@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;1,300;1,400&family=Noto+Serif+JP:wght@200;300;400;500&display=swap');

/* ── Tokens ── */
:root {
  --bg:        oklch(0.975 0.003 200);
  --bg-card:   oklch(0.985 0.002 200);
  --bg-deep:   oklch(0.925 0.006 200);
  --green:     oklch(0.46  0.09  158);
  --green-mid: oklch(0.58  0.07  175);
  --green-lt:  oklch(0.80  0.045 165);
  --ink:       oklch(0.15  0.005 200);
  --ink-mid:   oklch(0.38  0.006 200);
  --ink-lt:    oklch(0.60  0.005 200);
  --border:    oklch(0.88  0.004 200);
  --radius:    12px;
  --ff-jp:     'Noto Serif JP', serif;
  --ff-en:     'Cormorant Garamond', serif;
  --max-w:     680px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ff-jp);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.8;
  min-height: 100dvh;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── Nav ── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 56px;
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: var(--ff-en);
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--green);
  text-decoration: none;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  gap: 0;
  list-style: none;
}
.nav-links a {
  display: block;
  padding: 8px 12px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-mid);
  font-family: var(--ff-jp);
  font-weight: 300;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--green); }
.nav-links a.active { font-weight: 400; }

/* Hamburger button */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink-mid);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav drawer */
@media (max-width: 520px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 56px;
    left: 0; right: 0;
    background: color-mix(in oklch, var(--bg) 96%, transparent);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    transform: translateY(-110%);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1), opacity 0.3s;
    pointer-events: none;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    padding: 12px 24px;
    font-size: 0.88rem;
    letter-spacing: 0.06em;
  }
}

/* ── Page wrapper ── */
.page {
  padding-top: 56px;
  min-height: 100dvh;
}
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px;
}

/* ── Section heading ── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ff-en);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green-mid);
  margin-bottom: 24px;
}
.section-label::before {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--green-mid);
}
.section-title {
  font-family: var(--ff-jp);
  font-weight: 300;
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-bottom: 28px;
}

/* ── Divider ── */
.divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin: 48px 0;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 40px 22px;
  font-size: 0.72rem;
  color: var(--ink-lt);
  letter-spacing: 0.06em;
  border-top: 1px solid var(--border);
  display: none;
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Hero (index) ── */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px 28px 52px;
  display: grid;
  grid-template-columns: 1fr 180px;
  align-items: center;
  gap: 36px;
  opacity: 0;
  animation: pageIn 0.8s ease 0.1s forwards;
}
@keyframes pageIn { to { opacity: 1; } }

.hero-text-col {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.hero-name-en {
  font-family: var(--ff-en);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(0.8rem, 2.5vw, 0.95rem);
  letter-spacing: 0.22em;
  color: var(--green-mid);
  display: block;
  margin-bottom: 6px;
}
.hero-name-jp {
  font-family: var(--ff-jp);
  font-weight: 400;
  font-size: clamp(2rem, 7vw, 2.6rem);
  letter-spacing: 0.14em;
  color: var(--ink);
  display: block;
  line-height: 1.15;
  margin-bottom: 22px;
}
.hero-divider {
  width: 32px;
  height: 1px;
  background: var(--green-mid);
  margin-bottom: 18px;
}
.hero-titles {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.hero-title {
  font-size: 12px;
  color: oklch(0.12 0.003 200);
  letter-spacing: 0.04em;
  font-weight: 300;
  line-height: 1.6;
}

/* Photo blob */
.hero-photo-col {
  flex-shrink: 0;
}
.hero-photo-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 6;
}
.hero-photo-wrap::before {
  content: '';
  position: absolute;
  inset: -6px;
  background: var(--bg-deep);
  border-radius: 30% 70% 55% 45% / 55% 35% 65% 45%;
  z-index: 0;
}
.hero-photo {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 10%;
  border-radius: 28% 72% 52% 48% / 52% 32% 68% 48%;
  display: block;
}

@media (max-width: 500px) {
  .hero {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    text-align: left;
    padding: 44px 24px 40px;
    gap: 28px;
  }
  .hero-text-col { order: 2; }
  .hero-photo-col { order: 1; }
  .hero-photo-wrap {
    width: clamp(110px, 38vw, 160px);
    height: clamp(124px, 43vw, 180px);
  }
}

/* ── Bio (index) ── */
.bio-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px;
  opacity: 0;
  animation: pageIn 0.8s ease 0.5s forwards;
}
.bio-text {
  font-size: 0.92rem;
  color: var(--ink-mid);
  line-height: 2;
  font-weight: 300;
  text-align-last: left;
}
.bio-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding: 13px 28px;
  background: var(--green);
  color: #fff;
  border-radius: 40px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  font-family: var(--ff-jp);
  font-weight: 300;
  transition: background 0.2s, transform 0.2s;
}
.bio-cta:hover {
  background: oklch(0.38 0.13 148);
  transform: translateY(-1px);
}
.bio-cta-arrow {
  font-size: 0.85rem;
  transition: transform 0.2s;
}
.bio-cta:hover .bio-cta-arrow { transform: translateX(3px); }

/* ── Hobbies (index) ── */
.hobbies-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px;
}
.hobby-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.hobby-chip {
  display: inline-block;
  padding: 7px 16px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 40px;
  font-size: 0.78rem;
  color: var(--ink-mid);
  font-weight: 300;
  letter-spacing: 0.04em;
}

/* ── Contact (index) ── */
.contact-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px 80px;
}
.contact-email-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.contact-email-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: var(--bg-deep);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-email-icon svg { width: 16px; height: 16px; }
#email-display {
  font-family: monospace;
  font-size: 0.82rem;
  color: var(--green);
  letter-spacing: 0.03em;
}
.contact-note {
  font-size: 0.8rem;
  color: oklch(0.12 0.003 200);
  line-height: 1.9;
  font-weight: 300;
}
.inline-link-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}
.inline-link-card:hover {
  border-color: var(--green-mid);
  transform: translateY(-1px);
}
.inline-link-name {
  font-size: 0.88rem;
  color: var(--ink);
  font-weight: 300;
}
.inline-link-url {
  font-size: 0.72rem;
  color: var(--ink-lt);
  font-family: monospace;
  margin-left: auto;
}
.inline-link-arrow {
  color: var(--green-mid);
  font-size: 0.9rem;
  transition: transform 0.2s;
}
.inline-link-card:hover .inline-link-arrow { transform: translateX(3px); }

/* ── Page hero (career / research / links) ── */
.page-hero {
  padding: 72px 22px 48px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.page-hero-en {
  font-family: var(--ff-en);
  font-weight: 300;
  font-style: italic;
  font-size: 2.8rem;
  color: var(--green-lt);
  letter-spacing: 0.04em;
  line-height: 1;
  display: block;
}
.page-hero-jp {
  font-family: var(--ff-jp);
  font-weight: 300;
  font-size: 1.3rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  display: block;
  margin-top: 10px;
}

/* ── Timeline (career) ── */
.timeline-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px;
}
.timeline {
  position: relative;
  padding-left: 22px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 28px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green-mid);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--green-mid);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-date {
  font-family: var(--ff-en);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--green-mid);
  font-weight: 400;
  margin-bottom: 3px;
}
.timeline-body {
  font-size: 0.88rem;
  color: var(--ink);
  font-weight: 300;
  line-height: 1.7;
}
.timeline-sub {
  font-size: 0.88rem;
  color: var(--ink-mid);
}

/* ── Tag list (career) ── */
.tag-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tag-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green-mid);
  flex-shrink: 0;
  margin-top: 7px;
}
.tag-main {
  font-size: 0.88rem;
  color: var(--ink);
  font-weight: 300;
  line-height: 1.6;
}
.tag-sub {
  font-size: 0.76rem;
  color: var(--ink-lt);
}

/* ── Qual list (career) ── */
.qual-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.qual-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.84rem;
  font-weight: 300;
  color: var(--ink-mid);
}
.qual-item::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--green-lt);
  flex-shrink: 0;
}

/* ── Research ── */
.research-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px;
}
.research-theme {
  font-family: var(--ff-jp);
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.research-body p {
  font-size: 0.9rem;
  color: var(--ink-mid);
  font-weight: 300;
  line-height: 2.1;
  margin-bottom: 22px;
  text-align: justify;
  text-align-last: left;
}
.research-body p:last-child { margin-bottom: 0; }

/* Illustration */
.illust-wrap {
  margin: 36px auto 28px;
  display: flex;
  justify-content: center;
}
.illust-img {
  width: 62%;
  max-width: 240px;
  mix-blend-mode: multiply;
  border-radius: 0;
  box-shadow: none;
}

/* Pull quote */
.pull-quote {
  margin: 36px 0;
  padding: 22px 20px 22px 28px;
  border-left: 2px solid var(--green-mid);
  background: var(--bg-card);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.pull-quote p {
  font-family: var(--ff-jp);
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--ink);
  line-height: 2;
  margin: 0 !important;
}

/* Papers & presentations */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.pub-item {
  padding: 18px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.pub-meta {
  font-family: var(--ff-en);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--green-mid);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.pub-title {
  font-size: 0.86rem;
  color: var(--ink);
  font-weight: 300;
  line-height: 1.75;
}
.pub-journal {
  margin-top: 6px;
  font-size: 0.76rem;
  color: var(--ink-lt);
  font-style: italic;
}

/* Thesis */
.thesis-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.thesis-item {
  padding: 16px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.86rem;
  color: var(--ink);
  font-weight: 300;
  line-height: 1.75;
}
.thesis-label {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green-mid);
  font-family: var(--ff-en);
  margin-bottom: 5px;
}

/* ── Links ── */
.links-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 22px 80px;
}
.link-card {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  cursor: pointer;
}
.link-card:hover {
  border-color: var(--green-mid);
  box-shadow: 0 4px 20px oklch(0.44 0.12 148 / 0.1);
  transform: translateY(-2px);
}
.link-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--bg-deep);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.link-icon svg { width: 20px; height: 20px; }
.link-info { flex: 1; min-width: 0; }
.link-name {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.03em;
  margin-bottom: 3px;
}
.link-url {
  font-size: 0.72rem;
  color: var(--ink-lt);
  font-family: monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.link-arrow {
  color: var(--green-mid);
  font-size: 1rem;
  opacity: 0.6;
  transition: opacity 0.2s, transform 0.2s;
}
.link-card:hover .link-arrow {
  opacity: 1;
  transform: translateX(3px);
}