* {
  box-sizing: border-box;
}

:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #14213d;
  --muted: #667085;
  --line: #dbe2ea;
  --primary: #1677ff;
  --primary-2: #00a3ff;
  --dark: #08111f;
  --soft: #eef5ff;
  --radius: 20px;
  --shadow: 0 20px 60px rgba(16, 24, 40, 0.10);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  background: rgba(246, 248, 251, 0.88);
  border-bottom: 1px solid rgba(219, 226, 234, 0.8);
}

.nav-wrap {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand-logo {
  width: 76px;
  height: 50px;
  object-fit: contain;
  flex: 0 0 auto;
}

.brand-text {
  letter-spacing: .02em;
  line-height: 1.25;
  max-width: 250px;
}

.nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 700;
}

.nav a {
  color: #344054;
}

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

.menu-button {
  display: none;
  background: transparent;
  border: 0;
  width: 44px;
  height: 44px;
  padding: 10px;
}

.menu-button span {
  display: block;
  height: 2px;
  background: var(--text);
  margin: 6px 0;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 86px;
  background:
    radial-gradient(circle at 80% 20%, rgba(0,163,255,.14), transparent 26%),
    radial-gradient(circle at 20% 0%, rgba(22,119,255,.11), transparent 25%),
    linear-gradient(180deg, #fbfdff 0%, #f5f8fc 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 72px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .18em;
  font-weight: 900;
  color: var(--primary);
}

.hero h1 {
  margin: 0;
  font-size: clamp(46px, 6vw, 78px);
  line-height: 1.11;
  letter-spacing: -.045em;
}

.hero h1 span {
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 28px 0 0;
  max-width: 650px;
  color: #475467;
  font-size: 18px;
}

.hero-punch {
  margin-top: 26px;
  padding: 20px 22px;
  border: 1px solid rgba(22, 119, 255, .22);
  border-left: 5px solid var(--primary);
  border-radius: 16px;
  background: linear-gradient(90deg, rgba(22,119,255,.08), rgba(0,163,255,.03));
  box-shadow: 0 10px 28px rgba(22, 119, 255, .08);
}

.hero-punch strong {
  display: block;
  margin-bottom: 7px;
  color: #0b4fa8;
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.45;
  font-weight: 900;
}

.hero-punch p {
  margin: 0;
  color: #344054;
  font-size: 13px;
  line-height: 1.8;
  font-weight: 600;
}

.hero-punch b {
  color: var(--primary);
  font-weight: 900;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 34px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  transition: .2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.primary {
  color: #fff;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  box-shadow: 0 12px 26px rgba(22, 119, 255, .22);
}

.secondary {
  background: #fff;
  border: 1px solid var(--line);
}

.hero-badges {
  margin-top: 34px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.hero-badges span {
  background: #fff;
  border: 1px solid #dfe7f1;
  border-radius: 999px;
  padding: 8px 13px;
  font-size: 12px;
  font-weight: 800;
  color: #475467;
}

.hero-visual {
  min-height: 510px;
  position: relative;
  display: grid;
  place-items: center;
}

.radar {
  width: 410px;
  height: 410px;
  border-radius: 50%;
  border: 1px solid rgba(22, 119, 255, .25);
  background:
    radial-gradient(circle, rgba(22,119,255,.08) 0 18%, transparent 18% 37%, rgba(22,119,255,.05) 37% 38%, transparent 38% 60%, rgba(22,119,255,.05) 60% 61%, transparent 61%),
    linear-gradient(rgba(22,119,255,.08), rgba(22,119,255,.08)) center/1px 100% no-repeat,
    linear-gradient(90deg, rgba(22,119,255,.08), rgba(22,119,255,.08)) center/100% 1px no-repeat;
}

.device-card {
  position: absolute;
  z-index: 2;
  width: 230px;
  padding: 28px 24px;
  border-radius: 26px;
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(219,226,234,.9);
  box-shadow: var(--shadow);
  text-align: center;
}

.device-card strong,
.device-card small {
  display: block;
}

.device-card small {
  margin-top: 5px;
  color: var(--muted);
}

.device-icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  color: var(--primary);
  font-size: 38px;
  background: #eaf3ff;
}

.signal-card {
  position: absolute;
  z-index: 3;
  min-width: 130px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid #dbe7f6;
  box-shadow: 0 12px 32px rgba(16,24,40,.09);
}

.signal-card b,
.signal-card span {
  display: block;
}

.signal-card b {
  color: var(--primary);
}

.signal-card span {
  font-size: 11px;
  color: var(--muted);
}

.sig-1 { top: 42px; left: 5px; }
.sig-2 { top: 80px; right: 0; }
.sig-3 { bottom: 58px; right: 8px; }
.sig-4 { bottom: 26px; left: 8px; }

.strip {
  background: var(--dark);
  color: #fff;
}

.stat-grid {
  min-height: 120px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
}

.stat-grid div {
  padding: 20px 30px;
  border-right: 1px solid rgba(255,255,255,.12);
}

.stat-grid div:last-child {
  border-right: 0;
}

.stat-grid strong,
.stat-grid span {
  display: block;
}

.stat-grid strong {
  font-size: 23px;
}

.stat-grid span {
  margin-top: 4px;
  color: #aab6c8;
  font-size: 13px;
}

.section {
  padding: 100px 0;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 46px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.3;
  letter-spacing: -.03em;
}

.section-heading p:last-child {
  color: var(--muted);
  margin-top: 14px;
}

.cards {
  display: grid;
  gap: 20px;
}

.feature-cards {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  padding: 30px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid #e3e8ef;
  box-shadow: 0 10px 30px rgba(16,24,40,.05);
}

.card .icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  margin-bottom: 18px;
  background: #edf5ff;
  color: var(--primary);
  font-weight: 900;
}

.card h3 {
  margin: 0;
  font-size: 19px;
}

.card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.dark-section {
  background:
    radial-gradient(circle at 85% 30%, rgba(0,163,255,.18), transparent 26%),
    var(--dark);
  color: #fff;
}

.section-heading.light p:last-child {
  color: #aeb9ca;
}

.network-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 20px;
}

.flow-card {
  min-height: 240px;
  padding: 30px;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,.13);
  background: rgba(255,255,255,.05);
}

.flow-card .step {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
  color: #67c5ff;
}

.flow-card h3 {
  margin: 22px 0 12px;
  font-size: 27px;
}

.flow-card p {
  color: #b8c2d0;
}

.arrow {
  font-size: 28px;
  color: #5cc2ff;
}

.network-note {
  margin-top: 22px;
  color: #93a1b5;
  font-size: 12px;
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.usecase {
  padding: 28px;
  border-top: 3px solid var(--primary);
  background: #fff;
  border-radius: 0 0 18px 18px;
  box-shadow: 0 8px 24px rgba(16,24,40,.05);
}

.usecase span {
  font-size: 12px;
  font-weight: 900;
  color: var(--primary);
}

.usecase h3 {
  margin: 14px 0 8px;
}

.usecase p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.soft-section {
  background: var(--soft);
}

.architecture {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}

.arch-node {
  padding: 26px 18px;
  text-align: center;
  border-radius: 20px;
  background: #fff;
  border: 1px solid #dbe6f3;
  box-shadow: 0 12px 30px rgba(16,24,40,.05);
}

.arch-icon {
  width: 58px;
  height: 58px;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #eaf3ff;
  color: var(--primary);
  font-size: 24px;
}

.arch-node h3 {
  margin: 0;
}

.arch-node p {
  color: var(--muted);
  font-size: 13px;
}

.arch-line {
  color: var(--primary);
  font-weight: 900;
  font-size: 24px;
}

.spec-wrap {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 28px;
  align-items: start;
}

.spec-table {
  overflow: hidden;
  background: #fff;
  border: 1px solid #e3e8ef;
  border-radius: 20px;
}

.spec-table div {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  padding: 18px 22px;
  border-bottom: 1px solid #edf0f3;
}

.spec-table div:last-child {
  border-bottom: 0;
}

.spec-table span {
  color: var(--muted);
  font-size: 13px;
}

.spec-table b {
  font-size: 14px;
}

.requirements {
  padding: 28px;
  border-radius: 20px;
  background: var(--dark);
  color: white;
}

.requirements h3 {
  margin-top: 0;
}

.requirements p,
.requirements li,
.requirements small {
  color: #aeb9ca;
}

.requirements ul {
  padding-left: 20px;
}

.cta {
  padding: 88px 0;
  background: linear-gradient(120deg, #e8f2ff, #f8fbff);
}

.cta-inner {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.cta h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.3;
}

.cta p:last-of-type {
  max-width: 760px;
  color: var(--muted);
}

footer {
  background: #050b13;
  color: #fff;
}

.footer-inner {
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer-inner p {
  margin: 5px 0 0;
  color: #8c9aac;
  font-size: 13px;
}

.footer-inner small {
  color: #697789;
}


.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-logo {
  width: 82px;
  height: 58px;
  object-fit: contain;
  flex: 0 0 auto;
}

.footer-brand strong {
  display: block;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-links a {
  color: #fff;
  font-weight: 700;
}

.footer-links a:hover {
  color: var(--primary-2);
}

@media (max-width: 900px) {
  .hero-grid,
  .spec-wrap {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 430px;
  }

  .feature-cards,
  .usecase-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .network-flow {
    grid-template-columns: 1fr;
  }

  .network-flow .arrow {
    transform: rotate(90deg);
    text-align: center;
  }

  .architecture {
    grid-template-columns: 1fr;
  }

  .arch-line {
    transform: rotate(90deg);
    text-align: center;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-grid div:nth-child(2) {
    border-right: 0;
  }

  .stat-grid div:nth-child(-n+2) {
    border-bottom: 1px solid rgba(255,255,255,.12);
  }

  .cta-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .nav-wrap {
    height: 68px;
  }

  .brand-logo {
    width: 58px;
    height: 40px;
  }

  .brand-text {
    font-size: 12px;
    max-width: 180px;
  }

  .menu-button {
    display: block;
  }

  .nav {
    position: absolute;
    top: 68px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 10px;
    border-radius: 16px;
    background: rgba(255,255,255,.98);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 13px 14px;
  }

  .hero {
    padding: 64px 0 56px;
  }

  .hero-grid {
    gap: 30px;
  }

  .hero h1 {
    font-size: 46px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-punch {
    padding: 17px 18px;
  }

  .hero-punch strong {
    font-size: 19px;
  }

  .hero-punch p {
    font-size: 12px;
  }

  .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 380px;
    transform: scale(.92);
    margin: -10px 0 -20px;
  }

  .radar {
    width: 330px;
    height: 330px;
  }

  .device-card {
    width: 205px;
  }

  .signal-card {
    min-width: 112px;
    padding: 11px 12px;
  }

  .sig-1 { top: 28px; left: -2px; }
  .sig-2 { top: 66px; right: -8px; }
  .sig-3 { bottom: 46px; right: -8px; }
  .sig-4 { bottom: 22px; left: -3px; }

  .section {
    padding: 72px 0;
  }

  .feature-cards,
  .usecase-grid,
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .stat-grid div {
    border-right: 0;
    border-bottom: 1px solid rgba(255,255,255,.12);
  }

  .stat-grid div:last-child {
    border-bottom: 0;
  }

  .flow-card {
    min-height: auto;
  }

  .spec-table div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    padding: 30px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-links {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .footer-logo {
    width: 74px;
    height: 52px;
  }
}