.page-about {
  --about-pad: clamp(24px, 4vw, 56px);
  background: var(--clr-ice);
}

.page-about .breadcrumbs {
  padding: 18px 0 0;
  margin: 0;
}

.page-about .breadcrumbs__list {
  padding: 0;
  margin: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.page-about .breadcrumbs__link {
  color: rgba(232, 239, 247, 0.6);
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

.page-about .breadcrumbs__link:hover {
  color: var(--clr-gold-pale);
}

.page-about .breadcrumbs__current {
  color: var(--clr-gold);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: '›';
  color: rgba(232, 239, 247, 0.35);
  margin-right: 6px;
}

.page-about .folio,
.page-about__folio {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--clr-gold);
  border-bottom: 1px solid rgba(201, 160, 99, 0.24);
  padding-bottom: 10px;
  margin-bottom: 28px;
}

.page-about__folio::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(201, 160, 99, 0.4), transparent);
}

.page-about__hero {
  position: relative;
  background:
    radial-gradient(ellipse at 85% 20%, rgba(30, 73, 110, 0.55) 0%, transparent 60%),
    linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-soft) 100%);
  padding: 0 0 60px;
  overflow: hidden;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(201, 160, 99, 0.2);
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 40px;
}

.page-about__hero-copy .kicker {
  color: var(--clr-gold);
  letter-spacing: 0.2em;
}

.page-about__hero h1 {
  font-family: var(--font-head);
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--clr-white);
  margin: 8px 0 8px;
  line-height: 1.15;
}

.page-about__hero-subtitle {
  font-family: var(--font-head);
  font-size: 15px;
  color: var(--clr-gold-pale);
  letter-spacing: 0.18em;
  margin: 0 0 20px;
}

.page-about__hero-text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 239, 247, 0.78);
  max-width: 60ch;
  margin: 0 0 28px;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  gap: 14px;
}

.page-about__hero-actions .btn {
  width: 100%;
  text-align: center;
}

.page-about__hero-badge {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background:
    linear-gradient(145deg, rgba(201, 160, 99, 0.22), rgba(201, 160, 99, 0.04) 60%),
    var(--clr-primary-soft);
  border: 1px solid rgba(201, 160, 99, 0.45);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  margin: 0 auto;
  box-shadow: 0 18px 42px rgba(10, 30, 59, 0.45);
}

.page-about__hero-badge::before {
  content: '';
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  border: 1px dashed rgba(201, 160, 99, 0.28);
}

.page-about__hero-badge-year {
  font-family: var(--font-head);
  font-size: 36px;
  font-weight: 700;
  color: var(--clr-gold);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about__hero-badge-label {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(232, 239, 247, 0.62);
  margin-top: 6px;
}

.page-about__hero-badge-version {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-gold-pale);
  background: rgba(201, 160, 99, 0.15);
  border-radius: 999px;
  padding: 4px 14px;
  margin-top: 10px;
}

.page-about__mission {
  background: var(--clr-ice);
}

.page-about__mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about__mission-copy h2 {
  font-family: var(--font-head);
  font-size: 24px;
  line-height: 1.35;
  color: var(--clr-primary);
  margin: 8px 0 18px;
  letter-spacing: 0.01em;
}

.page-about__mission-copy > p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: #33465B;
  margin-bottom: 16px;
  max-width: 60ch;
}

.page-about__steps {
  margin-top: 28px;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about__steps .step {
  position: relative;
  padding: 14px 0 14px 56px;
  counter-increment: about-step;
  border-bottom: 1px solid rgba(10, 30, 59, 0.08);
}

.page-about__steps .step:last-child {
  border-bottom: 0;
}

.page-about__steps .step::before {
  content: counter(about-step);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--clr-primary);
  color: var(--clr-gold-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
}

.page-about__steps .step__title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--clr-primary);
  margin: 0 0 4px;
}

.page-about__steps .step__desc {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(10, 30, 59, 0.62);
  margin: 0;
}

.page-about__mission-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 8px;
}

.page-about__mission-note {
  background: var(--clr-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px 22px;
  position: relative;
  border-left: 3px solid var(--clr-gold);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.65;
  color: rgba(10, 30, 59, 0.72);
}

.page-about__mission-note p {
  margin: 0;
}

.page-about__mission-note-mark {
  font-family: var(--font-head);
  color: var(--clr-gold);
  font-size: 20px;
  margin-right: 8px;
}

.page-about__milestones {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(30, 73, 110, 0.4) 0%, transparent 55%),
    linear-gradient(160deg, var(--clr-primary) 0%, #0d2a4d 100%);
}

.page-about__milestones-head {
  max-width: 720px;
  margin-bottom: 24px;
}

.page-about__milestones-head h2 {
  font-family: var(--font-head);
  font-size: 26px;
  line-height: 1.25;
  color: var(--clr-white);
  margin: 0 0 14px;
  letter-spacing: 0.02em;
}

.page-about__milestones-intro {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.7);
  margin: 0;
}

.page-about__timeline-banner {
  margin: 0 0 32px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(201, 160, 99, 0.25);
}

.page-about__timeline-banner-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__timeline {
  position: relative;
  padding-left: 24px;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-gold) 0%, rgba(201, 160, 99, 0.15) 100%);
  opacity: 0.5;
}

.page-about__timeline .timeline__item {
  margin-bottom: 0;
}

.page-about__milestone {
  position: relative;
  margin-bottom: 12px;
  border-radius: 12px;
  background: rgba(19, 46, 74, 0.6);
  border: 1px solid rgba(201, 160, 99, 0.18);
  transition: border-color var(--transition);
}

.page-about__milestone[open] {
  border-color: rgba(201, 160, 99, 0.5);
}

.page-about__milestone::before {
  content: '';
  position: absolute;
  left: -23px;
  top: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-gold);
  box-shadow: 0 0 0 3px rgba(10, 30, 59, 0.7), 0 0 0 5px rgba(201, 160, 99, 0.25);
}

.page-about__milestone-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 16px 22px;
  user-select: none;
}

.page-about__milestone-summary::-webkit-details-marker {
  display: none;
}

.page-about__milestone-summary::after {
  content: '+';
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 400;
  color: var(--clr-gold);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.page-about__milestone[open] .page-about__milestone-summary::after {
  transform: rotate(45deg);
}

.page-about__milestone-year {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--clr-gold);
  letter-spacing: 0.06em;
  min-width: 48px;
}

.page-about__milestone-title {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--clr-white);
  letter-spacing: 0.02em;
}

.page-about__milestone-tag {
  font-family: var(--font-head);
  font-size: 12px;
  color: rgba(232, 239, 247, 0.52);
  background: rgba(201, 160, 99, 0.12);
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  margin-left: auto;
}

.page-about__milestone-detail {
  padding: 0 22px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.72);
  border-top: 1px dashed rgba(201, 160, 99, 0.18);
}

.page-about__milestone-detail p {
  margin: 12px 0 0;
}

.page-about__services {
  background: var(--clr-ice);
}

.page-about__services-head {
  max-width: 640px;
  margin-bottom: 32px;
}

.page-about__services-head h2 {
  font-family: var(--font-head);
  font-size: 26px;
  line-height: 1.3;
  color: var(--clr-primary);
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}

.page-about__services-head p:not(.kicker) {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: #33465B;
  margin: 0;
}

.page-about__services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: stretch;
}

.page-about__service-card {
  position: relative;
  padding: 28px 24px;
  margin: 0;
  overflow: hidden;
}

.page-about__service-card--wide {
  padding: 32px 24px;
}

.page-about__service-num {
  position: absolute;
  top: 12px;
  right: 16px;
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  opacity: 0.12;
  color: var(--clr-gold);
}

.page-about__service-card--wide .page-about__service-num {
  font-size: 56px;
  opacity: 0.14;
}

.page-about__service-card h3 {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 10px;
}

.page-about__service-card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
  max-width: 46ch;
}

.panel--dark.page-about__service-card h3 {
  color: var(--clr-white);
}

.panel--dark.page-about__service-card p {
  color: rgba(232, 239, 247, 0.68);
}

.panel--organic.page-about__service-card h3 {
  color: var(--clr-primary);
}

.panel--organic.page-about__service-card p {
  color: #33465B;
}

.page-about__principles {
  background: var(--clr-primary-soft);
}

.page-about__principles-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 32px;
}

.page-about__principles-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-organic);
  border: 1px solid rgba(201, 160, 99, 0.3);
  box-shadow: var(--shadow-deep);
}

.page-about__principles-head h2 {
  font-family: var(--font-head);
  font-size: 26px;
  line-height: 1.3;
  color: var(--clr-white);
  margin: 0 0 14px;
  letter-spacing: 0.02em;
}

.page-about__principles-head p:not(.kicker) {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.7);
  margin: 0;
}

.page-about__principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about__principle {
  background: rgba(10, 30, 59, 0.5);
  border: 1px solid rgba(201, 160, 99, 0.18);
  border-radius: var(--radius-card);
  padding: 26px 22px;
  position: relative;
  transition: transform var(--transition), border-color var(--transition);
}

.page-about__principle:hover {
  transform: translateY(-4px);
  border-color: rgba(201, 160, 99, 0.4);
}

.page-about__principle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 22px;
  right: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-gold), transparent 80%);
}

.page-about__principle-index {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--clr-gold);
  letter-spacing: 0.12em;
}

.page-about__principle h3 {
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--clr-white);
  margin: 8px 0 12px;
}

.page-about__principle p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.66);
  margin: 0;
}

.page-about__principles-note {
  margin-top: 28px;
  padding: 16px 20px;
  background: rgba(201, 160, 99, 0.08);
  border-left: 3px solid var(--clr-gold);
  border-radius: 0 10px 10px 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 231, 193, 0.85);
}

.page-about__principles-note::before {
  content: '重要 · ';
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--clr-gold);
}

.page-about__stats {
  background: linear-gradient(120deg, rgba(201, 160, 99, 0.92), rgba(245, 231, 193, 0.96));
  padding: 44px 0;
  overflow: hidden;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 16px;
  text-align: center;
}

.page-about__stat {
  position: relative;
}

.page-about__stat-num {
  font-family: var(--font-head);
  font-size: 36px;
  font-weight: 800;
  color: var(--clr-primary);
  letter-spacing: -0.02em;
  display: block;
  line-height: 1.1;
}

.page-about__stat-label {
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: rgba(10, 30, 59, 0.6);
  margin-top: 8px;
  display: block;
}

.page-about__cta {
  background: var(--clr-primary);
  position: relative;
  overflow: hidden;
}

.page-about__cta::before {
  content: '';
  position: absolute;
  right: -160px;
  top: -160px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  border: 1px solid rgba(201, 160, 99, 0.18);
  pointer-events: none;
}

.page-about__cta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about__cta-copy .kicker {
  color: var(--clr-gold);
}

.page-about__cta-copy h2 {
  font-family: var(--font-head);
  font-size: 26px;
  line-height: 1.3;
  color: var(--clr-white);
  margin: 8px 0 16px;
}

.page-about__cta-copy p:not(.kicker) {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 239, 247, 0.68);
  margin-bottom: 24px;
  max-width: 52ch;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  gap: 14px;
}

.page-about__cta-actions .btn {
  width: 100%;
  text-align: center;
}

.page-about__cta-img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  border-radius: var(--radius-organic);
  border: 1px solid rgba(201, 160, 99, 0.28);
  box-shadow: var(--shadow-deep);
  margin: 0 auto;
}

@media (max-width: 480px) {
  .page-about__milestone-tag {
    width: 100%;
    margin-left: 0;
  }

  .page-about__hero {
    padding-bottom: 48px;
  }

  .page-about__hero-badge {
    width: 150px;
    height: 150px;
  }

  .page-about__hero-badge-year {
    font-size: 30px;
  }

  .page-about__stat-num {
    font-size: 30px;
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 0 0 88px;
  }

  .page-about__hero-inner {
    grid-template-columns: 1fr 280px;
    gap: 48px;
    margin-top: 48px;
  }

  .page-about__hero h1 {
    font-size: 44px;
  }

  .page-about__hero-subtitle {
    font-size: 16px;
  }

  .page-about__hero-text {
    font-size: 16px;
  }

  .page-about__hero-actions {
    flex-direction: row;
  }

  .page-about__hero-actions .btn {
    width: auto;
    text-align: left;
  }

  .page-about__hero-badge {
    margin: 0 0 0 auto;
    width: 220px;
    height: 220px;
  }

  .page-about__hero-badge-year {
    font-size: 44px;
  }

  .page-about__hero-badge-label {
    font-size: 13px;
  }

  .page-about__hero-badge-version {
    font-size: 16px;
  }

  .page-about__mission-grid {
    grid-template-columns: 1.6fr 1fr;
    gap: 48px;
  }

  .page-about__mission-copy h2 {
    font-size: 32px;
  }

  .page-about__mission-side {
    margin-top: 72px;
  }

  .page-about__milestones-head h2,
  .page-about__services-head h2,
  .page-about__principles-head h2,
  .page-about__cta-copy h2 {
    font-size: 36px;
  }

  .page-about__services-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 24px;
  }

  .page-about__service-card {
    padding: 32px 28px;
  }

  .page-about__service-card--wide {
    padding: 44px 36px;
  }

  .page-about__principles-top {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 40px;
  }

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

  .page-about__stats {
    padding: 52px 0;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about__stat:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: rgba(10, 30, 59, 0.14);
  }

  .page-about__stat-num {
    font-size: 44px;
  }

  .page-about__cta-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
  }

  .page-about__cta-actions {
    flex-direction: row;
  }

  .page-about__cta-actions .btn {
    width: auto;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .page-about__hero h1 {
    font-size: clamp(36px, 5vw, 64px);
  }

  .page-about__milestone-summary {
    padding: 18px 24px;
  }

  .page-about__milestone-detail {
    padding: 0 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__principle {
    transition: none;
  }

  .page-about__milestone-summary::after {
    transition: none;
  }
}