/* ============================================================
   トップページ専用スタイル
   ============================================================ */

/* ---------- Hero ---------- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(8, 45, 68, 0.72) 0%,
    rgba(13, 84, 120, 0.52) 60%,
    rgba(8, 45, 68, 0.38) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 7.2rem;
}
.hero-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-en);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 2rem;
}
.hero-label-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}
.hero-title {
  font-family: var(--font-ja);
  font-size: clamp(3.6rem, 5.5vw, 6.4rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--white);
  margin-bottom: 2.4rem;
  letter-spacing: -0.01em;
}
.hero-title-accent {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(1.4rem, 1.8vw, 1.7rem);
  color: rgba(255,255,255,0.8);
  line-height: 1.9;
  margin-bottom: 3.6rem;
  max-width: 52rem;
}
.hero-btns {
  display: flex;
  gap: 1.6rem;
  flex-wrap: wrap;
}
.hero-vert-label {
  position: absolute;
  right: 3.2rem;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center;
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.2);
  white-space: nowrap;
  z-index: 1;
}
@media (max-width: 768px) {
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { justify-content: center; }
  .hero-vert-label { display: none; }
}

/* ---------- Milestone ---------- */
.milestone {
  background:
    /* 右上の柔らかい光 */
    radial-gradient(ellipse 70% 60% at 85% 10%, rgba(41,182,232,0.22) 0%, transparent 65%),
    /* 左下のシアン光 */
    radial-gradient(ellipse 50% 50% at 10% 90%, rgba(46,196,224,0.14) 0%, transparent 60%),
    /* ベース：深いネイビー→ティール系グラデ */
    linear-gradient(145deg, #082d44 0%, #0d5478 55%, #0a3d5c 100%);
  overflow: hidden;
  position: relative;
}
.milestone::before {
  content: '';
  position: absolute;
  inset: 0;
  /* 波紋状の同心円（SVGインライン） */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='600' height='600'%3E%3Ccircle cx='300' cy='300' r='80' fill='none' stroke='rgba(77,212,236,0.07)' stroke-width='1'/%3E%3Ccircle cx='300' cy='300' r='150' fill='none' stroke='rgba(77,212,236,0.05)' stroke-width='1'/%3E%3Ccircle cx='300' cy='300' r='220' fill='none' stroke='rgba(77,212,236,0.04)' stroke-width='1'/%3E%3Ccircle cx='300' cy='300' r='290' fill='none' stroke='rgba(77,212,236,0.03)' stroke-width='1'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  z-index: 0;
  pointer-events: none;
}
.milestone-track {
  display: flex;
  align-items: stretch;
  gap: 0;
  position: relative;
  z-index: 3;
}
.milestone-item {
  flex: 1;
  padding: 4rem;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(8px);
}
.milestone-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 2.4rem;
  gap: 0.8rem;
  color: var(--teal);
}
.milestone-line {
  width: 1px;
  flex: 1;
  background: linear-gradient(to bottom, transparent, var(--teal), transparent);
}
.milestone-arrow {
  font-family: var(--font-en);
  font-size: 2rem;
  color: var(--teal);
}
@media (max-width: 768px) { .milestone-arrow { display: none; } }
.milestone-year {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 1.6rem;
}
.milestone-num {
  font-family: var(--font-en);
  font-size: 4.8rem;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.milestone-unit {
  font-size: 1.4rem;
  color: rgba(255,255,255,0.5);
}
.milestone-badge {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  border-radius: 100vw;
  font-size: 1.2rem;
  font-weight: 500;
  background: rgba(41,182,232,0.22);
  color: var(--teal);
  border: 1px solid rgba(77,212,236,0.40);
  margin-bottom: 1.2rem;
}
.milestone-badge-teal {
  background: rgba(77,212,236,0.20);
  color: var(--green);
  border-color: rgba(160,237,216,0.40);
}
.milestone-text {
  font-size: 1.4rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
}
@media (max-width: 768px) {
  .milestone-track {
    flex-direction: column;
    gap: 1.6rem;
  }
  .milestone-divider {
    flex-direction: row;
    padding: 0;
  }
  .milestone-line {
    width: 100%;
    height: 1px;
    flex: 1;
    background: linear-gradient(to right, transparent, var(--teal), transparent);
  }
  .milestone-item { padding: 2.4rem; }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8rem;
  align-items: center;
}
.about-body {
  font-size: 1.6rem;
  color: var(--text-sub);
  line-height: 2;
}
.about-link {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 3.2rem;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
  padding-bottom: 0.4rem;
  transition: gap var(--transition), color var(--transition);
}
.about-link:hover { gap: 1.4rem; color: var(--teal); border-color: var(--teal); }
.about-link::after { content: '→'; font-family: var(--font-en); }
.about-stats {
  display: flex;
  gap: 3.2rem;
  margin-bottom: 3.2rem;
}
.about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.about-stat-label {
  font-size: 1.3rem;
  color: var(--text-sub);
}
.about-collage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1.2rem;
  height: 36rem;
}
.about-collage--single {
  display: block;
  height: 36rem;
}
.about-collage--single .about-collage-item {
  height: 100%;
}
.about-collage-main {
  grid-row: 1 / 3;
}
.about-collage-sub {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  height: 100%;
}
.about-collage-sub .about-collage-item {
  flex: 1;
}
.about-collage-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
}
.collage-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  font-family: var(--font-ja);
  font-size: 1.3rem;
  font-weight: 500;
  min-height: 12rem;
}
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  .about-collage { height: 28rem; }
}

/* ---------- Topics ---------- */
.topics-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 3.2rem;
  gap: 2rem;
  flex-wrap: wrap;
}
/* TOPページ topics リスト形式 */
.topics-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.topic-list-item {
  display: flex;
  align-items: center;
  gap: 2.4rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: background var(--transition);
}
.topic-list-item:first-child {
  border-top: 1px solid var(--border);
}
.topic-list-item:hover {
  background: rgba(5,115,202,0.03);
}
.topic-list-thumb {
  width: 14rem;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
}
.topic-list-thumb-inner {
  width: 100%;
  height: 100%;
}
.topic-list-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  min-width: 0;
}
.topic-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.topic-list-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.7;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.topic-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  background: var(--blue);
  letter-spacing: 0.08em;
  padding: 0.6rem 1.4rem;
  border-radius: 10rem;
  text-transform: uppercase;
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}
.topic-card-link::after {
  content: '→';
  font-family: var(--font-en);
  font-size: 1.1rem;
  transition: transform var(--transition);
}
.topic-list-item:hover .topic-card-link {
  background: var(--teal);
}
.topic-list-item:hover .topic-card-link::after {
  transform: translateX(3px);
}
@media (max-width: 768px) {
  .topic-list-thumb {
    width: 9rem;
  }
  .topic-list-title {
    font-size: 1.4rem;
  }
  .topic-card-link {
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
  }
}
.topic-date {
  font-family: var(--font-en);
  font-size: 1.2rem;
  color: var(--text-sub);
}

/* ---------- Service ---------- */
.service-header {
  margin-bottom: 4.8rem;
}
.service-header-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-top: 1.6rem;
}
.service-desc {
  font-size: 1.5rem;
  color: var(--text-sub);
  line-height: 2;
}
.service-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.4rem;
  margin-bottom: 4rem;
}
.service-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--white);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.service-card-visual {
  position: relative;
  height: 22rem;
  overflow: hidden;
}
.service-card-bg {
  position: absolute;
  inset: 0;
  transition: transform 0.5s ease;
}
.service-card:hover .service-card-bg {
  transform: scale(1.05);
}
.service-card-overlay {
  position: absolute;
  inset: 0;
  padding: 2.4rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: linear-gradient(to top, rgba(8,45,68,0.75) 0%, transparent 60%);
}
.service-card-en {
  font-family: var(--font-en);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: 0.8rem;
}
.service-card-title {
  font-family: var(--font-ja);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}
.service-card-body {
  padding: 2.4rem;
}
.service-card-body p {
  font-size: 1.4rem;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 1.6rem;
}
.service-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--blue);
  transition: gap var(--transition);
}
.service-card-link:hover { gap: 1.2rem; }
.service-card-link::after { content: '→'; font-family: var(--font-en); }
.service-cta {
  text-align: center;
}
@media (max-width: 768px) {
  .service-header-inner { grid-template-columns: 1fr; gap: 2rem; }
  .service-cards { grid-template-columns: 1fr; }
  .service-card-visual { height: 18rem; }
}

/* ---------- CTA Section ---------- */
.cta-section {
  position: relative;
  padding: 10rem 0;
  overflow: hidden;
  isolation: isolate;
}
.cta-bg {
  position: absolute;
  inset: 0;
  /* ベース：深いネイビー→ティール系グラデ */
  background:
    radial-gradient(ellipse 80% 70% at 80% 15%, rgba(41,182,232,0.28) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 15% 85%, rgba(46,196,224,0.18) 0%, transparent 55%),
    linear-gradient(150deg, #082d44 0%, #0e5a80 50%, #082d44 100%);
}
.cta-grad {
  position: absolute;
  inset: 0;
  /* 波紋状の同心円 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='800' height='800'%3E%3Ccircle cx='400' cy='400' r='100' fill='none' stroke='rgba(77,212,236,0.06)' stroke-width='1'/%3E%3Ccircle cx='400' cy='400' r='190' fill='none' stroke='rgba(77,212,236,0.05)' stroke-width='1'/%3E%3Ccircle cx='400' cy='400' r='280' fill='none' stroke='rgba(77,212,236,0.04)' stroke-width='1'/%3E%3Ccircle cx='400' cy='400' r='370' fill='none' stroke='rgba(77,212,236,0.03)' stroke-width='1'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  z-index: 0;
  pointer-events: none;
}
.cta-section .container {
  position: relative;
  z-index: 3;
}
.cta-inner {
  max-width: 72rem;
  margin: 0 auto;
  text-align: left;
}
.cta-title {
  font-family: var(--font-ja);
  font-size: clamp(2.4rem, 3.2vw, 3.6rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 1.6rem;
  text-align: left;
}
.cta-desc {
  font-size: 1.5rem;
  color: rgba(255,255,255,0.80);
  line-height: 1.9;
  margin-bottom: 3.2rem;
  text-align: left;
}