: 500; }
.header-right { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: .3rem .6rem; }
.site-header ul { display: flex; flex-wrap: wrap; gap: .2rem; list-style: none; margin: 0; padding: 0; }
.site-header nav a {
  display: inline-block; padding: .5rem .8rem; text-decoration: none;
  color: var(--ink); font-size: .9rem; border-radius: 999px;
}
.site-header nav a:hover { background: var(--latte); }

/* 言語ボタンと選択画面 */
.lang-btn {
  display: inline-flex; align-items: center; gap: .35rem;
  min-height: 40px; padding: .4rem 1rem;
  font: inherit; font-size: .85rem; font-weight: 700; color: var(--accent);
  background: var(--paper); border: 2px solid var(--accent); border-radius: 999px;
  cursor: pointer; transition: background .2s ease;
}
.lang-btn:hover { background: var(--latte); }
.lang-btn:focus-visible, .lang-close:focus-visible, .lang-list button:focus-visible {
  outline: 3px solid var(--accent); outline-offset: 3px;
}
.lang-dialog {
  width: min(92vw, 400px); max-height: 90vh; overflow-y: auto; padding: 0; color: var(--ink);
  background: var(--paper); border: 2px dashed var(--line); border-radius: var(--radius);
  box-shadow: 0 16px 40px rgba(74, 52, 38, .28);
}
.lang-dialog::backdrop { background: rgba(74, 52, 38, .45); }
.lang-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.1rem 1.2rem .5rem; }
.lang-head h2 { font-size: 1.15rem; letter-spacing: .06em; }
.lang-close {
  min-height: 40px; padding: .3rem 1rem; font: inherit; font-size: .85rem; font-weight: 700;
  color: var(--ink); background: var(--latte); border: 0; border-radius: 999px; cursor: pointer;
}
.lang-close:hover { background: var(--line); }
.lang-list { list-style: none; margin: 0; padding: .4rem 1.2rem 1.3rem; display: grid; gap: .6rem; }
.lang-list button {
  display: flex; align-items: center; justify-content: space-between; gap: .8rem;
  width: 100%; min-height: 48px; padding: .6rem 1.1rem;
  font: inherit; font-size: 1.02rem; font-weight: 700; color: var(--ink);
  background: #fff; border: 2px solid var(--line); border-radius: 14px; cursor: pointer;
}
.lang-list button:hover { background: var(--latte); }
.lang-list button[aria-current="true"] { background: var(--latte); border-color: var(--accent); }
.lang-list button[aria-current="true"]::after { content: "✓"; color: var(--accent); }
html:has(dialog[open]) { overflow: hidden; }

/* 言語ごとの書体と文字組み */
html:lang(ko) { --sans: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; --serif: "Noto Serif KR", "Apple SD Gothic Neo", "Malgun Gothic", serif; }
html:lang(zh-Hans) { --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; --serif: "Noto Serif SC", "Songti SC", "SimSun", serif; }
html:lang(zh-Hant) { --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif; --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif; }
html:lang(ko) body { word-break: keep-all; }
html:not(:lang(ja)) .hero h1 span:not(.h1-main) { letter-spacing: .04em; }
html:not(:lang(ja)) .brand-text small { letter-spacing: .04em; }
html:not(:lang(ja)) .results-bar h2, html:not(:lang(ja)) .section-head h2 { letter-spacing: .03em; }

/* hero */
.hero {
  text-align: center;
  padding: 3.2rem 16px 4.4rem;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.7), transparent 40%),
    linear-gradient(180deg, var(--latte), var(--cream));
}
.steam { display: flex; justify-content: center; gap: 12px; height: 32px; margin-bottom: .4rem; }
.steam span {
  width: 5px; height: 32px; border-radius: 999px;
  background: linear-gradient(to top, rgba(138,75,31,.35), transparent);
  animation: steam 3.2s ease-in-out infinite;
}
.steam span:nth-child(2) { animation-delay: .8s; height: 40px; }
.steam span:nth-child(3) { animation-delay: 1.6s; }
@keyframes steam {
  0%   { opacity: 0; transform: translateY(10px) scaleX(1); }
  50%  { opacity: 1; }
  100% { opacity: 0; transform: translateY(-12px) scaleX(1.8); }
}
.hero h1 { font-size: clamp(2.2rem, 8vw, 3.6rem); letter-spacing: .06em; }
.hero h1 span:not(.h1-main) {
  display: block; margin-top: .5em; font-size: clamp(.9rem, 3.4vw, 1.1rem);
  letter-spacing: .2em; color: var(--accent); font-weight: 500;
}
.lead { margin: 1.2rem auto 0; max-width: 34em; color: var(--ink-soft); }

/* tool */
.tool { max-width: 820px; margin: -2.4rem auto 0; padding: 0 16px; position: relative; }
.tabs { display: flex; gap: .4rem; padding-left: .4rem; }
.tabs button {
  min-height: 46px; padding: .5rem 1.3rem;
  font: inherit; font-size: .95rem; font-weight: 700; color: var(--ink-soft);
  background: var(--latte); border: 2px dashed var(--line); border-bottom: 0;
  border-radius: 14px 14px 0 0; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--paper); color: var(--accent); }
.panel {
  padding: 1.6rem 1.5rem 1.8rem; background: var(--paper);
  border: 2px dashed var(--line); border-radius: 0 var(--radius) var(--radius) var(--radius);
  box-shadow: var(--shadow);
}
.panel[hidden] { display: none; }
.field { margin: 0 0 1.4rem; padding: 0; border: 0; min-width: 0; }
.field > label, .field > legend {
  display: block; padding: 0; margin-bottom: .5rem;
  font-weight: 700; font-size: .95rem;
}
.hint { margin-left: .7em; font-size: .78rem; font-weight: 500; color: var(--ink-soft); }
.field textarea, .line, .custom-ip {
  width: 100%; padding: .7rem .9rem;
  font: inherit; font-family: var(--mono); font-size: 1rem; line-height: 1.6; color: var(--ink);
  background: #fff; border: 2px solid var(--line); border-radius: 12px;
}
.field textarea { resize: vertical; min-height: 7.2em; }
.custom-ip { margin-top: .7rem; }
.custom-ip[hidden] { display: none; }
.note { margin: .7rem 0 0; font-size: .82rem; color: var(--ink-soft); line-height: 1.7; }

.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.chip span {
  display: inline-flex; align-items: center; min-height: 40px; padding: .3rem 1rem;
  font-size: .9rem; font-weight: 700; color: var(--ink);
  background: #fff; border: 2px solid var(--line); border-radius: 999px;
  transition: background .15s ease, border-color .15s ease;
}
.chip:hover span { background: var(--latte); }
.chip input:checked + span { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 3px; }
.opts { display: flex; flex-wrap: wrap; gap: .4rem 1.6rem; }
.check { display: inline-flex; align-items: center; gap: .5rem; min-height: 40px; font-size: .92rem; cursor: pointer; }
.check input { width: 20px; height: 20px; accent-color: var(--accent); }

.btn {
  display: inline-block; padding: .85rem 2rem; min-height: 48px;
  font: inherit; font-weight: 700; letter-spacing: .08em; color: #fff;
  background: var(--accent); border: 0; border-radius: 999px; cursor: pointer;
  box-shadow: var(--shadow); transition: background .2s ease, transform .2s ease;
}
.btn:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn:active { transform: none; }
.btn:disabled { opacity: .6; cursor: progress; transform: none; }
.btn.go { min-width: 10em; }

/* results: 黒板 */
.results { max-width: 820px; margin: 2.4rem auto 0; padding: 0 16px; scroll-margin-top: 5rem; }
.results[hidden] { display: none; }
.results-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .9rem; }
.results-bar h2 { font-size: 1.3rem; letter-spacing: .1em; }
.mini {
  min-height: 40px; padding: .3rem 1rem; font: inherit; font-size: .85rem; font-weight: 700;
  color: var(--accent); background: var(--paper); border: 2px solid var(--accent);
  border-radius: 999px; cursor: pointer;
}
.mini:hover { background: var(--latte); }

.board {
  margin: 0 0 1.2rem; color: var(--board-ink); background: var(--board);
  border: 3px solid #c9a97a; border-radius: 10px; outline: 2px solid rgba(246,236,217,.22); outline-offset: -10px;
  box-shadow: var(--shadow);
}
.board-head {
  display: flex; align-items: center; justify-content: space-between; gap: .8rem;
  padding: .9rem 1.4rem .3rem;
}
.board-title { font-family: var(--mono); font-size: .95rem; font-weight: 700; color: var(--chalk-gold); word-break: break-all; }
.chalk-btn {
  flex: none; min-height: 36px; padding: .2rem .9rem; font: inherit; font-size: .8rem; font-weight: 700;
  color: var(--board-ink); background: transparent; border: 1.5px solid rgba(246,236,217,.55); border-radius: 999px; cursor: pointer;
}
.chalk-btn:hover { background: rgba(246,236,217,.14); }
.chalk-btn:focus-visible { outline: 3px solid var(--chalk-gold); outline-offset: 2px; }
.board pre {
  margin: 0; padding: .5rem 1.4rem 1.3rem;
  font-family: var(--mono); font-size: .84rem; line-height: 1.75;
  white-space: pre; overflow-x: auto; tab-size: 4;
}
.board pre.wrap { white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere; }
.board .meta { color: var(--board-dim); }
.board .sec { color: var(--chalk-gold); }
.board .ty { color: var(--chalk-gold); }
.board .ttl { color: var(--board-dim); }
.board .ok { color: #b9e0a5; }
.board .err { color: var(--chalk-pink); }
.board .val { color: var(--board-ink); }
.board-state { padding: .6rem 1.4rem 1.3rem; font-size: .92rem; color: var(--board-dim); }
.board-state.err { color: var(--chalk-pink); }
.board-state .dots::after { content: ""; animation: dots 1.2s steps(4) infinite; }
@keyframes dots { 0% { content: ""; } 25% { content: "."; } 50% { content: ".."; } 75% { content: "..."; } }

/* guide */
.section-head { text-align: center; margin-bottom: 2rem; }
.section-head h2 { font-size: clamp(1.4rem, 4.5vw, 1.9rem); letter-spacing: .1em; margin-bottom: .6rem; }
.section-head p { color: var(--ink-soft); margin: 0; }
.guide { max-width: 820px; margin: 0 auto; padding: 4.5rem 16px 4.5rem; }
.guide-body { display: grid; gap: .8rem; }
.guide details {
  background: var(--paper); border: 2px dashed var(--line); border-radius: 14px; padding: 0 1.3rem;
}
.guide summary {
  min-height: 52px; display: flex; align-items: center; cursor: pointer;
  font-family: var(--serif); font-weight: 700; font-size: 1.05rem;
}
.guide details[open] summary { margin-bottom: .2rem; }
.guide details > :last-child { margin-bottom: 1.2rem; }
.guide ul { margin: 0; padding-left: 1.3em; }
.guide li { margin-bottom: .3em; }
.guide dl { margin: 0; display: grid; grid-template-columns: minmax(5.5em, auto) 1fr; gap: .5rem 1rem; }
.guide dt { font-family: var(--mono); font-weight: 700; color: var(--accent); }
.guide dd { margin: 0; }
.guide code { font-family: var(--mono); background: var(--latte); padding: .05em .4em; border-radius: 6px; font-size: .9em; }

.site-footer { text-align: center; padding: 2rem 16px 2.5rem; background: var(--latte); font-size: .85rem; color: var(--ink-soft); }
.site-footer p { margin-bottom: .3rem; }

@media (max-width: 560px) {
  .sp-only { display: inline; }
  .site-header { padding-block: .5rem; }
  /* ロゴと言語ボタンを1段目、ナビを2段目にして、固定ヘッダーを低く保つ */
  .site-header { flex-wrap: wrap; row-gap: .1rem; }
  .header-right { display: contents; }
  .brand { order: 1; }
  .lang-btn { order: 2; }
  .site-header nav { order: 3; flex-basis: 100%; }
  .site-header ul { justify-content: center; }
  .brand-text { font-size: 1rem; }
  .site-header nav a { padding: .4rem .55rem; font-size: .85rem; }
  .hero { padding: 2.4rem 16px 4rem; }
  .panel { padding: 1.3rem 1rem 1.5rem; }
  .hint { display: block; margin: .15rem 0 0; }
  .board-head, .board pre, .board-state { padding-inline: 1rem; }
  .board pre { font-size: .78rem; }
  .guide { padding-block: 3.5rem; }
  .guide dl { grid-template-columns: 1fr; gap: 0; }
  .guide dd { margin-bottom: .7rem; }
  .btn.go { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* 解説記事 */
.guide-more { margin: 1.4rem 0 0; text-align: center; }
.article { max-width: 720px; margin: 0 auto; padding: 1.6rem 16px 4.5rem; }
.crumbs { font-size: .82rem; color: var(--ink-soft); margin-bottom: 1.2rem; }
.crumbs a { color: var(--ink-soft); }
.article h1 { font-size: clamp(1.6rem, 5.5vw, 2.2rem); letter-spacing: .04em; margin-bottom: 1rem; }
.article h2 {
  font-size: clamp(1.2rem, 4vw, 1.45rem); margin: 2.6rem 0 .9rem; padding-bottom: .4rem;
  border-bottom: 2px dashed var(--line);
}
.article p, .article li, .article dd { max-width: 40em; }
.article ul, .article ol { padding-left: 1.4em; margin: 0 0 1em; }
.article li { margin-bottom: .35em; }
.art-lead { font-size: 1.05rem; color: var(--ink-soft); }
.article code { font-family: var(--mono); background: var(--latte); padding: .05em .4em; border-radius: 6px; font-size: .9em; overflow-wrap: anywhere; }
.article pre.cmd {
  margin: 0 0 1.2rem; padding: 1rem 1.2rem; overflow-x: auto;
  font-family: var(--mono); font-size: .85rem; line-height: 1.75;
  color: var(--board-ink); background: var(--board); border: 3px solid #c9a97a; border-radius: 10px;
}
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin: 1.4rem 0; }
.cta span { font-size: .85rem; color: var(--ink-soft); }
.rec { display: grid; grid-template-columns: minmax(5.5em, auto) 1fr; gap: .7rem 1rem; margin: 0 0 1em; }
.rec dt { font-family: var(--mono); font-weight: 700; color: var(--accent); }
.rec dd { margin: 0; }
.faq { display: grid; gap: .7rem; }
.faq details { background: var(--paper); border: 2px dashed var(--line); border-radius: 14px; padding: 0 1.2rem; }
.faq summary { min-height: 48px; display: flex; align-items: center; cursor: pointer; font-weight: 700; }
.faq details p { margin: 0 0 1rem; }
.more-list { list-style: none; padding: 0 !important; }
.updated { margin-top: 2.4rem; font-size: .82rem; color: var(--ink-soft); }
.guide-list { list-style: none; margin: 1.6rem 0 0; padding: 0 !important; display: grid; gap: 1rem; }
.guide-list a {
  display: block; padding: 1.1rem 1.3rem; text-decoration: none; color: var(--ink);
  background: var(--paper); border: 2px dashed var(--line); border-radius: var(--radius);
}
.guide-list a:hover { background: var(--latte); }
.guide-list strong { display: block; font-family: var(--serif); font-size: 1.1rem; color: var(--accent); margin-bottom: .2rem; }
.guide-list span { font-size: .9rem; color: var(--ink-soft); }
@media (max-width: 560px) {
  .rec { grid-template-columns: 1fr; gap: 0; }
  .rec dd { margin-bottom: .8rem; }
}

/* アクセスカウンター（文字だけ） */
.counter {
  display: inline-flex; align-items: baseline; gap: .9rem; margin: 1.4rem 0 0;
  font-size: .82rem; letter-spacing: .08em; color: var(--ink-soft);
}
.counter[hidden] { display: none; }
.counter .num {
  position: relative; padding-left: .9rem;
  font-family: var(--serif); font-size: 1.5rem; font-weight: 700; line-height: 1;
  letter-spacing: .02em; color: var(--accent); font-variant-numeric: tabular-nums lining-nums;
}
.counter .num::before {
  content: ""; position: absolute; left: 0; top: .1em; bottom: .05em; width: 1px; background: var(--line);
}

/* 説明書ページの言語切り替え */
.langs { display: flex; flex-wrap: wrap; gap: .3rem .5rem; max-width: 720px; margin: 0 auto; padding: .7rem 16px 0; font-size: .82rem; }
.langs a {
  padding: .25rem .8rem; color: var(--ink-soft); text-decoration: none;
  border: 1.5px solid var(--line); border-radius: 999px; background: var(--paper);
}
.langs a:hover { background: var(--latte); }
.langs a[aria-current="true"] { color: var(--accent); border-color: var(--accent); font-weight: 700; }