/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg:        #08080a;
  --color-bg-mid:    #101014;
  --color-bg-card:   #181820;
  --color-accent:    #d4b677;
  --color-accent-lt: #f0d99f;
  --color-text:      #f4efe8;
  --color-text-muted:#c9c1b8;
  --color-text-soft: #ddd5ca;
  --color-border:    rgba(212,182,119,0.28);
  --color-border-lt: rgba(212,182,119,0.46);

  --font-serif-en: 'Cormorant Garamond', Georgia, serif;
  --font-sans:     'Inter', sans-serif;
  --font-serif-ja: 'Noto Serif JP', serif;

  --container-max: 1100px;
  --section-pad: clamp(5rem, 10vw, 9rem);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(212,182,119,0.06), transparent 28rem),
    radial-gradient(circle at 80% 10%, rgba(244,239,232,0.045), transparent 24rem),
    var(--color-bg);
}

body > :not(.starfield):not(.site-nav) {
  position: relative;
  z-index: 1;
}

.site-nav {
  position: fixed;
  top: 1.25rem;
  right: min(4vw, 3rem);
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1rem;
  width: max-content;
  max-width: calc(100% - 2rem);
  padding: 0.35rem 0.65rem;
  background: rgba(8, 8, 10, 0.28);
  backdrop-filter: blur(8px);
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding-block: 0.2rem;
  border-bottom: 1px solid transparent;
  color: var(--color-text-soft);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: border-color 0.25s, color 0.25s;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-color: var(--color-accent-lt);
  color: var(--color-accent-lt);
}

strong {
  color: var(--color-accent-lt);
  font-weight: 600;
}

em {
  font-style: italic;
  color: var(--color-text);
}

/* ============================================================
   UTILITIES
   ============================================================ */
.container {
  width: min(var(--container-max), 92%);
  margin-inline: auto;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(90deg, rgba(8,8,10,0.92), rgba(8,8,10,0.68));
}

/* radial glow */
.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 80vw;
  height: 70vh;
  background: radial-gradient(ellipse at center, rgba(212,182,119,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(6rem, 14vw, 10rem);
}

.hero__institute {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards 0.2s;
}

.hero__title {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}

.hero__title--en {
  font-family: var(--font-sans);
  font-size: clamp(0.88rem, 1.5vw, 1rem);
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.4s;
}

.hero__title--sub {
  font-family: var(--font-serif-en);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-accent);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.5s;
}

.hero__title--main {
  font-family: var(--font-serif-en);
  font-size: clamp(3rem, 8vw, 7.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: 0;
  color: var(--color-text);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.6s;
}

.hero__title--ja {
  font-family: var(--font-serif-ja);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  font-weight: 400;
  color: var(--color-text-soft);
  letter-spacing: 0.03em;
  line-height: 2;
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.7s;
}

.hero__instructor {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.65rem;
  margin-bottom: 3.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 0.85s;
}

.hero__instructor-row {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__instructor-label {
  min-width: 6.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__instructor-name {
  font-family: var(--font-serif-en);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 400;
  color: var(--color-accent-lt);
  letter-spacing: 0.02em;
}

.hero__instructor-role {
  font-family: var(--font-serif-ja);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.hero__instructor-name--coordinator {
  font-family: var(--font-serif-ja);
  font-size: clamp(0.95rem, 1.5vw, 1.08rem);
  color: var(--color-text-soft);
}

.hero__cta {
  display: inline-block;
  padding: 1rem 2.4rem;
  border: 1px solid var(--color-border-lt);
  color: var(--color-accent);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 0.3s, color 0.3s, border-color 0.3s;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards 1s;
}

.hero__cta:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  overflow: hidden;
  opacity: 0;
  animation: fadeIn 1s ease forwards 1.4s;
}

.hero__scroll-indicator span {
  display: block;
  width: 1px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--color-accent));
  animation: scrollLine 1.8s ease-in-out infinite;
}

@keyframes scrollLine {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* ============================================================
   SECTIONS (shared)
   ============================================================ */
.section {
  padding-block: var(--section-pad);
}

.section--dark {
  background-color: rgba(8, 8, 10, 0.88);
}

.section--mid {
  background-color: rgba(16, 16, 20, 0.9);
}

.section--accent {
  background-color: rgba(14, 13, 18, 0.92);
}

.section__header {
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section__label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section__title {
  font-family: var(--font-serif-ja);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.3;
  position: relative;
  padding-bottom: 1.2rem;
}

.section__title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 1px;
  background: var(--color-accent);
  margin-top: 1.2rem;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.about__text p {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.05rem, 1.6vw, 1.18rem);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 1.4rem;
  line-height: 2;
}

.about__quote {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border-left: 1px solid var(--color-border-lt);
  position: relative;
}

.about__quote::before {
  content: '\201C';
  position: absolute;
  top: -0.5rem;
  left: 1rem;
  font-family: var(--font-serif-en);
  font-size: 5rem;
  color: var(--color-accent);
  opacity: 0.25;
  line-height: 1;
}

.about__quote blockquote {
  font-family: var(--font-serif-en);
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-style: italic;
  font-weight: 400;
  color: var(--color-accent-lt);
  line-height: 1.7;
}

.about__video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: clamp(1.75rem, 3vw, 2.5rem);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.2);
}

.about__video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ============================================================
   PURPOSE
   ============================================================ */
.purpose__content {
  max-width: 720px;
}

.purpose__lead {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.12rem, 2vw, 1.35rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 2;
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-accent);
}

.purpose__content p {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.05rem, 1.5vw, 1.14rem);
  font-weight: 400;
  color: var(--color-text-soft);
  line-height: 2;
}

/* ============================================================
   CONTENT LIST
   ============================================================ */
.content__list {
  list-style: none;
  display: grid;
  gap: 1px;
  border: 1px solid var(--color-border);
}

.content__item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.5rem;
  align-items: start;
  padding: clamp(1.2rem, 2.5vw, 1.8rem) clamp(1.2rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.25s;
}

.content__item:last-child {
  border-bottom: none;
}

.content__item:hover {
  background: rgba(200,169,110,0.04);
}

.content__num {
  font-family: var(--font-serif-en);
  font-size: 2rem;
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0.7;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.content__item p {
  font-family: var(--font-serif-ja);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.9;
  padding-top: 0.3rem;
}

/* ============================================================
   DETAILS
   ============================================================ */
.details__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.detail-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  transition: border-color 0.3s, transform 0.3s;
}

.detail-card:hover {
  border-color: var(--color-border-lt);
  transform: translateY(-4px);
}

.detail-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.detail-card__icon svg {
  width: 100%;
  height: 100%;
}

.detail-card__title {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.detail-card p {
  font-family: var(--font-serif-ja);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: 0.75rem;
}

.detail-card__note {
  font-size: 0.95rem !important;
  color: var(--color-text-soft) !important;
  line-height: 1.85 !important;
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
  margin-top: 0.5rem;
}

/* ============================================================
   WHO
   ============================================================ */
.who__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.who__tag {
  padding: 0.65rem 1.35rem;
  border: 1px solid var(--color-border-lt);
  font-family: var(--font-serif-ja);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-accent-lt);
  letter-spacing: 0.04em;
  transition: background 0.25s, color 0.25s;
  cursor: default;
}

.who__tag:hover {
  background: rgba(200,169,110,0.12);
}

.who__desc {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.05rem, 1.5vw, 1.15rem);
  font-weight: 400;
  color: var(--color-text-soft);
  line-height: 2;
}

/* ============================================================
   BOOKS
   ============================================================ */
.books__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 2.4vw, 1.75rem);
  align-items: stretch;
}

.book-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(18rem, 30vw, 25rem);
  padding: clamp(0.85rem, 1.8vw, 1.25rem);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.2);
  transition: border-color 0.3s, transform 0.3s;
}

.book-card:hover {
  border-color: var(--color-border-lt);
  transform: translateY(-4px);
}

.book-card img {
  display: block;
  width: 100%;
  max-height: clamp(16rem, 27vw, 23rem);
  object-fit: contain;
  box-shadow: 0 16px 28px rgba(0, 0, 0, 0.32);
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact__content {
  max-width: 700px;
}

.contact__lead {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.05rem, 1.6vw, 1.15rem);
  font-weight: 400;
  color: var(--color-text-soft);
  line-height: 2;
  margin-bottom: 3rem;
}

.contact__form-wrap {
  position: relative;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form__label {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.form__required {
  color: var(--color-accent);
}

.form__input,
.form__textarea {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-serif-ja);
  font-size: 1.05rem;
  font-weight: 400;
  padding: 1rem 1.1rem;
  outline: none;
  transition: border-color 0.25s;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.78;
}

.form__input:focus,
.form__textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212,182,119,0.18);
}

.form__textarea {
  resize: vertical;
  min-height: 110px;
}

.form__submit {
  display: inline-block;
  align-self: flex-start;
  padding: 1rem 2.5rem;
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.3s, color 0.3s;
}

.form__submit:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Success message */
.form__success {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 3rem;
  border: 1px solid var(--color-border-lt);
  text-align: center;
}

.form__success svg {
  width: 3rem;
  height: 3rem;
  color: var(--color-accent);
}

.form__success p {
  font-family: var(--font-serif-ja);
  font-size: 1.08rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 2;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding-block: 2.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer__program {
  font-family: var(--font-serif-en);
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0.25rem;
}

.footer__instructor {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.footer__institute {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
  text-align: right;
}

.footer__copy {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  opacity: 0.8;
  text-align: right;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

/* scroll reveal — initial state */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* stagger delay helpers */
.reveal--d1 { transition-delay: 0.1s; }
.reveal--d2 { transition-delay: 0.2s; }
.reveal--d3 { transition-delay: 0.3s; }
.reveal--d4 { transition-delay: 0.4s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr;
  }

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

  .content__item {
    grid-template-columns: 3rem 1fr;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer__institute,
  .footer__copy {
    text-align: left;
  }
}

@media (max-width: 500px) {
  .site-nav {
    top: 0.75rem;
    left: 0.75rem;
    right: auto;
    width: calc(100% - 1.5rem);
    justify-content: center;
    gap: 0.75rem;
  }

  .site-nav a {
    justify-content: center;
  }

  .container {
    width: min(var(--container-max), 88%);
  }

  .hero__inner {
    padding-block: 5rem;
  }

  .hero__title--main {
    font-size: clamp(2.65rem, 11vw, 4rem);
  }

  .hero__instructor {
    gap: 0.25rem;
  }

  .hero__instructor-row {
    flex-direction: column;
    gap: 0.15rem;
  }

  .hero__instructor-label {
    min-width: 0;
  }

  .content__item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

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

  .book-card {
    min-height: auto;
  }

  .book-card img {
    max-height: 24rem;
  }

  .content__num {
    font-size: 1.4rem;
  }
}