/* ==========================================================================
   KASA (Kogakuin AeroSpace Adventurers) - Official Website Styles
   Aesthetic: Bright, Clean, Minimalist, Academic & Engineering Design
   ========================================================================== */

/* --- Design Tokens --- */
:root {
  /* Colors */
  --color-primary: #0a2540;        /* Deep Space Navy */
  --color-primary-light: #1e3a5f;
  --color-secondary: #0284c7;      /* Clear Sky Blue */
  --color-secondary-light: #e0f2fe;/* Pale Sky Blue Tint */
  --color-accent: #ea580c;         /* Launch Amber/Orange (accent only) */
  --color-accent-light: #fff7ed;
  
  --color-bg: #ffffff;             /* Clean Pure White */
  --color-bg-subtle: #f8fafc;      /* Subtle Slate Light */
  --color-bg-card: #ffffff;
  --color-bg-muted: #f1f5f9;
  
  --color-text-main: #0f172a;      /* Slate 900 (High contrast readability) */
  --color-text-sub: #475569;       /* Slate 600 */
  --color-text-muted: #94a3b8;     /* Slate 400 */
  --color-text-light: #ffffff;
  
  --color-border: #e2e8f0;         /* Slate 200 */
  --color-border-hover: #cbd5e1;
  
  /* Typography */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', 'Noto Sans JP', sans-serif;
  
  /* Shadows & Radius */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.08), 0 4px 10px -2px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 20px 35px -6px rgba(15, 23, 42, 0.12);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.7;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* 日本語の自然な禁則処理・孤立文字防止 */
  line-break: strict;
  word-break: normal;
  overflow-wrap: break-word;
}

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

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-subtle {
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 1140px;
  margin: 0 auto 3.5rem auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-secondary);
  background-color: var(--color-secondary-light);
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  text-wrap: balance;
  word-break: auto-phrase;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  line-height: 1.75;
  /* 1文を横長に続けて表示するためbalanceは外し、極端な孤立文字のみprettyで防止 */
  text-wrap: pretty;
}

/* --- Typography & Responsive Break Utilities --- */
.text-nowrap {
  display: inline-block;
  white-space: nowrap;
}

/* PC（幅1080px以上）で改行させず横長に1行で表示するユーティリティ */
@media (min-width: 1080px) {
  .nowrap-pc {
    display: inline-block;
    white-space: nowrap;
  }
}

.pc-only {
  display: inline;
}

.sp-only {
  display: none;
}

/* --- Navigation Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
}

.logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.logo-sub {
  font-size: 0.6875rem;
  color: var(--color-text-sub);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-sub);
  transition: color var(--transition-fast);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-secondary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.35rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #0369a1;
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-primary);
}

.btn-outline:hover {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  background-color: var(--color-secondary-light);
}

.btn-sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-primary);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  padding-top: calc(var(--header-height) + 3.5rem);
  padding-bottom: 4.5rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('../assets/images/earthrise_apollo8.jpg');
  background-size: cover;
  background-position: center 30%;
  opacity: 0.22;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse 95% 85% at 50% 45%, black 45%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 95% 85% at 50% 45%, black 45%, transparent 100%);
}

.hero > .container {
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0.9rem;
  background-color: #f1f5f9;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  width: fit-content;
  margin-bottom: 1.25rem;
}

.hero-pill-badge {
  background-color: var(--color-secondary);
  color: #ffffff;
  font-size: 0.6875rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-title-accent {
  color: var(--color-secondary);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-sub);
  line-height: 1.75;
  margin-bottom: 2rem;
  text-wrap: balance;
  text-wrap: pretty;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-trust-badges {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-sub);
}

.trust-icon {
  width: 20px;
  height: 20px;
  color: var(--color-secondary);
  flex-shrink: 0;
}

.hero-media {
  position: relative;
}

.hero-image-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  background-color: #ffffff;
}

.hero-main-img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hero-image-card:hover .hero-main-img {
  transform: scale(1.02);
}

.hero-image-caption {
  padding: 1rem 1.25rem;
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.caption-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.caption-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.hero-stat-floating {
  position: absolute;
  top: 1.5rem;
  left: -1.25rem;
  background: #ffffff;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.stat-icon-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-secondary-light);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-val {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
}

.stat-lbl {
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
}

.lead-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  line-height: 1.6;
  text-wrap: balance;
  text-wrap: pretty;
}

.about-p {
  color: var(--color-text-sub);
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.75;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.feature-box {
  padding: 1.25rem;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
}

.feature-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  line-height: 1.5;
}

.about-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.about-gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  height: 200px;
  position: relative;
}

.about-gallery-item:first-child {
  grid-column: span 2;
  height: 230px;
}

.about-gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.about-gallery-item:hover .about-gallery-img {
  transform: scale(1.04);
}

.gallery-tag {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  background: rgba(15, 23, 42, 0.75);
  color: #ffffff;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
}

/* --- Divisions Section --- */
.divisions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.division-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.division-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.division-img-wrapper {
  width: 100%;
  height: 180px;
  overflow: hidden;
  position: relative;
  background-color: #f1f5f9;
}

.division-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

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

.division-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.division-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.division-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.division-subtitle {
  font-size: 0.78125rem;
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.division-desc {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.division-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  border-top: 1px solid var(--color-border);
  padding-top: 0.875rem;
}

.skill-tag {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-sub);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* --- Projects & Missions (History / Timeline) --- */
.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 70px;
  margin-bottom: 2.75rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 19px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #ffffff;
  border: 4px solid var(--color-secondary);
  box-shadow: 0 0 0 4px var(--color-secondary-light);
  z-index: 1;
}

.timeline-item.active .timeline-dot {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-light);
}

.timeline-content {
  background-color: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.timeline-content:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-hover);
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-year {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-secondary);
}

.timeline-tag {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--color-bg-subtle);
  color: var(--color-text-sub);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.timeline-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.65;
  margin-bottom: 1rem;
}

.timeline-media {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}

.timeline-media-img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.timeline-media-img:hover {
  transform: scale(1.03);
}

.news-empty {
  text-align: center;
  color: var(--color-text-sub);
  font-size: 0.95rem;
  padding: 2.5rem 1rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background-color: #ffffff;
}

.news-empty a {
  font-weight: 600;
  text-decoration: underline;
}

/* 拡大表示できる写真のキーボードフォーカス */
[data-preview-img] {
  cursor: pointer;
}

[data-preview-img]:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 3px;
}

/* --- News & Reports --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.news-card {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.news-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.news-category {
  color: var(--color-secondary);
  font-weight: 600;
  background-color: var(--color-secondary-light);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.news-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.news-snippet {
  font-size: 0.9rem;
  color: var(--color-text-sub);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.news-filter {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background-color: #ffffff;
  color: var(--color-text-sub);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

.filter-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.filter-btn.btn-note {
  border-color: #2cb696;
  color: #2cb696;
}

.filter-btn.btn-note:hover {
  background-color: #e6f9f5;
}

.filter-btn.btn-note.active {
  background-color: #2cb696;
  border-color: #2cb696;
  color: #ffffff;
}

.filter-btn.btn-x {
  border-color: #0f1419;
  color: #0f1419;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.filter-btn.btn-x:hover {
  background-color: #f1f5f9;
}

.filter-btn.btn-x.active {
  background-color: #0f1419;
  border-color: #0f1419;
  color: #ffffff;
}

.news-card-img-wrapper {
  width: 100%;
  height: 160px;
  overflow: hidden;
  background-color: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.news-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

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

.news-category.category-note {
  color: #0d9488;
  background-color: #ccfbf1;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.note-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #0d9488;
}

.news-note-banner {
  margin-top: 3rem;
  background: linear-gradient(135deg, #f0fdfa 0%, #e0f2fe 100%);
  border: 1px solid #99f6e4;
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.note-banner-content {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.note-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: #2cb696;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.note-banner-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.2rem;
}

.note-banner-desc {
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

.btn-note-link {
  background-color: #2cb696;
  color: #ffffff;
  border: 1px solid transparent;
}

.btn-note-link:hover {
  background-color: #24977c;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(44, 182, 150, 0.25);
}

.news-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-secondary);
}

.news-link:hover {
  text-decoration: underline;
}

.news-link.link-note {
  color: #0d9488;
}

/* --- X (Twitter) Post Preview Cards & Stream --- */
.news-card.card-x {
  background-color: #ffffff;
  border-color: #e2e8f0;
  display: flex;
  flex-direction: column;
}

.news-card.card-x:hover {
  border-color: #0f1419;
  box-shadow: 0 14px 30px -4px rgba(15, 23, 42, 0.12);
}

.x-card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 0.75rem 1.25rem;
}

.x-card-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  flex-shrink: 0;
  background-color: #ffffff;
}

.x-card-user {
  flex-grow: 1;
  min-width: 0;
}

.x-card-author-line {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  line-height: 1.2;
}

.x-card-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.x-card-badge {
  flex-shrink: 0;
}

.x-card-subline {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

.x-card-handle {
  color: var(--color-text-sub);
}

.x-card-dot {
  color: var(--color-text-muted);
}

.x-card-time {
  color: var(--color-text-muted);
}

.x-card-logo {
  color: #0f1419;
  opacity: 0.75;
  flex-shrink: 0;
  margin-left: auto;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.news-card.card-x:hover .x-card-logo {
  opacity: 1;
  transform: scale(1.08);
}

.x-card-content {
  padding: 0 1.25rem 0.85rem 1.25rem;
  flex-grow: 1;
}

.x-card-text {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-main);
  word-break: break-word;
}

.x-hashtags {
  display: block;
  margin-top: 0.5rem;
  color: var(--color-secondary);
  font-weight: 500;
  font-size: 0.825rem;
  line-height: 1.5;
}

.x-card-media-wrapper {
  width: 100%;
  height: 175px;
  overflow: hidden;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  cursor: pointer;
}

.x-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.news-card.card-x:hover .x-card-img {
  transform: scale(1.04);
}

.x-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid rgba(226, 232, 240, 0.6);
}

.x-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--color-text-muted);
  font-size: 0.775rem;
}

.x-action-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition-fast);
  cursor: default;
}

.x-action-item:hover {
  color: var(--color-secondary);
}

.x-action-item.action-repost:hover {
  color: #10b981;
}

.x-action-item.action-like:hover {
  color: #e11d48;
}

.x-card-link {
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  color: #0f1419;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast);
}

.x-card-link:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

.sns-btn.sns-btn-x {
  background-color: #0f1419;
  color: #ffffff !important;
  border-color: #0f1419;
}

.sns-btn.sns-btn-x:hover {
  background-color: #272c30 !important;
  color: #ffffff !important;
  border-color: #272c30 !important;
  transform: translateY(-2px);
}


/* --- Recruit Section --- */
.recruit-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 3.5rem 3rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.recruit-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.recruit-info h3 {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.recruit-lead {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  margin-bottom: 1.75rem;
  line-height: 1.7;
  text-wrap: balance;
  text-wrap: pretty;
}

.recruit-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-main);
}

.check-icon {
  width: 20px;
  height: 20px;
  color: var(--color-secondary);
  flex-shrink: 0;
  margin-top: 2px;
}

.recruit-box {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.recruit-box-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.recruit-detail-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.recruit-detail-item dt {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.recruit-detail-item dd {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0.15rem;
}

/* Faculty Contribution Grid */
.faculties-container {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.faculties-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.faculty-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.faculty-card {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1rem;
  transition: all var(--transition-fast);
}

.faculty-card:hover {
  border-color: var(--color-secondary);
  background-color: #ffffff;
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.faculty-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-secondary);
  background-color: var(--color-secondary-light);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.faculty-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.faculty-desc {
  font-size: 0.8125rem;
  color: var(--color-text-sub);
  line-height: 1.55;
}

/* --- Sponsor Section --- */
.sponsor-banner {
  background-color: var(--color-bg-subtle);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 3rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.sponsor-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.sponsor-desc {
  font-size: 0.95rem;
  color: var(--color-text-sub);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

/* --- Contact & Access --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

/* 長いメールアドレスでグリッド列が画面幅を超えないようにする */
.contact-grid > * {
  min-width: 0;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background-color: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.contact-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-secondary-light);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.contact-card-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0.2rem;
  overflow-wrap: anywhere;
}

.sns-links-group {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.sns-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.sns-btn:hover {
  background-color: #ffffff;
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  box-shadow: var(--shadow-sm);
}

.contact-form {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  background-color: #ffffff;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px var(--color-secondary-light);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Contact Form Status Notification */
.form-status {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.form-status-success {
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #166534;
}

.form-status-error {
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

.btn-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-right: 6px;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- Footer --- */
.footer {
  position: relative;
  background-color: var(--color-primary);
  color: #94a3b8;
  padding: 4.5rem 0 2rem 0;
  font-size: 0.9375rem;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('../assets/images/earthrise_apollo8.jpg');
  background-size: cover;
  background-position: center 25%;
  opacity: 0.25;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 0;
}

.footer > .container {
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
}

.footer-desc {
  line-height: 1.7;
  color: #94a3b8;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.footer-col-title {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: #94a3b8;
  transition: color var(--transition-fast);
  font-size: 0.875rem;
}

.footer-link:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.copyright {
  color: #94a3b8;
}

/* --- Modal for Image Preview --- */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(5px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(15, 23, 42, 0.6);
  color: #ffffff;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: background var(--transition-fast);
  z-index: 10;
}

.modal-close:hover {
  background: rgba(15, 23, 42, 0.9);
}

.modal-img {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  background-color: #0f172a;
}

.modal-caption {
  padding: 1.25rem 1.5rem;
  background-color: #ffffff;
}

.modal-caption h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.modal-caption p {
  font-size: 0.85rem;
  color: var(--color-text-sub);
}

/* ==========================================================================
   Scroll Reveal / Fade-in Animation System
   ========================================================================== */

/* Base transition for reveal-ready elements */
.reveal-ready .fade-init {
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

/* Hidden state before scrolling into view */
.reveal-ready .fade-init:not(.is-visible) {
  opacity: 0;
  transform: translateY(28px);
  pointer-events: none;
}

/* Direction & transformation variants */
.reveal-ready .fade-init.fade-scale:not(.is-visible) {
  transform: scale(0.92) translateY(20px);
}

.reveal-ready .fade-init.fade-left:not(.is-visible) {
  transform: translateX(-30px);
}

.reveal-ready .fade-init.fade-right:not(.is-visible) {
  transform: translateX(30px);
}

.reveal-ready .fade-init.fade-simple:not(.is-visible) {
  transform: none;
}

/* Staggered transition delays for lists & grids */
.reveal-ready .fade-init.delay-1 { transition-delay: 0.08s; }
.reveal-ready .fade-init.delay-2 { transition-delay: 0.16s; }
.reveal-ready .fade-init.delay-3 { transition-delay: 0.24s; }
.reveal-ready .fade-init.delay-4 { transition-delay: 0.32s; }
.reveal-ready .fade-init.delay-5 { transition-delay: 0.40s; }
.reveal-ready .fade-init.delay-6 { transition-delay: 0.48s; }

/* Custom durations if needed */
.reveal-ready .fade-init.duration-fast {
  transition-duration: 0.45s;
}

.reveal-ready .fade-init.duration-slow {
  transition-duration: 1s;
}

/* Once visible and hovered, prioritize card hover micro-animations */
.reveal-ready .fade-init.is-visible:hover {
  transition: transform var(--transition-normal),
              box-shadow var(--transition-normal),
              border-color var(--transition-normal),
              background-color var(--transition-normal);
}

/* Accessibility: Respect Reduced Motion Preferences */
@media (prefers-reduced-motion: reduce) {
  .reveal-ready .fade-init {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    pointer-events: auto !important;
  }
}

/* ==========================================================================
   Crowdfunding Section & Teaser Styles
   ========================================================================== */

/* Nav Badge */
.nav-link-cf {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-badge-soon {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  font-size: 0.6875rem;
  font-weight: 700;
  color: #ea580c;
  background-color: #fff7ed;
  border: 1px solid rgba(234, 88, 12, 0.25);
  border-radius: var(--radius-full);
  line-height: 1.2;
}

/* Teaser Notification Bar below Hero */
.cf-teaser-bar {
  background: linear-gradient(90deg, #0a2540 0%, #0f3460 50%, #162447 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.85rem 0;
  position: relative;
  z-index: 10;
  box-shadow: 0 4px 15px rgba(10, 37, 64, 0.15);
}

.cf-teaser-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cf-teaser-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.cf-teaser-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #ea580c;
  background-color: #fff7ed;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: #ea580c;
  border-radius: 50%;
  display: inline-block;
  animation: pulse-ring 1.8s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 1; box-shadow: 0 0 0 0 rgba(234, 88, 12, 0.7); }
  70% { transform: scale(1.1); opacity: 0.8; box-shadow: 0 0 0 6px rgba(234, 88, 12, 0); }
  100% { transform: scale(0.9); opacity: 1; box-shadow: 0 0 0 0 rgba(234, 88, 12, 0); }
}

.cf-teaser-text {
  color: #f1f5f9;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.cf-teaser-text strong {
  color: #ffffff;
}

.cf-teaser-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #38bdf8;
  white-space: nowrap;
  transition: all var(--transition-fast);
  padding: 0.35rem 0.85rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-full);
}

.cf-teaser-link:hover {
  color: #ffffff;
  background: rgba(56, 189, 248, 0.25);
  border-color: rgba(56, 189, 248, 0.6);
  transform: translateX(3px);
}