/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
  --main: #002D5B;
  --accent: #16A34A;
  --sub-bg: #F4F7FA;
  --text: #334155;
  --text-sub: #6B7280;
  --white: #FFFFFF;
  --border: #E2E8F0;
  --font: 'Noto Sans JP', sans-serif;
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ========================================
   Layout Utilities
   ======================================== */
.inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}
.inner--wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.inner--narrow {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}
.inner--cta {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   Section Base
   ======================================== */
.section {
  padding: 80px 16px;
}
.section--bg {
  padding: 80px 16px;
  background: var(--sub-bg);
}
.section--dark {
  padding: 80px 16px;
  background: var(--main);
  color: rgba(255,255,255,0.72);
  position: relative;
  overflow: hidden;
}
.section--gradient {
  padding: 80px 16px;
  background: linear-gradient(135deg, #FFFFFF 0%, #F4F7FA 100%);
}
.section--cta-btm { margin-top: 40px;
  padding: 80px 24px;
  background: var(--main);
  color: var(--white);
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: rgba(22,163,74,0.08);
  color: var(--accent);
  margin-bottom: 20px;
}
.section-label--border {
  border: 1px solid rgba(22,163,74,0.2);
}
.section-label svg {
  width: 14px;
  height: 14px;
}
.section-title {
  font-size: 26px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--main);
  letter-spacing: -0.01em;
}
.section-title--white {
  color: var(--white);
}
.section-sub {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.95;
  color: #64748B;
  margin-left: auto;
  margin-right: auto;
}
.accent { color: var(--accent); }

/* ========================================
   Hero / FV
   ======================================== */
.hero-wrapper {
  background: linear-gradient(180deg, #FFFFFF, #F4F7FA);
}
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 96px 24px 32px;
}
.hero-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}
.hero-badge { text-align: left !important;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: rgba(22,163,74,0.08);
  color: var(--accent);
  border: 1px solid rgba(22,163,74,0.2);
  margin-bottom: 24px;
}
.hero-badge svg {
  width: 14px;
  height: 14px;
}
.hero-title { text-align: left !important;
  font-size: 40px;
  font-weight: 900;
  line-height: 1.45;
  color: var(--main);
  letter-spacing: -0.02em;
  max-width: 720px;
}
.hero-desc { text-align: left !important;
  margin-top: 24px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-sub);
  max-width: 680px;
}
.hero-cta { text-align: left !important;
  margin-top: 32px;
}
.hero-cta svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}
.hero-cta a {
  display: inline-block;
  transition: transform 0.3s;
}
.hero-cta a:hover {
  transform: translateY(-4px) scale(1.02);
}
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  overflow: visible;
}
.hero-visual > div {
  width: 100%;
}
.hero-visual svg {
  width: 100%;
  height: auto;
}

/* ========================================
   CTA Button (SVG-based, matches top page)
   ======================================== */
.cta-btn-wrap {
  display: inline-block;
  transition: transform 0.3s;
}
.cta-btn-wrap:hover {
  transform: translateY(-4px) scale(1.02);
}

/* ========================================
   Challenges Section
   ======================================== */
.challenges-grid {
  display: grid;
  gap: 24px;
}
.challenge-card {
  background: var(--white);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 2px 16px rgba(0,45,91,0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}
.challenge-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,45,91,0.12);
}
.challenge-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #002D5B, #16A34A);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1);
}
.challenge-card:hover::after {
  transform: scaleX(1);
}
.challenge-card__header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}
.challenge-card__num {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 900;
  color: var(--accent);
  background: rgba(22,163,74,0.08);
  flex-shrink: 0;
}
.challenge-card__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--main);
}
.challenge-card__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-sub);
}

/* ========================================
   Solution Section
   ======================================== */
.solution-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 56px;
}
.solution-header__title-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 32px;
}
.solution-header__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  background: rgba(22,163,74,0.08);
  padding: 4px 16px 4px 4px;
  border-radius: 9999px;
  border: 1px solid rgba(22,163,74,0.15);
}
.solution-header__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 900;
  color: var(--white);
  background: linear-gradient(135deg, #002D5B, #16A34A);
}
.solution-header__num--dark {
  background: rgba(22,163,74,0.2);
  color: var(--accent);
}
.solution-header__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.solution-header__title {
  font-size: 28px;
  font-weight: 900;
  line-height: 1.5;
  color: var(--main);
  margin: 0;
}
.solution-header__title--white {
  color: var(--white);
}
.solution-header__desc-box {
  background: var(--white);
  border: 1px solid #E2E8F0;
  border-radius: 16px;
  padding: 32px 48px;
  width: 100%;
  max-width: 880px;
  box-shadow: 0 4px 20px rgba(0, 45, 91, 0.04);
  text-align: center;
  box-sizing: border-box;
}
.solution-header__desc-box--dark {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.solution-header__desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-sub);
  margin: 0;
}
.solution-header__desc strong {
  color: var(--main);
  font-weight: 700;
  background: linear-gradient(transparent 60%, rgba(22,163,74,0.2) 60%);
}
.solution-header__desc--dark {
  color: rgba(255,255,255,0.7);
}
.solution-header__desc--dark strong {
  color: var(--white);
  background: linear-gradient(transparent 60%, rgba(22,163,74,0.3) 60%);
}

/* Solution SVG Container */
.solution-svg {
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 48px;
  border: 1px solid var(--border);
}
.solution-svg--light {
  background: var(--sub-bg);
}
.solution-svg--white {
  background: var(--white);
}
.solution-svg--dark {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
}
.solution-svg svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Solution Bottom Grid */
.solution-bottom {
  display: grid;
  gap: 24px;
}
.solution-card {
  border-radius: 20px;
  padding: 32px;
  background: var(--white);
  box-shadow: 0 2px 16px rgba(0,45,91,0.06);
  border: 1px solid var(--border);
}
.solution-card--dark {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
  box-shadow: none;
}
.solution-card--center {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.solution-card__badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.solution-card__badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: rgba(22,163,74,0.08);
  color: var(--accent);
}
.solution-card__company {
  font-size: 15px;
  font-weight: 700;
  color: var(--main);
}
.solution-card__company--white {
  color: var(--white);
}
.solution-card__text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-sub);
  margin-bottom: 20px;
}
.solution-card__text--dark {
  color: rgba(255,255,255,0.75);
}
.solution-card__text strong {
  font-weight: 700;
  color: var(--main);
}
.solution-card__text--dark strong {
  color: var(--white);
}
.solution-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  transition: color 0.2s;
}
.solution-card__link:hover {
  color: var(--main);
}
.solution-card__link svg {
  width: 14px;
  height: 14px;
}
.solution-card__link--muted {
  color: rgba(255,255,255,0.6);
}
.solution-card__product-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--main);
  margin-bottom: 20px;
}
.solution-card__product-title--white {
  color: var(--white);
}
.solution-card__products {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.product-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--main);
  background: var(--sub-bg);
  border: 1.5px solid var(--border);
  transition: all 0.2s;
}
.product-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.product-link--dark {
  color: var(--white);
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.12);
}
.product-link--dark:hover {
  border-color: var(--accent);
  background: rgba(22,163,74,0.1);
}
.product-link--purple:hover {
  border-color: #6366F1;
  color: #6366F1;
}
.product-link--purple-dark:hover {
  border-color: #818CF8;
  background: rgba(99,102,241,0.1);
}
.product-link--amber:hover {
  border-color: #F59E0B;
  color: #F59E0B;
}
.product-link__icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.product-link__icon--accent {
  background: rgba(22,163,74,0.1);
}
.product-link__icon--purple {
  background: rgba(99,102,241,0.1);
}
.product-link__icon--amber {
  background: rgba(245,158,11,0.1);
}
.product-link__icon--accent-dark {
  background: rgba(22,163,74,0.15);
}
.product-link__icon--purple-dark {
  background: rgba(99,102,241,0.15);
}
.product-link__icon svg {
  width: 16px;
  height: 16px;
}
.product-link__arrow {
  width: 14px;
  height: 14px;
  margin-left: auto;
  flex-shrink: 0;
}

/* ========================================
   Cross-link Cards (S7)
   ======================================== */
.crosslink-grid {
  display: grid;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.crosslink-card {
  display: block;
  border-radius: 20px;
  padding: 32px;
  background: var(--white);
  box-shadow: 0 2px 16px rgba(0,45,91,0.06);
  border: 1.5px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.crosslink-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,45,91,0.12);
  border-color: var(--accent);
}
.crosslink-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.crosslink-card__icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(22,163,74,0.08);
}
.crosslink-card__icon svg {
  width: 20px;
  height: 20px;
}
.crosslink-card__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.crosslink-card__title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--main);
  margin-bottom: 8px;
}
.crosslink-card__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-sub);
}
.crosslink-card__link {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}
.crosslink-card__link svg {
  width: 14px;
  height: 14px;
}

/* ========================================
   Bottom CTA Section
   ======================================== */
.cta-btm__title {
  font-size: 28px;
  font-weight: 900;
  line-height: 1.35;
  color: var(--main);
  margin-bottom: 20px;
}
.cta-btm__sub {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-sub);
  margin-bottom: 40px;
}
.cta-btm__buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  margin-bottom: 32px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  background: var(--accent);
  border: none;
  transition: background 0.2s;
}
.btn-primary:hover {
  background: var(--main);
}
.btn-primary svg {
  width: 16px;
  height: 16px;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--main);
  background: transparent;
  border: 1.5px solid var(--main);
  transition: all 0.2s;
}
.btn-outline:hover {
  background: var(--main);
  color: var(--white);
}
.cta-btm__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
}
.cta-btm__link {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-sub);
  transition: color 0.2s;
}
.cta-btm__link:hover {
  color: var(--accent);
}
.cta-btm__note {
  font-size: 12px;
  color: var(--text-sub);
}

/* ========================================
   Animations
   ======================================== */
.floating {
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.22,1,0.36,1), transform 0.65s cubic-bezier(0.22,1,0.36,1);
  will-change: opacity, transform;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.stagger-1 { transition-delay: 0.08s; }
.stagger-2 { transition-delay: 0.16s; }
.stagger-3 { transition-delay: 0.24s; }
.stagger-4 { transition-delay: 0.32s; }

/* ========================================
   Dark background decoration
   ======================================== */
.dark-glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.dark-glow--tr {
  top: 0;
  right: 0;
  width: 500px;
  height: 500px;
  opacity: 0.1;
  background: radial-gradient(circle, #16A34A, transparent 70%);
  transform: translate(30%, -30%);
}
.dark-glow--bl {
  bottom: 0;
  left: 0;
  width: 400px;
  height: 400px;
  opacity: 0.05;
  background: radial-gradient(circle, #16A34A, transparent 70%);
  transform: translate(-30%, 30%);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-list { max-width: 880px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid #E2E8F0; }
.faq-item:first-child { border-top: 1px solid #E2E8F0; }
.faq-question {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 24px 0; cursor: pointer; list-style: none;
  font-size: 15px; font-weight: 700; color: var(--main); line-height: 1.6;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::before {
  content: "Q"; flex-shrink: 0; width: 32px; height: 32px;
  border-radius: 50%; background: rgba(22,163,74,0.1);
  color: var(--accent); font-size: 14px; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
}
.faq-question::after {
  content: "+"; flex-shrink: 0; margin-left: auto;
  font-size: 20px; font-weight: 400; color: #94A3B8; transition: transform 0.2s;
}
details[open] .faq-question::after { content: "\2212"; }
.faq-answer { padding: 0 0 24px 48px; font-size: 14px; line-height: 1.85; color: var(--text-sub); }

/* ========================================
   Utility: Visibility
   ======================================== */
.hidden-sm { display: none; }
.hidden { display: none; }

/* ========================================
   Responsive: Tablet (820px+)
   ======================================== */
@media (min-width: 820px) {
  .hero {
    padding: 120px 24px 48px;
  }
  .hero-grid {
    grid-template-columns: 1fr 1.1fr;
  }
  .hero-title { text-align: left !important;
    font-size: 48px;
  }
  .hero-visual {
    overflow: visible;
  }
  .hero-visual > div {
    width: 120%;
    margin-right: -10%;
    margin-left: -10%;
  }
  .section-title {
    font-size: 30px;
  }
  .solution-header__title {
    font-size: 26px;
  }
  .solution-bottom {
    grid-template-columns: 1fr 1fr;
  }
  .challenges-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .crosslink-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cta-btm__buttons {
    flex-direction: row;
    justify-content: center;
  }
  .cta-btm__title {
    font-size: 34px;
  }
  .hidden-sm {
    display: inline;
  }
}

/* ========================================
   Responsive: Desktop (1024px+)
   ======================================== */
@media (min-width: 1024px) {
  .section {
    padding: 112px 32px;
  }
  .section--bg {
    padding: 112px 32px;
  }
  .section--dark {
    padding: 112px 32px;
  }
  .section--gradient {
    padding: 112px 32px;
  }
  .challenges-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Responsive: Mobile CTA and Hero adjustments
   ======================================== */
@media (max-width: 819px) {
  .solution-header__title { font-size: 22px; }
  .solution-header__desc-box { padding: 24px; }
  .solution-header__desc { text-align: left; }
  .hero-title { text-align: left !important;
    font-size: 40px;
  }
  .hero-cta { text-align: left !important;
    text-align: center !important;
  }
  .hero-cta svg {
    width: 100%;
    max-width: 340px;
    height: auto;
  }
  .cta-btn-wrap svg {
    width: 100%;
    max-width: 340px;
    height: auto;
  }
}

/* ========================================
   Responsive: Small (480px and below)
   ======================================== */
@media (max-width: 480px) {
  .hero-title { text-align: left !important;
    font-size: 35px;
  }
  .hero-desc { text-align: left !important;
    font-size: 18px;
  }
  .section-title {
    font-size: 22px;
  }
  .solution-header__title {
    font-size: 20px;
  }
  .cta-btm__title {
    font-size: 24px;
  }
  .product-link {
    padding: 10px 12px;
    font-size: 12px;
    gap: 8px;
  }
  .product-link__icon {
    width: 28px;
    height: 28px;
  }
  .solution-card__products {
    grid-template-columns: 1fr;
  }
  .crosslink-card {
    padding: 24px;
  }
}

/* ========================================
   Responsive: SVG overflow handling
   ======================================== */
@media (min-width: 820px) {
  .solution-svg {
    overflow: hidden;
  }
  .solution-svg svg {
  }
}

/* Focus visible for accessibility */
a:focus-visible,
button:focus-visible,
details summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}