/*
 * 配色は 4 色。地はクリーム、いちばん目立つ面積をオレンジに割り当て、
 * 水色と緑は図形の重ね色や番号などの差し色に使う。
 */
:root {
  --orange: #f0a260;
  --cream: #fdf7db;
  --cyan: #60cbd5;
  --green: #7fdd87;

  --bg: var(--cream);
  --ink: #3b2a1f;
  --ink-soft: #7a6555;
  --line: rgba(59, 42, 31, 0.22);
  --accent-text: #1a6f77; /* 水色を文字に使うときの濃い色。クリームの地で読める濃さにしている */
  --paper: #fffdf4;

  --content: 1080px;
  --gutter: 24px;
  --header-h: 76px;

  --sans: "DM Sans", "Noto Sans JP", "Hiragino Sans", system-ui, sans-serif;
  --serif-en: "Playfair Display", "Noto Serif JP", serif;
  --serif-ja: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;

  --blob-a: 58% 42% 52% 48% / 46% 56% 44% 54%;
  --blob-b: 44% 56% 38% 62% / 58% 40% 60% 42%;
  --blob-c: 52% 48% 64% 36% / 40% 58% 42% 60%;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.95;
  letter-spacing: 0.02em;
}

body.menu-open {
  overflow: hidden;
}

main,
.site-footer {
  overflow-x: clip;
}

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

a {
  color: inherit;
  text-underline-offset: 4px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(59, 42, 31, 0.07);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  overflow-wrap: anywhere;
}

kbd {
  font-family: var(--sans);
  font-size: 0.85em;
  padding: 0.05em 0.45em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--paper);
}

.container {
  width: 100%;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* 字間を空けた小さな英字のラベル */
.label {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

/* ── ヘッダー ────────────────────────── */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  height: var(--header-h);
  background: rgba(253, 247, 219, 0.88);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand img {
  width: 34px;
  height: 34px;
}

.brand span {
  font-family: var(--serif-en);
  font-size: 1.05rem;
  letter-spacing: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-actions .label {
  text-decoration: none;
}

.menu-button {
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: transparent;
  color: var(--ink);
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.menu-button[aria-expanded="true"] span {
  box-shadow: none;
  transform: rotate(45deg);
}

.menu-button[aria-expanded="true"] span::after {
  content: "";
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  transform: rotate(90deg);
}

/* 全画面のメニュー */
.menu {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: var(--bg);
  padding: calc(var(--header-h) + 32px) var(--gutter) 40px;
  display: none;
  overflow-y: auto;
}

.menu.is-open {
  display: block;
}

.menu ul {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.menu li + li {
  border-top: 1px solid var(--line);
}

.menu a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  text-decoration: none;
}

.menu a strong {
  font-family: var(--serif-en);
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.menu a small {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ── 図形 ────────────────────────────── */
.blob {
  border-radius: var(--blob-a);
}

.blob-stack {
  position: relative;
}

/* 後ろの図形（z-index: -1）を色の図形の下に描くため、重ねる範囲をここで区切る */
.hero-visual,
.feature-visual {
  isolation: isolate;
}

/* 後ろにずらして重ねる色の図形 */
.blob-stack::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: var(--blob-b);
  transform: translate(5%, 4%) rotate(6deg);
  background: var(--shadow-color, var(--cyan));
  opacity: 0.55;
}

/* 図形に沿って曲げる英字 */
.curve-label {
  position: absolute;
  inset: -6%;
  width: 112%;
  height: 112%;
  pointer-events: none;
  overflow: visible;
}

.curve-label text {
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0.3em;
  fill: var(--ink);
  text-transform: uppercase;
}

/* ── ヒーロー ────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  padding: calc(var(--header-h) + 24px) 0 32px;
  display: flex;
  flex-direction: column;
}

.hero .container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.hero-visual {
  position: relative;
  flex: 1;
  display: grid;
  place-items: center;
  min-height: 460px;
}

.hero-blob {
  position: absolute;
  width: min(86vw, 720px);
  aspect-ratio: 1.12;
  background: var(--orange);
  --shadow-color: var(--cyan);
}

.hero-blob::after {
  content: "";
  position: absolute;
  width: 22%;
  aspect-ratio: 1;
  right: -2%;
  bottom: 8%;
  border-radius: var(--blob-c);
  background: var(--green);
}

.hero-title {
  position: relative;
  z-index: 2;
  margin: 0;
  text-align: center;
  font-family: var(--serif-en);
  font-weight: 400;
  font-size: clamp(3rem, 11vw, 7.5rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.hero-title em {
  display: block;
  font-style: italic;
  padding-left: 0.8em;
}

.hero-title small {
  display: block;
  margin-top: 28px;
  font-family: var(--serif-ja);
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: 0.06em;
}

.hero-meta {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: 16px;
  margin-top: 24px;
  font-size: 0.72rem;
}

.hero-meta p {
  margin: 0;
  line-height: 1.8;
}

.hero-meta .scroll {
  text-align: center;
  text-decoration: none;
}

.hero-meta .scroll::before {
  content: "";
  display: block;
  width: 8px;
  height: 8px;
  margin: 0 auto 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
}

.hero-meta .right {
  text-align: right;
}

/* ── セクション共通 ──────────────────── */
.section {
  padding: 120px 0;
}

.section-head {
  margin-bottom: 56px;
}

.section-head .label {
  color: var(--accent-text);
}

.section-head h2 {
  margin: 12px 0 0;
  font-family: var(--serif-ja);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.04em;
}

/* 紹介文 */
.intro {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.intro .label {
  margin-bottom: 28px;
  color: var(--accent-text);
}

.intro p.lead {
  margin: 0;
  font-family: var(--serif-ja);
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 2.2;
}

/* ── ボタンと矢印つきのリンク ─────────── */
.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 40px;
}

.actions--start {
  justify-content: flex-start;
  margin-top: 8px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 30px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.button--primary {
  background: var(--ink);
  color: var(--cream);
}

.button--primary:hover {
  background: transparent;
  color: var(--ink);
}

.button--ghost:hover {
  background: var(--ink);
  color: var(--cream);
}

.arrow-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 420px;
  margin-top: 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--accent-text);
  text-decoration: none;
}

.arrow-link::after {
  content: "\2197";
  font-size: 1rem;
  transition: transform 0.2s ease;
}

.arrow-link:hover::after {
  transform: translate(3px, -3px);
}

.release-meta {
  margin: 14px 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* ── 対訳 PDF の見本 ─────────────────── */
.sample {
  position: relative;
  z-index: 1;
  width: min(100%, 440px);
  margin: 0;
  background: var(--paper);
  border-radius: 6px;
  box-shadow: 0 24px 50px rgba(59, 42, 31, 0.16);
  padding: 22px 22px 18px;
  font-size: 0.8rem;
  line-height: 1.6;
  text-align: left;
  transform: rotate(-3deg);
}

.sample__head,
.sample__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.sample__head {
  padding-bottom: 8px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.sample__row {
  padding: 7px 0;
}

.sample__row + .sample__row {
  border-top: 1px dashed var(--line);
}

.sample__en {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.sample__caption {
  margin: 10px 0 0;
  font-size: 0.7rem;
  color: var(--ink-soft);
}

/* ── 特長 ────────────────────────────── */
.feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.feature + .feature {
  margin-top: 120px;
}

.feature-visual {
  position: relative;
  width: min(100%, 420px);
  margin: 0 auto;
}

.feature-blob {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 18%;
  text-align: center;
}

.feature-blob--orange {
  background: var(--orange);
  --shadow-color: var(--cyan);
}

.feature-blob--cyan {
  background: var(--cyan);
  border-radius: var(--blob-b);
  --shadow-color: var(--green);
}

.feature-blob--green {
  background: var(--green);
  border-radius: var(--blob-c);
  --shadow-color: var(--orange);
}

.feature-blob--sample {
  padding: 12% 4%;
}

.feature-blob .glyph {
  margin: 0;
  font-family: var(--serif-en);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.4;
}

.feature-blob .glyph small {
  display: block;
  margin-top: 6px;
  font-family: var(--serif-ja);
  font-size: 0.55em;
}

.feature-text .label {
  color: var(--accent-text);
}

.feature-text h3 {
  margin: 10px 0 16px;
  font-family: var(--serif-ja);
  font-size: clamp(1.3rem, 2.8vw, 1.7rem);
  font-weight: 500;
  line-height: 1.6;
}

.feature-text p {
  margin: 0;
  max-width: 460px;
}

@media (min-width: 820px) {
  .feature {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }

  .feature--reverse .feature-visual {
    order: 2;
  }
}

/* ── 手順の一覧 ──────────────────────── */
.rows {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.rows > li {
  border-bottom: 1px solid var(--line);
}

.rows a,
.rows .row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 8px 20px;
  align-items: baseline;
  padding: 28px 0;
  text-decoration: none;
}

.rows .num {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 2rem;
  line-height: 1;
  color: var(--accent-text);
}

.rows h3 {
  margin: 0;
  font-family: var(--serif-ja);
  font-size: 1.2rem;
  font-weight: 500;
}

.rows p {
  grid-column: 2 / 3;
  margin: 0;
  color: var(--ink-soft);
}

.rows a::after {
  content: "\2197";
  grid-column: 3;
  grid-row: 1;
  color: var(--accent-text);
  transition: transform 0.2s ease;
}

.rows a:hover::after {
  transform: translate(3px, -3px);
}

/* ── ダウンロード ────────────────────── */
.download {
  text-align: center;
}

.download-title {
  margin: 12px 0 8px;
  font-family: var(--serif-en);
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.download-title em {
  font-style: italic;
}

.download p {
  margin: 8px auto 0;
  max-width: 560px;
}

.download .note {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ── フッター ────────────────────────── */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--orange);
  padding: 40px 0 28px;
}

.footer-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 100%;
  display: block;
  width: 100%;
  height: 60px;
}

.footer-wave path {
  fill: var(--orange);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
}

.footer-mark {
  margin: 0;
  font-family: var(--serif-en);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.footer-mark em {
  font-style: italic;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 10px 48px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

.copyright {
  margin: 40px 0 0;
  font-size: 0.75rem;
}

/* ── 下層ページ ──────────────────────── */
.page-head {
  position: relative;
  padding: calc(var(--header-h) + 72px) 0 72px;
  overflow: hidden;
  isolation: isolate;
}

.page-head .container {
  position: relative;
  z-index: 1;
}

.page-head .label {
  color: var(--accent-text);
}

.page-head h1 {
  margin: 8px 0 0;
  font-family: var(--serif-en);
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-head h1 small {
  display: block;
  margin-top: 16px;
  font-family: var(--serif-ja);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 500;
  letter-spacing: 0.06em;
}

.page-head p {
  margin: 20px 0 0;
  max-width: 560px;
}

.page-head-blob {
  position: absolute;
  right: -60px;
  top: 40px;
  width: min(48vw, 380px);
  aspect-ratio: 1;
  background: var(--orange);
  --shadow-color: var(--green);
}

.page-head-blob--cyan {
  background: var(--cyan);
  border-radius: var(--blob-b);
  --shadow-color: var(--orange);
}

.page-head-blob--green {
  background: var(--green);
  border-radius: var(--blob-c);
  --shadow-color: var(--cyan);
}

.page-body {
  padding: 24px 0 40px;
}

.prose {
  max-width: 720px;
}

.prose h2 {
  margin: 88px 0 20px;
  font-family: var(--serif-ja);
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 500;
  line-height: 1.6;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h2 .label {
  display: block;
  margin-bottom: 6px;
  color: var(--accent-text);
}

.prose h3 {
  margin: 40px 0 12px;
  font-family: var(--serif-ja);
  font-size: 1.15rem;
  font-weight: 500;
}

.prose p,
.prose ul,
.prose ol {
  margin: 0 0 18px;
}

.prose ol > li,
.prose ul > li {
  margin-bottom: 8px;
}

.prose ol {
  padding-left: 1.4em;
}

.prose ol > li::marker {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent-text);
}

.callout {
  position: relative;
  margin: 0 0 28px;
  padding: 24px 28px;
  background: var(--paper);
  border-radius: 28px;
}

.callout::before {
  content: "";
  position: absolute;
  left: -10px;
  top: -10px;
  width: 28px;
  height: 28px;
  border-radius: var(--blob-c);
  background: var(--orange);
}

.callout p:last-child {
  margin-bottom: 0;
}

.placeholder {
  display: grid;
  place-items: center;
  min-height: 220px;
  margin: 0 0 28px;
  border: 1px dashed var(--line);
  border-radius: var(--blob-b);
  color: var(--ink-soft);
  font-size: 0.8rem;
  text-align: center;
  padding: 24px;
}

.screenshot {
  margin: 0 0 28px;
}

.screenshot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  box-shadow: 0 18px 40px rgba(59, 42, 31, 0.14);
}

.screenshot figcaption {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.spec {
  margin: 0 0 24px;
  border-top: 1px solid var(--line);
}

.spec div {
  display: grid;
  grid-template-columns: 7em 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.spec dt {
  font-weight: 500;
}

.spec dd {
  margin: 0;
}

/* よくある質問 */
.faq-group + .faq-group {
  margin-top: 72px;
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq-group h2 + details {
  border-top: 1px solid var(--line);
}

.faq summary {
  position: relative;
  display: block;
  padding: 22px 40px 22px 0;
  font-family: var(--serif-ja);
  font-size: 1.05rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--sans);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--accent-text);
}

.faq details[open] summary::after {
  content: "\2212";
}

.faq .answer {
  padding: 0 0 24px;
}

.faq .answer > :last-child {
  margin-bottom: 0;
}

.next {
  padding: 96px 0 40px;
}

/* ── 表示時のふわっと出す動き ────────── */
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-h: 64px;
  }

  .section {
    padding: 88px 0;
  }

  .header-actions .label {
    display: none;
  }

  .hero-visual {
    min-height: 380px;
  }

  .hero-meta {
    grid-template-columns: 1fr 1fr;
  }

  .hero-meta .scroll {
    display: none;
  }

  .rows a,
  .rows .row {
    grid-template-columns: 44px 1fr auto;
  }

  .footer-links {
    gap: 10px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button,
  .arrow-link::after,
  .rows a::after,
  .menu-button span {
    transition: none;
  }
}