@font-face {
  font-family: "Noto Sans JP";
  font-style: normal;
  font-weight: 400 900;
  font-display: swap;
  src: url("assets/fonts/noto-sans-jp.woff2") format("woff2");
}

:root {
  color-scheme: light;
  --paper: #f6f3e9;
  --ink: #172337;
  --muted: #4d5762;
  --blue: #00458e;
  --bright: #0757ad;
  --pale: #e9eff4;
  --yellow: #f3dc53;
  --line: #aeb3b6;
  --max: 1192px;
  --gutter: clamp(20px, 5vw, 78px);
  --sans: "Noto Sans JP", sans-serif;
  --mono: "Noto Sans JP", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 500 16px/1.8 var(--sans); }
img { display: block; max-width: 100%; height: auto; }
p, h1, h2, h3, figure { margin: 0; }
a { color: inherit; text-underline-offset: .24em; }
a:focus-visible, summary:focus-visible { outline: 3px solid #a44800; outline-offset: 5px; }
[hidden] { display: none !important; }
section[id] { scroll-margin-top: 90px; }
.wrap { width: min(var(--max), calc(100% - 2 * var(--gutter))); margin-inline: auto; }
.mono { font-family: var(--mono); }
.skip { position: fixed; top: 8px; left: 8px; z-index: 3; padding: 8px 16px; background: white; transform: translateY(-160%); }
.skip:focus { transform: none; }
.small-only { display: none; }

.masthead { position: sticky; top: 0; z-index: 50; background: var(--paper); border-top: 5px solid var(--blue); border-bottom: 1px solid var(--line); }
.mast-inner { position: relative; min-height: 64px; display: flex; align-items: center; justify-content: flex-end; gap: 20px; }
.brand { display: inline-flex; align-items: baseline; gap: 13px; text-decoration: none; white-space: nowrap; }
.brand strong { font-size: 1.28rem; letter-spacing: .04em; font-weight: 900; }
.brand span { border-left: 1px solid var(--line); padding-left: 12px; color: var(--muted); font-size: .74rem; font-weight: 700; }
nav { display: flex; align-items: center; gap: clamp(12px, 2.7vw, 36px); font-size: .82rem; font-weight: 700; }
nav a { text-decoration: none; white-space: nowrap; }
nav a:hover { text-decoration: underline; }
.nav-cta { color: var(--blue); }
.nav-cta span { padding-left: .35em; }

.hero { padding-block: clamp(29px, 5vw, 69px); }
.hero-grid { display: grid; grid-template-columns: 1.16fr 1fr; align-items: center; }
.hero-copy { padding-right: clamp(18px, 4.5vw, 66px); }
.hero-kicker {
  display: flex; align-items: center; gap: 12px; color: var(--blue);
  font-size: .76rem; font-weight: 750; letter-spacing: .09em;
}
.hero-kicker span { width: 20px; height: 1px; background: currentColor; }
.hero-title {
  margin-block: clamp(20px, 2.6vw, 34px) clamp(17px, 2.5vw, 31px);
  font-family: var(--sans);
  font-weight: 700;
}
.hero-title > span { display: block; }
.hero-subtitle {
  margin-bottom: .55em; color: var(--ink);
  font: 750 clamp(17px, 2vw, 26px)/1.4 var(--sans); letter-spacing: .01em;
}
.hero-title-lead {
  white-space: nowrap; font-size: clamp(42px, 6vw, 85px); line-height: 1.09; letter-spacing: -.065em;
}
.hero-digit {
  color: var(--blue); font: 700 1.29em/.75 Georgia, "Times New Roman", serif;
  margin-inline: .04em .08em;
}
.hero-title-main {
  margin-top: .025em; font-size: clamp(61px, 8.15vw, 114px); line-height: 1.04; letter-spacing: -.045em;
}
.hero-hook {
  width: fit-content; padding-top: 12px; border-top: 1px solid var(--line);
  font-size: clamp(.9rem, 1.4vw, 1.05rem); font-weight: 700;
}
.hero-meta {
  display: flex; align-items: center; gap: 5px 13px; flex-wrap: wrap;
  margin-top: 12px; font-size: .81rem; font-weight: 700;
}
.hero-byline { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.hero-byline small { font-size: .67rem; }
.hero-portrait {
  display: block; flex: 0 0 32px; width: 32px; height: 32px; overflow: hidden;
  margin-right: 2px; background: #dae4eb;
}
.hero-meta time { border-left: 1px solid var(--line); padding-left: 12px; white-space: nowrap; }
.button { display: inline-flex; justify-content: space-between; align-items: center; gap: 15px; min-height: 52px; padding: 10px 16px; border: 1px solid var(--blue); text-decoration: none; font-size: .86rem; font-weight: 800; line-height: 1.4; }
.button span { flex: 0 0 auto; font-size: 1.15em; }
.button-blue { color: #fff; background: var(--blue); }
.button-blue:hover { background: #062b55; border-color: #062b55; }
.button-outline { color: var(--blue); background: transparent; }
.button-outline:hover { background: var(--pale); }
.hero-button { margin-top: 21px; min-width: min(254px, 100%); }

.hero-art {
  min-height: clamp(390px, 42.5vw, 574px);
  position: relative; isolation: isolate; overflow: hidden;
  display: grid; place-items: center; background: var(--bright); color: #fff;
}
.hero-art::before {
  content: ""; position: absolute; inset: 38px 20px; z-index: -1;
  border-block: 1px solid #fff5;
  background: repeating-linear-gradient(0deg, transparent 0 45px, #fff2 45px 46px);
}
.art-top, .art-bottom {
  position: absolute; inset-inline: 20px; display: flex; justify-content: space-between;
  font-size: .62rem; font-weight: 600; letter-spacing: .15em; line-height: 1;
}
.art-top { top: 16px; }
.art-bottom { bottom: 16px; }
.art-bottom b { display: inline-block; width: 8px; height: 8px; margin-right: 4px; background: var(--yellow); }
.art-number {
  position: absolute; z-index: -1; right: -5%; bottom: -13%;
  color: #ffffff1f; font: 900 clamp(300px, 47vw, 680px)/1 var(--sans); letter-spacing: -.12em;
}
.hero-book {
  position: relative; width: clamp(185px, 24.6vw, 343px); transform: rotate(-6deg);
  box-shadow: 17px 20px 0 -5px #023563b3, 23px 30px 42px #03275185;
}
.hero-book img { width: 100%; }
.hero-book::after { content: ""; position: absolute; inset: 0 0 0 auto; width: 3px; background: #cce8fa95; }

.period { background: var(--yellow); }
.period-inner { display: flex; align-items: center; justify-content: space-between; gap: 15px 32px; padding-block: 17px; }
.period-label { display: block; font-size: clamp(20px, 2.3vw, 30px); font-weight: 900; letter-spacing: .025em; line-height: 1.4; }
.period-caption { display: block; margin-top: 4px; font-size: .82rem; font-weight: 750; }
.period-year-small { display: none; }
.period p { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 7px; font-size: .81rem; font-weight: 750; }
.period p time { white-space: nowrap; }
.period b { font: 800 clamp(27px, 3.65vw, 46px)/1.15 var(--sans); letter-spacing: -.045em; }
.period small { font-size: .84rem; }
.period-time { white-space: nowrap; }
.period-time > span { font-weight: 600; }

.section { padding-block: clamp(58px, 8vw, 107px); }
.section-label { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; color: var(--blue); font-size: .73rem; font-weight: 750; letter-spacing: .12em; }
.section-label span { display: inline-block; border-right: 1px solid currentColor; padding-right: 12px; }
h2 { font-size: clamp(30px, 4.55vw, 66px); font-weight: 900; line-height: 1.24; letter-spacing: -.075em; }
h3 { font-size: clamp(23px, 3.1vw, 40px); font-weight: 850; line-height: 1.32; letter-spacing: -.04em; }
.fine { color: var(--muted); font-size: .82rem; line-height: 1.65; }
.book-grid { display: grid; grid-template-columns: .9fr 1fr; gap: clamp(27px, 7vw, 108px); }
.book-body { align-self: end; }
.book-body > p + p { margin-top: 14px; }
.book-extra { padding: 12px 0; border-block: 1px solid var(--line); font-size: .89rem; }
.book-extra strong { display: inline-block; color: var(--blue); margin-right: 7px; }
.book-facts { display: flex; flex-wrap: wrap; gap: 4px 20px; margin: 12px 0 9px; font-size: .83rem; }
.book-facts div { display: flex; gap: 6px; }
.book-facts dt { color: var(--muted); }
.book-facts dd { margin: 0; font-weight: 750; }

.benefits { background: var(--pale); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 15px 26px; margin-bottom: 33px; }
.section-heading > p { margin-bottom: 4px; color: var(--muted); font-size: .91rem; line-height: 1.55; }
.numeral { color: var(--blue); font: 900 1.34em/.75 var(--sans); padding-inline: .045em; }
.benefit-pair { display: grid; grid-template-columns: 1fr 1fr; border-block: 1px solid #7b91a7; }
.benefit-text { padding: 28px clamp(20px, 4.25vw, 56px) 31px 0; }
.benefit-text + .benefit-text { padding-right: 0; padding-left: clamp(20px, 4.25vw, 56px); border-left: 1px solid #7b91a7; }
.benefit-meta { display: flex; gap: 11px; align-items: center; margin-bottom: 13px; color: var(--blue); font-size: .79rem; font-weight: 800; }
.benefit-meta span:first-child { font-size: 1.35rem; line-height: 1; letter-spacing: -.065em; }
.benefit-meta span + span { border-left: 1px solid currentColor; padding-left: 11px; }
.benefit-text h3 + p, .gift h3 + p, .tour-copy h3 + p { margin-top: 12px; }
.benefit-text > p, .gift > p { font-size: .92rem; }

.gift { padding-block: 37px 39px; border-bottom: 1px solid #7b91a7; }
.gift-grid { margin-top: 22px; display: grid; grid-template-columns: minmax(180px, .87fr) minmax(0, 3fr); gap: 2px; }
.gift-option { background: #f9f7ef; padding: 19px clamp(13px, 2.4vw, 27px) 23px; }
.gift-label { margin-bottom: 15px; font-size: .83rem; font-weight: 850; }
.gift-label b { background: var(--yellow); padding: 3px 8px; margin-right: 4px; font: 850 .95rem/1.4 var(--sans); }
.charm img { margin: 0 auto; height: 139px; width: auto; mix-blend-mode: multiply; }
.charm-name { margin-top: 9px; text-align: center; font-size: .75rem; font-weight: 700; }
.shelf { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); align-items: start; gap: 15px 12px; list-style: none; padding: 0; margin: 0; }
.shelf li { display: grid; justify-items: center; gap: 8px; text-align: center; font-size: .7rem; font-weight: 700; line-height: 1.4; }
.shelf img { height: clamp(65px, 10vw, 146px); width: auto; object-fit: contain; }
.tour { display: grid; grid-template-columns: 1.02fr 1fr; align-items: center; gap: clamp(21px, 4.4vw, 62px); padding-top: 38px; }
.tour-photo { width: 100%; aspect-ratio: 1.63; object-fit: cover; object-position: center 56%; }
.tour-date { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0 12px; color: var(--blue); font-weight: 800; }
.tour-date b { font: 850 2.2rem/1.13 var(--sans); letter-spacing: -.05em; }
.tour-date span { color: var(--ink); font-size: .87rem; }
.tour-copy p { margin-top: 8px; }

.reserve { background: #f9f4dc; }
.reserve .section-heading h2 { font-size: clamp(30px, 3.85vw, 54px); }
.reserve .section-heading strong { color: var(--blue); }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); list-style: none; padding: 0; margin: 0; border-block: 1px solid #928a70; }
.steps li { display: flex; flex-direction: column; align-items: flex-start; padding: 24px clamp(14px, 2.8vw, 32px) 27px 0; }
.steps li + li { padding-left: clamp(14px, 2.8vw, 32px); border-left: 1px solid #928a70; }
.steps li:last-child { padding-right: 0; }
.step-count { color: var(--blue); font-size: .86rem; font-weight: 800; }
.steps h3 { margin-top: 6px; font-size: clamp(18px, 2.1vw, 26px); }
.steps p { font-size: .88rem; margin: 10px 0 16px; }
.steps .button { margin-top: auto; }
.steps .form-status { margin: auto 0 0; min-height: 52px; display: flex; align-items: center; border-left: 3px solid var(--blue); padding: 6px 0 6px 12px; color: var(--blue); font-weight: 750; }
.rules { margin-top: 22px; font-size: .88rem; }
.rules summary { width: fit-content; cursor: pointer; font-weight: 850; }
.rules ul { padding-left: 1.35em; margin: 9px 0 0; }
.rules li + li { margin-top: 3px; }

.author { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.35fr); align-items: center; gap: clamp(25px, 6vw, 82px); }
.author-photo { min-height: 240px; display: grid; align-items: end; justify-items: center; background: #dae4eb; overflow: hidden; }
.author-photo img { width: min(78%, 325px); margin-top: 18px; }
.author-role { color: var(--blue); margin: 7px 0 11px; font-size: .91rem; font-weight: 800; }
.author-copy > p:last-child { max-width: 45ch; }

.footer { color: #fff; background: #142d4b; font-size: .87rem; }
.footer-inner { display: flex; justify-content: space-between; align-items: end; flex-wrap: wrap; gap: 16px 30px; padding-block: 27px; }
.footer-inner p { font-weight: 800; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.footer a:hover { color: var(--yellow); }
.footer a:focus-visible { outline-color: var(--yellow); }

.policy { max-width: 770px; padding-block: 48px 75px; }
.policy h1 { font-size: clamp(28px, 5.2vw, 52px); letter-spacing: -.05em; line-height: 1.3; margin-top: 16px; }
.policy h2 { font-size: clamp(18px, 3vw, 24px); margin: 28px 0 7px; letter-spacing: 0; }
.policy p { margin-top: 9px; }
.policy-back, .policy a { color: var(--blue); }
.policy ul { padding-left: 1.5em; }
.policy-contact { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin-block: 10px; }
.policy-contact dt { font-weight: 800; }
.policy-contact dd { margin: 0; overflow-wrap: anywhere; }

@media (max-width: 800px) {
  .hero-art { min-height: 365px; }
  .hero-book { width: clamp(170px, 27vw, 240px); }
  .brand { gap: 8px; }
  .brand span { padding-left: 8px; }
  .period-inner { flex-wrap: wrap; gap: 9px 17px; }
  .section-heading { align-items: start; flex-direction: column; }
  .wide-only { display: none; }
  .gift-grid { grid-template-columns: minmax(145px, .88fr) minmax(0, 3fr); }
}

@media (max-width: 600px) {
  body { font-size: 15px; }
  .mast-inner { min-height: 56px; gap: 7px; }
  .brand { flex-direction: column; align-items: flex-start; gap: 0; line-height: 1.3; }
  .brand strong { font-size: 1rem; }
  .brand span { padding: 0; border: 0; font-size: .6rem; }
  nav { font-size: .69rem; }
  .hero { padding-block: 22px 30px; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-copy { padding-right: 0; }
  .hero-kicker { font-size: .71rem; }
  .hero-title { margin-block: 15px 14px; }
  .hero-title-lead { font-size: clamp(40px, 11.5vw, 59px); }
  .hero-title-main { font-size: clamp(59px, 16vw, 81px); }
  .hero-hook { padding-top: 8px; }
  .hero-meta { margin-top: 8px; font-size: .73rem; }
  .hero-button { margin-top: 12px; min-height: 45px; }
  .hero-art { min-height: clamp(277px, 77vw, 420px); }
  .hero-book { width: clamp(145px, 43vw, 230px); }
  .hero-art::before { inset: 31px 13px; }
  .art-top, .art-bottom { inset-inline: 13px; font-size: .53rem; }
  .art-top { top: 13px; }
  .art-bottom { bottom: 13px; }
  .period-inner { padding-block: 13px; }
  .period-caption { font-size: .74rem; }
  .period p { font-size: .68rem; gap: 0 4px; }
  .period small { font-size: .7rem; }
  .period-time > span { display: none; }
  .section-label { margin-bottom: 11px; }
  .book-grid, .benefit-pair, .gift-grid, .tour, .author, .steps { grid-template-columns: 1fr; }
  .book-grid, .author { gap: 18px; }
  .section-heading { gap: 10px; margin-bottom: 20px; }
  .section-heading > p { margin: 0; }
  .small-only { display: initial; }
  .benefit-text, .benefit-text + .benefit-text { padding: 20px 0 23px; border-left: 0; }
  .benefit-text + .benefit-text { border-top: 1px solid #7b91a7; }
  .gift, .tour { padding-top: 25px; }
  .gift { padding-bottom: 25px; }
  .gift-grid { gap: 5px; }
  .charm img { height: 138px; }
  .shelf { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .shelf img { height: clamp(75px, 23vw, 120px); }
  .tour { gap: 15px; }
  .steps li, .steps li + li { padding: 17px 0; border-left: 0; }
  .steps li + li { border-top: 1px solid #928a70; }
  .steps p { margin-bottom: 11px; }
  .steps li:last-child p { margin-bottom: 0; }
  .steps .form-status { min-height: 37px; }
  .author-photo { min-height: auto; }
  .author-photo img { width: min(63%, 235px); }
}

@media (max-width: 360px) {
  .hero-meta { gap: 5px 8px; }
  .hero-meta time { padding-left: 7px; }
  .period-year { display: none; }
  .period-year-small { display: inline; margin-right: 6px; }
  .period p { gap: 0 3px; }
  .period b { font-size: 25px; }
  .period small { font-size: .65rem; }
  .period-time { font-size: .62rem; }
}

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

.steps .form-status.form-note { margin: 0 0 12px; min-height: 0; font-size: .75rem; }

/* キャンペーンのメインビジュアル */
.hero-visual { position: relative; padding: 0; overflow: hidden; background: #06234d; color: #fff; }
.hero-visual-image { display: block; width: 100%; height: auto; }
.hero-visual-inner { position: absolute; inset: 0; display: flex; align-items: center; }
.hero-visual-copy { width: 45%; max-width: 560px; padding-block: 18px; }
.visual-kicker { margin-bottom: clamp(12px, 1.6vw, 23px); color: #e4effb; font-size: clamp(11px, 1.1vw, 16px); font-weight: 700; letter-spacing: .08em; }
.visual-headline { font-family: var(--sans); font-size: clamp(36px, 4.4vw, 68px); font-weight: 800; letter-spacing: -.055em; line-height: 1.34; }
.visual-headline span { display: block; white-space: nowrap; }
.visual-book-title { margin-top: clamp(17px, 2.2vw, 33px); font-size: clamp(12px, 1.1vw, 17px); font-weight: 700; line-height: 1.7; }
.visual-book-title strong { font-size: clamp(20px, 2vw, 30px); letter-spacing: -.025em; }
.visual-book-title strong span { color: var(--yellow); }
.visual-byline { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-top: 10px; font-size: clamp(12px, 1.1vw, 16px); font-weight: 700; }
.visual-byline small { font-size: .72em; }
.visual-byline time { margin-left: 9px; padding-left: 12px; border-left: 1px solid #ffffff70; font-size: .85em; }
.button-yellow { border-color: var(--yellow); background: var(--yellow); color: var(--ink); }
.button-yellow:hover { background: #ffe97a; border-color: #ffe97a; }
.visual-button { margin-top: clamp(18px, 2.4vw, 34px); min-width: min(280px, 100%); }
.hero-visual a:focus-visible { outline-color: #fff; }
@media (max-width: 900px) {
  .hero-visual-image { height: clamp(260px, 72vw, 580px); object-fit: cover; object-position: right center; }
  .hero-visual-inner { position: static; display: block; }
  .hero-visual-copy { width: 100%; max-width: none; padding-block: 25px 33px; }
  .visual-kicker { font-size: .8rem; margin-bottom: 12px; }
  .visual-headline { font-size: clamp(35px, 8.2vw, 55px); }
  .visual-book-title { font-size: .82rem; margin-top: 18px; }
  .visual-book-title strong { font-size: clamp(21px, 5.5vw, 30px); }
  .visual-byline { font-size: .85rem; }
  .visual-button { width: 100%; max-width: 360px; margin-top: 21px; }
}

/* 上部固定ナビゲーション */
.menu-toggle { display: none; align-items: center; gap: 9px; min-height: 44px; border: 0; padding: 8px 0 8px 12px; background: transparent; color: var(--blue); font: 800 .84rem/1.4 var(--sans); cursor: pointer; }
.menu-toggle:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.menu-icon { display: grid; gap: 4px; width: 22px; }
.menu-icon span { height: 2px; width: 22px; background: currentColor; }
@media (max-width: 700px) {
  .menu-toggle { display: inline-flex; }
  .mast-inner { min-height: 56px; }
  .masthead[data-menu-ready="true"] nav { display: none; position: absolute; top: 100%; right: 0; width: min(280px, calc(100vw - 40px)); padding: 7px 17px; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 9px 20px #17233720; flex-direction: column; align-items: stretch; gap: 0; font-size: .9rem; }
  .masthead[data-menu-ready="true"] .menu-toggle[aria-expanded="true"] + nav { display: flex; }
  .masthead[data-menu-ready="true"] nav a { display: block; padding: 13px 5px; }
  .masthead[data-menu-ready="true"] nav a + a { border-top: 1px solid #17233720; }
  section[id] { scroll-margin-top: 80px; }
}