/* ============================================================
   Fujishiro Lab — style.css
   Design: Refined academic · Deep navy + warm gold accent
   ============================================================ */

/* --- Custom Properties --- */
:root {
  --navy:       #12213e;
  --navy-mid:   #1c3157;
  --navy-light: #243c6a;
  --gold:       #c09a5a;
  --gold-light: #d4b483;
  --cream:      #f7f4ee;
  --text:       #1a1a1a;
  --text-light: #5a5a5a;
  --border:     #d6d0c4;
  --white:      #ffffff;
  --font-serif: 'EB Garamond', Georgia, serif;
  --font-sans:  'Noto Sans JP', sans-serif;
  --font-mono:  'Space Mono', monospace;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --max-w:      1100px;
  --radius:     6px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--navy-mid); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* --- Header / Nav --- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(18, 33, 62, 0.97);
  box-shadow: 0 2px 24px rgba(0,0,0,0.25);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.lab-name {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  text-decoration: none;
}
.lab-name-en {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.03em;
}
.lab-name-ja {
  font-size: 0.65rem;
  color: var(--gold-light);
  letter-spacing: 0.1em;
}
.main-nav {
  margin-left: auto;
  display: flex;
  gap: 2.4rem;
}
.main-nav a {
  color: rgba(255,255,255,0.82);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.main-nav a:hover {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  background: rgba(18, 33, 62, 0.98);
  padding: 1rem 2rem 2rem;
  gap: 1.2rem;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Hero --- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-img-wrap {
  position: absolute;
  inset: 0;
}
.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(12, 24, 52, 0.72) 0%,
    rgba(18, 33, 62, 0.55) 50%,
    rgba(8, 16, 36, 0.80) 100%
  );
}
.hero-text {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 2rem;
}
.hero-affil {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--gold-light);
  font-family: var(--font-mono);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeUp 0.9s 0.3s ease forwards;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.04em;
  line-height: 1.05;
  opacity: 0;
  animation: fadeUp 0.9s 0.55s ease forwards;
}
.hero-sub {
  margin-top: 1rem;
  font-size: clamp(0.85rem, 2vw, 1.05rem);
  color: rgba(255,255,255,0.72);
  letter-spacing: 0.06em;
  font-style: italic;
  font-family: var(--font-serif);
  opacity: 0;
  animation: fadeUp 0.9s 0.8s ease forwards;
}
.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.45);
  font-size: 1.3rem;
  animation: bounce 2s infinite;
  z-index: 2;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* --- Container & Sections --- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}
.section {
  padding: 6rem 0;
}
.section-title {
  font-family: var(--font-serif);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 3.5rem;
  position: relative;
  padding-bottom: 1rem;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 48px; height: 1px;
  background: var(--gold);
}
.section-title .en { /* already uppercase via .section-title */ }

/* --- NEWS --- */
.news-section {
  background: var(--white);
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.news-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.5rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  line-height: 1.75;
}
.news-item:first-child { border-top: 1px solid var(--border); }
.news-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.05em;
  padding-top: 0.12rem;
  white-space: nowrap;
}
.news-body { color: var(--text-light); }
.news-body em { font-style: italic; color: var(--text); }
.news-body strong { font-weight: 600; color: var(--text); }
.news-pubs {
  list-style: disc;
  margin-top: 0.6rem;
  padding-left: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.88rem;
}

/* --- MEMBERS --- */
.members-section {
  background: var(--cream);
}
.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
}
.member-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.member-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(18,33,62,0.12);
}
.pi-card {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  border-left: 4px solid var(--gold);
}
.member-photo-wrap {
  flex-shrink: 0;
}
.member-photo-placeholder {
  width: 140px;
  height: 140px;
  background: var(--navy);
  color: var(--gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
}
.pi-card .member-photo-placeholder { width: 180px; height: 180px; font-size: 2.5rem; }
.member-photo-placeholder.empty {
  background: #eceae6;
  color: #bbb;
  font-size: 1.5rem;
}
.empty-card .member-photo-placeholder { width: 100%; height: 140px; }
.member-info {
  padding: 1.4rem 1.6rem;
  flex: 1;
}
.member-role {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.5rem;
}
.member-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}
.member-name-ja {
  display: block;
  font-size: 0.95rem;
  color: var(--text-light);
  font-weight: 400;
}
.member-affil {
  font-size: 0.8rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 0.8rem;
}
.member-links {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.member-links a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy-mid);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: color var(--transition), border-color var(--transition);
}
.member-links a:hover { color: var(--gold); border-color: var(--gold); }
.member-email {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-light);
  letter-spacing: 0.03em;
}
.empty-name {
  font-size: 1rem;
  color: #bbb;
  font-style: italic;
}

/* --- PUBLICATIONS --- */
.pub-section {
  background: var(--white);
}
.pub-note {
  font-size: 0.82rem;
  color: var(--text-light);
  font-style: italic;
  margin-top: -2rem;
  margin-bottom: 3rem;
  font-family: var(--font-serif);
}
.pub-year-block {
  margin-bottom: 3rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}
.pub-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.pub-list li {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-light);
  padding-left: 1rem;
  position: relative;
}
.pub-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.7em;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--gold);
}
.pub-list li strong { color: var(--navy); font-weight: 600; }
.pub-list li em { font-style: italic; color: var(--text); }
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--navy);
  color: var(--gold-light);
  padding: 2px 8px;
  border-radius: 2px;
  vertical-align: middle;
  margin-left: 0.4rem;
}

/* --- CV --- */
.cv-section {
  background: var(--cream);
}
.cv-table {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.cv-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.7;
}
.cv-row:first-child { border-top: 1px solid var(--border); }
.cv-period {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.04em;
  padding-top: 0.15rem;
}
.cv-desc { color: var(--text-light); }
.cv-desc strong { color: var(--text); font-weight: 600; }

/* --- CONTACT --- */
.contact-section {
  background: var(--navy);
}
.contact-section .section-title .en { color: var(--gold); }
.contact-section .section-title::after { background: var(--gold); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}
.contact-block h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--gold-light);
  margin-bottom: 0.8rem;
  font-weight: 500;
}
.contact-block p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.75;
}
.contact-block a {
  color: var(--gold-light);
  border-bottom: 1px solid rgba(192,154,90,0.3);
}
.contact-block a:hover { color: var(--white); border-color: var(--white); }
.contact-email {
  font-family: var(--font-mono);
  font-size: 0.78rem !important;
  letter-spacing: 0.04em;
  margin-top: 0.6rem;
  color: rgba(255,255,255,0.5) !important;
}

/* --- Footer --- */
.site-footer-bar {
  background: var(--navy-mid);
  padding: 1.5rem 0;
  text-align: center;
}
.site-footer-bar p {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.35);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* --- Fade-in animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* --- Responsive --- */
@media (max-width: 760px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  .news-date { font-size: 0.7rem; }

  .pi-card {
    flex-direction: column;
  }
  .pi-card .member-photo-placeholder { width: 100%; height: 180px; }

  .cv-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 520px) {
  .section { padding: 4rem 0; }
  .members-grid { grid-template-columns: 1fr 1fr; }
  .empty-card .member-photo-placeholder { height: 100px; }
}