:root {
  --navy: #032b57;
  --navy-deep: #01203f;
  --blue: #174f82;
  --mist: #edf3f7;
  --paper: #f8fafc;
  --ink: #092c52;
  --line: rgba(9, 44, 82, .2);
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 96px; }
body { margin: 0; color: var(--ink); background-color: var(--paper); background-image: linear-gradient(rgba(248,250,252,.58), rgba(248,250,252,.7)), url("assets/yasuda-auditorium-watercolor.jpeg"); background-size: cover; background-position: center top; background-attachment: fixed; font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif; line-height: 1.8; }
a { color: inherit; }
img { display: block; max-width: 100%; }

.site-header { position: sticky; top: 0; z-index: 20; height: 82px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(22px, 5vw, 76px); background: rgba(248,250,252,.78); backdrop-filter: blur(18px); border-bottom: 1px solid rgba(9,44,82,.12); }
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-number { font-family: Georgia, serif; font-size: 2.8rem; line-height: 1; color: var(--navy); border-right: 1px solid var(--line); padding-right: 14px; }
.brand-copy { font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; font-size: .72rem; font-weight: 600; line-height: 1.45; letter-spacing: .04em; }
.site-nav { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 38px); font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; font-size: .88rem; font-weight: 600; }
.site-nav a { text-decoration: none; }
.site-nav a:hover { opacity: .62; }
.menu-button { display: none; color: var(--navy); background: transparent; border: 1px solid var(--line); padding: 8px 13px; font: inherit; }

.hero { position: relative; min-height: calc(100vh - 82px); overflow: hidden; background-image: linear-gradient(90deg, rgba(249,251,253,.98) 0%, rgba(249,251,253,.9) 44%, rgba(249,251,253,.25) 69%, rgba(249,251,253,.06) 100%), url("assets/yasuda-auditorium-watercolor.jpeg"); background-size: cover; background-position: center center; }
.hero-copy { position: relative; z-index: 2; display: flex; min-height: calc(100vh - 82px); max-width: 850px; flex-direction: column; justify-content: center; padding: clamp(64px, 8vw, 126px) clamp(28px, 6vw, 100px); }
.eyebrow, .section-index { margin: 0 0 26px; font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; font-size: .78rem; font-weight: 700; letter-spacing: .13em; }
.hero h1 { margin: 0; font-size: clamp(3.1rem, 6.8vw, 7.7rem); line-height: 1.16; letter-spacing: -.06em; font-weight: 500; }
.hero h1 span { white-space: nowrap; }
.hero-question { margin: 26px 0 44px; font-size: clamp(1.25rem, 2vw, 2rem); letter-spacing: .11em; }
.event-facts { display: grid; gap: 14px; width: min(600px, 100%); padding: 26px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.event-facts div { display: grid; grid-template-columns: 64px 1fr; align-items: baseline; gap: 20px; }
.event-facts span { font-family: "Yu Gothic", sans-serif; font-size: .75rem; letter-spacing: .2em; }
.event-facts strong { font-size: clamp(1.25rem, 2vw, 1.8rem); font-weight: 600; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 34px; font-family: "Yu Gothic", sans-serif; font-size: .92rem; font-weight: 700; }
.primary-button { display: inline-block; padding: 14px 24px; color: white; background: var(--navy); text-decoration: none; }
.text-link { text-underline-offset: 6px; }
.vertical-note { position: absolute; z-index: 2; right: 22px; top: 50%; margin: 0; writing-mode: vertical-rl; font-family: Georgia, serif; font-size: .66rem; letter-spacing: .22em; color: rgba(3,43,87,.56); transform: translateY(-50%); }

.section { padding: clamp(78px, 10vw, 150px) clamp(28px, 8vw, 128px); }
.overview-section, .access-section { display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(50px, 10vw, 150px); background: linear-gradient(110deg, rgba(248,250,252,.88), rgba(248,250,252,.7)); backdrop-filter: blur(1.5px); }
.section-heading h2 { margin: 0; font-size: clamp(2.6rem, 5vw, 5.6rem); line-height: 1.25; font-weight: 500; letter-spacing: -.04em; }
.overview-copy { max-width: 760px; }
.overview-copy p { font-size: 1.05rem; }
.overview-copy .lead { margin-top: 0; font-size: clamp(1.35rem, 2.1vw, 2rem); line-height: 1.9; }
.organizers { margin: 55px 0 0; border-top: 1px solid var(--line); }
.organizers div { display: grid; grid-template-columns: 120px 1fr; padding: 17px 0; border-bottom: 1px solid var(--line); }
.organizers dt { font-family: "Yu Gothic", sans-serif; font-size: .82rem; font-weight: 700; }
.organizers dd { margin: 0; }

.keynote-section { display: grid; grid-template-columns: .45fr 1.55fr; min-height: 680px; color: white; background-image: linear-gradient(100deg, rgba(1,32,63,.98), rgba(3,43,87,.9)), url("assets/yasuda-auditorium-watercolor.jpeg"); background-size: cover; background-position: center; padding-top: 0; padding-bottom: 0; }
.keynote-label { display: flex; flex-direction: column; justify-content: center; padding: 70px 0; border-right: 1px solid rgba(255,255,255,.3); }
.keynote-label span { font-family: Georgia, serif; letter-spacing: .24em; font-size: .77rem; opacity: .64; }
.keynote-label strong { margin-top: 12px; font-size: 1.55rem; font-weight: 500; }
.keynote-content { align-self: center; padding: clamp(70px, 9vw, 130px) 0 clamp(70px, 9vw, 130px) clamp(46px, 8vw, 120px); }
.status { display: inline-block; margin: 0 0 26px; padding: 4px 12px; border: 1px solid rgba(255,255,255,.5); font-family: "Yu Gothic", sans-serif; font-size: .74rem; letter-spacing: .08em; }
.keynote-content h2 { margin: 0; font-size: clamp(2.5rem, 5vw, 5rem); line-height: 1.35; font-weight: 500; }
.speaker { margin-top: 52px; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.35); }
.speaker-name { margin: 0 0 10px; font-size: clamp(1.8rem, 3vw, 3rem); }
.speaker-name small { font-size: .55em; }
.speaker > p:last-child { margin: 0; opacity: .82; }

.program-section { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(50px, 9vw, 140px); background: linear-gradient(110deg, rgba(237,243,247,.84), rgba(237,243,247,.66)); backdrop-filter: blur(1.5px); }
.section-heading.light p:last-child { max-width: 400px; font-size: .9rem; }
.program-list { border-top: 1px solid var(--line); }
.program-list article { display: grid; grid-template-columns: 76px 1fr; gap: 24px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.program-number { font-family: Georgia, serif; font-size: 1.15rem; color: var(--blue); }
.program-list p { margin: 0 0 8px; font-family: "Yu Gothic", sans-serif; font-size: .8rem; font-weight: 700; letter-spacing: .1em; }
.program-list h3 { margin: 0; font-size: clamp(1.35rem, 2vw, 2rem); line-height: 1.5; font-weight: 500; }
.program-list h3 small { font-size: .7em; }
.program-list ul { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 18px 0 0; padding: 0; list-style: none; font-size: .9rem; }
.program-list li::before { content: "○"; margin-right: 7px; color: var(--blue); }

.access-card { position: relative; overflow: hidden; min-height: 390px; padding: clamp(34px, 5vw, 70px); color: white; background-image: linear-gradient(135deg, rgba(1,32,63,.95), rgba(23,79,130,.76)), url("assets/yasuda-auditorium-watercolor.jpeg"); background-size: cover; background-position: 66% center; }
.access-card .address { margin: 0; font-size: clamp(1.25rem, 2vw, 1.7rem); }
.venue-name { position: relative; z-index: 1; margin: 0; font-size: 1rem; letter-spacing: .05em; }
.venue-name strong { display: inline-block; margin-top: 2px; font-size: clamp(1.65rem, 2.8vw, 2.5rem); font-weight: 500; }
.address { position: relative; z-index: 1; margin: 8px 0 28px; font-size: 1rem; opacity: .86; }
.station-access { position: relative; z-index: 1; max-width: 660px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.34); }
.access-label { margin: 0 0 12px; font-family: "Yu Gothic", sans-serif; font-size: .78rem; font-weight: 700; letter-spacing: .16em; opacity: .76; }
.station-access ul { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 28px; margin: 0; padding: 0; list-style: none; }
.station-access li { display: grid; grid-template-columns: 1fr auto; gap: 0 14px; padding-bottom: 9px; border-bottom: 1px solid rgba(255,255,255,.18); }
.station-access li span { grid-column: 1 / -1; font-size: .76rem; opacity: .68; }
.station-access li strong { font-size: 1rem; font-weight: 600; }
.station-access li small { align-self: end; font-size: .82rem; }
.access-note { margin: 15px 0 0; font-size: .76rem; line-height: 1.65; opacity: .7; }
.access-links { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 25px; font-family: "Yu Gothic", sans-serif; font-size: .84rem; font-weight: 700; }
.access-links a { text-underline-offset: 5px; }
.auditorium-mark { position: absolute; right: 7%; bottom: -7%; display: flex; align-items: flex-end; gap: 10px; height: 82%; opacity: .16; }
.auditorium-mark span { display: block; width: 22px; background: white; }
.auditorium-mark span:nth-child(1), .auditorium-mark span:nth-child(5) { height: 50%; }
.auditorium-mark span:nth-child(2), .auditorium-mark span:nth-child(4) { height: 72%; }
.auditorium-mark span:nth-child(3) { height: 100%; }

.access-map-section { display: grid; grid-template-columns: .62fr 1.38fr; gap: clamp(50px, 8vw, 120px); background: rgba(255,255,255,.94); }
.access-map-section > .section-heading h2 { font-size: clamp(2rem, 3.3vw, 3.6rem); letter-spacing: -.02em; white-space: nowrap; }
.access-map-content { display: grid; grid-template-columns: minmax(260px, .78fr) minmax(360px, 1.22fr); gap: clamp(28px, 4vw, 56px); align-items: stretch; }
.access-map-copy { padding: 8px 0; }
.access-map-copy .venue-name { color: var(--ink); }
.access-map-copy .address { color: var(--ink); opacity: .72; }
.route-list { margin: 28px 0 0; border-top: 1px solid var(--line); }
.route-list div { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.route-list dt { font-family: "Yu Gothic", sans-serif; font-size: .78rem; font-weight: 700; }
.route-list dd { margin: 0; font-size: .9rem; }
.access-map-copy .access-note { color: var(--ink); opacity: .62; }
.access-map-links { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; margin-top: 22px; font-family: "Yu Gothic", sans-serif; font-size: .84rem; font-weight: 700; }
.access-map-links a { text-underline-offset: 5px; }
.map-frame { min-height: 420px; border: 1px solid var(--line); background: var(--mist); }
.map-frame iframe { display: block; width: 100%; height: 100%; min-height: 420px; border: 0; }

.registration-section { padding: clamp(90px, 13vw, 180px) 28px; text-align: center; color: white; background-image: linear-gradient(rgba(1,32,63,.95), rgba(1,22,44,.97)), url("assets/yasuda-auditorium-watercolor.jpeg"); background-size: cover; background-position: center 72%; }
.registration-section h2 { margin: 0; font-size: clamp(3rem, 6vw, 6rem); font-weight: 500; }
.registration-section > p:not(.section-index) { max-width: 650px; margin: 18px auto 36px; }
.coming-soon { display: inline-block; padding: 13px 24px; border: 1px solid rgba(255,255,255,.45); font-family: Georgia, serif; font-size: .78rem; letter-spacing: .25em; }

footer { display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 30px; align-items: center; padding: 35px clamp(24px, 6vw, 90px); color: rgba(255,255,255,.76); background: #00162c; font-family: "Yu Gothic", sans-serif; font-size: .72rem; }
footer p { margin: 0; }
.copyright { text-align: right; }

@media (max-width: 900px) {
  .site-header { height: 70px; }
  .menu-button { display: block; }
  .site-nav { position: absolute; top: 70px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 14px 24px 24px; background: rgba(248,250,252,.96); border-bottom: 1px solid var(--line); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 0; }
  .hero-copy { padding-bottom: 40px; }
  .vertical-note { right: 12px; }
  .overview-section, .access-section, .access-map-section, .program-section { grid-template-columns: 1fr; }
  .access-map-content { grid-template-columns: 1fr; }
  .keynote-section { grid-template-columns: 1fr; min-height: auto; padding-top: 80px; padding-bottom: 80px; }
  .keynote-label { padding: 0 0 22px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.3); }
  .keynote-content { padding: 42px 0 0; }
  footer { grid-template-columns: 1fr; }
  .copyright { text-align: left; }
}

@media (max-width: 560px) {
  .brand-copy { display: none; }
  .brand-number { border-right: 0; padding-right: 0; }
  body { background-attachment: scroll; background-image: linear-gradient(rgba(248,250,252,.66), rgba(248,250,252,.76)), url("assets/yasuda-auditorium-watercolor.jpeg"); background-position: 66% top; }
  .hero { min-height: auto; background-image: linear-gradient(90deg, rgba(249,251,253,.98) 0%, rgba(249,251,253,.94) 56%, rgba(249,251,253,.52) 100%), url("assets/yasuda-auditorium-watercolor.jpeg"); background-position: 67% center; }
  .hero-copy { min-height: calc(100svh - 70px); }
  .hero-copy { padding-top: 70px; }
  .hero h1 { font-size: 3rem; }
  .hero h1 span { white-space: normal; }
  .hero-question { font-size: 1rem; letter-spacing: .05em; }
  .event-facts div { grid-template-columns: 50px 1fr; gap: 12px; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .overview-section, .access-section, .access-map-section { gap: 36px; }
  .organizers div { grid-template-columns: 96px 1fr; gap: 10px; }
  .program-list article { grid-template-columns: 44px 1fr; gap: 12px; }
  .program-list ul { display: block; }
  .station-access ul { grid-template-columns: 1fr; gap: 9px; }
  .map-frame, .map-frame iframe { min-height: 330px; }
}

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