/*
 * Marine Bigdata — components: hero, about-keyvisual, topic-cards, pd-message, latest-news, archive lists.
 */

/* === Hero (emotional, full-bleed) =========================== */

.mbd-hero {
  position: relative;
  min-height: 620px;
  background: var(--bg-hero);
  color: var(--ink-on-dark);
  isolation: isolate;
  overflow: hidden;
}

.mbd-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('../img/hero-underwater.jpg') center/cover no-repeat;
  z-index: -3;
  transform-origin: 60% 40%;
  /* alternate ループは往復とも速度ゼロで折り返す必要があるため、
   * UI 用の --ease-out ではなく対称な ease-in-out を意図的に使用（規約の例外）。 */
  animation: mbd-hero-pan 42s ease-in-out infinite alternate;
  will-change: transform;
}

/* Hero background video (loops silently over the still poster fallback) */
.mbd-hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* No-JS fallback: anchor the cover-crop to the top of the footage for
     the opening shark scene (it swims just below the surface). At runtime
     hero-video-framing.js slides this per scene, because the loop's three
     scenes hold their subjects at different heights. */
  object-position: 50% 0%;
  /* Sits above the ::before still-image fallback (z-index: -3) and below the
     network canvas (0) and overlay (1). The crossfade is "dip-free": only the
     incoming clip fades (0->1) while it sits ONE layer above the outgoing clip
     (--front, z-index -1), which stays fully opaque underneath. The composite
     is therefore always 100% opaque, so the bluish ::before never bleeds
     through mid-fade — that bleed read as a flicker over the near-black EVS
     footage (bio clips matched ::before, so it only showed on EVS). */
  z-index: -2;
  pointer-events: none;
  opacity: 1;
  transition: opacity calc(var(--duration-3) * 2) var(--ease-out);
}

/* Standby clip: pre-rolls off-screen while the active clip plays, then
   crossfades in when hero-video-rotation.js flips the roles. */
.mbd-hero__video--standby {
  opacity: 0;
}

/* Incoming clip during a crossfade: one layer above the opaque outgoing clip
   so it fades in on top of it (never both semi-transparent at once). Still
   below the network canvas (0) and overlay (1). */
.mbd-hero__video--front {
  z-index: -1;
}

@keyframes mbd-hero-pan {
  from { transform: scale(1.02); }
  to   { transform: scale(1.1) translate(-1.2%, -0.8%); }
}

@media (prefers-reduced-motion: reduce) {
  .mbd-hero::before {
    animation: none;
  }
  /* Hide the video and reveal the still ::before fallback.
     NOTE: this class selector intentionally matches BOTH the active and the
     standby element (.mbd-hero__video--standby also carries .mbd-hero__video),
     so all rotation clips stay hidden. hero-video-rotation.js additionally
     early-returns under reduced motion — keep the two in sync (WCAG 2.2.2). */
  .mbd-hero__video {
    display: none;
  }
  /* reduced-motion 時は止める対象が無い（video 非表示・JS 各所も静止）ため、
     一時停止トグル自体を出さない。 */
  .mbd-hero__motion-toggle {
    display: none;
  }
}

/* 一時停止トグルが押されたら、CSS 駆動の背景パンも止める（WCAG 2.2.2）。 */
.mbd-hero.is-motion-paused::before {
  animation-play-state: paused;
}

/* === Hero motion toggle（動画・アニメーション一時停止, WCAG 2.2.2） ===== */

.mbd-hero__motion-toggle {
  position: absolute;
  z-index: 3;
  right: var(--space-3);
  bottom: var(--space-3);
  width: 44px; /* タッチターゲット推奨 44px（WCAG 2.5.5） */
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line-on-dark);
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-abyss) 74%, transparent);
  color: var(--color-foam);
  cursor: pointer;
  transition: background var(--duration-1) var(--ease-out);
}

.mbd-hero__motion-toggle:hover {
  background: var(--color-deep);
}

.mbd-hero__motion-toggle .mbd-hero__motion-icon--play {
  display: none;
}

.mbd-hero__motion-toggle[aria-pressed="true"] .mbd-hero__motion-icon--pause {
  display: none;
}

.mbd-hero__motion-toggle[aria-pressed="true"] .mbd-hero__motion-icon--play {
  display: block;
}

.mbd-hero__network {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.45;
  mix-blend-mode: screen;
}

.mbd-hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--color-abyss) 65%, transparent) 0%,
      color-mix(in srgb, var(--color-abyss) 30%, transparent) 45%,
      transparent 70%
    ),
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--color-abyss) 55%, transparent) 0%,
      color-mix(in srgb, var(--color-abyss) 15%, transparent) 25%,
      transparent 45%,
      color-mix(in srgb, var(--color-abyss) 75%, transparent) 100%
    );
  pointer-events: none;
  z-index: 1;
}

.mbd-hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 178px var(--container-padding) 92px;
}

.mbd-hero__eyebrow {
  color: var(--color-cyan-glow);
  margin: 0 0 var(--space-4);
  opacity: 0.95;
}

.mbd-hero__title {
  font-size: var(--fs-h1);
  font-weight: 500;
  line-height: 1.05; /* README type scale: Hero H1 76px / 1.05 */
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-5);
  max-width: 18ch;
}

.mbd-hero__lead {
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  opacity: 0.82;
  margin: 0;
  /* 「高解像度」等の語中で折り返さないよう、読点・句点のみを改行点にする。
   * overflow-wrap は句読点間が長すぎて収まらない場合の非常用エスケープ。 */
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.mbd-hero__coords {
  position: absolute;
  left: var(--container-padding);
  bottom: var(--space-6);
  font-size: 10px;
  letter-spacing: 0.18em;
  opacity: 0.55;
  z-index: 2;
  line-height: 2;
}

@media (max-width: 768px) {
  .mbd-hero {
    min-height: 600px;
  }
  .mbd-hero__content {
    padding: 160px var(--container-padding) 100px;
  }
  .mbd-hero__coords {
    display: none;
  }
}

/* === Hero data overlay (バイオロギング時系列, 動画シーン連動) ===== */

.mbd-hero__data {
  position: absolute;
  z-index: 2;
  right: var(--container-padding);
  bottom: var(--space-6);
  width: min(42vw, 440px);
  padding: var(--space-4) var(--space-4) var(--space-3);
  background: color-mix(in srgb, var(--color-abyss) 74%, transparent);
  border: 1px solid var(--line-on-dark);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-deep);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-3) var(--ease-out);
}

.mbd-hero__data.is-ready {
  opacity: 1;
}

.mbd-hg-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.mbd-hg-panel {
  transition: opacity var(--duration-2) var(--ease-out);
}

.mbd-hg-cap {
  fill: var(--color-foam);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.mbd-hg-legend {
  fill: var(--ink-on-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
}

.mbd-hg-key-speed,
.mbd-hg-key-temp {
  fill: var(--color-bio);
}

.mbd-hg-key-water {
  fill: var(--color-swell);
}

.mbd-hg-label {
  fill: var(--ink-on-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
}

.mbd-hg-label--y {
  text-anchor: end;
}

.mbd-hg-label--x {
  text-anchor: middle;
}

.mbd-hg-axis--surface {
  stroke: var(--line-on-dark);
  stroke-width: 1;
}

.mbd-hg-grid {
  stroke: var(--line-on-dark);
  stroke-width: 0.5;
  stroke-dasharray: 2 3;
  opacity: 0.5;
}

.mbd-hg-depth-area {
  fill: var(--color-mid);
  opacity: 0.34;
}

.mbd-hg-depth-line {
  fill: none;
  stroke: var(--color-foam);
  stroke-width: 1.6;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.mbd-hg-speed {
  fill: none;
  stroke: var(--color-bio);
  stroke-width: 1.3;
  stroke-linejoin: round;
}

.mbd-hg-temp {
  fill: none;
  stroke: var(--color-bio);
  stroke-width: 1.4;
  stroke-linejoin: round;
}

.mbd-hg-water {
  fill: none;
  stroke: var(--color-swell);
  stroke-width: 1.1;
  stroke-linejoin: round;
  opacity: 0.75;
}

.mbd-hg-playhead {
  stroke: var(--color-cyan-glow);
  stroke-width: 1;
  opacity: 0.7;
}

.mbd-hg-dot {
  fill: var(--color-cyan-glow);
}

.mbd-hg-marker {
  fill: var(--color-bio);
  animation: mbd-hg-pulse 1.1s var(--ease-out) infinite;
}

.mbd-hg-marker-label {
  fill: var(--color-bio);
  font-family: var(--font-mono);
  font-size: 10px; /* README mono scale: 最低 10px / 0.16em */
  letter-spacing: 0.16em;
  text-anchor: middle;
}

@keyframes mbd-hg-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

@media (max-width: 768px) {
  /* 狭幅ではテキストとの重なりを避けるため非表示（coords と同方針） */
  .mbd-hero__data {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mbd-hg-marker {
    animation: none;
  }
}

/* === About / keyvisual ===================================== */

.mbd-about {
  background: var(--bg-page);
  padding: var(--space-9) var(--container-padding);
  position: relative;
}

.mbd-about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 140px;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-abyss) 55%, transparent) 0%,
    color-mix(in srgb, var(--color-abyss) 12%, transparent) 45%,
    transparent 100%
  );
  pointer-events: none;
}

.mbd-about__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  position: relative;
}

.mbd-about__head {
  max-width: 60ch;
  margin: 0 0 var(--space-7);
}

.mbd-about__eyebrow {
  margin: 0 0 var(--space-4);
  color: var(--color-teal);
  opacity: 1;
}

.mbd-about__title {
  font-size: clamp(24px, 3.6vw, 44px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0;
  text-wrap: balance;
}

/* 事業全体概要図（承認コンプをそのまま1枚で掲出）。
   情報量が多い図版なので、1280pxコンテナを越えてビューポート中央に幅広表示し、
   文字・図の視認性を上げる（見出し等は通常コンテナのまま）。 */
.mbd-about__board {
  width: min(1920px, 94vw);
  max-width: none;
  margin: var(--space-6) 0 0 50%;
  transform: translateX(-50%);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-deep);
  background: var(--bg-card);
}

.mbd-about__board img {
  display: block;
  width: 100%;
  height: auto;
}

/* モバイルは 94vw まで縮小すると図版内の文字が判読不能になるため、
   横スクロールコンテナ化して原寸に近い幅（1280px固定）で表示する。 */
.mbd-about__board-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--color-swell) var(--bg-soft);
}

.mbd-about__board-hint {
  display: none;
}

@media (max-width: 768px) {
  .mbd-about__board {
    width: 94vw;
    margin: var(--space-6) 0 0 50%;
  }

  .mbd-about__board img {
    width: 1280px;
    max-width: none;
    height: auto;
  }

  .mbd-about__board-hint {
    display: block;
    margin: var(--space-2) 0 0;
    padding: 0 var(--space-1);
    font-size: var(--fs-body-sm);
    color: var(--ink-muted);
    text-align: center;
  }
}

/* === Topic cards (3課題) ==================================== */

.mbd-topics {
  background: var(--bg-soft);
  padding: var(--space-9) var(--container-padding);
}

.mbd-topics__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-topics__header {
  margin-bottom: var(--space-7);
}

.mbd-topics__header .eyebrow {
  color: var(--color-teal);
  opacity: 1;
}

.mbd-topics__header h2 {
  font-size: clamp(28px, 3.4vw, 48px); /* README type scale: H2 48px */
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: var(--space-3) 0 0;
}

.mbd-topics__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.mbd-topic-card {
  --vantage-text: color-mix(in srgb, var(--vantage, var(--color-swell)), var(--ink) 50%);
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--vantage, var(--color-swell));
  border-radius: var(--radius-md);
  display: flex;
  box-shadow: var(--shadow-card);
  transition: transform var(--duration-2) var(--ease-out), box-shadow var(--duration-2) var(--ease-out), border-color var(--duration-2) var(--ease-out);
}

.mbd-topic-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-deep);
  border-color: color-mix(in srgb, var(--vantage, var(--color-swell)) 35%, var(--line));
}

.mbd-topic-card__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-5) var(--space-5);
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.mbd-topic-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mbd-topic-card__num {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--vantage-text);
}

.mbd-topic-card__badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  padding: 2px 8px;
  background: color-mix(in srgb, var(--vantage, var(--color-swell)) 18%, transparent);
  border: 1px solid var(--vantage, var(--color-swell));
  color: var(--vantage-text);
  border-radius: 999px;
}

.mbd-topic-card__title {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0;
  transition: color var(--duration-2) var(--ease-out);
}

.mbd-topic-card:hover .mbd-topic-card__title {
  color: var(--vantage-text);
}

.mbd-topic-card__pi {
  font-size: 14px;
  opacity: 0.78;
  margin: 0;
}

.mbd-topic-card__pi-aff {
  display: block;
  font-style: normal;
  font-family: var(--font-body-jp);
  font-size: 12px;
  opacity: 0.7;
  letter-spacing: 0.02em;
}

.mbd-topic-card__summary {
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.78;
  margin: 0;
}

.mbd-topic-card__more {
  margin-top: auto;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--vantage-text);
  text-transform: uppercase;
  display: inline-block;
  transition: transform var(--duration-2) var(--ease-out);
}

.mbd-topic-card:hover .mbd-topic-card__more {
  transform: translateX(3px);
}

.mbd-topic-card.is-legacy {
  background: color-mix(in srgb, var(--ink) 2%, transparent);
}

.mbd-topic-card.is-legacy .mbd-topic-card__title {
  opacity: 0.85;
}

@media (max-width: 1023px) {
  .mbd-topics__list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .mbd-topics__list {
    grid-template-columns: 1fr;
  }
}

/* === PD message ============================================= */

.mbd-pd {
  background: var(--bg-band);
  color: var(--ink-on-dark);
  padding: var(--space-9) var(--container-padding);
}

.mbd-pd__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-pd__header .eyebrow {
  opacity: 0.7;
}

.mbd-pd__body {
  margin-top: var(--space-5);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-7);
  align-items: flex-start;
}

.mbd-pd__body--no-photo {
  grid-template-columns: 1fr;
  max-width: 70ch;
}

.mbd-pd__portrait {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.05);
}

.mbd-pd__quote blockquote {
  margin: 0;
  font-size: clamp(24px, 3vw, 38px); /* README type scale: Mission 38px / 1.45 */
  line-height: 1.45;
  letter-spacing: -0.005em;
}

.mbd-pd__cite {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-5);
  font-style: normal;
}

.mbd-pd__name {
  font-size: 16px;
  font-weight: 600;
}

.mbd-pd__role {
  font-size: 11px;
  letter-spacing: 0.16em;
  opacity: 0.7;
  margin-top: 4px;
}

@media (max-width: 768px) {
  .mbd-pd__body {
    grid-template-columns: 1fr;
  }
}

/* === Latest news ============================================ */

.mbd-latest {
  background: var(--bg-page);
  padding: var(--space-9) var(--container-padding);
}

.mbd-latest__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-latest__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}

.mbd-latest__header > .eyebrow {
  color: var(--color-teal);
  opacity: 1;
}

.mbd-latest__header h2 {
  font-size: clamp(28px, 3.4vw, 48px); /* README type scale: H2 48px */
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: var(--space-3) 0 0;
}

.mbd-latest__more {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 4px;
}

.mbd-latest__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.mbd-latest__item {
  border-bottom: 1px solid var(--line);
}

.mbd-latest__item a {
  display: grid;
  grid-template-columns: 110px 130px 1fr;
  gap: var(--space-5);
  padding: var(--space-5) 0;
  text-decoration: none;
  align-items: center;
}

.mbd-latest__date {
  font-size: 12px;
  letter-spacing: 0.06em;
  opacity: 0.65;
}

.mbd-latest__cat {
  opacity: 0.7;
}

.mbd-latest__title {
  font-family: var(--font-display-jp);
  font-feature-settings: "palt";
  font-size: 17px;
  font-weight: 500;
  margin: 0;
  line-height: 1.5;
}

.mbd-latest__empty {
  margin-top: var(--space-5);
  opacity: 0.65;
}

@media (max-width: 768px) {
  .mbd-latest__item a {
    grid-template-columns: 110px 1fr;
    row-gap: var(--space-2);
  }
  .mbd-latest__cat {
    grid-column: 2 / 3;
  }
  .mbd-latest__title {
    grid-column: 1 / -1;
    font-size: 16px;
  }
}

/* === research_topic detail ================================== */

.mbd-topic .eyebrow {
  color: var(--color-teal);
  opacity: 1;
}

.mbd-topic__breadcrumb {
  margin-bottom: var(--space-5);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.mbd-topic__breadcrumb a {
  text-decoration: none;
  color: var(--ink-muted);
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color var(--duration-1) var(--ease-out), border-color var(--duration-1) var(--ease-out);
}

.mbd-topic__breadcrumb a:hover {
  color: var(--color-teal);
  border-bottom-color: currentColor;
}

.mbd-topic__header {
  --vantage-text: color-mix(in srgb, var(--vantage, var(--color-swell)), var(--ink) 50%);
  margin-bottom: var(--space-7);
  border-left: 4px solid var(--vantage, var(--color-swell));
  padding-left: var(--space-5);
}

.mbd-topic__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--vantage-text);
  margin-right: var(--space-3);
}

.mbd-topic__header h1 {
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: var(--space-3) 0 var(--space-3);
  line-height: 1.3;
  text-wrap: balance;
}

.mbd-topic__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 4px 10px;
  background: color-mix(in srgb, var(--vantage, var(--color-swell)) 18%, transparent);
  border: 1px solid var(--vantage, var(--color-swell));
  color: var(--vantage-text, var(--color-swell));
  border-radius: 999px;
  margin-bottom: var(--space-3);
}

.mbd-topic__lead {
  font-size: 16px;
  line-height: 1.85;
  max-width: 56ch;
  margin: 0;
  opacity: 0.85;
}

/* Header with right-side banner (research_topic #02 / Sato → BiP earth) */
.mbd-topic__header--with-banner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
  gap: var(--space-7);
  align-items: start;
}

.mbd-topic__header--with-banner .mbd-topic__header-text {
  min-width: 0;
}

.mbd-topic__banner {
  margin: 0;
}

.mbd-topic__banner-link {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition:
    transform var(--duration-2) var(--ease-out),
    box-shadow var(--duration-2) var(--ease-out),
    border-color var(--duration-2) var(--ease-out);
}

.mbd-topic__banner-link:hover,
.mbd-topic__banner-link:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: color-mix(in srgb, var(--vantage, var(--color-coral)) 60%, var(--line));
}

.mbd-topic__banner-link:focus-visible {
  /* 生の vantage 色は白カード背景で 3:1 を満たさない（coral 2.57:1）ため、
     --vantage-text と同じ流儀で ink と混ぜて暗色化する（coral 混合後 ≈ 5.5:1）。 */
  outline: 2px solid color-mix(in srgb, var(--vantage, var(--color-coral)), var(--ink) 40%);
  outline-offset: 3px;
}

.mbd-topic__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 660;
  object-fit: cover;
  background: var(--color-foam);
}

.mbd-topic__banner-caption {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px var(--space-3);
  padding: var(--space-4) var(--space-5);
  align-items: baseline;
}

.mbd-topic__banner-eyebrow {
  grid-column: 1 / -1;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--vantage, var(--color-coral)), var(--ink) 40%);
}

.mbd-topic__banner-title {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.mbd-topic__banner-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  transition: color var(--duration-1) var(--ease-out);
}

.mbd-topic__banner-link:hover .mbd-topic__banner-meta,
.mbd-topic__banner-link:focus-visible .mbd-topic__banner-meta {
  color: color-mix(in srgb, var(--vantage, var(--color-coral)), var(--ink) 30%);
}

@media (max-width: 900px) {
  .mbd-topic__header--with-banner {
    grid-template-columns: 1fr;
  }

  .mbd-topic__banner {
    max-width: 520px;
  }
}

/* Header figure (research_topic #01 / Takatsuka → EVS 海洋粒子観測).
   課題 02 の BiP バナーと対になる、リンクを持たない静的カード。ヘッダー右カラムを共有する。 */
.mbd-topic__figure {
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.mbd-topic__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 894 / 564;
  object-fit: cover;
  /* Neutral placeholder while loading — matches .mbd-topic__portrait, and the
     EVS capture's own grey base (abyss would flash near-black before load). */
  background: var(--bg-soft);
}

.mbd-topic__figure-caption {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-4) var(--space-5);
}

.mbd-topic__figure-eyebrow {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--vantage-text);
}

.mbd-topic__figure-title {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

@media (max-width: 900px) {
  .mbd-topic__figure {
    max-width: 520px;
  }
}

.mbd-topic__overview {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: var(--space-7);
  margin-bottom: var(--space-9);
  align-items: flex-start;
}

.mbd-topic__overview--single {
  grid-template-columns: 1fr;
  max-width: 380px;
}

.mbd-topic__overview-copy--hint {
  background: rgba(15, 110, 86, 0.06);
  border: 1px dashed color-mix(in srgb, var(--color-teal), transparent 50%);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.mbd-topic__placeholder {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-teal);
  margin: var(--space-3) 0 0;
}

.mbd-topic__placeholder--meta {
  font-size: 11px;
  letter-spacing: 0.06em;
  opacity: 0.65;
  margin-top: var(--space-3);
}

.mbd-topic__overview-copy {
  font-size: 15px;
  line-height: 1.95;
}

/* 概要本文（the_content 由来）の見出しは JP ディスプレイ書体（Shippori Mincho B1 + palt）。
   the_content は class 無しの <h2> 等を出力するため親セレクタで適用。課題01/02/03 共通。
   ウェイトは見出し h1（.mbd-topic__header h1）と揃えて 500。 */
.mbd-topic__overview-copy :is(h2, h3, h4) {
  font-family: var(--font-display-jp);
  font-feature-settings: "palt";
  font-weight: 500;
}

.mbd-topic__pi {
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.mbd-topic__portrait {
  margin: var(--space-4) 0 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--bg-soft);
  border: 1px solid var(--line);
}

.mbd-topic__portrait img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mbd-topic__pi-name {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-top: var(--space-4);
}

.mbd-topic__pi-aff {
  font-size: 13px;
  opacity: 0.7;
  margin-top: 4px;
}

/* PI カード: 所属の下に続く「プロジェクト名」「役職」（任意・ACF pi_project / pi_title）。 */
.mbd-topic__pi-project {
  font-size: 13px;
  margin-top: 6px;
  color: var(--vantage-text);
}

.mbd-topic__pi-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.7;
  margin-top: 2px;
}

/* お知らせが外部リンクのとき、タイトル末尾に付く外部マーク（↗）。 */
.mbd-ext-mark {
  font-size: 0.82em;
  opacity: 0.55;
  margin-left: 0.15em;
}

.mbd-topic__external {
  display: inline-block;
  margin-top: var(--space-4);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: color-mix(in srgb, var(--vantage, var(--color-swell)), var(--ink) 50%);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.mbd-topic__news ul {
  list-style: none;
  margin: var(--space-5) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.mbd-topic__news li {
  border-bottom: 1px solid var(--line);
}

.mbd-topic__news a {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--space-5);
  padding: var(--space-4) 0;
  align-items: center;
  text-decoration: none;
}

@media (max-width: 768px) {
  .mbd-topic__overview {
    grid-template-columns: 1fr;
  }
}

/* === Archive / news listing ================================ */

.mbd-news-archive__filter,
.mbd-archive__filter {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.mbd-news-archive__filter select {
  padding: 6px 10px;
  font-size: 13px;
  border: 1px solid var(--line);
  background: var(--bg-card);
}

.mbd-news-archive__filter button {
  padding: 8px 16px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--color-navy-deep);
  color: var(--color-pearl);
  border: 0;
  cursor: pointer;
}

.mbd-news-archive__list,
.mbd-archive__list,
.mbd-search__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.mbd-news-archive__list li,
.mbd-archive__list li,
.mbd-search__list li {
  border-bottom: 1px solid var(--line);
}

.mbd-news-archive__list a,
.mbd-archive__list a,
.mbd-search__list a {
  display: grid;
  grid-template-columns: 130px 130px 1fr;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  text-decoration: none;
  align-items: center;
}

.mbd-archive__list a,
.mbd-search__list a {
  grid-template-columns: 130px 1fr;
}

.mbd-news-archive__list a h2,
.mbd-archive__list a h2,
.mbd-search__list a h2 {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
}

@media (max-width: 768px) {
  .mbd-news-archive__list a {
    grid-template-columns: 110px 1fr;
    row-gap: var(--space-2);
  }
  .mbd-news-archive__list a h2 {
    grid-column: 1 / -1;
  }
}

/* === Pagination ============================================ */

.nav-links {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.nav-links .current {
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

/* === 404 ================================================== */

.mbd-404__inner {
  text-align: center;
}

.mbd-404 p.font-mono {
  font-size: 12px;
  letter-spacing: 0.18em;
  opacity: 0.55;
}

.mbd-404 h1 {
  font-size: clamp(36px, 5vw, 60px);
  margin: var(--space-3) 0 var(--space-5);
}

.mbd-404__home {
  display: inline-block;
  margin-top: var(--space-5);
  border-bottom: 1px solid currentColor;
  padding-bottom: 4px;
  text-decoration: none;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 11px;
}

/* === Members archive ======================================== */

.mbd-members__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-members__header {
  margin-bottom: var(--space-8);
  border-left: 4px solid var(--color-teal);
  padding-left: var(--space-5);
}

.mbd-members__header .eyebrow {
  color: var(--color-teal);
  opacity: 1;
}

.mbd-members__header h1 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: var(--space-3) 0 var(--space-3);
}

.mbd-members__lead {
  font-size: 15px;
  line-height: 1.85;
  opacity: 0.78;
  max-width: 56ch;
  margin: 0;
}

.mbd-members__group {
  margin-top: var(--space-8);
}

.mbd-members__group-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--line);
}

.mbd-members__group-key {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--color-teal);
  text-transform: uppercase;
}

.mbd-members__group-title {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0;
}

.mbd-members__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-5);
}

.mbd-member-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: transform var(--duration-2) var(--ease-out), box-shadow var(--duration-2) var(--ease-out);
}

.mbd-member-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.mbd-member-card__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4) var(--space-4);
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.mbd-member-card__photo {
  margin: 0;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.mbd-member-card__photo--placeholder {
  background: linear-gradient(160deg, var(--color-deep), var(--color-navy));
  color: var(--color-pearl);
  font-size: clamp(48px, 6vw, 72px);
  letter-spacing: -0.02em;
  opacity: 0.85;
}

.mbd-member-card__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mbd-member-card__name {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
}

.mbd-member-card__aff {
  font-size: 12px;
  opacity: 0.72;
  margin: 0;
  line-height: 1.55;
}

.mbd-member-card__topic {
  margin-top: var(--space-2);
  color: var(--color-teal);
  opacity: 0.9;
  font-size: 10px;
  letter-spacing: 0.16em;
}

/* === Single member ========================================== */

.mbd-member__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-member__breadcrumb {
  margin-bottom: var(--space-5);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.mbd-member__breadcrumb a {
  text-decoration: none;
  color: var(--ink-muted);
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color var(--duration-1) var(--ease-out), border-color var(--duration-1) var(--ease-out);
}

.mbd-member__breadcrumb a:hover {
  color: var(--color-teal);
  border-bottom-color: currentColor;
}

.mbd-member__header {
  margin-bottom: var(--space-7);
  border-left: 4px solid var(--color-teal);
  padding-left: var(--space-5);
}

.mbd-member__header .eyebrow {
  color: var(--color-teal);
  opacity: 1;
}

.mbd-member__role {
  color: var(--ink);
  margin-right: var(--space-3);
  font-size: 12px;
  letter-spacing: 0.18em;
}

.mbd-member__header h1 {
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: var(--space-3) 0 var(--space-3);
  text-wrap: balance;
}

.mbd-member__affiliation {
  font-size: 16px;
  opacity: 0.78;
  margin: 0;
}

.mbd-member__body {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-7);
  margin-bottom: var(--space-9);
  align-items: flex-start;
}

.mbd-member__photo {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-soft);
  box-shadow: var(--shadow-soft);
}

.mbd-member__photo img {
  width: 100%;
  display: block;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.mbd-member__copy {
  font-size: 15px;
  line-height: 1.95;
}

.mbd-member__copy-empty {
  opacity: 0.55;
  font-style: italic;
}

.mbd-member__external {
  display: inline-block;
  margin-top: var(--space-5);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--color-teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.mbd-member__topics {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
}

.mbd-member__topics ul {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
}

.mbd-member__topics a {
  text-decoration: none;
  font-family: var(--font-display-jp);
  font-feature-settings: "palt";
  font-size: 16px;
}

.mbd-member__topics a:hover {
  color: var(--color-teal);
}

@media (max-width: 768px) {
  .mbd-member__body {
    grid-template-columns: 1fr;
  }
  .mbd-member__photo {
    max-width: 240px;
  }
}

/* === Research archive (/research/) ========================= */

.mbd-research-archive {
  padding: var(--space-9) var(--container-padding);
  background: var(--bg-page);
}

.mbd-research-archive__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.mbd-research-archive__header {
  margin-bottom: var(--space-8);
  max-width: 760px;
}

.mbd-research-archive__header .eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-3);
  color: var(--color-teal);
  opacity: 1;
}

.mbd-research-archive__num {
  font-size: 12px;
  letter-spacing: 0.22em;
}

.mbd-research-archive__title {
  font-size: clamp(32px, 4.2vw, 56px);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: var(--space-3) 0 var(--space-4);
  line-height: 1.25;
}

.mbd-research-archive__lead {
  font-size: 15px;
  line-height: 1.9;
  opacity: 0.78;
  margin: 0;
}

.mbd-research-archive__placeholder {
  border-top: 1px solid var(--line);
  padding: var(--space-6) 0;
  opacity: 0.7;
}

.mbd-research-archive__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.mbd-research-archive__item {
  --vantage-text: color-mix(in srgb, var(--vantage, var(--color-swell)), var(--ink) 55%);
  border-bottom: 1px solid var(--line);
  transition: background var(--duration-2) var(--ease-out);
}

.mbd-research-archive__item:hover {
  background: color-mix(in srgb, var(--vantage, var(--color-swell)) 6%, transparent);
}

.mbd-research-archive__item.is-legacy {
  background: color-mix(in srgb, var(--color-deep) 2%, transparent);
}

.mbd-research-archive__row {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 320px 60px;
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-7) 0;
  text-decoration: none;
  color: inherit;
}

.mbd-research-archive__row-num {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--vantage-text);
}

.mbd-research-archive__row-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

.mbd-research-archive__row-tag {
  color: var(--vantage-text);
  opacity: 1;
}

.mbd-research-archive__row-title {
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -0.01em;
  /* CJK + ASCII 混在で（EVS) 等のクラスタが折り返さず溢れるのを防ぐ */
  overflow-wrap: anywhere;
  word-break: normal;
  line-break: strict;
  text-wrap: pretty;
  transition: color var(--duration-2) var(--ease-out);
}

.mbd-research-archive__row:hover .mbd-research-archive__row-title,
.mbd-research-archive__row:focus-visible .mbd-research-archive__row-title {
  color: var(--vantage-text);
}

.mbd-research-archive__row-summary {
  font-size: 13px;
  line-height: 1.85;
  opacity: 0.78;
  margin-top: var(--space-1);
  overflow-wrap: anywhere;
  line-break: strict;
}

.mbd-research-archive__row-badge {
  align-self: flex-start;
  margin-top: var(--space-2);
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 3px 10px;
  background: color-mix(in srgb, var(--vantage, var(--color-swell)) 18%, transparent);
  border: 1px solid var(--vantage, var(--color-swell));
  color: var(--vantage-text);
  border-radius: 999px;
}

.mbd-research-archive__row-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.85;
  overflow-wrap: anywhere;
}

.mbd-research-archive__row-aff {
  opacity: 0.75;
  font-size: 12px;
  letter-spacing: 0.01em;
}

.mbd-research-archive__row-pi {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.mbd-research-archive__row-arrow {
  justify-self: end;
  font-size: 26px;
  color: var(--vantage-text);
  transition: transform var(--duration-2) var(--ease-out);
}

.mbd-research-archive__row:hover .mbd-research-archive__row-arrow,
.mbd-research-archive__row:focus-visible .mbd-research-archive__row-arrow {
  transform: translateX(6px);
}

.mbd-research-archive__row:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 4px;
}

@media (max-width: 1080px) {
  .mbd-research-archive__row {
    grid-template-columns: 48px minmax(0, 1fr) 44px;
    row-gap: var(--space-3);
  }
  .mbd-research-archive__row-meta {
    grid-column: 2 / -1;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-2) var(--space-4);
  }
}

@media (max-width: 560px) {
  .mbd-research-archive {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
  .mbd-research-archive__row {
    grid-template-columns: 36px minmax(0, 1fr);
    column-gap: var(--space-3);
    row-gap: var(--space-3);
    padding: var(--space-6) 0;
  }
  .mbd-research-archive__row-arrow {
    grid-column: 2;
    justify-self: start;
    font-size: 22px;
  }
}