:root {
  --ink: #11172f;
  --muted: #5e6680;
  --paper: #f8f9ff;
  --line: #dce0ef;
  --night: #090b20;
  --night-2: #111539;
  --violet: #725cff;
  --cyan: #37d7f0;
  --coral: #ff8078;
  --max: 1050px;
  --header-h: 76px;
  font-family: Inter, "Helvetica Neue", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: var(--ink);
  background: var(--paper);
  scroll-behavior: smooth;
  scroll-padding-top: 0;
}

* { box-sizing: border-box; }
html, body { overflow-x: hidden; }
body { margin: 0; padding-top: var(--header-h); background: var(--paper); font-size: 17px; line-height: 1.8; }
body.menu-open { overflow: hidden; }
a { color: inherit; }
button { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 200; padding: 10px 16px; color: #fff; background: #000; }
.skip-link:focus { top: 12px; }

.site-header { position: fixed; left: 0; right: 0; top: 0; z-index: 100; height: var(--header-h); color: #fff; background: rgba(7,9,30,.92); border-bottom: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(18px); }
.nav-shell { max-width: var(--max); height: 100%; margin: auto; padding: 0 24px; display: flex; align-items: center; gap: 32px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; line-height: 1; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.55); border-radius: 50%; color: var(--cyan); font-weight: 900; letter-spacing: -.06em; }
.brand b { display: block; font-size: 13px; letter-spacing: .13em; }
.brand small { display: block; margin-top: 7px; color: #a9b0d0; font-size: 10px; letter-spacing: .3em; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.site-nav a { position: relative; padding: 8px 0; color: #d9ddf2; font-size: 14px; font-weight: 700; text-decoration: none; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 1px; height: 2px; background: linear-gradient(90deg,var(--cyan),var(--violet)); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-button { display: none; margin-left: auto; padding: 8px; background: transparent; border: 0; }
.menu-button > span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 5px 0; background: #fff; }

.hero { position: relative; min-height: clamp(560px,72vh,720px); display: grid; align-items: center; overflow: hidden; color: #fff; background: radial-gradient(circle at 83% 48%,rgba(55,215,240,.09),transparent 26%),radial-gradient(circle at 70% 70%,rgba(114,92,255,.1),transparent 30%),var(--night); }
.hero-media { position: absolute; inset: 0; background-image: linear-gradient(180deg,#090b20 0%,rgba(9,11,32,.88) 7%,rgba(9,11,32,0) 22%,rgba(9,11,32,0) 76%,rgba(9,11,32,.82) 91%,#090b20 100%),linear-gradient(90deg,#090b20 0%,rgba(9,11,32,.96) 13%,rgba(9,11,32,.66) 27%,rgba(9,11,32,0) 46%),url("../../img/hero-ai-platform.png"); background-position: calc(100% + 8px) center; background-size: clamp(740px,60vw,1180px) auto; background-repeat: no-repeat; opacity: .94; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg,rgba(6,8,28,1) 0%,rgba(7,9,30,.98) 40%,rgba(8,10,32,.86) 54%,rgba(8,9,28,.38) 70%,rgba(8,9,28,.08) 100%),linear-gradient(0deg,rgba(7,8,28,.96) 0%,rgba(7,8,28,.46) 17%,transparent 38%); }
.hero-inner { position: relative; width: min(var(--max),calc(100% - 48px)); margin: auto; padding: 64px 0 52px; }
.eyebrow { margin: 0 0 18px; color: var(--cyan); font-size: 12px; font-weight: 800; letter-spacing: .28em; }
.hero h1 { margin: 0; max-width: 620px; font-size: clamp(44px,5.5vw,72px); line-height: 1.1; letter-spacing: -.05em; }
.hero h1 span { display: block; margin-bottom: 10px; color: #c8bfff; font-size: .35em; letter-spacing: .08em; }
.hero .hero-title { width: min(787px,80vw); max-width: none; line-height: 0; }
.hero-title img { display: block; width: 100%; height: auto; }
.hero-lead { margin: 26px 0 34px; max-width: 580px; color: #d8ddf4; font-size: clamp(15px,1.5vw,19px); line-height: 1.9; }
.hero-meta { max-width: 800px; margin-top: 34px; display: grid; grid-template-columns: 1.1fr 1fr; border: 1px solid rgba(255,255,255,.26); background: rgba(7,9,31,.4); box-shadow: 0 14px 38px rgba(2,4,18,.16); -webkit-backdrop-filter: blur(9px) saturate(1.08); backdrop-filter: blur(9px) saturate(1.08); }
.hero-meta > div { position: relative; padding: 19px 24px; }
.hero-meta > div + div { border-left: 1px solid rgba(255,255,255,.16); }
.hero-meta > div.is-primary::before { content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px; background: linear-gradient(90deg,var(--violet),var(--cyan)); }
.hero-meta small, .hero-meta strong, .hero-meta span { display: block; }
.hero-meta small { color: #aeb5d5; font-size: 10px; font-weight: 800; letter-spacing: .14em; }
.hero-meta .hero-event-label { display: flex; align-items: baseline; gap: 10px; color: #fff; letter-spacing: 0; }
.hero-event-label b { font-size: clamp(20px,2.2vw,27px); line-height: 1.25; letter-spacing: .02em; }
.hero-event-label i { color: var(--cyan); font-size: 10px; font-style: normal; letter-spacing: .14em; white-space: nowrap; }
.hero-meta strong { margin-top: 2px; font-size: clamp(23px,3vw,34px); line-height: 1.35; letter-spacing: -.03em; }
.hero-meta em { color: var(--cyan); font-size: .38em; font-style: normal; letter-spacing: .1em; }
.hero-meta span { color: #cfd5ec; font-size: 14px; }
.hero-meta .hero-venue { margin-top: 7px; color: #fff; font-weight: 700; line-height: 1.45; }
.hero-meta .hero-format { margin-top: 3px; color: #aeb5d5; font-size: 12px; }
.organizer { margin: 22px 0 0; color: #b7bdd5; font-size: 15px; }

.section { padding: 86px max(24px,calc((100% - var(--max))/2)); }
.section-light { background: #fff; }
.section-tint { background: linear-gradient(140deg,#f1f4ff,#faf9ff 55%,#f0fbfd); }
.section-dark { color: #fff; background: radial-gradient(circle at 90% 12%,rgba(114,92,255,.22),transparent 30%),var(--night); }
.section-accent { color: #fff; background: linear-gradient(135deg,#34257d 0%,#4030a0 48%,#146c85 100%); }
.section-contact { color: #fff; background: #11152e; }
.section-heading { margin-bottom: 38px; }
.section-heading p { margin: 0 0 8px; color: var(--violet); font-size: 11px; font-weight: 900; letter-spacing: .25em; }
.section-dark .section-heading p, .section-accent .section-heading p, .section-contact .section-heading p { color: var(--cyan); }
.section-heading h2 { margin: 0; font-size: clamp(30px,3.5vw,44px); line-height: 1.25; letter-spacing: -.035em; }
.section-heading h2::after { content: ""; display: block; width: 74px; height: 4px; margin-top: 22px; background: linear-gradient(90deg,var(--violet),var(--cyan)); }
.outline-copy { position: relative; width: 100%; padding: 42px 46px 30px; overflow: hidden; font-size: 18px; background: linear-gradient(135deg,#f8f7ff 0%,#f3f9ff 64%,#effcfd 100%); border: 1px solid #dfe2f1; border-left: 5px solid var(--violet); box-shadow: 0 18px 52px rgba(29,37,74,.1); }
.outline-copy::after { content: "AI SAFETY"; position: absolute; right: -8px; bottom: -26px; color: rgba(114,92,255,.055); font-size: clamp(52px,8vw,94px); font-weight: 900; letter-spacing: -.05em; line-height: 1; pointer-events: none; }
.outline-copy p { margin: 0 0 1.4em; }
.outline-copy p:last-child { margin-bottom: 0; }
.section-intro { max-width: 820px; margin: -24px 0 46px; color: var(--muted); font-size: 18px; }

.event-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: stretch; }
.event-card { position: relative; padding: 32px; overflow: hidden; background: #fff; border: 1px solid var(--line); border-top: 4px solid #9ba4c5; box-shadow: 0 14px 40px rgba(17,23,47,.07); }
.event-card-main { color: var(--ink); background: #fff; border-color: var(--line); border-top-color: var(--violet); transform: none; }
.event-card-label { margin-bottom: 35px; color: var(--violet); font-size: 10px; font-weight: 900; letter-spacing: .2em; }
.event-card-main .event-card-label { color: var(--violet); }
.event-kicker { margin: 0 0 10px; color: var(--muted); font-size: 15px; font-weight: 800; }
.event-card-main .event-kicker { color: var(--muted); }
.event-card h3 { min-height: 104px; margin: 0 0 30px; font-size: clamp(23px,2.6vw,34px); line-height: 1.4; }
.event-card dl { margin: 0; }
.event-card dl > div { display: grid; grid-template-columns: 72px 1fr; gap: 14px; padding: 17px 0; border-top: 1px solid var(--line); }
.event-card-main dl > div { border-color: var(--line); }
.event-card dt { color: var(--muted); font-size: 14px; font-weight: 800; }
.event-card-main dt { color: var(--muted); }
.event-card dd { margin: 0; font-weight: 700; line-height: 1.6; }
.funding-note { margin: 32px 0 0; padding: 17px 20px; border-left: 4px solid var(--violet); background: rgba(255,255,255,.78); color: #3f4662; font-size: 15px; }

.program-section { display: flex; flex-direction: column; }
.program-section .section-heading { order: 1; }
.program-section .section-heading p { color: var(--violet); }
.program-note { order: 2; margin: -20px 0 28px; color: var(--muted); font-size: 17px; }
.program-tabs { order: 3; }
#panel-sub { order: 4; }
#panel-main { order: 5; }
.program-tabs { display: grid; grid-template-columns: 1fr 1.25fr; gap: 10px; margin-bottom: 24px; }
.program-tabs a { padding: 16px 20px; color: var(--ink); text-align: left; text-decoration: none; background: #f4f5fb; border: 1px solid var(--line); border-left: 4px solid #9ba4c5; font-size: 17px; font-weight: 800; }
.program-tabs a[href="#panel-main"] { border-left-color: var(--violet); }
.program-tabs a small { display: block; margin-bottom: 3px; color: var(--violet); font-size: 10px; letter-spacing: .18em; }
.program-panel { margin-top: 34px; border: 1px solid var(--line); background: #fff; scroll-margin-top: calc(var(--header-h) + 36px); }
.program-panel-main { border-top: 4px solid var(--violet); }
.program-panel-sub { border-top: 4px solid #9ba4c5; }
.program-panel-head { display: flex; justify-content: space-between; gap: 24px; padding: 26px 30px; background: #f7f8fd; border-bottom: 1px solid var(--line); }
.program-panel-head small { color: var(--violet); font-size: 10px; font-weight: 800; letter-spacing: .16em; }
.program-panel-head h3 { max-width: 670px; margin: 4px 0 0; font-size: clamp(22px,3vw,32px); line-height: 1.4; }
.program-panel-head p { margin: 0; color: var(--muted); text-align: right; font-size: 15px; }
.program-panel-sub .program-panel-head h3 { max-width: none; font-size: clamp(22px,2vw,28px); letter-spacing: -.02em; }
@media (min-width: 960px) {
  .program-panel-sub .program-panel-head h3 { white-space: nowrap; }
  .program-panel-head p { flex: 0 0 auto; }
}
.schedule-row { display: grid; grid-template-columns: 145px 1fr; gap: 24px; padding: 18px 30px; border-bottom: 1px solid var(--line); }
.schedule-row:last-child { border-bottom: 0; }
.schedule-row time { color: var(--violet); font-size: 15px; font-weight: 800; }
.schedule-row time small { display: block; color: var(--coral); font-size: 12px; }
.schedule-row strong, .schedule-row span { display: block; }
.schedule-row strong { line-height: 1.55; }
.schedule-row span { margin-top: 4px; color: var(--muted); font-size: 15px; }
.company-presentations span + span { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--line); }
.company-presentations span b { color: var(--ink); }
.schedule-row.feature { background: #f7f5ff; }
.schedule-row.feature strong { color: #342876; }
.schedule-row.break { color: #236a78; background: #f0fbfd; }

.registration-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; align-items: center; }
.registration-layout h3 { margin: 0 0 12px; font-size: clamp(24px,3vw,36px); }
.registration-layout p { margin: 0 0 28px; color: var(--muted); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 24px; font-weight: 800; text-decoration: none; border: 1px solid transparent; }
.button-disabled { color: #747b98; background: #e7e9f2; border-color: #d4d8e7; cursor: not-allowed; }
.registration-button { color: #fff; background: linear-gradient(100deg,#5140c5,#186f88); box-shadow: 0 12px 28px rgba(72,57,178,.2); }
.registration-button:hover, .registration-button:focus-visible { background: linear-gradient(100deg,#4535b2,#115f76); }
.registration-layout .registration-external-note { margin: 12px 0 0; color: #646b80; font-size: 13px; line-height: 1.6; }
.registration-options { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.registration-options li { display: flex; align-items: center; gap: 22px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.registration-options li > span { color: var(--violet); font-size: 13px; font-weight: 900; }
.registration-options strong, .registration-options small { display: block; }
.registration-options small { margin-top: 3px; color: var(--muted); font-size: 15px; }
.registration-caution { margin: 34px 0 0; padding: 15px 18px; color: #4a516c; background: #fff; border-left: 4px solid var(--violet); font-size: 15px; }

.venue-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.venue-card { padding: 36px; background: #f7f8ff; border: 1px solid var(--line); }
.venue-card-primary { background: #fff; border-top: 5px solid var(--violet); box-shadow: 0 24px 60px rgba(17,23,47,.09); }
.venue-day { margin-bottom: 25px; color: var(--violet); font-size: 12px; font-weight: 900; letter-spacing: .12em; }
.venue-day span { margin-left: 8px; color: var(--muted); font-size: 9px; }
.venue-card h3 { min-height: 86px; margin: 0 0 22px; font-size: clamp(23px,2.7vw,32px); line-height: 1.45; }
.venue-card address { min-height: 110px; font-style: normal; font-weight: 700; }
.venue-card ul { min-height: 108px; margin: 18px 0 25px; padding: 18px 0 0 1.3em; color: var(--muted); border-top: 1px solid var(--line); font-size: 15px; }
.map-frame { position: relative; width: 100%; aspect-ratio: 16 / 10; margin: 0 0 22px; overflow: hidden; background: #e9ecf4; border: 1px solid var(--line); }
.map-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.venue-actions { display: flex; flex-wrap: wrap; gap: 18px; }
.text-link { color: #3d31a6; font-size: 14px; font-weight: 800; text-decoration: none; border-bottom: 1px solid #a9a2e9; }

.history-links { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.history-links a { display: grid; grid-template-columns: 92px 1fr 20px; align-items: center; gap: 18px; min-height: 104px; padding: 20px; text-decoration: none; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .2s ease,transform .2s ease; }
.history-links a:hover { background: #fff; transform: translateY(-2px); }
.history-links small { color: var(--violet); font-weight: 800; }
.history-links strong { line-height: 1.5; }
.history-links span { color: var(--violet); font-size: 20px; }

.contact-box { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 38px; border: 1px solid rgba(255,255,255,.16); background: linear-gradient(120deg,rgba(114,92,255,.16),rgba(55,215,240,.07)); }
.contact-box small { color: var(--cyan); font-size: 10px; font-weight: 800; letter-spacing: .18em; }
.contact-box h3 { margin: 7px 0 6px; font-size: clamp(20px,2.5vw,30px); }
.contact-box p { margin: 0; color: #b8bfd9; }
.contact-box p a { color: var(--cyan); overflow-wrap: anywhere; }
.contact-button { min-width: 300px; padding: 18px 24px; justify-content: space-between; color: #071020; background: linear-gradient(105deg,#49e3f4,#83f0db); border: 2px solid rgba(255,255,255,.85); box-shadow: 0 12px 30px rgba(35,214,235,.28); font-size: 16px; }
.contact-button b { margin-left: 18px; font-size: 21px; line-height: 1; transition: transform .2s ease; }
.contact-button:hover, .contact-button:focus-visible { color: #071020; background: linear-gradient(105deg,#7deaf7,#a0f5e4); box-shadow: 0 16px 36px rgba(35,214,235,.4); transform: translateY(-2px); }
.contact-button:hover b, .contact-button:focus-visible b { transform: translate(3px,-3px); }

.site-footer { padding: 52px 24px; color: #c4cae2; background: #07091d; }
.footer-inner { max-width: var(--max); margin: auto; }
.footer-org { display: flex; align-items: center; gap: 28px; }
.footer-org > span { color: #7f88a7; font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.footer-org img { width: 190px; height: auto; padding: 8px; background: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; margin-top: 35px; padding-top: 25px; border-top: 1px solid rgba(255,255,255,.12); }
.footer-bottom small { font-size: 10px; }
.footer-bottom a { color: var(--cyan); font-size: 11px; font-weight: 800; text-decoration: none; }

@media (max-width: 900px) {
  :root { --header-h: 68px; }
  .menu-button { display: block; }
  .site-nav { position: fixed; left: 0; right: 0; top: var(--header-h); height: calc(100svh - var(--header-h)); padding: 36px 24px; display: flex; flex-direction: column; align-items: stretch; gap: 0; background: rgba(7,9,30,.98); visibility: hidden; pointer-events: none; transform: translateX(100%); transition: transform .25s ease,visibility 0s linear .25s; }
  .site-nav.open { visibility: visible; pointer-events: auto; transform: translateX(0); transition-delay: 0s; }
  .site-nav a { padding: 18px 4px; font-size: 17px; border-bottom: 1px solid rgba(255,255,255,.12); }
  .hero { min-height: 720px; align-items: end; }
  .hero-media { background-position: 80% 38px; background-size: auto 42%; opacity: .84; filter: none; }
  .hero-shade { background: linear-gradient(0deg,rgba(6,8,28,.98) 10%,rgba(8,10,32,.9) 58%,rgba(8,9,28,.38) 100%); }
  .hero-inner { padding: 180px 0 48px; }
  .hero h1 { font-size: clamp(40px,9vw,64px); }
  .event-grid,.registration-layout { grid-template-columns: 1fr; }
  .program-panel-head { display: block; }
  .program-panel-head p { margin-top: 15px; text-align: left; }
  .venue-grid { grid-template-columns: 1fr; }
  .venue-card h3,.venue-card address,.venue-card ul { min-height: 0; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav-shell { padding: 0 16px; }
  .brand b { font-size: 11px; }
  .section { padding: 78px 20px; }
  .hero-inner { width: calc(100% - 40px); }
  .hero h1 { letter-spacing: -.065em; }
  .hero .hero-title { width: 100%; }
  .hero-meta { grid-template-columns: 1fr; }
  .hero-meta > div + div { border-left: 0; border-top: 1px solid rgba(255,255,255,.16); }
  .desktop-only { display: none; }
  .event-card { padding: 28px 24px; }
  .outline-copy { padding: 28px 24px 18px; font-size: 16px; }
  .event-card h3 { min-height: 0; }
  .program-tabs { grid-template-columns: 1fr 1fr; }
  .program-tabs a { padding: 16px 12px; font-size: 15px; }
  .program-panel-head { padding: 24px 20px; }
  .schedule-row { grid-template-columns: 1fr; gap: 6px; padding: 18px 20px; }
  .schedule-row time { color: var(--cyan); }
  .registration-layout { gap: 42px; }
  .venue-card { padding: 28px 22px; }
  .history-links { grid-template-columns: 1fr; }
  .history-links a { border-right: 0; grid-template-columns: 78px 1fr 16px; padding: 16px 4px; }
  .contact-box { display: block; padding: 28px 22px; }
  .contact-box .button { margin-top: 24px; width: 100%; }
  .contact-button { min-width: 0; }
  .footer-org { align-items: flex-start; flex-direction: column; gap: 12px; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
  *,*::before,*::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}