:root {
  --bg: #f7fbff;
  --white: #ffffff;
  --primary: #0b66c3;
  --primary-deep: #094f97;
  --text: #12304f;
  --muted: #557393;
  --line: #d8e8f8;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-snap-type: none;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Noto Sans JP', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #f5f5f7;
}

.container {
  width: min(1240px, 92%);
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .35s ease, border-color .35s ease, backdrop-filter .35s ease;
}
.site-header.scrolled {
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(14px);
  border-bottom-color: rgba(170, 206, 240, 0.45);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}
.logo {
  font-weight: 800;
  letter-spacing: .02em;
  color: #eef6ff;
  transition: color .3s ease;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.logo-img {
  width: 46px;
  height: 46px;
  object-fit: contain;
  display: block;
}
.logo-text {
  color: inherit;
  font-weight: 800;
  letter-spacing: .02em;
}
nav a {
  color: #e6f1ff;
  text-decoration: none;
  margin-left: 18px;
  font-weight: 500;
  transition: color .3s ease;
}
nav a:hover { color: #ffffff; }
.site-header.scrolled .logo { color: var(--primary-deep); }
.site-header.scrolled nav a { color: var(--text); }
.site-header.scrolled nav a:hover { color: var(--primary); }

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(167, 201, 234, 0.55);
  background: #081a31;
}
.hero-fullscreen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 0 70px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 22%, rgba(88, 160, 255, 0.12), rgba(88, 160, 255, 0) 28%),
    radial-gradient(circle at 82% 30%, rgba(37, 112, 204, 0.10), rgba(37, 112, 204, 0) 26%),
    linear-gradient(135deg, rgba(8, 26, 49, 0.34) 0%, rgba(11, 38, 72, 0.24) 42%, rgba(16, 53, 95, 0.28) 100%),
    url('https://images.unsplash.com/photo-1578575437130-527eed3abbec?auto=format&fit=crop&w=2200&q=80') center/cover no-repeat;
  transform: scale(1.03);
}
.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.42), rgba(0,0,0,0.08));
  opacity: 0.16;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: auto 9% 14% auto;
  width: min(38vw, 460px);
  height: min(38vw, 460px);
  border: 1px solid rgba(173, 210, 255, 0.14);
  border-radius: 50%;
  box-shadow:
    0 0 0 28px rgba(173, 210, 255, 0.035),
    0 0 0 72px rgba(173, 210, 255, 0.02);
  opacity: 0.30;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 12, 24, .28) 0%, rgba(5, 12, 24, .12) 44%, rgba(5, 12, 24, .34) 100%),
    linear-gradient(90deg, rgba(6, 18, 34, .18) 0%, rgba(6, 18, 34, .05) 42%, rgba(6, 18, 34, .16) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
}
.tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(217,237,255,.2);
  color: #e9f4ff;
  border: 1px solid rgba(200,228,255,.35);
  font-weight: 700;
  font-size: 13px;
}
h1 {
  font-size: clamp(48px, 9vw, 96px);
  line-height: 1.02;
  margin: 0 0 18px;
  color: #fff;
  letter-spacing: -.03em;
  font-weight: 700;
}
.lead {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 600;
  color: #f0f0f4;
}
.sub {
  margin: 0 auto;
  color: #e1e1e6;
  max-width: 660px;
  font-size: clamp(14px, 1.4vw, 18px);
}
.hero-btns {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn {
  display: inline-block;
  padding: 11px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
}
.btn.primary {
  background: linear-gradient(120deg, #0d6fd0, #0a58aa);
  color: #fff;
  box-shadow: 0 10px 24px rgba(9, 79, 151, 0.25);
}
.btn.primary:hover { filter: brightness(0.97); }
.btn.ghost {
  border: 1px solid rgba(190, 223, 252, .65);
  color: #e9f4ff;
  background: rgba(255,255,255,.08);
}
.glass,
.hero-card {
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 22px;
  padding: 26px;
  backdrop-filter: blur(16px);
  box-shadow: 0 24px 70px rgba(2, 10, 24, 0.34);
  animation: floatCard 6s ease-in-out infinite;
  max-width: 620px;
  margin: 10px auto 0;
  text-align: left;
}
.hero-card h3 { margin-top: 0; color: #f7fbff; }
.hero-card ul { margin: 0; padding-left: 1.2em; color: #e7f2ff; }
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  color: #d9ecff;
  text-decoration: none;
  font-size: 12px;
  letter-spacing: .18em;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 3;
}
.scroll-cue i {
  display: block;
  width: 1px;
  height: 46px;
  background: linear-gradient(to bottom, rgba(217,236,255,.15), rgba(217,236,255,1));
  animation: scrollPulse 1.8s ease-in-out infinite;
}

.section {
  margin: 0;
  padding: 78px 0;
  background: #ffffff;
  border-top: 1px solid #ececf1;
  border-bottom: 1px solid #ececf1;
}
.kpi {
  position: relative;
  background: linear-gradient(180deg, #f0f3f8 0%, #f7f8fb 52%, #ffffff 100%);
}
.kpi::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to bottom, rgba(10,10,12,0), rgba(240,243,248,.82) 62%, #f0f3f8 100%);
  pointer-events: none;
}
.section.alt { background: #f5f5f7; }
.section-about {
  position: relative;
  background: linear-gradient(180deg,#ffffff 0%,#f8fbff 100%);
  overflow: hidden;
}
.about-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 22%, rgba(28,116,204,.12), rgba(28,116,204,0) 30%),
    radial-gradient(circle at 78% 75%, rgba(15,86,160,.10), rgba(15,86,160,0) 34%);
  pointer-events: none;
}
.about-focus {
  position: relative;
  z-index: 1;
  display: block;
}
.about-main {
  background: rgba(255,255,255,.92);
  border: 1px solid #e6edf6;
  border-radius: 22px;
  padding: clamp(30px, 3.4vw, 52px);
}
.about-main-full {
  max-width: 980px;
  margin: 0 auto;
}
.about-meta {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid #dce9f7;
  border-radius: 12px;
  background: linear-gradient(180deg,#fcfeff,#f4f9ff);
  display: grid;
  grid-template-columns: repeat(3,minmax(0,1fr));
  gap: 8px 14px;
  color: #4f7093;
  font-size: 14px;
}
.about-meta p { margin: 0; }
.about-points {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 12px;
}
.about-points article {
  background: linear-gradient(160deg,#ffffff,#f4f9ff);
  border: 1px solid #ddeafa;
  border-radius: 12px;
  padding: 12px;
}
.about-points h4 {
  margin: 0 0 6px;
  color: #0c5ea9;
  font-size: 14px;
}
.about-points p {
  margin: 0;
  color: #53769a;
  font-size: 13px;
  line-height: 1.6;
}
.about-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 3px solid #7db1e3;
  background: #f6fbff;
  color: #4d7094;
  border-radius: 8px;
  font-size: 14px;
}
.section-business { background: linear-gradient(180deg,#f4f6fb 0%,#eef3fa 100%); }
.section-flow { background: #ffffff; }
.section-cases { background: #f7f8fb; }
.section-strength { background: linear-gradient(180deg,#ffffff 0%,#f7fbff 100%); }
.section-contact { background: linear-gradient(180deg,#f2f6fb 0%,#ffffff 100%); }
h2 {
  margin: 0 0 16px;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: #1d1d1f;
}
.section-sub {
  margin-top: -4px;
  color: var(--muted);
}
.kpi {
  margin-top: 0;
  padding-top: 34px;
  padding-bottom: 34px;
}

/* continuous scroll layout */
.hero-fullscreen {
  min-height: 100vh;
  display: flex;
  align-items: center;
}
.kpi-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  align-items: stretch;
}
.kpi-left {
  background: linear-gradient(155deg, #0d2440 0%, #123b67 55%, #1a5d99 100%);
  color: #f0f6ff;
  border-radius: 26px;
  padding: clamp(28px, 4vw, 54px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.kpi-eyebrow {
  margin: 0;
  letter-spacing: .16em;
  text-transform: uppercase;
  font-size: 12px;
  color: #7ea6cc;
}
.about-main .kpi-eyebrow { color: #6f93b8; }
.kpi-title {
  margin: 10px 0 16px;
  color: #fff;
}
.kpi-copy {
  margin: 0;
  color: #d6e8fb;
}
.kpi-right {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
}
.metric {
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(178, 212, 243, .7);
  border-radius: 16px;
  padding: 20px 16px;
  min-height: 135px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.metric-hero {
  grid-column: 1 / -1;
  min-height: 165px;
  background: linear-gradient(150deg, #ffffff 0%, #edf5ff 100%);
}
.metric-num {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 52px);
  line-height: 1;
  font-weight: 800;
  color: #0a58aa;
}
.metric-label {
  margin: 8px 0 0;
  color: #4f7093;
  font-size: 14px;
}
.split-stage,
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  align-items: stretch;
}

/* section variety */
.layout-about { grid-template-columns: 1.2fr .8fr; }
.layout-business { grid-template-columns: .85fr 1.15fr; }
.layout-flow { display: grid; gap: 24px; }
.layout-cases { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
.layout-strength { grid-template-columns: 1fr 1fr; }
.layout-contact { grid-template-columns: .95fr 1.05fr; }
.split-left,
.split-right {
  border-radius: 22px;
}
.split-left {
  background: #ffffff;
  border: 1px solid #e7edf4;
  padding: clamp(24px, 3vw, 42px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.split-left.dark {
  background: linear-gradient(155deg, #0d2440 0%, #123b67 55%, #1a5d99 100%);
  color: #f0f6ff;
  border-color: transparent;
}
.split-left.dark h2,
.split-left.dark p,
.split-left.dark .section-sub,
.split-left.dark .kpi-eyebrow { color: #e8f2ff; }
.split-right {
  display: grid;
  align-content: center;
}
.info-cards {
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
}
.panel {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
}
.panel h3 { margin: 0 0 8px; color: #0b5da9; }
.panel p { margin: 6px 0; }

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 22px;
  margin-top: 24px;
}
.card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  min-height: 210px;
  box-shadow: 0 10px 24px rgba(28, 93, 160, 0.08);
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 34px rgba(28, 93, 160, 0.16);
  border-color: #a4c9ec;
}
.card h3 { margin-top: 0; color: #0d5fae; }
.section-business .card:nth-child(1) { background: linear-gradient(160deg,#ffffff,#eef6ff); }
.section-business .card:nth-child(2) { background: linear-gradient(160deg,#ffffff,#f2f8ff); }
.section-business .card:nth-child(3) { background: linear-gradient(160deg,#ffffff,#f6fbff); }
.section-business .card:nth-child(4) { background: linear-gradient(160deg,#ffffff,#edf4ff); }

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 14px;
}
.section-flow .timeline {
  background: linear-gradient(90deg,#f5f9ff,#ffffff);
  padding: 14px;
  border-radius: 16px;
  border: 1px solid #e5edf7;
}
.step {
  background: rgba(255,255,255,.95);
  border: 1px solid rgba(177, 212, 243, .75);
  border-radius: 12px;
  padding: 16px;
}
.step span {
  font-size: 12px;
  font-weight: 700;
  color: #0c5fae;
}
.step h4 {
  margin: 6px 0 8px;
  color: #0a4f98;
}
.step p { margin: 0; color: #4f7093; }

.case-grid {
  grid-template-columns: 1fr;
}
.section-cases .case-grid .card:first-child {
  border-left: 4px solid #1a66b8;
  transform: scale(1.01);
}
.case-grid p { margin: 6px 0; }
.sign {
  margin-top: 14px;
  font-weight: 700;
  color: #0a4f98;
}
.news-list {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}
.news-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid rgba(177, 212, 243, .75);
  border-radius: 10px;
  background: rgba(255,255,255,.84);
}
.news-date {
  margin: 0;
  font-weight: 700;
  color: #0c5fae;
}
.news-title {
  margin: 0;
}

.strength-list {
  margin: 0;
  padding-left: 1.2em;
}
.contact-box {
  margin-top: 0;
  border: 1px dashed #9fc7ef;
  background: rgba(255, 255, 255, 0.98);
  border-radius: 18px;
  padding: 34px;
  box-shadow: 0 16px 30px rgba(20,70,130,.08);
}
.site-footer {
  border-top: 1px solid rgba(183, 214, 245, 0.7);
  background: rgba(255,255,255,0.6);
  padding: 20px 0;
  color: #5f7e9f;
  font-size: 14px;
}

/* reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}


@keyframes bgShift {
  0% { background-position: 0% 0%, 100% 0%, 100% 100%, 0% 0%; }
  100% { background-position: 8% 6%, 92% 2%, 94% 92%, 0% 0%; }
}
@keyframes floatCard {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}
@keyframes scrollPulse {
  0% { opacity: .3; transform: scaleY(.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  100% { opacity: .3; transform: scaleY(.6); transform-origin: top; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
  .kpi-stage { grid-template-columns: 1fr; }
  .kpi-right { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .timeline { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .split-stage, .two-col, .layout-cases, .layout-contact, .layout-business, .layout-about, .layout-strength, .about-focus { grid-template-columns: 1fr; }
  .about-meta { grid-template-columns: 1fr 1fr; }
  .about-points { grid-template-columns: 1fr 1fr; }
  .info-cards { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .hero-fullscreen,
  main > .section,
  main > .section.alt,
  .kpi { min-height: auto; }
}

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  nav { display: none; }
  .cards { grid-template-columns: 1fr; }
  .kpi-right, .timeline, .info-cards, .about-points, .about-meta { grid-template-columns: 1fr; }
}