:root {
  --bg: #FFFFFF;
  --bg-alt: #F6F7F8;
  --bg-card: #FFFFFF;
  --ink: #0A0A0A;
  --ink-2: #333333;
  --ink-3: #6B7280;
  --ink-4: #A0A6AE;
  --accent: #0FE6A5;
  --accent-dark: #0AB77E;
  --border: #E5E7EB;
  --border-strong: #0A0A0A;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Inter", "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  padding-top: 102px;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 32px; }
a { color: inherit; }

/* Wi-Fi Bar (fixed top) */
.wifi-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1100;
  background: var(--ink);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 10px 24px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.wifi-bar .dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }
.wifi-bar strong { color: var(--accent); font-weight: 600; letter-spacing: 0.05em; }
.wifi-bar .sep { opacity: 0.3; }

/* Nav */
nav.topnav {
  padding: 18px 0;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 42px;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.logo {
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.logo-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}
.nav-links { display: flex; gap: 28px; font-size: 0.88rem; font-weight: 500; }
.nav-links a { color: var(--ink-2); text-decoration: none; transition: color 0.2s; }
.nav-links a:hover { color: var(--accent-dark); }
.nav-links a.active { color: var(--accent-dark); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.1rem;
}

/* Hero */
.hero { padding: 90px 0 40px; }
#about { padding-top: 0; }
.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 32px;
}
.hero-label::before { content: ""; width: 24px; height: 2px; background: var(--accent); }
.hero-title {
  font-size: 6rem;
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin-bottom: 36px;
  text-transform: uppercase;
  color: var(--ink);
}
.hero-title .line { display: block; }
.hero-title .accent-dot { color: var(--accent); }
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--ink-2);
  max-width: 620px;
  margin-bottom: 48px;
  line-height: 1.7;
}
.countdown {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--ink-3);
  margin-bottom: 40px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.countdown .num { font-size: 1.5rem; font-weight: 700; color: var(--ink); margin-left: 4px; }
.countdown .accent { color: var(--accent-dark); font-weight: 700; }
.hero-date-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin: 12px 0 36px;
  padding-top: 18px;
  border-top: 2px solid var(--ink);
  flex-wrap: wrap;
}
.hero-date {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0;
  line-height: 1;
}
.hero-date .sep {
  color: var(--accent-dark);
  font-weight: 500;
  font-size: 1.6rem;
  margin: 0 -2px;
}
.hero-date .day {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-left: 6px;
}
.hero-venue-tag {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-venue-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* Sections */
section { padding: 80px 0; }
.section-head { margin-bottom: 24px; display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
}
.section-label::before { content: ""; width: 20px; height: 1px; background: var(--ink-3); }
.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.section-title-en {
  font-size: 3rem;
  letter-spacing: 0.02em;
  font-weight: 800;
}
.section-title-en::after {
  content: ".";
  color: var(--accent);
  margin-left: 2px;
}
.section-lead { font-size: 1rem; color: var(--ink-3); max-width: 380px; line-height: 1.75; }

/* About */
.about-intro {
  max-width: 720px;
  margin: 0 0 56px;
}
.about-intro .lead {
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin-bottom: 20px;
}
.about-intro p:not(.lead) { font-size: 1rem; line-height: 2; color: var(--ink-3); }
.about-facts {
  display: grid;
  grid-template-columns: 130px 1fr;
  row-gap: 10px;
  column-gap: 32px;
  margin: 28px 0 0;
  max-width: 620px;
}
.about-facts dt {
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-dark);
  font-weight: 700;
  align-self: center;
  margin: 0;
}
.about-facts dd {
  font-size: 1.15rem;
  color: var(--ink);
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.01em;
}
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--border-strong); border-bottom: 1px solid var(--border-strong); }
.card { padding: 40px 28px; border-right: 1px solid var(--border); transition: background 0.2s; }
.card:last-child { border-right: none; }
.card:hover { background: var(--bg-alt); }
.card-num { font-size: 0.78rem; font-weight: 600; color: var(--accent-dark); letter-spacing: 0.08em; margin-bottom: 14px; }
.card h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 14px; letter-spacing: -0.01em; }
.card p { font-size: 0.94rem; color: var(--ink-2); line-height: 1.75; }

/* Schedule */
.schedule-section { background: var(--bg-alt); }
.schedule-tabs { display: inline-flex; background: var(--ink); padding: 6px; border-radius: 999px; margin-bottom: 40px; }
.tab {
  padding: 14px 36px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  background: transparent;
  border: none;
  font-family: inherit;
}
.tab.active { background: var(--accent); color: var(--ink); }

.tab-pane { display: none; }
.tab-pane.active { display: block; }

.schedule-list { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.sch-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--border);
  align-items: center;
  transition: background 0.2s;
}
.sch-item:last-child { border-bottom: none; }
.sch-item:hover { background: var(--bg-alt); }
.sch-time { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em; }
.sch-content h4 { font-size: 1rem; font-weight: 600; margin-bottom: 2px; letter-spacing: -0.005em; }
.sch-content .desc { font-size: 0.86rem; color: var(--ink-3); }

/* Venue */
.venue-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start; }
.venue-img {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-alt);
}
.venue-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.venue-info h3 { font-size: 1.9rem; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.02em; }
.venue-description { color: var(--ink-2); line-height: 1.9; margin-bottom: 28px; font-size: 0.95rem; }
.venue-info .info-table { width: 100%; }
.info-table .row { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 13px 0; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.info-table .row:last-child { border-bottom: none; }
.info-table .key { font-weight: 600; color: var(--ink-3); font-size: 0.82rem; letter-spacing: 0.04em; }
.info-table .val { font-weight: 500; }

/* Access */
.access-section { margin-top: 80px; }
.access-wrap { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 40px 36px; }
.access-inner { margin-top: 20px; }
.access-col h5 {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-dark);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.access-col ul { list-style: none; }
.access-col ul li { padding: 8px 0 8px 16px; border-left: 2px solid var(--border); margin-left: 4px; font-size: 0.9rem; color: var(--ink-2); }
.access-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; margin-top: 20px; }
.access-note { font-size: 0.82rem; color: var(--ink-3); margin-top: 20px; padding-top: 16px; border-top: 1px dashed var(--border); }

/* Amenities */
.amenities-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.amenity-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 28px 24px;
  border-radius: 8px;
  transition: all 0.2s;
}
.amenity-card:hover { border-color: var(--ink); }
.amenity-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.amenity-card h4 i { color: var(--accent-dark); font-size: 1.1rem; }
.amenity-list { list-style: none; }
.amenity-list li {
  font-size: 0.88rem;
  color: var(--ink-2);
  padding: 7px 0;
  padding-left: 16px;
  position: relative;
  border-bottom: 1px solid var(--border);
}
.amenity-list li:last-child { border-bottom: none; }
.amenity-list li::before {
  content: "—";
  color: var(--accent);
  position: absolute;
  left: 0;
  font-weight: 600;
}
.amenities-note { font-size: 0.85rem; color: var(--ink-3); margin-top: 24px; text-align: center; }

/* Participants */
.participants-note { font-size: 0.88rem; color: var(--ink-3); margin-bottom: 32px; text-align: center; }
.participants-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.participant-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 20px 16px;
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.participant-card:hover { border-color: var(--ink); }
.participant-card h5 { font-size: 0.98rem; font-weight: 700; margin-bottom: 4px; letter-spacing: -0.01em; }
.participant-card .org { font-size: 0.78rem; color: var(--ink-3); line-height: 1.5; }
.participant-card .room {
  font-size: 0.78rem;
  color: var(--accent-dark);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all 0.3s;
}
.participant-card.show .room {
  max-height: 40px;
  opacity: 1;
}
.participant-card.is-target {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 230, 165, 0.18);
  animation: participant-pulse 0.6s ease-out;
}
@keyframes participant-pulse {
  0% { transform: scale(1); }
  40% { transform: scale(1.04); }
  100% { transform: scale(1); }
}

/* Participant Search */
.participant-search {
  position: relative;
  max-width: 520px;
  margin: 0 auto 36px;
}
.participant-search input {
  width: 100%;
  padding: 14px 44px 14px 46px;
  font-size: 1rem;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  background: #fff;
  font-family: inherit;
  color: var(--ink);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.participant-search input:focus {
  outline: none;
  border-color: var(--accent-dark);
  box-shadow: 0 0 0 3px rgba(15, 230, 165, 0.15);
}
.participant-search .search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  font-size: 1.1rem;
  pointer-events: none;
}
.participant-search .clear-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--ink-3);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 6px 8px;
  line-height: 1;
  display: none;
  border-radius: 50%;
}
.participant-search .clear-btn:hover { background: var(--bg-alt); color: var(--ink); }
.participant-search.has-value .clear-btn { display: block; }
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  max-height: 360px;
  overflow-y: auto;
  display: none;
  box-shadow: 0 12px 32px rgba(10,10,10,0.08);
  z-index: 50;
}
.search-results.open { display: block; }
.search-results button {
  display: block;
  width: 100%;
  padding: 14px 20px;
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--ink);
  transition: background 0.15s;
}
.search-results button:last-child { border-bottom: none; }
.search-results button:hover,
.search-results button.is-active { background: var(--bg-alt); }
.search-results .result-name { font-weight: 600; }
.search-results .result-org { display: block; font-size: 0.8rem; color: var(--ink-3); margin-top: 3px; }
.search-results .empty { padding: 16px 20px; color: var(--ink-3); font-size: 0.9rem; text-align: center; }

/* Participants Preview */
.participant-card.is-preview { cursor: default; }
.participant-card.is-preview:hover { border-color: var(--border); }
.preview-cta {
  display: flex;
  justify-content: center;
  margin-top: 36px;
}
.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 36px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.cta-link:hover {
  background: var(--accent);
  color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(10,10,10,0.15);
}
.cta-link i { transition: transform 0.2s; }
.cta-link:hover i { transform: translateX(4px); }

/* FAQ */
.faq-section { background: var(--bg-alt); }
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-q {
  width: 100%;
  text-align: left;
  padding: 22px 0;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.faq-q .arrow { color: var(--accent-dark); transition: transform 0.2s; font-size: 0.85rem; }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: var(--ink-2);
  font-size: 0.94rem;
  line-height: 1.9;
}
.faq-item.open .faq-a { max-height: 500px; padding-bottom: 22px; }

/* Footer */
footer { padding: 60px 0 40px; border-top: 1px solid var(--border); background: var(--ink); color: #fff; }
.footer-brand { margin-bottom: 40px; }
.footer-brand p:first-child { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.footer-brand p:first-child .accent { color: var(--accent); }
.footer-brand p:last-child { font-size: 0.85rem; color: #9BA0A8; }
.footer-contacts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); }
.footer-contact .label {
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.footer-contact .value { font-size: 0.9rem; }
.footer-contact .value a { color: #fff; text-decoration: none; border-bottom: 1px dotted rgba(255,255,255,0.3); }
.footer-contact .value a:hover { color: var(--accent); }
.footer-copyright { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.8rem; color: #6B7280; text-align: center; }

@media (max-width: 768px) {
  body { padding-top: 84px; font-size: 15px; }

  /* Wi-Fi Bar */
  .wifi-bar { font-size: 0.7rem; padding: 7px 14px; gap: 8px; line-height: 1.5; }
  .wifi-bar .sep { display: none; }

  /* Nav */
  nav.topnav { top: 36px; padding: 12px 0; }
  .logo { font-size: 0.78rem; gap: 8px; }
  .logo-mark { width: 7px; height: 7px; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 18px 20px;
    gap: 16px;
    font-size: 0.95rem;
  }
  .nav-links.open { display: flex; }

  /* Sections */
  section { padding: 56px 0; }
  .container { padding: 0 20px; }
  .section-head { margin-bottom: 20px; }
  .section-title { font-size: 1.7rem; }
  .section-title-en { font-size: 2.2rem; letter-spacing: 0.01em; }

  /* Hero */
  .hero { padding: 48px 0 36px; }
  .hero-label { font-size: 0.7rem; margin-bottom: 22px; letter-spacing: 0.08em; }
  .hero-label::before { width: 18px; }
  .hero-title { font-size: 2.8rem; line-height: 0.96; margin-bottom: 26px; letter-spacing: -0.025em; }
  .hero-date-row { padding-top: 14px; margin: 10px 0 24px; gap: 12px; }
  .hero-date { font-size: 1.55rem; gap: 6px; flex-wrap: wrap; letter-spacing: -0.01em; }
  .hero-date .sep { font-size: 1rem; margin: 0 2px; }

  /* About */
  .about-intro { margin: 0 0 36px; }
  .about-intro .lead { font-size: 1.05rem; line-height: 1.75; margin-bottom: 0; }
  .about-intro p:not(.lead) { font-size: 0.95rem; line-height: 1.85; }
  .about-facts { grid-template-columns: 84px 1fr; column-gap: 16px; row-gap: 10px; margin-top: 22px; }
  .about-facts dt { font-size: 0.7rem; letter-spacing: 0.14em; }
  .about-facts dd { font-size: 0.98rem; line-height: 1.5; }

  /* Cards */
  .cards { grid-template-columns: 1fr; }
  .card { border-right: none; border-bottom: 1px solid var(--border); padding: 26px 4px; }
  .card:last-child { border-bottom: none; }
  .card-num { font-size: 0.74rem; margin-bottom: 10px; }
  .card h3 { font-size: 1.25rem; margin-bottom: 10px; }
  .card p { font-size: 0.92rem; line-height: 1.7; }

  /* Schedule */
  .schedule-tabs { padding: 4px; margin-bottom: 28px; }
  .tab { padding: 10px 16px; font-size: 0.85rem; letter-spacing: 0.02em; }
  .sch-item { grid-template-columns: 1fr; gap: 4px; padding: 16px 18px; }
  .sch-time { font-size: 0.95rem; }
  .sch-content h4 { font-size: 0.95rem; line-height: 1.45; }
  .sch-content .desc { font-size: 0.82rem; line-height: 1.55; }

  /* Venue / Access */
  .venue-grid { grid-template-columns: 1fr; gap: 28px; }
  .venue-img { aspect-ratio: 16 / 10; font-size: 0.78rem; }
  .access-section { margin-top: 56px; }
  .access-grid { grid-template-columns: 1fr; gap: 22px; }
  .access-wrap { padding: 24px 18px; }

  /* Amenities / Participants */
  .amenities-grid { grid-template-columns: 1fr; }
  .participants-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }

  /* Search */
  .participant-search { margin-bottom: 28px; }
  .participant-search input { padding: 12px 40px 12px 42px; font-size: 0.95rem; }

  /* Participants Preview */
  .preview-cta { margin-top: 28px; }
  .cta-link { padding: 14px 28px; font-size: 0.92rem; }

  /* Footer */
  .footer-contacts { grid-template-columns: 1fr; gap: 18px; }
}

/* Narrow phones */
@media (max-width: 480px) {
  .hero-title { font-size: 2.3rem; }
  .hero-date { font-size: 1.35rem; }
  .section-title-en { font-size: 1.9rem; }
  .about-facts { grid-template-columns: 72px 1fr; column-gap: 12px; }
  .about-facts dt { font-size: 0.66rem; }
  .about-facts dd { font-size: 0.92rem; }
  .tab { padding: 9px 12px; font-size: 0.8rem; }
  .card h3 { font-size: 1.18rem; }
  .participants-grid { grid-template-columns: 1fr; }
}