/* ===================================
   SeaPorch - 共通スタイルシート
   海洋観測ロボティクス / 研究開発プロジェクト
   =================================== */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-deep-darker: #062a47;
  --color-deep: #0a3d62;
  --color-sea: #1e5f8e;
  --color-wave: #4a90b8;
  --color-foam: #cfe8f3;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f8fb;
  --color-accent: #00b4d8;
  --color-accent-dark: #0094b6;
  --color-teal: #1c7a8c;
  --color-ink: #1a2b42;
  --color-text: #2c3e50;
  --color-muted: #5a7186;
  --color-line: #e1e8ee;
  --color-status-active: #2ea27a;
  --color-status-planned: #8a9bb0;
  --color-status-prototype: #d68f3a;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --header-height: 88px;
  --shadow-sm: 0 2px 8px rgba(10, 61, 98, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 61, 98, 0.1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: var(--header-height);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 760px;
}

/* --- セクションヘッダー --- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header__en {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-header__title {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-deep);
  letter-spacing: 0.08em;
}

.section-header__line {
  width: 56px;
  height: 2px;
  background: var(--color-accent);
  margin: 16px auto 0;
}

.section-header--left {
  text-align: left;
}

.section-header--left .section-header__line {
  margin-left: 0;
}

/* --- ボタン --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 999px;
  transition: all 0.2s ease;
  cursor: pointer;
  letter-spacing: 0.05em;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--color-deep);
  border-color: var(--color-line);
}

.btn--ghost:hover {
  background: var(--color-bg-alt);
  color: var(--color-deep);
  border-color: var(--color-wave);
}

/* --- ステータスバッジ --- */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 999px;
  color: #fff;
  font-family: var(--font-sans);
  vertical-align: middle;
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.85;
}

.status-badge--active {
  background: var(--color-status-active);
}

.status-badge--prototype {
  background: var(--color-status-prototype);
}

.status-badge--planned {
  background: var(--color-status-planned);
}

/* ===================================
   ヘッダー
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  z-index: 100;
  overflow: visible;
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

.header.is-scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.96);
}

.header__inner {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  overflow: visible;
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  height: 72px;
  width: auto;
  display: block;
}

.header__nav-list {
  display: flex;
  gap: 28px;
  align-items: center;
}

.header__nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-ink);
  position: relative;
  padding: 6px 0;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: all 0.2s ease;
  transform: translateX(-50%);
}

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

.header__nav-link.is-active {
  color: var(--color-deep);
}

.header__hamburger {
  display: none;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
}

.header__hamburger span {
  position: absolute;
  left: 6px;
  width: 24px;
  height: 2px;
  background: var(--color-deep);
  transition: all 0.25s ease;
}

.header__hamburger span:nth-child(1) { top: 11px; }
.header__hamburger span:nth-child(2) { top: 17px; }
.header__hamburger span:nth-child(3) { top: 23px; }

.header__hamburger.is-active span:nth-child(1) {
  top: 17px;
  transform: rotate(45deg);
}

.header__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}

.header__hamburger.is-active span:nth-child(3) {
  top: 17px;
  transform: rotate(-45deg);
}

/* ===================================
   ヒーロー（Top）
   =================================== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--header-height) 24px 80px;
  background: linear-gradient(135deg, var(--color-deep-darker) 0%, var(--color-deep) 55%, var(--color-teal) 100%);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0,180,216,0.18) 0%, transparent 50%);
  pointer-events: none;
}

.hero__sonar {
  position: absolute;
  top: 14%;
  left: 6%;
  width: 240px;
  height: 240px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100' fill='none' stroke='%23cfe8f3' stroke-width='0.6'><circle cx='50' cy='50' r='14'/><circle cx='50' cy='50' r='24'/><circle cx='50' cy='50' r='34'/><circle cx='50' cy='50' r='44'/></svg>") no-repeat center / contain;
  opacity: 0.18;
  pointer-events: none;
  z-index: 1;
}

.hero__waveform {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 80px;
  transform: translateY(-50%);
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 80' fill='none' stroke='%23cfe8f3' stroke-width='1'><path d='M0,40 Q60,10 120,40 T240,40 T360,40 T480,40 T600,40 T720,40 T840,40 T960,40 T1080,40 T1200,40 T1320,40 T1440,40'/></svg>") no-repeat center / cover;
  opacity: 0.12;
  pointer-events: none;
  z-index: 1;
}

.hero__shark {
  position: absolute;
  right: -4%;
  bottom: 18%;
  width: 380px;
  height: 200px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 100' fill='%23cfe8f3'><path d='M10,60 Q40,30 90,40 L130,32 L150,20 L155,38 L188,42 Q170,55 150,55 L130,60 Q100,75 70,72 L50,78 L40,68 Q22,68 10,60 Z M150,52 L160,48 L165,52 Z'/></svg>") no-repeat center / contain;
  opacity: 0.16;
  pointer-events: none;
  z-index: 1;
  animation: hero-shark-float 14s ease-in-out infinite;
}

@keyframes hero-shark-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero__content {
  position: relative;
  text-align: center;
  max-width: 880px;
  z-index: 2;
}

.hero__sub {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  letter-spacing: 0.4em;
  margin-bottom: 24px;
  color: var(--color-foam);
  text-transform: uppercase;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.06em;
  margin-bottom: 28px;
}

.hero__desc {
  font-size: 1rem;
  line-height: 1.95;
  color: rgba(255,255,255,0.92);
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 80px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 80' preserveAspectRatio='none'><path fill='%23ffffff' d='M0,32L60,37.3C120,43,240,53,360,53.3C480,53,600,43,720,37.3C840,32,960,32,1080,37.3C1200,43,1320,53,1380,58.7L1440,64L1440,80L0,80Z'/></svg>") no-repeat center / cover;
  pointer-events: none;
  z-index: 2;
}

/* ===================================
   ページヘッダー（共通：下層ページ用）
   =================================== */
.page-hero {
  position: relative;
  padding: calc(var(--header-height) + 80px) 24px 100px;
  text-align: center;
  background: linear-gradient(135deg, var(--color-deep-darker) 0%, var(--color-deep) 60%, var(--color-teal) 100%);
  color: #fff;
  overflow: hidden;
}

.page-hero__sub {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  color: var(--color-foam);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.page-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.page-hero__desc {
  font-size: 1rem;
  color: rgba(255,255,255,0.88);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.95;
}

.page-hero__wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 60px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60' preserveAspectRatio='none'><path fill='%23ffffff' d='M0,24L60,28C120,32,240,40,360,40C480,40,600,32,720,28C840,24,960,24,1080,28C1200,32,1320,40,1380,44L1440,48L1440,60L0,60Z'/></svg>") no-repeat center / cover;
  pointer-events: none;
}

/* ===================================
   Mission（Top / Vision）
   =================================== */
.mission {
  padding: 100px 0;
  background: var(--color-bg);
}

.mission__lead {
  text-align: center;
  font-size: 1.08rem;
  line-height: 2;
  color: var(--color-text);
  max-width: 760px;
  margin: 0 auto 48px;
}

.mission__lead strong {
  color: var(--color-deep);
  font-weight: 700;
}

.mission__blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: 820px;
  margin: 0 auto;
}

.mission-block {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: 28px 32px;
  border-radius: 6px;
}

.mission-block__title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-deep);
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}

.mission-block__desc {
  font-size: 0.95rem;
  line-height: 1.95;
  color: var(--color-text);
}

/* ===================================
   Why SeaPorch
   =================================== */
.why {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.why__lead {
  text-align: center;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--color-text);
  max-width: 760px;
  margin: 0 auto 48px;
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.why-card {
  background: #fff;
  border-radius: 14px;
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-line);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.why-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.why-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-teal) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 18px;
}

.why-card__icon svg {
  width: 24px;
  height: 24px;
}

.why-card__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-deep);
  margin-bottom: 10px;
  letter-spacing: 0.03em;
}

.why-card__desc {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-muted);
}

/* ===================================
   Roadmap Summary（Top）
   =================================== */
.roadmap {
  padding: 100px 0;
  background: var(--color-bg);
}

.roadmap__project + .roadmap__project {
  margin-top: 64px;
}

.roadmap__project-header {
  margin-bottom: 28px;
}

.roadmap__project-eyebrow {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--color-teal);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.roadmap__project-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  color: var(--color-deep);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.roadmap__project-desc {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.85;
  max-width: 720px;
}

.roadmap__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.roadmap__grid--four {
  grid-template-columns: repeat(4, 1fr);
}

.roadmap__grid--single {
  grid-template-columns: 1fr;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

.phase-card {
  position: relative;
  background: #fff;
  border-radius: 14px;
  padding: 28px 22px;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.phase-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.phase-card__num {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.phase-card__title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-deep);
  margin-bottom: 12px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}

.phase-card__desc {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--color-muted);
  flex: 1;
  margin-bottom: 16px;
}

.phase-card__status {
  align-self: flex-start;
}

.roadmap__more {
  text-align: center;
  margin-top: 40px;
}

/* ===================================
   Roadmap Timeline（roadmap.html 用）
   =================================== */
.roadmap-timeline {
  padding: 100px 0;
  background: var(--color-bg);
}

.roadmap-timeline__list {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
  padding-left: 40px;
}

.roadmap-timeline__list::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-teal) 50%, var(--color-status-planned) 100%);
}

.roadmap-timeline__item {
  position: relative;
  margin-bottom: 48px;
}

.roadmap-timeline__item:last-child {
  margin-bottom: 0;
}

.roadmap-timeline__marker {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-bg);
}

.roadmap-timeline__item--planned .roadmap-timeline__marker {
  border-color: var(--color-status-planned);
}

.roadmap-timeline__item--prototype .roadmap-timeline__marker {
  border-color: var(--color-status-prototype);
}

.roadmap-timeline__body {
  background: var(--color-bg-alt);
  border-radius: 14px;
  padding: 28px 32px;
  border: 1px solid var(--color-line);
}

.roadmap-timeline__head {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.roadmap-timeline__phase {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.roadmap-timeline__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-deep);
  letter-spacing: 0.04em;
  width: 100%;
}

.roadmap-timeline__desc {
  font-size: 0.95rem;
  line-height: 1.95;
  color: var(--color-text);
  margin-bottom: 16px;
}

.roadmap-timeline__themes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.roadmap-timeline__theme {
  font-size: 0.75rem;
  background: #fff;
  color: var(--color-deep);
  border: 1px solid var(--color-line);
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

/* ===================================
   Research Themes（Top / Research）
   =================================== */
.research-themes {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.research-themes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.research-theme-card {
  background: #fff;
  border-radius: 14px;
  padding: 32px 26px;
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}

.research-theme-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.research-theme-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 18px;
}

.research-theme-card__icon svg {
  width: 24px;
  height: 24px;
}

.research-theme-card__eyebrow {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--color-teal);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.research-theme-card__title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-deep);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.research-theme-card__desc {
  font-size: 0.93rem;
  line-height: 1.9;
  color: var(--color-muted);
  flex: 1;
  margin-bottom: 14px;
}

.research-theme-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.research-theme-tag {
  font-size: 0.72rem;
  background: var(--color-bg-alt);
  color: var(--color-deep);
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

/* ===================================
   Current Focus（Top）
   =================================== */
.current-focus {
  padding: 100px 0;
  background: var(--color-bg);
}

.current-focus__lead {
  text-align: center;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--color-text);
  max-width: 760px;
  margin: 0 auto 48px;
}

.current-focus__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 880px;
  margin: 0 auto;
}

.focus-card {
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, #fff 100%);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--color-line);
}

.focus-card__label {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.focus-card__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--color-deep);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.focus-card__desc {
  font-size: 0.93rem;
  line-height: 1.9;
  color: var(--color-text);
}

/* ===================================
   Research-Driven Development (Approach)
   =================================== */
.rdd {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.rdd__lead {
  text-align: center;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--color-text);
  max-width: 760px;
  margin: 0 auto 48px;
}

.rdd__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.rdd-step {
  background: #fff;
  border-radius: 12px;
  padding: 24px 20px;
  border: 1px solid var(--color-line);
  text-align: center;
}

.rdd-step__num {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.rdd-step__title {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-deep);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.rdd-step__desc {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.8;
}

/* ===================================
   Latest Posts（Top）
   =================================== */
.latest-posts {
  padding: 100px 0;
  background: var(--color-bg);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.post-card {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-line);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.post-card__thumb {
  height: 160px;
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-teal) 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-family: var(--font-serif);
  letter-spacing: 0.2em;
  font-size: 0.85rem;
}

.post-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__meta {
  display: flex;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-bottom: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.post-card__date {
  font-family: var(--font-serif);
  letter-spacing: 0.08em;
}

.post-card__tag {
  background: var(--color-foam);
  color: var(--color-deep);
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}

.post-card__title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-deep);
  line-height: 1.6;
  margin-bottom: 10px;
}

.post-card__excerpt {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.7;
  flex: 1;
}

.latest-posts__more,
.blog-index__more {
  text-align: center;
  margin-top: 40px;
}

.posts-loading,
.posts-empty,
.posts-error {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  color: var(--color-muted);
  font-size: 0.95rem;
  background: var(--color-bg);
  border: 1px dashed var(--color-line);
  border-radius: 14px;
}

.posts-error a {
  color: var(--color-accent);
  text-decoration: underline;
  margin-left: 6px;
}

/* ===================================
   Research ページ（詳細）
   =================================== */
.research-detail {
  padding: 100px 0;
  background: var(--color-bg);
}

.research-detail__lead {
  text-align: center;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--color-text);
  max-width: 760px;
  margin: 0 auto 56px;
}

.research-detail__list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 880px;
  margin: 0 auto;
}

.research-detail-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  background: var(--color-bg-alt);
  border-radius: 16px;
  padding: 28px 32px;
  border: 1px solid var(--color-line);
}

.research-detail-item__icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-teal) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.research-detail-item__icon svg {
  width: 28px;
  height: 28px;
}

.research-detail-item__eyebrow {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--color-teal);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.research-detail-item__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-deep);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.research-detail-item__desc {
  font-size: 0.95rem;
  line-height: 1.95;
  color: var(--color-text);
  margin-bottom: 14px;
}

.research-detail-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ===================================
   Member ページ
   =================================== */
.members {
  padding: 100px 0;
  background: var(--color-bg);
}

.member {
  background: var(--color-bg-alt);
  border-radius: 20px;
  padding: 48px;
  margin-bottom: 40px;
  border: 1px solid var(--color-line);
}

.member__head {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 36px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-line);
}

.member__avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-teal) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.member__avatar--image {
  background: #fff;
}

.member__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.member__name {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}

.member__name-en {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: block;
}

.member__sns {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.member__sns a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-deep);
  border: 1px solid var(--color-line);
  transition: all 0.2s ease;
}

.member__sns a:hover {
  background: var(--color-deep);
  color: #fff;
  transform: translateY(-2px);
  border-color: var(--color-deep);
}

.member__sns svg {
  width: 18px;
  height: 18px;
}

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

.member-block {
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--color-line);
}

.member-block--full {
  grid-column: 1 / -1;
}

.member-block__title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-foam);
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.member-block__title::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.member-list {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.9;
}

.member-list li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 4px;
}

.member-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 1px;
  background: var(--color-wave);
}

.member-list--ranks li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding-left: 0;
}

.member-list--ranks li::before {
  display: none;
}

.member-list__rank {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-accent);
  min-width: 40px;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

.member-list__date {
  color: var(--color-muted);
  font-size: 0.78rem;
  margin-left: auto;
  white-space: nowrap;
  font-family: var(--font-serif);
  letter-spacing: 0.05em;
}

.member--placeholder {
  padding: 48px;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, #fff 100%);
  border: 1px dashed var(--color-wave);
}

.member--placeholder .member__name {
  color: var(--color-muted);
}

.member--placeholder .member__head {
  grid-template-columns: 1fr;
  text-align: center;
  gap: 20px;
}

.member--placeholder .member__body {
  grid-template-columns: 1fr;
}

.member--placeholder .member-block {
  text-align: left;
}

.member--placeholder .member__avatar {
  background: var(--color-foam);
  color: var(--color-wave);
  margin: 0 auto 24px;
}

/* ===================================
   Contact ページ
   =================================== */
.contact {
  padding: 100px 0;
  background: var(--color-bg);
}

.contact__lead {
  text-align: center;
  font-size: 1.02rem;
  line-height: 2;
  color: var(--color-text);
  max-width: 640px;
  margin: 0 auto 32px;
}

.contact__channels {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.channel {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--color-line);
  transition: all 0.25s ease;
}

.channel:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  color: var(--color-deep);
}

.channel__icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-deep);
  flex-shrink: 0;
}

.channel__icon svg {
  width: 26px;
  height: 26px;
}

.channel__label {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--color-accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 4px;
  display: block;
}

.channel__name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-deep);
}

.contact__note {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: 24px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.9;
}

.contact__note strong {
  color: var(--color-deep);
}

.contact__examples {
  margin: 16px 0 8px;
}

.contact__examples li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  line-height: 1.8;
}

.contact__examples li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 13px;
  width: 8px;
  height: 1px;
  background: var(--color-wave);
}

.contact__note p:last-child {
  margin-bottom: 0;
}

/* ===================================
   フェードイン
   =================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===================================
   フッター
   =================================== */
.footer {
  background: var(--color-deep-darker);
  color: rgba(255,255,255,0.85);
  padding: 64px 0 24px;
  position: relative;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__brand-img {
  height: 40px;
  width: auto;
  display: block;
  margin-bottom: 14px;
}

.footer__brand-tagline {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--color-foam);
  margin-bottom: 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.footer__brand-desc {
  font-size: 0.85rem;
  line-height: 1.9;
  color: rgba(255,255,255,0.7);
}

.footer__heading {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-foam);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer__nav-list li {
  margin-bottom: 10px;
}

.footer__nav-list a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.75);
}

.footer__nav-list a:hover {
  color: var(--color-accent);
}

.footer__sns-links {
  display: flex;
  gap: 12px;
}

.footer__sns-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: all 0.2s ease;
}

.footer__sns-link:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}

.footer__sns-link svg {
  width: 18px;
  height: 18px;
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.05em;
}

/* ===================================
   レスポンシブ
   =================================== */
@media (max-width: 960px) {
  .why__grid,
  .research-themes__grid,
  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .roadmap__grid--four {
    grid-template-columns: repeat(2, 1fr);
  }

  .rdd__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .current-focus__grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 720px) {
  :root {
    --header-height: 76px;
  }

  .header__logo-img {
    height: 60px;
  }

  .header__hamburger {
    display: block;
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    padding: 16px 0;
  }

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

  .header__nav-list {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }

  .header__nav-list li {
    border-bottom: 1px solid var(--color-line);
  }

  .header__nav-link {
    display: block;
    padding: 16px 24px;
  }

  .header__nav-link::after {
    display: none;
  }

  .why__grid,
  .research-themes__grid,
  .posts-grid,
  .roadmap__grid--four,
  .rdd__grid {
    grid-template-columns: 1fr;
  }

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

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

  .member {
    padding: 28px 20px;
  }

  .member__head {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 20px;
  }

  .member__avatar {
    margin: 0 auto;
    width: 110px;
    height: 110px;
    font-size: 2rem;
  }

  .member__sns {
    justify-content: center;
  }

  .mission,
  .why,
  .roadmap,
  .roadmap-timeline,
  .research-themes,
  .research-detail,
  .current-focus,
  .rdd,
  .latest-posts,
  .members,
  .contact {
    padding: 64px 0;
  }

  .hero {
    min-height: 80vh;
  }

  .hero__shark {
    width: 240px;
    height: 130px;
    bottom: 10%;
  }

  .hero__sonar {
    width: 160px;
    height: 160px;
  }

  .roadmap-timeline__body {
    padding: 22px 22px;
  }

  .research-detail-item {
    grid-template-columns: 1fr;
    padding: 24px 22px;
  }

  .research-detail-item__icon {
    margin: 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }

  .hero__shark {
    animation: none;
  }
}