@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700;800&family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap");

:root {
  --ink: #17364b;
  --ink-soft: #31566b;
  --muted: #668496;
  --aqua: #35b9c8;
  --aqua-dark: #168a9d;
  --mint: #8ce1cf;
  --coral: #ff8f79;
  --line: #ccebf0;
  --line-strong: #a7dce4;
  --paper: rgba(255, 255, 255, 0.92);
  --soft: #effbfc;
  --warm: #fff8f1;
  --shadow: 0 18px 54px rgba(30, 107, 124, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 3%, rgba(87, 210, 222, 0.2), transparent 30rem),
    radial-gradient(circle at 91% 16%, rgba(255, 197, 174, 0.22), transparent 25rem),
    linear-gradient(155deg, #ffffff 0%, #eefcff 48%, #fffaf5 100%);
  font-family: "Manrope", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(rgba(43, 164, 180, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent 70%);
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 68px;
  padding: 10px max(20px, calc((100vw - 1160px) / 2));
  border-bottom: 1px solid rgba(167, 220, 228, 0.75);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50% 50% 44% 44%;
  background: linear-gradient(145deg, #fff, #ccf7fa);
  color: var(--aqua-dark);
  font-size: 12px;
  box-shadow: 0 7px 18px rgba(53, 185, 200, 0.18);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  padding: 8px 11px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.nav a:hover,
.nav a:focus-visible {
  background: var(--soft);
  color: var(--aqua-dark);
}

.language-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  margin-left: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--aqua-dark);
  font-size: 12px;
  font-weight: 800;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.78fr);
  gap: 54px;
  align-items: center;
  min-height: 610px;
  padding: 62px 0 50px;
}

.hero-copy {
  animation: rise 0.7s ease both;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--aqua-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 143, 121, 0.13);
  content: "";
}

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: clamp(36px, 5.4vw, 66px);
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 1.07;
}

h1 em {
  color: var(--aqua-dark);
  font-style: normal;
}

.lead {
  max-width: 690px;
  margin-bottom: 26px;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
}

.hero-actions,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 17px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 800;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  border-color: var(--aqua);
  box-shadow: 0 9px 24px rgba(30, 138, 157, 0.16);
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--aqua), var(--aqua-dark));
  color: #fff;
}

.hero-stage {
  position: relative;
  align-self: stretch;
  min-height: 500px;
  overflow: hidden;
  border: 1px solid rgba(167, 220, 228, 0.9);
  border-radius: 38px 38px 120px 38px;
  background:
    radial-gradient(circle at 50% 38%, rgba(255, 255, 255, 0.96), transparent 42%),
    linear-gradient(160deg, rgba(216, 250, 253, 0.94), rgba(255, 244, 235, 0.88));
  box-shadow: var(--shadow);
  animation: rise 0.8s 0.1s ease both;
}

.hero-stage::before,
.hero-stage::after {
  position: absolute;
  border: 1px solid rgba(53, 185, 200, 0.25);
  border-radius: 50%;
  content: "";
}

.hero-stage::before {
  top: 34px;
  right: 30px;
  width: 88px;
  height: 88px;
}

.hero-stage::after {
  bottom: 88px;
  left: 28px;
  width: 44px;
  height: 44px;
}

.hero-stage img {
  position: absolute;
  right: -2%;
  bottom: -11%;
  width: 100%;
  max-height: 580px;
  object-fit: contain;
  object-position: bottom center;
  filter: drop-shadow(0 22px 26px rgba(41, 123, 140, 0.12));
}

.stage-label {
  position: absolute;
  top: 22px;
  left: 22px;
  z-index: 2;
  max-width: 220px;
  padding: 10px 13px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.5;
  backdrop-filter: blur(10px);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 56px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 38px rgba(41, 115, 130, 0.07);
}

.proof-item {
  min-height: 94px;
  padding: 20px;
  border-right: 1px solid var(--line);
}

.proof-item:last-child {
  border-right: 0;
}

.proof-item strong {
  display: block;
  margin-bottom: 2px;
  color: var(--aqua-dark);
  font-size: 14px;
}

.proof-item span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.section {
  padding: 54px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 42px;
  align-items: end;
  margin-bottom: 28px;
}

.section-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--coral);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(27px, 3.4vw, 42px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.section-heading p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.85;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.role-card,
.ecosystem-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: 0 12px 34px rgba(30, 107, 124, 0.07);
}

.role-card {
  min-height: 238px;
  padding: 27px;
  border-radius: 26px;
}

.role-card::after {
  position: absolute;
  right: -30px;
  bottom: -36px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(53, 185, 200, 0.13), rgba(140, 225, 207, 0.07));
  content: "";
}

.role-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-bottom: 18px;
  border-radius: 12px;
  background: var(--soft);
  color: var(--aqua-dark);
  font-size: 12px;
  font-weight: 800;
}

.role-card h3,
.ecosystem-card h3 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.role-card p,
.ecosystem-card p {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
}

.text-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  margin-top: 16px;
  color: var(--aqua-dark);
  font-size: 13px;
  font-weight: 800;
}

.text-link::after {
  margin-left: 6px;
  content: "\2197";
}

.system-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.flow-step {
  position: relative;
  min-height: 154px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.82);
}

.flow-step:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -14px;
  z-index: 2;
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  color: var(--aqua-dark);
  font-size: 12px;
  content: "\2192";
}

.flow-step small {
  display: block;
  margin-bottom: 8px;
  color: var(--coral);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.flow-step strong {
  display: block;
  margin-bottom: 7px;
  font-size: 15px;
}

.flow-step span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.ecosystem-card {
  display: flex;
  flex-direction: column;
  min-height: 238px;
  padding: 25px;
  border-radius: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.ecosystem-card:hover,
.ecosystem-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--aqua);
  box-shadow: var(--shadow);
}

.ecosystem-card .meta {
  margin-top: auto;
  padding-top: 20px;
  color: var(--aqua-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.ecosystem-card.featured {
  background: linear-gradient(145deg, #fff, #eafcfd);
}

.open-source {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 30px;
  align-items: center;
  margin: 54px 0;
  padding: 36px;
  border: 1px solid var(--line-strong);
  border-radius: 30px;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.96), rgba(228, 251, 253, 0.9)),
    var(--paper);
  box-shadow: var(--shadow);
}

.open-source p {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 14px;
}

.open-source .inline-links {
  justify-content: flex-end;
}

.site-footer {
  margin-top: 24px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.62);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: center;
  padding: 34px 0 40px;
}

.footer-brand strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
}

.footer-brand span,
.footer-links a {
  color: var(--muted);
  font-size: 12px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: flex-end;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--aqua-dark);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .nav a:not(.nav-keep) {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr 0.72fr;
    gap: 26px;
  }

  .hero-stage {
    min-height: 440px;
  }

  .proof-strip,
  .system-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-item:nth-child(2) {
    border-right: 0;
  }

  .proof-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .flow-step:not(:last-child)::after {
    display: none;
  }

  .ecosystem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  body {
    font-size: 15px;
  }

  .site-header {
    min-height: 60px;
    padding: 8px 14px;
  }

  .brand span:last-child {
    display: none;
  }

  .language-link {
    margin-left: auto;
  }

  .shell {
    width: min(100% - 28px, 1160px);
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 42px 0 24px;
  }

  h1 {
    font-size: clamp(34px, 12vw, 50px);
  }

  .hero-stage {
    min-height: 390px;
    border-radius: 30px 30px 82px 30px;
  }

  .hero-stage img {
    right: 0;
    width: 92%;
  }

  .proof-strip,
  .role-grid,
  .system-flow,
  .ecosystem-grid,
  .section-heading,
  .open-source,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .proof-item {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .proof-item:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 42px 0;
  }

  .section-heading {
    gap: 14px;
  }

  .open-source {
    gap: 24px;
    padding: 26px;
  }

  .open-source .inline-links,
  .footer-links {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}