:root {
  --ink: #102033;
  --muted: #607085;
  --soft: #f4f8ff;
  --blue: #146bff;
  --blue-dark: #0746bb;
  --yellow: #ffd84d;
  --orange: #ff7a3d;
  --green: #17b890;
  --line: #dbe7f5;
  --card: #ffffff;
  --max: 1180px;
  --shadow: 0 28px 80px rgba(31, 77, 132, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 216, 77, 0.18), transparent 24%),
    radial-gradient(circle at 92% 7%, rgba(20, 107, 255, 0.14), transparent 28%),
    #fbfdff;
  font-family: "Inter", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.75;
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 16px;
  left: 50%;
  width: min(calc(100% - 32px), var(--max));
  min-height: 68px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 14px 12px 18px;
  border: 1px solid rgba(219, 231, 245, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 18px 60px rgba(31, 77, 132, 0.10);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand-logo {
  width: 148px;
  max-height: 42px;
  height: auto;
  object-fit: contain;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

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

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 8px;
  font-weight: 900;
  line-height: 1;
}

.nav-cta {
  padding: 0 20px;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 14px 34px rgba(20, 107, 255, 0.26);
}

.hero {
  width: min(var(--max), calc(100% - 40px));
  min-height: 620px;
  margin: 0 auto;
  padding: 148px 0 72px;
  display: flex;
  align-items: center;
}

.hero-copy {
  max-width: 820px;
}

.badge,
.section-kicker {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.badge {
  padding: 8px 12px;
  border-radius: 999px;
  background: #eef6ff;
  border: 1px solid #cfe4ff;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(42px, 6.2vw, 76px);
  line-height: 1.04;
  letter-spacing: 0;
}

h1 span {
  display: block;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 23px;
  line-height: 1.35;
}

.lead {
  max-width: 620px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 18px;
  font-weight: 600;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.button {
  min-width: 190px;
  padding: 0 22px;
  border: 1px solid var(--line);
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #00a7ff);
  border-color: transparent;
  box-shadow: 0 18px 40px rgba(20, 107, 255, 0.28);
}

.button.secondary {
  color: var(--blue-dark);
  background: #fff;
}

.trust-row,
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.trust-row span,
.filter-row a {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  font-weight: 800;
}

.tag,
.scope-list span {
  display: block;
  margin-bottom: 8px;
  color: var(--blue-dark);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.intro-band {
  padding: 64px 20px;
  color: #fff;
  background: #102033;
  text-align: center;
}

.intro-band p {
  margin-bottom: 10px;
  color: var(--yellow);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.intro-band h2 {
  max-width: 920px;
  margin: 0 auto;
  font-size: clamp(26px, 4vw, 45px);
}

.section {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 92px 0;
}

.section-head {
  max-width: 820px;
  margin-bottom: 34px;
}

.filter-row {
  margin-bottom: 28px;
}

.filter-row a {
  background: #fff;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.work-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  align-items: center;
  min-height: 420px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 18px 52px rgba(31, 77, 132, 0.08);
}

.featured-work {
  grid-column: 1 / -1;
  grid-template-columns: 320px 1fr;
  min-height: 560px;
  padding: 30px;
}

.phone-frame,
.phone-placeholder {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 9 / 16;
  margin: 0 auto;
  overflow: hidden;
  border: 10px solid #101820;
  border-radius: 26px;
  background: #101820;
  box-shadow: 0 24px 62px rgba(16, 32, 51, 0.22);
}

.phone-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #101820;
}

.youtube-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #101820;
}

.phone-placeholder {
  display: flex;
  flex-direction: column;
  justify-content: end;
  padding: 24px 18px;
  color: #fff;
  background:
    linear-gradient(160deg, rgba(20, 107, 255, 0.95), rgba(16, 32, 51, 0.95)),
    #102033;
}

.phone-placeholder.dark {
  background:
    linear-gradient(160deg, rgba(16, 32, 51, 0.98), rgba(23, 184, 144, 0.82)),
    #102033;
}

.phone-placeholder.warm {
  background:
    linear-gradient(160deg, rgba(255, 122, 61, 0.92), rgba(16, 32, 51, 0.94)),
    #102033;
}

.phone-placeholder.yellow {
  color: #102033;
  background:
    linear-gradient(160deg, rgba(255, 216, 77, 0.96), rgba(255, 255, 255, 0.88)),
    #ffd84d;
}

.phone-placeholder.blue {
  background:
    linear-gradient(160deg, rgba(7, 70, 187, 0.96), rgba(0, 183, 255, 0.72)),
    #0746bb;
}

.phone-placeholder span {
  margin-bottom: auto;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.phone-placeholder strong {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.25;
}

.phone-placeholder p {
  margin-bottom: 0;
  font-weight: 800;
}

.work-copy p,
.approach-grid p,
.scope-copy p,
.contact p {
  color: var(--muted);
  font-weight: 600;
}

.work-copy dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 26px 0 0;
}

.work-copy dl div {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.work-copy dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.work-copy dd {
  margin: 0;
  font-weight: 900;
}

.approach {
  border-top: 1px solid var(--line);
}

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

.approach-grid article {
  min-height: 260px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.approach-grid span {
  display: inline-flex;
  margin-bottom: 32px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.scope {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  align-items: center;
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.scope-list div {
  min-height: 150px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 42px rgba(31, 77, 132, 0.08);
}

.scope-list strong {
  display: block;
  font-size: 24px;
}

.contact {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto 64px;
  padding: 70px 54px;
  border-radius: 8px;
  color: #fff;
  background: #102033;
}

.contact p {
  max-width: 700px;
  color: rgba(255, 255, 255, 0.78);
}

.contact .button.secondary {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer p {
  margin: 0;
  font-weight: 800;
}

@media (max-width: 980px) {
  .nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 124px;
  }

  .works-grid,
  .approach-grid,
  .scope {
    grid-template-columns: 1fr;
  }

  .work-card,
  .featured-work {
    grid-template-columns: 1fr;
  }

  .phone-frame,
  .phone-placeholder {
    max-width: 280px;
  }
}

@media (max-width: 640px) {
  .site-header {
    top: 10px;
    width: calc(100% - 20px);
    min-height: 62px;
    padding: 10px;
  }

  .brand-logo {
    width: 118px;
    max-height: 36px;
  }

  .nav-cta {
    min-height: 40px;
    padding: 0 14px;
    font-size: 13px;
  }

  .hero,
  .section,
  .contact,
  .footer {
    width: calc(100% - 24px);
  }

  .hero {
    padding-top: 112px;
    gap: 28px;
  }

  h1 {
    font-size: 40px;
  }

  .lead {
    font-size: 16px;
  }

  .button {
    width: 100%;
  }

  .section {
    padding: 68px 0;
  }

  .intro-band {
    padding: 48px 16px;
  }

  .work-card,
  .featured-work {
    min-height: auto;
    padding: 18px;
  }

  .work-copy dl,
  .scope-list {
    grid-template-columns: 1fr;
  }

  .contact {
    padding: 48px 22px;
  }

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