:root {
  --lec-black: #17151a;
  --lec-purple-dark: #532774;
  --lec-purple-soft: #f3ecf8;
  --lec-purple-line: rgba(103, 48, 142, 0.16);
  --lec-green: #71a783;
  --lec-gold: #d8b46b;
  --lec-gold-soft: #f2dfb5;
  --lec-bg: #fbf8f3;
  --lec-surface: rgba(255, 255, 255, 0.94);
  --lec-border: rgba(221, 213, 200, 0.9);
  --text-main: #1c1a1f;
  --text-sub: #625a67;
  --shadow-soft: 0 22px 52px rgba(34, 20, 44, 0.08);
  --container: min(1120px, calc(100% - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(103, 48, 142, 0.06), transparent 32%),
    var(--lec-bg);
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.detail-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 78px;
}

.detail-brand {
  display: grid;
  gap: 4px;
  color: var(--lec-surface);
}

.detail-brand-title {
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.detail-brand-day {
  font-size: 24px;
  font-weight: 800;
}

.header-links {
  display: flex;
  align-items: center;
}

.main-session-page {
  padding: 58px 0 88px;
}

.main-session-stack {
  display: grid;
  gap: 28px;
}

.session-hero {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(34px, 5vw, 64px);
  padding: clamp(38px, 5.2vw, 66px);
  border: 1px solid rgba(216, 180, 107, 0.5);
  border-radius: 34px;
  background:
    radial-gradient(circle at 88% 8%, rgba(216, 180, 107, 0.22), transparent 30%),
    linear-gradient(135deg, #24102f 0%, #532774 56%, #2d163d 100%);
  box-shadow: 0 32px 70px rgba(39, 19, 52, 0.22);
  overflow: hidden;
  isolation: isolate;
}

.session-hero::before {
  content: "";
  position: absolute;
  inset: 16px;
  z-index: -1;
  border: 1px solid rgba(242, 223, 181, 0.22);
  border-radius: 24px;
  pointer-events: none;
}

.session-hero::after {
  content: "";
  position: absolute;
  top: -150px;
  right: -110px;
  z-index: -1;
  width: 360px;
  height: 360px;
  border: 1px solid rgba(242, 223, 181, 0.2);
  border-radius: 50%;
  pointer-events: none;
}

.session-hero-copy {
  flex: 1 1 560px;
  min-width: 0;
}

.session-number-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.session-number {
  color: var(--lec-gold-soft);
  font-size: clamp(42px, 5vw, 64px);
  font-weight: 900;
  line-height: 1;
}

.session-label {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.22em;
  opacity: 0.58;
}

.session-title {
  max-width: 16ch;
  margin: 0;
  color: #fff;
  font-size: clamp(34px, 4.8vw, 58px);
  line-height: 1.2;
  letter-spacing: -0.04em;
  overflow-wrap: normal;
}

.session-title-part {
  display: inline-block;
}

.session-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.session-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 48px;
  padding: 9px 15px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

.session-meta-badge--venue {
  border-color: var(--lec-gold);
  background: var(--lec-gold);
  color: #25142f;
}

.session-meta-icon {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
}

.session-venue-note {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
  line-height: 1.8;
  opacity: 0.72;
}

.session-thumbnail {
  flex: 0 1 360px;
  width: min(100%, 360px);
  margin: 0;
}

.session-thumbnail img {
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(242, 223, 181, 0.72);
  border-radius: 22px;
  background: #190d22;
  object-fit: cover;
  object-position: 50% 50%;
  box-shadow: 0 24px 58px rgba(10, 4, 15, 0.4);
}

@media (min-width: 900px) {
  body[data-main-session-id="01"] .session-hero,
  body[data-main-session-id="02"] .session-hero {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 3.1fr);
    gap: clamp(28px, 3.5vw, 48px);
    padding: clamp(36px, 4vw, 52px);
  }

  body[data-main-session-id="01"] .session-hero-copy,
  body[data-main-session-id="02"] .session-hero-copy {
    width: 100%;
  }

  body[data-main-session-id="01"] .session-title,
  body[data-main-session-id="02"] .session-title {
    max-width: none;
    font-size: clamp(30px, 3vw, 42px);
    line-height: 1.22;
  }

  body[data-main-session-id="01"] .session-title {
    font-size: clamp(28px, 2.55vw, 36px);
  }

  body[data-main-session-id="01"] .session-title-part,
  body[data-main-session-id="02"] .session-title-part {
    display: block;
  }

  body[data-main-session-id="01"] .session-thumbnail,
  body[data-main-session-id="02"] .session-thumbnail {
    width: 100%;
    max-width: none;
  }
}

.session-card {
  padding: 30px;
  border: 1px solid var(--lec-border);
  border-radius: 28px;
  background: var(--lec-surface);
  box-shadow: var(--shadow-soft);
}

.session-card::before {
  content: "";
  display: block;
  width: 54px;
  height: 3px;
  margin-bottom: 20px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--lec-gold), var(--lec-purple-dark));
}

.session-section-title {
  margin: 0 0 22px;
  color: var(--lec-purple-dark);
  font-size: clamp(21px, 2.5vw, 28px);
  line-height: 1.4;
}

.session-overview {
  margin: 0 0 26px;
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.9;
}

.session-info-table-wrap {
  overflow-x: auto;
}

.session-info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.7;
}

.session-info-table caption {
  margin-bottom: 12px;
  color: var(--lec-purple-dark);
  font-size: 18px;
  font-weight: 800;
  text-align: left;
}

.session-info-table th,
.session-info-table td {
  padding: 14px 16px;
  border: 1px solid var(--lec-border);
  text-align: left;
  vertical-align: top;
}

.session-info-table th {
  width: 180px;
  background: var(--lec-purple-soft);
  color: var(--lec-purple-dark);
  font-weight: 800;
}

.health-panel-theme {
  margin: 0 0 24px;
  color: var(--lec-purple-dark);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.65;
}

.health-panel-composition {
  margin: 0;
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.9;
}

.health-panel-pillars {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.health-panel-pillar {
  padding: 20px;
  border: 1px solid var(--lec-purple-line);
  border-radius: 18px;
  background: var(--lec-purple-soft);
}

.health-panel-pillar h3 {
  margin: 0;
  color: var(--lec-purple-dark);
  font-size: 17px;
  line-height: 1.6;
}

.session-speakers {
  display: grid;
}

.session-speaker {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  min-width: 0;
  padding: 24px 0;
}

.session-speaker:first-child {
  padding-top: 6px;
}

.session-speaker:last-child {
  padding-bottom: 6px;
}

.session-speaker + .session-speaker {
  border-top: 1px solid var(--lec-border);
}

.session-speaker-photo {
  width: 76px;
  height: 76px;
  border: 1px solid var(--lec-purple-line);
  border-radius: 18px;
  background: var(--lec-purple-soft);
  object-fit: cover;
}

body[data-main-session-id="01"] .session-speaker-photo {
  object-position: 50% 0;
}

body[data-main-session-id="02"] .session-speaker {
  grid-template-columns: 96px minmax(0, 1fr);
}

body[data-main-session-id="02"] .session-speaker-photo {
  width: 96px;
  height: 96px;
  border-radius: 12px;
}

body[data-main-session-id="02"] .session-speaker-profile {
  font-size: 12.5px;
  line-height: 1.85;
}

.session-speaker-photo--placeholder {
  border-style: dashed;
  object-fit: contain;
}

.session-speaker-content {
  min-width: 0;
}

.session-speaker-role {
  margin: 0 0 6px;
  color: var(--lec-purple-dark);
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.66;
}

.session-speaker-name {
  margin: 0;
  color: var(--lec-purple-dark);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.35;
}

.session-speaker-name-kana {
  margin: 2px 0 0;
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.6;
}

.session-speaker-profile {
  margin: 12px 0 0;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.9;
}

.other-session-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  min-height: 112px;
  padding: 22px 26px;
  border: 1px solid var(--lec-purple-line);
  border-radius: 20px;
  background: var(--lec-purple-soft);
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.other-session-link:hover,
.other-session-link:focus-visible {
  border-color: var(--lec-purple-dark);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
  outline: none;
}

.other-session-number {
  color: var(--lec-purple-line);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
}

.other-session-title {
  margin: 0;
  color: var(--lec-purple-dark);
  font-size: clamp(18px, 2.3vw, 25px);
  font-weight: 800;
  line-height: 1.45;
}

.other-session-meta {
  margin: 7px 0 0;
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.72;
}

.other-session-arrow {
  color: var(--lec-purple-dark);
  font-size: 30px;
  line-height: 1;
}

.related-programs {
  padding: 18px 0 0;
}

.related-programs-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.related-programs-eyebrow {
  display: block;
  margin-bottom: 6px;
  color: var(--lec-purple-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.62;
}

.related-programs-title {
  margin: 0;
  color: var(--lec-purple-dark);
  font-size: clamp(26px, 3.4vw, 38px);
}

.related-programs-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.related-program-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  border: 1px solid var(--lec-border);
  border-radius: 22px;
  background: #fff;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.related-program-card:hover,
.related-program-card:focus-visible {
  border-color: rgba(83, 39, 116, 0.48);
  box-shadow: 0 24px 56px rgba(34, 20, 44, 0.13);
  transform: translateY(-3px);
  outline: none;
}

.related-program-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--lec-purple-soft);
  object-fit: cover;
}

.related-program-card-body {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 18px;
}

.related-program-card-label {
  color: var(--lec-purple-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.related-program-card-title {
  margin: 0;
  font-size: 19px;
  line-height: 1.45;
}

.related-program-card-copy {
  margin: 0;
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.75;
}

.footer {
  padding: 32px 0 42px;
  background: var(--lec-black);
  color: rgba(255, 255, 255, 0.82);
}

.footer-grid {
  display: grid;
  justify-items: center;
  gap: 18px;
  text-align: center;
}

.footer-brand-image {
  width: min(320px, 72vw);
}

.footer-copy {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

@media (max-width: 899px) {
  .session-hero {
    gap: 30px;
  }

  .session-hero-copy,
  .session-thumbnail {
    flex-basis: 100%;
  }

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

  .health-panel-pillars {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .main-session-page {
    padding: 34px 0 64px;
  }

  .main-session-stack {
    gap: 20px;
  }

  .session-hero {
    gap: 26px;
    padding: 32px 22px 26px;
    border-radius: 26px;
  }

  .session-hero::before {
    inset: 10px;
    border-radius: 19px;
  }

  .session-number-row {
    gap: 12px;
    margin-bottom: 14px;
  }

  .session-label {
    font-size: 12px;
  }

  .session-title {
    font-size: clamp(30px, 10vw, 42px);
  }

  .session-meta {
    margin-top: 22px;
  }

  .session-meta-badge {
    width: 100%;
    min-height: 44px;
  }

  .session-thumbnail {
    max-width: 360px;
  }

  .session-card {
    padding: 22px 18px;
    border-radius: 22px;
  }

  .session-info-table th,
  .session-info-table td {
    padding: 12px;
  }

  .session-info-table th {
    width: 112px;
  }

  .session-speaker {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 14px;
  }

  .session-speaker-photo {
    width: 64px;
    height: 64px;
    border-radius: 15px;
  }

  body[data-main-session-id="02"] .session-speaker {
    grid-template-columns: 1fr;
  }

  body[data-main-session-id="02"] .session-speaker-photo {
    width: 96px;
    height: 96px;
    border-radius: 12px;
  }

  .session-speaker-name {
    font-size: 23px;
  }

  .other-session-link {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 12px;
    padding: 18px 16px;
  }

  .other-session-number {
    font-size: 32px;
  }

  .related-programs-grid {
    grid-template-columns: 1fr;
  }
}