/* ==========================================================================
   Nerio Sample 研究室 — Sample Site
   ========================================================================== */

/* Reset & Base
   ------------------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  overflow-x: hidden !important;
}

:root {
  --color-navy: #0e3b6c;
  --color-navy-dark: #082a52;
  --color-navy-light: #2a5a91;
  --color-green: #5fa987;
  --color-green-dark: #4a8a6c;
  --color-bg: #ffffff;
  --color-bg-soft: #f5f7fa;
  --color-bg-soft2: #eef2f6;
  --color-text: #1d2733;
  --color-text-sub: #5b6776;
  --color-border: #e1e7ee;
  --font-sans: "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Cormorant Garamond", "Noto Serif JP", "Times New Roman", serif;
  --container: 1140px;
  --header-h: 72px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-navy);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-green);
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* Sample Ribbon
   ------------------------------------------------------------------------ */
.sample-ribbon {
  position: fixed;
  top: 22px;
  right: -68px;
  z-index: 200;
  width: 240px;
  padding: 6px 0;
  background-color: #d94a4a;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: center;
  transform: rotate(45deg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  pointer-events: none;
}

@media (max-width: 768px) {
  .sample-ribbon {
    top: 16px;
    right: -78px;
    width: 220px;
    font-size: 11px;
    padding: 5px 0;
  }
}

/* Header
   ------------------------------------------------------------------------ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 50;
}

.header > .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-navy);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.header__logo small {
  display: block;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-green);
  text-transform: uppercase;
  margin-top: 2px;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__nav-link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text);
  position: relative;
  padding: 4px 0;
}

.header__nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-green);
  transition: width 0.25s ease;
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  z-index: 101;
}

.header__burger span {
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-navy);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.header__burger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__burger.is-open span:nth-child(2) {
  opacity: 0;
}

.header__burger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header__overlay {
  display: none;
}

@media (max-width: 1023px) {
  .header__nav {
    position: fixed;
    top: 0;
    right: 0;
    left: auto;
    width: 280px;
    max-width: 100vw;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    background-color: #fff;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.08);
    z-index: 100;
    padding: 0 32px;
  }

  .header__nav.is-open {
    transform: translateX(0);
  }

  .header__nav-link {
    font-size: 17px;
  }

  .header__burger {
    display: flex;
  }

  .header__overlay {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 99;
  }

  .header__overlay.is-visible {
    opacity: 1;
    visibility: visible;
  }
}

/* Hero
   ------------------------------------------------------------------------ */
.hero {
  position: relative;
  min-height: 88vh;
  padding-top: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(rgba(8, 28, 60, 0.65), rgba(8, 28, 60, 0.65)),
    url("https://images.unsplash.com/photo-1532094349884-543bc11b234d?w=1800&q=80&auto=format");
  background-size: cover;
  background-position: center;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 80px 24px;
}

.hero__eyebrow {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 24px;
  padding: 6px 16px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero__subtitle {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 36px;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background-color: var(--color-green);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.1em;
  border-radius: 2px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.hero__cta:hover {
  background-color: var(--color-green-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* Notice strip
   ------------------------------------------------------------------------ */
.notice-strip {
  background-color: #fff8e1;
  border-bottom: 1px solid #ecd998;
  color: #735a13;
  font-size: 13px;
  text-align: center;
  padding: 12px 24px;
  line-height: 1.7;
}

/* Section common
   ------------------------------------------------------------------------ */
.section {
  padding: 100px 0;
}

.section--alt {
  background-color: var(--color-bg-soft);
}

.section__head {
  text-align: center;
  margin-bottom: 60px;
}

.section__eyebrow {
  display: block;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 500;
  color: var(--color-navy);
  letter-spacing: 0.04em;
}

.section__title::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  background-color: var(--color-green);
  margin: 20px auto 0;
}

/* Research
   ------------------------------------------------------------------------ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.research-card {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(14, 59, 108, 0.08);
}

.research-card__img {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.research-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.research-card:hover .research-card__img img {
  transform: scale(1.05);
}

.research-card__body {
  padding: 24px;
}

.research-card__num {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--color-green);
  margin-bottom: 8px;
}

.research-card__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 12px;
  line-height: 1.5;
}

.research-card__desc {
  font-size: 14px;
  color: var(--color-text-sub);
  line-height: 1.8;
}

/* Members
   ------------------------------------------------------------------------ */
.members-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}

.member-card {
  text-align: center;
}

.member-card__photo {
  width: 140px;
  height: 140px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #fff;
  box-shadow: 0 4px 16px rgba(14, 59, 108, 0.1);
}

.member-card__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.member-card__role {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 6px;
}

.member-card__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 4px;
}

.member-card__name-en {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--color-text-sub);
  margin-bottom: 12px;
  font-style: italic;
}

.member-card__field {
  font-size: 13px;
  color: var(--color-text-sub);
  line-height: 1.7;
}

/* Publications
   ------------------------------------------------------------------------ */
.publications {
  max-width: 880px;
  margin: 0 auto;
}

.publication {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.publication:first-child {
  border-top: 1px solid var(--color-border);
}

.publication__year {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--color-green);
  letter-spacing: 0.05em;
}

.publication__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 6px;
  line-height: 1.6;
}

.publication__meta {
  font-size: 13px;
  color: var(--color-text-sub);
  font-style: italic;
}

/* Access
   ------------------------------------------------------------------------ */
.access-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.access-info dt {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 6px;
  margin-top: 20px;
}

.access-info dt:first-child {
  margin-top: 0;
}

.access-info dd {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
}

.access-map {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #e8eef5 0%, #d4e0eb 100%);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-sub);
  font-size: 14px;
  position: relative;
  overflow: hidden;
}

.access-map::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14, 59, 108, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 59, 108, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

.access-map__pin {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.access-map__pin-icon {
  width: 24px;
  height: 24px;
  background-color: var(--color-navy);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  box-shadow: 0 4px 12px rgba(14, 59, 108, 0.3);
}

/* News
   ------------------------------------------------------------------------ */
.news-list {
  max-width: 800px;
  margin: 0 auto;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 100px 1fr;
  gap: 20px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.news-item:first-child {
  border-top: 1px solid var(--color-border);
}

.news-item__date {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--color-text-sub);
  letter-spacing: 0.05em;
}

.news-item__cat {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  background-color: var(--color-navy);
  color: #fff;
  border-radius: 2px;
  text-align: center;
  width: fit-content;
}

.news-item__cat--event {
  background-color: var(--color-green);
}

.news-item__cat--media {
  background-color: #b07a3a;
}

.news-item__title {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
}

/* Footer
   ------------------------------------------------------------------------ */
.footer {
  background-color: var(--color-navy-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: 60px 0 24px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer__title {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.footer__desc {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.65);
}

.footer__heading {
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 16px;
}

.footer__links li {
  margin-bottom: 8px;
}

.footer__links a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.75);
}

.footer__links a:hover {
  color: #fff;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  line-height: 1.8;
}

.footer__bottom strong {
  color: #ffd866;
}

/* Fade-in animation
   ------------------------------------------------------------------------ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Responsive
   ------------------------------------------------------------------------ */
@media (max-width: 1023px) {
  .section {
    padding: 80px 0;
  }

  .access-wrap {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 768px) {
  .header__logo {
    font-size: 18px;
  }

  .header__logo small {
    font-size: 9px;
  }

  .hero {
    min-height: 78vh;
  }

  .section {
    padding: 64px 0;
  }

  .section__head {
    margin-bottom: 40px;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .publication {
    grid-template-columns: 60px 1fr;
    gap: 16px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }

  .hero__inner {
    padding: 60px 18px;
  }

  .research-card__body {
    padding: 20px;
  }

  .member-card__photo {
    width: 120px;
    height: 120px;
  }
}