:root {
  --black: #171412;
  --black2: #201a17;
  --paper: #efefec;
  --white: #fbfaf6;
  --muted: rgba(251, 250, 246, 0.68);
  --gold: #d7922c;
  --red: #a91534;
  --blue: #006fa6;
  --green: #47752d;
  --purple: #7e2b58;
  --line: rgba(251, 250, 246, 0.16);
  --dark-line: rgba(23, 20, 18, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--white);
  background: var(--black);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.9;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(23, 20, 18, 0.96), rgba(23, 20, 18, 0.82)),
    url("ChatGPT Image 2026年6月5日 15_51_25.png") center/cover;
  filter: blur(18px) saturate(0.85);
  transform: scale(1.05);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 12% 10%, rgba(215, 146, 44, 0.18), transparent 32%),
    radial-gradient(circle at 90% 34%, rgba(0, 111, 166, 0.14), transparent 28%),
    rgba(23, 20, 18, 0.72);
  pointer-events: none;
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2 {
  font-family: "Zen Old Mincho", serif;
  font-weight: 900;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(43px, 6.4vw, 86px);
  line-height: 1.18;
}

h2 {
  font-size: clamp(31px, 4.6vw, 62px);
  line-height: 1.2;
}

h3 {
  font-size: clamp(20px, 2.4vw, 30px);
  line-height: 1.45;
}

.keep-line {
  display: inline-block;
  white-space: nowrap;
}

.eyebrow {
  color: var(--gold);
  font-family: "Cormorant Garamond", serif;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
}

.hero {
  min-height: 100svh;
  padding: 18px max(18px, calc((100% - 1180px) / 2)) 82px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 54px;
  position: relative;
  z-index: 3;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  line-height: 1.2;
}

.logo small {
  color: rgba(251, 250, 246, 0.62);
  font-size: 10px;
  font-weight: 500;
}

.logo-mark {
  font-size: 29px;
  line-height: 1;
}

.logo-image {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(251, 250, 246, 0.2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.nav-button,
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 900;
}

.nav-button,
.pill-primary {
  color: #171412;
  background: var(--gold);
}

.pill-dark {
  border: 1px solid rgba(251, 250, 246, 0.42);
  color: var(--white);
  background: rgba(23, 20, 18, 0.35);
}

.hero-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 52px;
  align-items: center;
  min-height: calc(100svh - 80px);
  padding-top: 42px;
}

.hero-copy {
  max-width: 610px;
  min-width: 0;
}

.hero-copy .eyebrow {
  margin-bottom: 18px;
}

.hero-lead {
  margin-top: 24px;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 18px);
  font-weight: 500;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 34px;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(24px, 3vw, 36px);
  color: var(--white);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.photo-mosaic {
  display: grid;
  grid-template-columns: repeat(4, minmax(90px, 1fr));
  grid-auto-rows: minmax(140px, 20vh);
  gap: 8px;
  min-height: 470px;
  min-width: 0;
}

.tile {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid rgba(251, 250, 246, 0.18);
}

.tile img {
  filter: saturate(0.88) contrast(1.03);
}

.tile::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(169, 21, 52, 0.22);
  pointer-events: none;
}

.tile:nth-child(1) {
  border-color: var(--red);
}

.tile:nth-child(1)::after {
  background: rgba(169, 21, 52, 0.28);
}

.tile:nth-child(2) {
  border-color: var(--gold);
}

.tile:nth-child(2)::after {
  background: rgba(215, 146, 44, 0.28);
}

.tile:nth-child(3) {
  border-color: var(--blue);
}

.tile:nth-child(3)::after {
  background: rgba(0, 111, 166, 0.28);
}

.tile:nth-child(4) {
  border-color: var(--purple);
}

.tile:nth-child(4)::after {
  background: rgba(126, 43, 88, 0.28);
}

.tile:nth-child(5) {
  border-color: var(--green);
}

.tile:nth-child(5)::after {
  background: rgba(71, 117, 45, 0.28);
}

.tile:nth-child(6)::after {
  background: rgba(215, 146, 44, 0.24);
}

.tile.tall {
  grid-row: span 2;
}

.section-dark,
.section-light {
  padding: 96px max(22px, calc((100% - 1120px) / 2));
}

.section-dark {
  background: rgba(23, 20, 18, 0.92);
}

.concept {
  display: grid;
  grid-template-columns: 1fr 0.72fr 0.9fr;
  gap: 42px;
  align-items: center;
}

.concept-heading h2 {
  margin-top: 10px;
  font-family: "Cormorant Garamond", "Zen Old Mincho", serif;
  font-size: clamp(48px, 7vw, 86px);
  font-weight: 600;
}

.concept-body {
  color: var(--muted);
  writing-mode: vertical-rl;
  max-height: 380px;
  font-size: 15px;
}

.concept-body p + p {
  margin-right: 22px;
}

.concept-photo {
  height: 430px;
  margin: 0;
  border: 1px solid var(--line);
}

.gallery-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  padding-top: 26px;
  padding-bottom: 84px;
}

.gallery-strip img {
  aspect-ratio: 1.12;
  border: 1px solid var(--line);
}

.gallery-strip img[aria-hidden="true"] {
  display: none;
}

.gallery-strip img:nth-child(1) {
  border-bottom: 4px solid var(--purple);
}

.gallery-strip img:nth-child(2) {
  border-bottom: 4px solid var(--green);
}

.gallery-strip img:nth-child(3) {
  border-bottom: 4px solid var(--red);
}

.gallery-strip img:nth-child(4) {
  border-bottom: 4px solid var(--gold);
}

.gallery-strip img:nth-child(5) {
  border-bottom: 4px solid var(--blue);
}

.section-title {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-title.centered {
  margin-inline: auto;
  text-align: center;
}

.section-title h2 {
  margin-top: 9px;
}

.overview {
  position: relative;
  overflow: hidden;
}

.overview-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.2fr;
  gap: 50px;
  align-items: center;
}

.side-label {
  margin-bottom: 24px;
  color: var(--muted);
  font-family: "Cormorant Garamond", serif;
  font-size: 18px;
}

.overview-copy p:not(.side-label) {
  margin-top: 18px;
  color: var(--muted);
}

.video-card {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  overflow: hidden;
}

.video-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.26);
}

.play {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(30px, 5vw, 54px);
}

.ghost-title {
  margin-top: 72px;
  margin-left: calc((100vw - 1120px) / -2);
  color: rgba(215, 146, 44, 0.2);
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(44px, 8vw, 98px);
  white-space: nowrap;
}

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

.target-grid article {
  padding: 26px;
  border: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.05);
}

.target-grid span {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--blue);
  font-size: 12px;
  font-weight: 900;
}

.target-grid ul {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
}

.target-grid li {
  position: relative;
  padding-left: 24px;
  margin-top: 12px;
}

.target-grid li::before {
  content: "□";
  position: absolute;
  left: 0;
  color: var(--gold);
}

.schedule-layout {
  display: grid;
  grid-template-columns: 160px minmax(0, 720px);
  gap: 68px;
  justify-content: center;
  align-items: start;
}

.day-switch {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 13px;
  padding-top: 128px;
}

.day-switch a {
  min-height: 38px;
  padding: 6px 16px;
  border: 1px solid rgba(251, 250, 246, 0.55);
  border-radius: 999px;
  color: var(--white);
  font-family: "Cormorant Garamond", serif;
  font-weight: 700;
}

.day-switch a:nth-child(2) {
  background: var(--white);
  color: var(--black);
}

.day {
  margin-top: 54px;
}

.day h3 {
  margin-bottom: 22px;
  color: var(--gold);
  font-family: "Cormorant Garamond", "Zen Old Mincho", serif;
  font-size: clamp(38px, 5vw, 68px);
  font-weight: 500;
}

.day h3 span {
  margin-right: 16px;
}

.day-theme {
  margin: -4px 0 24px;
  padding-left: 18px;
  border-left: 3px solid var(--gold);
}

.day-theme strong,
.day-theme span {
  display: block;
}

.day-theme strong {
  font-size: 22px;
  line-height: 1.55;
}

.day-theme span {
  margin-top: 8px;
  color: rgba(251, 250, 246, 0.72);
  font-size: 14px;
  line-height: 1.75;
}

.session {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px 20px;
  padding: 18px 22px;
  color: var(--white);
  border: 1px solid rgba(0, 0, 0, 0.3);
}

.session + .session {
  margin-top: 4px;
}

.session time {
  grid-row: span 2;
  font-family: "Cormorant Garamond", serif;
  font-size: 18px;
}

.session strong {
  font-size: 20px;
  line-height: 1.35;
}

.session p {
  color: rgba(251, 250, 246, 0.84);
  font-size: 14px;
}

details.session-expand {
  display: block;
  padding: 0;
  color: var(--white);
}

details.session-expand.gold {
  background: var(--gold);
}

details.session-expand.red {
  background: var(--red);
}

details.session-expand.blue {
  background: var(--blue);
}

details.session-expand.green {
  background: var(--green);
}

.session-expand summary {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 24px;
  gap: 20px;
  align-items: start;
  padding: 18px 22px;
  color: var(--white);
  border: 0;
  font-weight: 400;
}

.session-expand summary::after {
  float: none;
  align-self: center;
  font-family: Arial, sans-serif;
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  text-align: center;
}

.session-expand time {
  grid-row: auto;
}

.session-copy,
.session-copy strong,
.session-copy > span {
  display: block;
}

.session-copy > span {
  margin-top: 8px;
  color: rgba(251, 250, 246, 0.84);
  font-size: 14px;
  line-height: 1.65;
}

.session-detail {
  display: grid;
  gap: 14px;
  margin: 0 22px 20px 114px;
  padding: 18px 20px;
  background: rgba(23, 20, 18, 0.18);
  border-top: 1px solid rgba(251, 250, 246, 0.24);
}

.session-detail strong {
  font-size: 13px;
  letter-spacing: 0;
}

.session-detail p {
  margin-top: 4px;
  padding: 0;
  color: rgba(251, 250, 246, 0.9);
  font-size: 13px;
  line-height: 1.75;
}

.session-detail ul {
  display: grid;
  gap: 7px;
  margin-top: 7px;
  padding-left: 1.2em;
  color: rgba(251, 250, 246, 0.9);
  font-size: 13px;
  line-height: 1.7;
}

.gold {
  background: var(--gold);
}

.red {
  background: var(--red);
}

.blue {
  background: var(--blue);
}

.green {
  background: var(--green);
}

.section-light {
  color: var(--black);
  background: var(--paper);
  border-top: 8px solid;
  border-image: linear-gradient(90deg, var(--purple), var(--green), var(--red), var(--gold), var(--blue)) 1;
}

.section-light .eyebrow {
  color: rgba(23, 20, 18, 0.45);
}

.backbone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 44px;
  color: rgba(23, 20, 18, 0.72);
}

.thinking-row {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 42px;
  overflow: hidden;
}

.thinking-row::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -86px 0 -22px;
  background: url("p4c-philosopher.png") center 14% / 430px auto no-repeat;
  opacity: 0.3;
  pointer-events: none;
}

.thinking-row div {
  position: relative;
  padding: 30px;
  border: 1px solid var(--dark-line);
  background: rgba(251, 250, 246, 0.78);
}

.thinking-row span {
  color: var(--gold);
  font-family: "Cormorant Garamond", serif;
  font-size: 19px;
  font-weight: 700;
}

.thinking-row strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.faq-list {
  display: grid;
  gap: 22px;
  max-width: 920px;
  margin-inline: auto;
}

details {
  background: rgba(251, 250, 246, 0.92);
  color: var(--black);
}

summary {
  cursor: pointer;
  list-style: none;
  padding: 22px 28px;
  font-weight: 900;
  border-bottom: 1px solid var(--dark-line);
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  font-size: 20px;
}

details[open] summary::after {
  content: "-";
}

details p {
  padding: 20px 28px 24px;
  color: rgba(23, 20, 18, 0.72);
}

.offer {
  display: grid;
  grid-template-columns: 0.74fr 1fr;
  gap: 48px;
  align-items: center;
}

.cta-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.cta-gallery img {
  aspect-ratio: 1;
  border: 1px solid var(--line);
}

.offer-copy p:not(.eyebrow) {
  margin-top: 20px;
  color: var(--muted);
  font-size: 17px;
}

.offer-copy .pill {
  margin-top: 28px;
}

.info-card {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 36px;
  padding: 32px;
  color: var(--black);
  background: rgba(251, 250, 246, 0.92);
}

.info-card h3 {
  font-family: "Zen Old Mincho", serif;
  font-size: 34px;
}

.info-card dl {
  margin: 0;
}

.info-card div {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 18px;
  padding: 12px 0;
  border-top: 1px solid var(--dark-line);
}

.info-card dt {
  font-weight: 900;
}

.info-card dd {
  margin: 0;
  font-weight: 700;
}

.footer {
  min-height: 360px;
  display: flex;
  align-items: end;
  padding: 46px max(22px, calc((100% - 1120px) / 2));
  background:
    linear-gradient(rgba(23, 20, 18, 0.28), rgba(23, 20, 18, 0.82)),
    url("ChatGPT Image 2026年6月5日 15_58_58 (3).png") center/cover;
}

.footer-copy {
  margin-top: 22px;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(42px, 8vw, 96px);
  line-height: 0.9;
}

.full-house-button {
  position: relative;
}

.full-house-stamp {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  width: 96px;
  max-width: none;
  height: auto;
  transform: translate(-50%, -50%) rotate(-12deg);
  pointer-events: none;
  user-select: none;
}

.nav-button .full-house-stamp {
  width: 64px;
}

.floating-apply {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 20;
  display: grid;
  place-items: center;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  color: var(--black);
  background: var(--gold);
  font-weight: 900;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .hero-inner,
  .concept,
  .overview-grid,
  .schedule-layout,
  .backbone-grid,
  .offer,
  .info-card {
    grid-template-columns: 1fr;
  }

  .photo-mosaic {
    grid-auto-rows: 170px;
  }

  .concept-body {
    writing-mode: horizontal-tb;
    max-height: none;
  }

  .concept-body p + p {
    margin: 18px 0 0;
  }

  .day-switch {
    position: static;
    grid-template-columns: repeat(3, 1fr);
    padding-top: 0;
  }

  .target-grid,
  .thinking-row {
    grid-template-columns: 1fr;
  }

  .thinking-row::before {
    inset: -24px 0;
    background-position: center;
    background-size: min(78vw, 360px) auto;
    opacity: 0.26;
  }
}

@media (max-width: 640px) {
  .hero {
    min-height: 100svh;
    padding: 12px 12px 44px;
  }

  .logo {
    font-size: 13px;
  }

  .logo-mark {
    font-size: 22px;
  }

  .logo-image {
    width: 28px;
    height: 28px;
    border-radius: 7px;
  }

  .nav-button {
    min-height: 38px;
    padding-inline: 14px;
    font-size: 12px;
  }

  .hero-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
    min-height: calc(100svh - 62px);
    padding-top: 14px;
  }

  .photo-mosaic {
    order: -1;
  }

  h1 {
    font-size: clamp(28px, 8vw, 36px);
    line-height: 1.16;
  }

  h2 {
    font-size: clamp(29px, 8.3vw, 36px);
  }

  .hero-copy {
    max-width: none;
  }

  .hero-copy .eyebrow {
    margin-bottom: 10px;
    font-size: 14px;
  }

  .hero-lead {
    margin-top: 16px;
    font-size: 12px;
    line-height: 1.75;
  }

  .hero-meta {
    margin-top: 18px;
    gap: 4px 10px;
    font-size: 19px;
  }

  .hero-actions {
    display: grid;
    gap: 9px;
    margin-top: 14px;
  }

  .pill {
    width: 100%;
    min-height: 40px;
    padding: 9px 13px;
    font-size: 12px;
  }

  .photo-mosaic {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-auto-rows: minmax(92px, 15svh);
    gap: 5px;
    min-height: auto;
  }

  .photo-mosaic .tile:nth-child(1)::after {
    background: rgba(169, 21, 52, 0.42);
  }

  .photo-mosaic .tile:nth-child(2)::after {
    background: rgba(215, 146, 44, 0.4);
  }

  .photo-mosaic .tile:nth-child(3)::after {
    background: rgba(0, 111, 166, 0.38);
  }

  .photo-mosaic .tile:nth-child(4)::after {
    background: rgba(169, 21, 52, 0.34);
  }

  .photo-mosaic .tile:nth-child(5)::after {
    background: rgba(0, 111, 166, 0.34);
  }

  .photo-mosaic .tile:nth-child(6)::after {
    background: rgba(215, 146, 44, 0.38);
  }

  .tile.tall {
    grid-row: span 1;
  }

  .section-dark,
  .section-light {
    padding: 64px 18px;
  }

  .concept {
    gap: 24px;
  }

  .concept-heading h2 {
    font-size: clamp(45px, 14vw, 58px);
  }

  .concept-body {
    font-size: 13px;
    line-height: 2;
  }

  .concept-photo {
    height: 280px;
  }

  .gallery-strip {
    display: flex;
    gap: 9px;
    overflow-x: auto;
    padding-left: 18px;
    padding-right: 18px;
    margin-left: -18px;
    margin-right: -18px;
    scroll-snap-type: none;
    scrollbar-width: none;
    -ms-overflow-style: none;
    touch-action: pan-x pan-y;
  }

  .gallery-strip::-webkit-scrollbar {
    display: none;
  }

  .gallery-strip img {
    display: block;
    flex: 0 0 82%;
    max-width: 320px;
  }

  .ghost-title {
    margin-left: 0;
    white-space: normal;
    font-size: 40px;
    line-height: 1.05;
  }

  .target-grid article,
  .thinking-row div,
  .info-card {
    padding: 22px;
  }

  .schedule-layout {
    gap: 30px;
  }

  .day-switch {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    overflow: visible;
    margin-inline: 0;
    padding: 0;
  }

  .day-switch a {
    min-width: 0;
    padding-inline: 8px;
    font-size: clamp(15px, 4.8vw, 18px);
    text-align: center;
  }

  .day {
    margin-top: 34px;
  }

  .day h3 {
    font-size: 34px;
    line-height: 1.15;
  }

  .day h3 span {
    display: block;
    margin: 0 0 2px;
  }

  .day-theme {
    margin-bottom: 20px;
    padding-left: 14px;
  }

  .day-theme strong {
    font-size: 17px;
  }

  .day-theme span {
    font-size: 12px;
  }

  .session {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 5px 12px;
    padding: 16px;
  }

  .session time {
    grid-row: span 2;
    font-size: 15px;
  }

  .session strong {
    font-size: 16px;
  }

  .session p {
    font-size: 12px;
    line-height: 1.65;
  }

  .session-expand summary {
    grid-template-columns: 44px minmax(0, 1fr) 18px;
    gap: 10px;
    padding: 16px 14px;
  }

  .session-copy > span {
    font-size: 12px;
  }

  .session-detail {
    margin: 0 14px 16px 68px;
    padding: 14px;
  }

  .session-detail p,
  .session-detail ul {
    font-size: 12px;
  }

  .backbone-grid {
    gap: 18px;
    font-size: 13px;
  }

  details p,
  summary {
    padding-left: 18px;
    padding-right: 18px;
    font-size: 13px;
  }

  .offer {
    gap: 34px;
  }

  .cta-gallery {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 5px;
  }

  .info-card div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .footer {
    min-height: 260px;
  }

  .floating-apply {
    right: 14px;
    bottom: 14px;
    width: 64px;
    height: 64px;
    font-size: 14px;
  }

  .floating-apply .full-house-stamp {
    width: 80px;
  }
}