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

:root {
  --navy:  #0a1628;
  --navy2: #0d1f3c;
  --dark:  #060e1a;
  --cyan:  #00d4ff;
  --cyan2: #0099cc;
  --blue:  #1e4db7;
  --white: #ffffff;
  --gray:  #f5f7fa;
  --gray2: #8a9bb0;
  --text:  #1a2a3a;
  --text2: #4a5568;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text);
  background: #fff;
}

/* ── ナビ ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10,22,40,0.95);
  backdrop-filter: blur(12px);
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0,212,255,0.15);
}
.nav-logo {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 1px;
}
.nav-logo span { color: var(--cyan); }
.nav-cta {
  background: var(--cyan);
  color: var(--navy);
  font-size: 12px;
  font-weight: 700;
  padding: 8px 20px;
  border: none;
  cursor: pointer;
  letter-spacing: 0.5px;
  text-decoration: none;
  transition: opacity 0.2s;
}
.nav-cta:hover { opacity: 0.85; }

/* ── ヒーロー ── */
.hero {
  background: var(--navy);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 80px 40px 80px;
}
.hero-svg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(36px, 4vw, 56px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.25;
  margin-bottom: 8px;
}
.hero-title .accent { color: var(--cyan); }
.hero-sub {
  font-size: 16px;
  color: var(--gray2);
  line-height: 1.7;
  margin-bottom: 36px;
  font-weight: 300;
}
.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--cyan);
  color: var(--navy);
  font-size: 14px;
  font-weight: 700;
  padding: 14px 32px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.85; }
.btn-outline {
  background: transparent;
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  padding: 13px 32px;
  border: 1px solid rgba(255,255,255,0.3);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: border-color 0.2s;
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }

.hero-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hero-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.15);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color 0.2s;
}
.hero-card:hover { border-color: rgba(0,212,255,0.4); }
.hero-card-icon {
  font-size: 24px;
  min-width: 36px;
}
.hero-card-text {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.6;
}
.hero-card-text strong {
  color: var(--white);
  display: block;
  font-size: 14px;
  margin-bottom: 2px;
}

/* ── セクション共通 ── */
section { padding: 96px 40px; }
.container { max-width: 1100px; margin: 0 auto; }
.section-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--cyan2);
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  text-align: center;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 15px;
  color: var(--text2);
  text-align: center;
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto 56px;
}
.accent-line {
  width: 48px; height: 3px;
  background: var(--cyan);
  margin: 16px auto 48px;
}

/* ── 課題セクション ── */
.challenge { background: var(--gray); }
.challenge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.challenge-card {
  background: var(--white);
  padding: 32px 28px;
  border-radius: 2px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
  border-top: 3px solid var(--cyan);
}
.challenge-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.4;
}
.challenge-card-body {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
}
.challenge-bottom {
  margin-top: 48px;
  background: var(--navy);
  padding: 28px 40px;
  text-align: center;
}
.challenge-bottom p {
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
}
.challenge-bottom span {
  font-size: 14px;
  color: var(--gray2);
  display: block;
  margin-top: 6px;
}

/* ── ソリューション ── */
.solution { background: var(--white); }
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-bottom: 48px;
}
.stat-box {
  background: var(--navy);
  padding: 40px 24px;
  text-align: center;
}
.stat-box:nth-child(2) { background: var(--navy2); }
.stat-num {
  font-family: 'Inter', sans-serif;
  font-size: 60px;
  font-weight: 900;
  color: var(--cyan);
  line-height: 1;
}
.stat-label {
  font-size: 12px;
  color: var(--gray2);
  margin-top: 10px;
}
.solution-body {
  font-size: 15px;
  color: var(--text2);
  line-height: 1.9;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

/* ── 特長① セキュリティ ── */
.security { background: var(--gray); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.feature-card {
  background: var(--white);
  display: grid;
  grid-template-columns: 64px 1fr;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.feature-num {
  background: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Inter', sans-serif;
  font-size: 22px;
  font-weight: 900;
  color: var(--navy);
}
.feature-body { padding: 20px 20px; }
.feature-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.feature-desc {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.7;
}

/* ── 特長② 業務効率化 ── */
.efficiency { background: var(--white); }
.usage-list {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.usage-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.usage-item.reverse { direction: rtl; }
.usage-item.reverse > * { direction: ltr; }
.usage-img {
  background: var(--navy);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.usage-img-inner {
  font-size: 72px;
  opacity: 0.8;
}
.usage-img-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--navy2) 0%, var(--dark) 100%);
}
.usage-service-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.usage-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.3;
}
.usage-desc {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.8;
  margin-bottom: 20px;
}
.usage-checks {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.usage-check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
}
.usage-check::before {
  content: '';
  width: 18px; height: 18px;
  min-width: 18px;
  background: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2 6l3 3 5-5' stroke='%230a1628' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px;
}

/* ── 活用シーン ── */
.usecases { background: var(--gray); }
.sector-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.sector-card {
  background: var(--white);
  padding: 28px 28px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.sector-icon-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.sector-icon {
  width: 44px; height: 44px;
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  border-left: 3px solid var(--cyan);
}
.sector-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.sector-items {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sector-item {
  font-size: 13px;
  color: var(--text2);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}
.sector-item::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--cyan);
  font-size: 20px;
  line-height: 1;
  top: -1px;
}

/* ── 導入フロー ── */
.flow { background: var(--white); }
.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}
.step-list::before {
  content: '';
  position: absolute;
  left: 40px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
}
.step-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid #eee;
  position: relative;
}
.step-item:last-child { border-bottom: none; }
.step-num-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.step-num {
  width: 44px; height: 44px;
  background: var(--cyan);
  color: var(--navy);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
.step-label-sm {
  font-size: 9px;
  font-family: 'Inter', sans-serif;
  color: var(--gray2);
  letter-spacing: 1px;
}
.step-body {}
.step-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.step-desc {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
}

/* ── FAQ ── */
.faq { background: var(--gray); }
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.faq-q {
  padding: 20px 24px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.5;
}
.faq-q-icon {
  min-width: 28px; height: 28px;
  background: var(--navy);
  color: var(--cyan);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
}
.faq-a {
  padding: 0 24px 20px 66px;
  font-size: 13px;
  color: var(--text2);
  line-height: 1.8;
  display: none;
}
.faq-item.open .faq-a { display: block; }

/* ── CTA ── */
.cta-section {
  background: var(--navy);
  padding: 96px 40px;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-section .hero-svg {
  opacity: 0.5;
}
.cta-inner {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
}
.cta-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.cta-title {
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 12px;
}
.cta-sub {
  font-size: 15px;
  color: var(--gray2);
  margin-bottom: 40px;
  line-height: 1.7;
}
.cta-contacts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-top: 48px;
}
.cta-contact {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.15);
  padding: 24px 20px;
  text-align: center;
}
.cta-contact-icon { font-size: 24px; margin-bottom: 8px; }
.cta-contact-label {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.cta-contact-value {
  font-size: 14px;
  color: var(--white);
  font-weight: 600;
}

/* ── フッター ── */
footer {
  background: var(--dark);
  padding: 24px 40px;
  text-align: center;
  font-size: 11px;
  color: #2a3a5a;
  letter-spacing: 1px;
  font-family: 'Inter', sans-serif;
}

/* ── レスポンシブ ── */
@media (max-width: 768px) {
  section { padding: 64px 20px; }
  nav { padding: 0 20px; }
  .hero { padding: 100px 20px 60px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-cards { display: none; }
  .challenge-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .usage-item { grid-template-columns: 1fr; gap: 24px; }
  .usage-item.reverse { direction: ltr; }
  .sector-grid { grid-template-columns: 1fr; }
  .cta-contacts { grid-template-columns: 1fr; }
}