* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  background: #f7f6f2;
  color: #171717;
  font-family: -apple-system, BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic",
    sans-serif;
  line-height: 1.9;
}

.container {
  width: min(720px, 88%);
  margin: 0 auto;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 0;
}

.logo,
h2,
blockquote,
.mission-statement,
.principles strong,
.journal-title,
.closing-japanese {
  font-family: "Hiragino Mincho ProN", "Yu Mincho",
    "YuMincho", serif;
  font-weight: 400;
}

.logo {
  font-size: clamp(52px, 15vw, 100px);
  letter-spacing: 0.18em;
  margin-left: 0.18em;
}

.roman {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.45em;
  margin-left: 0.45em;
}

.intro {
  margin-top: 70px;
  font-family: "Hiragino Mincho ProN", "Yu Mincho",
    "YuMincho", serif;
  font-size: 16px;
  letter-spacing: 0.08em;
}

.scroll-link {
  display: inline-block;
  margin-top: 90px;
  color: inherit;
  text-decoration: none;
  font-size: 10px;
  letter-spacing: 0.3em;
  opacity: 0.6;
}

section {
  padding: 110px 0;
  border-top: 1px solid #d8d6d0;
}

.section-number {
  font-size: 11px;
  letter-spacing: 0.25em;
  opacity: 0.55;
  margin-bottom: 20px;
}

h2 {
  font-size: 28px;
  letter-spacing: 0.08em;
  margin: 0 0 35px;
}

p {
  margin: 0 0 25px;
}

.english {
  color: #55534e;
  font-size: 14px;
  line-height: 2;
}

blockquote {
  margin: 60px 0;
  padding-left: 25px;
  border-left: 1px solid #99958c;
  font-size: 20px;
}

.mission-statement {
  font-size: 21px;
  line-height: 2.1;
}

.principles {
  list-style: none;
  padding: 0;
  margin: 50px 0 0;
}

.principles li {
  padding: 22px 0;
  border-bottom: 1px solid #d8d6d0;
}

.principles strong {
  display: block;
  font-size: 18px;
  margin-bottom: 5px;
}

.principles span {
  display: block;
}

.journal-box {
  margin-top: 50px;
  padding: 40px 30px;
  border: 1px solid #bbb9b2;
  text-align: center;
}

.journal-title {
  font-size: 25px;
  letter-spacing: 0.12em;
  margin-bottom: 20px;
}

.culture-words {
  margin: 35px 0;
  line-height: 2.2;
  font-family: "Hiragino Mincho ProN", "Yu Mincho",
    "YuMincho", serif;
  letter-spacing: 0.08em;
}

.closing {
  text-align: center;
  padding: 160px 0;
}

.closing-japanese {
  font-size: 22px;
  line-height: 2.2;
  margin-bottom: 30px;
}

.closing-english {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: #55534e;
}

.back-to-top {
  display: inline-block;
  margin-top: 75px;
  color: inherit;
  text-decoration: none;
  font-size: 11px;
  letter-spacing: 0.2em;
}

footer {
  padding: 40px 0 60px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.25em;
  opacity: 0.5;
}

a:focus-visible {
  outline: 2px solid #55534e;
  outline-offset: 5px;
}

@media (max-width: 600px) {
  section {
    padding: 80px 0;
  }

  .intro {
    margin-top: 50px;
  }

  .scroll-link {
    margin-top: 70px;
  }

  blockquote {
    font-size: 18px;
  }

  .mission-statement {
    font-size: 19px;
  }

  .closing {
    padding: 120px 0;
  }
}


.manual-link {
  max-width: 900px;
  margin: 80px auto;
  padding: 56px 24px;
  text-align: center;

  /* HPの背景と自然になじませる */
  background: transparent;
  border-top: 1px solid rgba(80, 76, 65, 0.22);
  border-bottom: 1px solid rgba(80, 76, 65, 0.22);

  color: inherit;
  box-sizing: border-box;
}

/* セクションラベル */
.manual-link .section-label {
  margin: 0 0 24px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  line-height: 1.8;
  opacity: 0.65;
}

/* 見出し */
.manual-link h2 {
  margin: 0 0 22px;
  font-family: inherit;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.08em;
}

/* 日本語の説明 */
.manual-link > p:not(.section-label):not(.english) {
  margin: 0 0 28px;
  font-size: 0.9rem;
  line-height: 2.1;
  letter-spacing: 0.04em;
  opacity: 0.78;
}

/* マニュアルリンク */
.manual-link a {
  display: inline-block;
  margin: 4px 12px;
  padding: 8px 0;

  color: inherit;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  line-height: 1.8;
  text-decoration: none;

  border-bottom: 1px solid currentColor;
  transition:
    opacity 0.25s ease,
    border-color 0.25s ease;
}

.manual-link a:hover {
  opacity: 0.55;
  border-bottom-color: transparent;
}

/* 英語の説明 */
.manual-link .english {
  margin: 24px 0 10px;
  font-family: sans-serif;
  font-size: 0.78rem;
  line-height: 1.9;
  letter-spacing: 0.025em;
  opacity: 0.6;
}

/* スマートフォン */
@media (max-width: 600px) {
  .manual-link {
    margin: 56px 20px;
    padding: 40px 8px;
  }

  .manual-link .section-label {
    margin-bottom: 18px;
  }

  .manual-link h2 {
    font-size: 1.45rem;
    letter-spacing: 0.05em;
  }

  .manual-link > p:not(.section-label):not(.english) {
    font-size: 0.82rem;
  }

  .manual-link a {
    margin: 4px 8px;
    font-size: 0.8rem;
  }

  .manual-link .english {
    font-size: 0.73rem;
  }
}