:root {
  --ink: #333333;
  --cream: #ffffff;
  --paper: #ffffff;
  --berry: #28008a;
  --green: #245784;
  --line: rgba(40, 0, 138, .16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--cream); color: var(--ink); font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 2; }
a { color: inherit; text-decoration: none; }

.site-header { height: 86px; display: flex; align-items: center; justify-content: space-between; padding: 0 5vw; border-bottom: 1px solid rgba(255,255,255,.24); background: #28008a; position: relative; z-index: 3; color: #fff; }
.brand { display: flex; align-items: center; gap: 13px; }
.brand > img { width: 208px; height: auto; }
.brand-divider { width: 1px; height: 30px; background: rgba(255,255,255,.45); }
.brand strong { display: block; font: 500 20px/1.05 "Yu Mincho", "Hiragino Mincho ProN", serif; letter-spacing: .12em; }
.brand small { display: block; margin-top: 5px; font-size: 9px; letter-spacing: .18em; color: rgba(255,255,255,.72); }
.header-cta { font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; font-size: 14px; letter-spacing: .1em; border-bottom: 1px solid #fff; padding: 8px 0; }
.header-cta span { color: #fff; margin-left: 8px; }

.hero { min-height: calc(100vh - 86px); position: relative; display: grid; grid-template-columns: minmax(0,1.25fr) minmax(340px,.75fr); gap: 6vw; align-items: center; padding: 7vh 9vw 8vh; overflow: hidden; color: #fff; background: linear-gradient(90deg, rgba(40,0,138,.92) 0%, rgba(40,0,138,.72) 58%, rgba(40,0,138,.42) 100%), url('../images/jishu-kai.png') center/cover no-repeat; }
.hero::before { content: "Jishu-kai"; position: absolute; left: 3vw; bottom: -2vw; font: 400 clamp(76px,13vw,200px)/.8 Georgia, serif; color: rgba(255,255,255,.08); white-space: nowrap; }
.hero-copy { position: relative; z-index: 1; max-width: 760px; }
.eyebrow { margin: 0 0 26px; color: #fff; font: 400 17px/1 Georgia, serif; letter-spacing: .18em; }
h1 { margin: 0; font: 500 clamp(42px,5.3vw,78px)/1.36 "Yu Mincho", "Hiragino Mincho ProN", serif; letter-spacing: .02em; }
h1 em { color: #fff; font-style: normal; background: linear-gradient(transparent 82%,rgba(255,255,255,.3) 82%); }
.lead { max-width: 590px; margin: 28px 0 0; font-size: clamp(15px,1.3vw,18px); line-height: 2; color: rgba(255,255,255,.9); }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 34px; }
.primary-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 32px; min-width: 260px; padding: 18px 23px; border: 1px solid #fff; border-radius: 0; background: #fff; color: var(--berry); font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; letter-spacing: .08em; box-shadow: none; transition: color .2s, background .2s; }
.primary-button:hover { background: transparent; color: #fff; }
.text-link { font-size: 13px; font-weight: 700; border-bottom: 1px solid #fff; padding-bottom: 4px; }

.event-card { position: relative; z-index: 1; color: #333; background: rgba(255,255,255,.96); border: 0; box-shadow: 18px 18px 0 rgba(255,255,255,.18); padding: 26px; transform: none; }
.event-topline { display: flex; justify-content: space-between; border-bottom: 1px solid var(--ink); padding-bottom: 12px; font: 700 10px/1 Arial,sans-serif; letter-spacing: .15em; }
.event-topline span:last-child { color: var(--green); font-family: inherit; }
.date-block { display: flex; align-items: flex-end; gap: 13px; margin: 20px 0 16px; }
.date-block strong { font: 800 clamp(48px,5vw,74px)/.8 Arial,sans-serif; letter-spacing: -.06em; }
.date-block span { color: var(--green); font: 700 12px/1.25 Arial,sans-serif; }
.book-visual { min-height: 220px; background: var(--green); color: #fff; display: flex; flex-direction: column; justify-content: space-between; padding: 20px 22px; position: relative; overflow: hidden; }
.book-visual::after { content: ""; width: 160px; height: 160px; border: 1px solid rgba(255,255,255,.35); border-radius: 50%; position: absolute; right: -50px; top: 28px; box-shadow: 0 0 0 24px rgba(255,255,255,.04),0 0 0 50px rgba(255,255,255,.03); }
.book-visual span { font-size: 10px; letter-spacing: .2em; color: #d9e6dc; }
.book-visual strong { position: relative; z-index: 1; font: 800 clamp(28px,3.1vw,45px)/.82 Arial,sans-serif; letter-spacing: -.05em; }
.book-visual small { position: relative; z-index: 1; font-weight: 700; letter-spacing: .1em; }
.event-facts { margin: 18px 0 0; }
.event-facts div { display: grid; grid-template-columns: 58px 1fr; padding: 10px 0; border-top: 1px solid var(--line); }
.event-facts dt { color: var(--green); font: 700 9px/1.7 Arial,sans-serif; letter-spacing: .12em; }
.event-facts dd { margin: 0; font-size: 12px; font-weight: 700; }
.vertical-note { position: absolute; right: 2vw; top: 50%; margin: 0; transform: rotate(90deg) translateX(50%); transform-origin: right center; color: rgba(255,255,255,.72); font: 500 10px/1 Georgia,serif; letter-spacing: .28em; }

.section-kicker { margin: 0 0 24px; color: var(--berry); font: 400 19px/1 Georgia, serif; letter-spacing: .16em; }
h2 { margin: 0; font: 400 clamp(38px,5vw,68px)/1.45 "Yu Mincho", "Hiragino Mincho ProN", serif; letter-spacing: .02em; }

.promise { padding: 140px 9vw 130px; background: #fff; }
.promise-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8vw; align-items: end; }
.promise-grid > div { max-width: 610px; color: #536058; font-size: 15px; line-height: 2; }
.promise-grid .promise-lead { color: var(--ink); font: 400 clamp(18px,1.7vw,25px)/2 "Yu Mincho", "Hiragino Mincho ProN", serif; margin-top: 0; }
.benefit-grid { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 95px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.benefit-grid article { padding: 28px 34px 40px 0; min-height: 245px; border-right: 1px solid var(--line); }
.benefit-grid article + article { padding-left: 34px; }
.benefit-grid article:last-child { border-right: 0; }
.benefit-grid span { color: var(--berry); font: 700 11px/1 Arial,sans-serif; }
.benefit-grid h3 { margin: 38px 0 16px; font: 500 24px/1.4 "Yu Mincho", "Hiragino Mincho ProN", serif; }
.benefit-grid p { margin: 0; color: #5c675f; font-size: 13px; line-height: 1.9; }

.flow-section { background: #28008a; color: white; padding: 125px 9vw; }
.flow-section .section-kicker { color: #fff; }
.section-heading { display: grid; grid-template-columns: 1fr .8fr; gap: 10vw; align-items: end; }
.section-heading > p { max-width: 520px; margin: 0; color: #d7e2db; line-height: 2; }
.flow-list { list-style: none; padding: 0; margin: 85px 0 0; display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid rgba(255,255,255,.6); }
.flow-list li { display: grid; grid-template-columns: 46px 1fr; gap: 20px; padding: 32px 30px 0 0; border-right: 1px solid rgba(255,255,255,.18); min-height: 210px; }
.flow-list li + li { padding-left: 30px; }
.flow-list li:last-child { border-right: 0; }
.flow-list > li > span { color: #beb2db; font: 400 40px/1 Georgia,serif; }
.flow-list small { font: 700 9px/1 Arial,sans-serif; letter-spacing: .18em; color: #9bb3a6; }
.flow-list h3 { margin: 12px 0 18px; font: 400 24px/1.4 "Yu Mincho", "Hiragino Mincho ProN", serif; }
.flow-list p { margin: 0; color: #c9d7cf; font-size: 13px; line-height: 1.8; }

.session-section { display: grid; grid-template-columns: .85fr 1.15fr; gap: 9vw; padding: 140px 9vw; background: #f6f6f6; }
.session-title { position: sticky; top: 50px; align-self: start; }
.session-title > p:last-child { margin-top: 34px; max-width: 520px; color: #536058; line-height: 2; }
.session-panel { border-top: 2px solid var(--ink); }
.session-row { display: grid; grid-template-columns: 90px 1fr; gap: 30px; align-items: center; padding: 24px 4px; border-bottom: 1px solid var(--line); }
.session-row > span { color: var(--green); font: 600 10px/1 Georgia,Arial,sans-serif; letter-spacing: .16em; }
.session-row strong { font-size: clamp(16px,1.5vw,21px); }
.session-row strong small { display: block; margin-top: 7px; color: #667169; font-size: 11px; font-weight: 500; }
.session-row.date strong { font: 800 clamp(32px,4vw,57px)/1 Arial,sans-serif; letter-spacing: -.05em; }
.session-row.date small { display: inline; margin-left: 8px; color: var(--berry); font-size: 12px; }
.wide-button { margin-top: 32px; display: flex; justify-content: space-between; align-items: center; padding: 22px 25px; background: var(--berry); color: white; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; letter-spacing: .12em; transition: background .2s; }
.wide-button:hover { background: #4b2bbd; }
.wide-button b { font-size: 22px; }
.fax-note { margin: 14px 0 0; text-align: center; color: #68736b; font-size: 11px; }

.audience-section { display: grid; grid-template-columns: .75fr 1.25fr; gap: 10vw; padding: 125px 9vw; background: #fff; }
.audience-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--ink); }
.audience-list li { display: flex; gap: 18px; align-items: center; padding: 23px 8px; border-bottom: 1px solid var(--line); font-weight: 600; }
.audience-list span { color: var(--green); font-size: 8px; }

.faq-section { display: grid; grid-template-columns: .65fr 1.35fr; gap: 10vw; padding: 125px 9vw; background: #f6f6f6; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 20px; padding: 25px 4px; font-weight: 700; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--green); font-size: 22px; font-weight: 400; transition: transform .2s; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { margin: -4px 0 0; padding: 0 45px 25px 4px; color: #59655d; font-size: 14px; line-height: 1.9; }

.final-cta { padding: 130px 22px; text-align: center; background: #28008a; color: white; position: relative; overflow: hidden; }
.final-cta::before { content: "時"; position: absolute; font: 700 400px/1 serif; color: rgba(255,255,255,.055); left: 50%; top: 50%; transform: translate(-50%,-50%); }
.final-cta .section-kicker { color: #fff; position: relative; }
.final-cta h2 { position: relative; }
.final-cta > p:not(.section-kicker) { position: relative; margin: 22px 0 32px; }
.final-button { position: relative; display: inline-flex; gap: 45px; align-items: center; background: white; color: var(--ink); padding: 20px 25px; min-width: 310px; justify-content: space-between; font-weight: 700; }
.final-button span { color: var(--berry); }

footer { background: #28008a; color: white; display: grid; grid-template-columns: 1fr auto auto; gap: 45px; align-items: end; padding: 55px 5vw; }
.footer-brand > img { width: 208px; }
footer > div { font-size: 11px; line-height: 1.8; }
footer > div p { margin: 0; }
footer > div a { color: #b7c3ba; text-decoration: underline; }
footer > small { color: #8d9a91; font-size: 9px; letter-spacing: .08em; }
.mobile-cta { display: none; }

@media (max-width: 800px) {
  .site-header { height: 74px; padding: 0 22px; }
  .header-cta { font-size: 12px; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding: 60px 22px 80px; gap: 50px; }
  h1 { font-size: clamp(39px,11vw,58px); }
  .lead { line-height: 1.85; }
  .vertical-note { display: none; }
  .event-card { max-width: 500px; width: calc(100% - 10px); justify-self: center; box-shadow: 10px 10px 0 #eadfce; }
  .promise, .flow-section, .session-section, .audience-section, .faq-section { padding: 90px 22px; }
  .promise-grid, .section-heading, .session-section, .audience-section, .faq-section { grid-template-columns: 1fr; gap: 45px; }
  .benefit-grid { grid-template-columns: 1fr; margin-top: 60px; }
  .benefit-grid article, .benefit-grid article + article { padding: 27px 0 32px; border-right: 0; border-bottom: 1px solid var(--line); min-height: auto; }
  .benefit-grid article:last-child { border-bottom: 0; }
  .benefit-grid h3 { margin: 18px 0 12px; }
  .flow-list { grid-template-columns: 1fr; margin-top: 55px; }
  .flow-list li, .flow-list li + li { padding: 28px 0; min-height: auto; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); }
  .session-title { position: static; }
  footer { grid-template-columns: 1fr; gap: 28px; align-items: start; padding-bottom: 100px; }
  .mobile-cta { display: flex; justify-content: space-between; position: fixed; z-index: 10; bottom: 10px; left: 10px; right: 10px; padding: 17px 20px; background: var(--berry); color: white; box-shadow: 0 8px 30px rgba(40,0,138,.28); font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; letter-spacing: .08em; }
}

@media (max-width: 480px) {
  .brand > img { width: 146px; }
  .brand-divider { height: 24px; }
  .brand small { display: none; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; }
  .primary-button { width: 100%; }
  .session-row { grid-template-columns: 68px 1fr; gap: 15px; }
  .session-row.date strong { font-size: 31px; }
  .final-button { min-width: min(310px,100%); }
}