:root {
  color-scheme: light;
  --ink: #171717;
  --muted: #5e6268;
  --subtle: #8a8f98;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --line: #dedbd2;
  --line-strong: #c9c3b5;
  --accent: #0f766e;
  --accent-dark: #0b514c;
  --accent-soft: #dcebe8;
  --mark: #c2410c;
  --mark-soft: #f5e1d2;
  --blue: #1d4e89;
  --shadow: 0 18px 44px rgba(27, 31, 35, 0.09);
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    "Inter", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 14px clamp(20px, 4vw, 56px);
  border-bottom: 1px solid rgba(222, 219, 210, 0.84);
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(16px);
}

.site-header[data-elevated="true"] {
  box-shadow: 0 10px 28px rgba(27, 31, 35, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--accent-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  font-weight: 700;
}

.brand-title,
.brand-subtitle {
  display: block;
}

.brand-title {
  font-size: 17px;
  font-weight: 750;
  line-height: 1.2;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.trial-notice {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  width: min(var(--max), calc(100% - 40px));
  margin: 18px auto 0;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--mark);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(27, 31, 35, 0.06);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.trial-notice strong {
  color: var(--ink);
}

.trial-notice a {
  color: var(--accent-dark);
  font-weight: 750;
}

.hero,
.section,
.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 34px;
  align-items: end;
  min-height: calc(100vh - 76px);
  padding: 72px 0 64px;
}

.hero-inner {
  max-width: 790px;
}

.eyebrow,
.panel-kicker {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 13.2em;
  margin: 0;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

h1 span {
  display: block;
}

.hero-copy {
  max-width: 760px;
  margin: 28px 0 0;
  color: #3a3d41;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 750;
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  color: #fff;
}

.button-primary:hover {
  background: var(--accent-dark);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.next-panel {
  align-self: center;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.next-panel h2 {
  margin: 0 0 18px;
  font-size: 30px;
  line-height: 1.2;
}

.text-link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--accent-dark);
  font-weight: 800;
}

.section {
  scroll-margin-top: 96px;
  padding: 76px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 42px;
}

.lede {
  max-width: 720px;
  font-size: 18px;
}

.lede p {
  margin: 0 0 18px;
}

.topic-cloud {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 10px;
}

.topic-cloud span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: #303337;
  font-size: 13px;
  font-weight: 700;
}

.section-accent {
  width: 100%;
  max-width: none;
  padding-inline: max(20px, calc((100% - var(--max)) / 2));
  background: #edf4f2;
}

.event-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 28px;
  align-items: start;
}

.fact-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.fact-list div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 17px 0;
  border-bottom: 1px solid rgba(15, 118, 110, 0.18);
}

.fact-list dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.fact-list dd {
  margin: 0;
  font-weight: 700;
}

.fact-list.compact {
  gap: 0;
}

.fact-list.compact div {
  grid-template-columns: 72px minmax(0, 1fr);
  padding: 10px 0;
}

.status-box {
  padding: 24px;
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.status-box h3,
.seminar-list h3,
.contact-grid h3 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.3;
}

.status-box ul,
.seminar-list ul {
  margin: 0 0 18px;
  padding-left: 1.2em;
}

.status-box p,
.seminar-list p,
.contact-grid p {
  margin: 0 0 14px;
}

.event-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.event-card,
.seminar-list article,
.contact-grid > div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.event-card {
  display: flex;
  flex-direction: column;
  min-height: 300px;
  padding: 22px;
}

.event-card[data-upcoming="true"] {
  border-color: rgba(194, 65, 12, 0.46);
  background: linear-gradient(180deg, #fff, #fff8f3);
}

.event-card h3 {
  margin: 0 0 10px;
  font-size: 24px;
  line-height: 1.25;
}

.event-card h3 a {
  text-decoration: none;
}

.event-card h3 a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.event-meta {
  display: grid;
  gap: 4px;
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.event-theme {
  margin: 0 0 18px;
  color: #303337;
}

.event-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.event-detail-link {
  margin-top: 18px;
}

.stat {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
}

.section-quiet {
  background: transparent;
}

.seminar-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.seminar-list article {
  padding: 24px;
}

.contact-section {
  padding-bottom: 88px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.contact-grid > div {
  padding: 24px;
}

.contact-grid a:not(.button) {
  color: var(--accent-dark);
  font-weight: 700;
}

.detail-hero {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
  padding: 72px 0 42px;
}

.detail-hero h1 {
  max-width: 9.5em;
  font-size: clamp(42px, 6vw, 72px);
}

.detail-copy {
  max-width: 780px;
  margin: 24px 0 0;
  color: #3a3d41;
  font-size: 18px;
}

.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.detail-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 38px;
  align-items: start;
}

.detail-toc {
  position: sticky;
  top: 104px;
  display: grid;
  gap: 6px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.detail-toc a {
  padding: 6px 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
}

.detail-toc a:hover {
  color: var(--accent-dark);
}

.detail-content {
  display: grid;
  gap: 26px;
}

.detail-block {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.detail-block h2,
.detail-block h3 {
  margin: 0 0 16px;
  line-height: 1.28;
}

.detail-block h2 {
  font-size: clamp(26px, 3vw, 36px);
}

.detail-block h3 {
  font-size: 22px;
}

.detail-block p {
  margin: 0 0 14px;
}

.detail-block p:last-child,
.detail-block ul:last-child,
.detail-block ol:last-child {
  margin-bottom: 0;
}

.detail-block a {
  color: var(--accent-dark);
  font-weight: 700;
}

.compact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.mini-fact {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfaf7;
}

.mini-fact span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.mini-fact strong {
  display: block;
  margin-top: 5px;
  font-size: 18px;
  line-height: 1.35;
}

.schedule-list,
.talk-detail-list,
.link-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.schedule-list li,
.talk-detail,
.link-list li {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfaf7;
}

.schedule-time,
.talk-meta {
  display: block;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 850;
}

.talk-detail h3 {
  margin-top: 4px;
}

.people-list {
  columns: 3 180px;
  column-gap: 30px;
  margin: 0;
  padding-left: 1.2em;
}

.people-list li {
  break-inside: avoid;
  margin: 0 0 5px;
}

.source-note {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 56px;
  }

  .next-panel {
    width: 100%;
  }

  .section-heading,
  .about-grid,
  .event-feature,
  .detail-layout,
  .seminar-list,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .detail-toc {
    position: static;
  }

  .compact-grid {
    grid-template-columns: 1fr;
  }

  .event-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .hero,
  .section,
  .detail-hero,
  .site-footer {
    width: min(var(--max), calc(100% - 28px));
  }

  .site-header {
    min-height: auto;
    padding: 12px 14px;
  }

  .brand {
    min-width: 0;
  }

  .site-nav {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .site-nav a {
    justify-content: center;
    padding: 0 8px;
  }

  .hero {
    padding: 42px 0 54px;
  }

  h1 {
    font-size: 40px;
  }

  .hero-copy,
  .lede {
    font-size: 16px;
  }

  .hero-actions,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .event-grid {
    grid-template-columns: 1fr;
  }

  .fact-list div,
  .fact-list.compact div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}