:root {
  --bg: #f4f0e8;
  --bg-deep: #e7dfd2;
  --surface: rgba(255, 255, 255, 0.58);
  --surface-strong: rgba(255, 255, 255, 0.75);
  --line: rgba(49, 41, 31, 0.12);
  --text: #1e1a16;
  --muted: rgba(30, 26, 22, 0.68);
  --accent: #8d6b3f;
  --accent-soft: rgba(141, 107, 63, 0.14);
  --shadow: 0 24px 80px rgba(45, 35, 22, 0.12);
  --max: 1200px;
  --radius: 28px;
  --font-display: "Bodoni Moda", "Noto Serif JP", serif;
  --font-body: "Inter", "Noto Serif JP", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(214, 196, 165, 0.42), transparent 30%),
    linear-gradient(180deg, #f7f2e9 0%, #f0e9de 100%);
  overflow-x: hidden;
}

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

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

.site-shell {
  position: relative;
  isolation: isolate;
}

.ambient {
  position: fixed;
  inset: auto;
  width: 42rem;
  height: 42rem;
  border-radius: 999px;
  filter: blur(80px);
  opacity: 0.45;
  pointer-events: none;
  z-index: -1;
  transform: translate3d(0, 0, 0);
}

.ambient-a {
  top: -10rem;
  right: -12rem;
  background: rgba(175, 143, 102, 0.2);
}

.ambient-b {
  bottom: -10rem;
  left: -12rem;
  background: rgba(120, 96, 70, 0.16);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: min(calc(100% - 2rem), var(--max));
  margin: 1rem auto 0;
  padding: 0.9rem 1.1rem;
  background: rgba(247, 242, 233, 0.68);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(72, 57, 41, 0.08);
  border-radius: 999px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem;
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.lang-switch a {
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.85rem;
}

.lang-switch a.is-current {
  color: #fbf8f3;
  background: #201912;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a {
  font-family: var(--font-display);
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 5rem 0;
}

.hero {
  min-height: calc(100vh - 5rem);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.lang-en .eyebrow {
  font-size: 1.04rem;
  letter-spacing: 0.18em;
}

.lang-ja .eyebrow {
  font-size: 1.04rem;
  letter-spacing: 0.18em;
}

.hero h1,
.section-heading h2,
.story-block h2,
.story-block h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(3.9rem, 9.8vw, 8rem);
}

.hero h1 span {
  display: block;
  color: rgba(30, 26, 22, 0.78);
}

.hero-name {
  line-height: 0.94;
}

.hero-name-ja {
  display: block;
  font-family: "Noto Serif JP", serif;
  font-size: clamp(3.6rem, 8vw, 6.4rem);
  letter-spacing: 0.02em;
}

.hero-lead,
.section-copy,
.story-block p,
.panel p,
.price-card p,
.contact-panel p,
.faq-item p,
.timeline-item p {
  color: var(--muted);
  line-height: 1.8;
}

.hero-lead {
  max-width: 40rem;
  margin: 1.5rem 0;
  font-size: 1.1rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-meta span,
.research-status,
.social-links a {
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(16px);
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 10rem;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  transition: transform 220ms ease, background 220ms ease, color 220ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #fbf8f3;
  background: #201912;
  box-shadow: var(--shadow);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.42);
  border: 1px solid var(--line);
}

.hero-visual {
  position: relative;
  min-height: 32rem;
}

.portrait-frame {
  width: min(28rem, 100%);
  aspect-ratio: 3 / 4;
  margin-left: auto;
  border-radius: 2rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-card {
  position: absolute;
  left: 0;
  bottom: 2rem;
  max-width: 18rem;
  padding: 1.2rem 1.3rem;
  background: var(--surface-strong);
  border: 1px solid rgba(55, 44, 31, 0.1);
  border-radius: 1.5rem;
  box-shadow: var(--shadow);
}

.hero-card p {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.metric,
.panel,
.price-card,
.contact-panel,
.faq-item,
.timeline-item,
.papers-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 40px rgba(48, 38, 27, 0.05);
}

.metric {
  padding: 1.5rem;
}

.metric-value {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-display);
  font-size: 2.6rem;
}

.metric-label {
  color: var(--muted);
}

.story {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 2rem;
  align-items: start;
}

.story-media {
  position: sticky;
  top: 6.5rem;
  min-height: 75vh;
  border-radius: 2rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.story-cover {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(16, 10, 6, 0.18), rgba(16, 10, 6, 0.48)),
    url("https://researchmap.jp/fujimurakeiji/cover_picture.jpeg") center/cover;
  transform: scale(1.08);
}

.story-overlay {
  position: absolute;
  inset: auto 0 0;
  padding: 1.8rem;
  color: #f8f4ee;
}

.story-overlay p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.story-content {
  display: grid;
  gap: 1.25rem;
}

.story-block,
.panel,
.price-card,
.contact-panel,
.timeline-item,
.faq-item,
.papers-grid article {
  padding: 1.6rem;
}

.section-heading {
  max-width: 42rem;
  margin-bottom: 2rem;
}

.section-heading h2 {
  font-size: clamp(2.6rem, 6vw, 4.8rem);
  line-height: 0.98;
}

.achievements .section-heading {
  max-width: 52rem;
}

.achievements .section-heading h2 {
  font-size: clamp(2.4rem, 5.2vw, 4.4rem);
}

.grid.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.grid.two {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.panel h3,
.price-card h3,
.papers-grid h3,
.research-group h3,
.output-card h3 {
  margin-top: 0;
  margin-bottom: 0.8rem;
}

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-year,
.paper-meta,
.paper-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.papers-grid p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.research-groups {
  display: grid;
  gap: 1rem;
}

.research-group {
  padding: 1.6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 40px rgba(48, 38, 27, 0.05);
}

.research-group > h3 {
  margin-bottom: 1rem;
}

.outputs-list {
  display: grid;
  gap: 1rem;
}

.output-card {
  padding: 1.2rem 1.25rem;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
  border-radius: 1.4rem;
}

.output-card h3 {
  font-size: 1.1rem;
  line-height: 1.35;
}

.output-card p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.output-loading {
  margin: 0;
  color: var(--muted);
}

.social-layout {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 1rem;
  align-items: start;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.social-feature {
  min-height: 100%;
  padding: 2rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(244, 236, 224, 0.7)),
    radial-gradient(circle at top right, rgba(141, 107, 63, 0.08), transparent 40%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(48, 38, 27, 0.05);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
}

.social-feature-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.social-feature h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1;
}

.social-feature p:last-of-type {
  margin: 0;
  max-width: 24rem;
  color: var(--muted);
  line-height: 1.8;
}

.social-feature-actions {
  display: flex;
  gap: 0.85rem;
}

.price-card.featured {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(243, 234, 219, 0.76));
  transform: translateY(-0.3rem);
}

.price {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--text);
}

.source-note {
  margin-top: 0.8rem;
  color: var(--accent);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}

.auto-list {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  line-height: 1.75;
}

.auto-list li::marker {
  color: var(--accent);
}

.faq-list {
  display: grid;
  gap: 1rem;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item[open] {
  background: var(--surface-strong);
}

.contact-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.contact-panel-stacked {
  display: block;
}

.contact-form {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.contact-form label {
  display: grid;
  gap: 0.5rem;
}

.contact-form span {
  font-size: 0.92rem;
  color: var(--muted);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.95rem 1rem;
  font: inherit;
  color: var(--text);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--line);
  border-radius: 1rem;
  outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(141, 107, 63, 0.45);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 0 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.floating {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@media (max-width: 1100px) {
  .hero,
  .story,
  .social-layout,
  .grid.three,
  .grid.two,
  .metrics,
  .papers-grid {
    grid-template-columns: 1fr;
  }

  .story-media {
    position: relative;
    top: auto;
    min-height: 25rem;
  }

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

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

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    border-radius: 1.3rem;
    flex-direction: column;
  }

  .nav {
    gap: 0.75rem 1rem;
    font-size: 0.9rem;
  }

  .section {
    padding: 4rem 0;
  }

  .hero {
    min-height: auto;
    padding-top: 2rem;
  }

  .hero-visual {
    min-height: 24rem;
  }

  .portrait-frame {
    width: 100%;
  }

  .hero-card {
    position: relative;
    left: auto;
    bottom: auto;
    margin-top: 1rem;
    max-width: none;
  }

  .section-heading h2 {
    font-size: clamp(2.4rem, 12vw, 3.5rem);
  }
}