:root {
  color-scheme: dark;
  --bg: #060a12;
  --bg-elevated: #0d1524;
  --bg-soft: #090f1a;
  --ink: #f5f7fb;
  --muted: #9aa6b5;
  --line: rgba(255, 255, 255, 0.1);
  --navy: #07101d;
  --accent: #75e9fc;
  --accent-soft: rgba(117, 233, 252, 0.16);
  --accent-strong: #3ec9e0;
  --header-h: 4rem;
  --font-sans: "IBM Plex Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --font-latin: "Outfit", "IBM Plex Sans JP", sans-serif;
  --radius-lg: 1.4rem;
  --shadow-deep: 0 28px 80px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  background: #fff;
  color: #000;
}

.skip-link:focus {
  top: 1rem;
}

.shell {
  width: min(1080px, calc(100% - 1.5rem));
  margin-inline: auto;
}

.shell--narrow {
  width: min(720px, calc(100% - 1.5rem));
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
}

.site-header.is-solid {
  background: rgba(6, 10, 18, 0.78);
  border-bottom-color: var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.logo {
  font-family: var(--font-latin);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: #fff;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.55rem 0.85rem;
}

.nav a {
  font-family: var(--font-latin);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.68);
  transition: color 0.2s ease;
}

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

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  overflow: clip;
  background:
    radial-gradient(120% 90% at 50% -10%, rgba(62, 201, 224, 0.18), transparent 48%),
    linear-gradient(180deg, #0b1730 0%, var(--navy) 48%, #04070e 100%);
  color: #fff;
}

.hero__backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(90px);
}

.hero__glow--core {
  width: min(70vw, 560px);
  height: min(70vw, 560px);
  left: 50%;
  top: 18%;
  transform: translateX(-50%);
  background: rgba(117, 233, 252, 0.18);
}

.hero__glow--left {
  width: min(48vw, 380px);
  height: min(48vw, 380px);
  left: -8%;
  bottom: 8%;
  background: rgba(59, 130, 246, 0.2);
}

.hero__glow--right {
  width: min(42vw, 340px);
  height: min(42vw, 340px);
  right: -4%;
  top: 28%;
  background: rgba(148, 163, 184, 0.14);
}

.hero__beam {
  position: absolute;
  inset: 8% 10% auto;
  height: 42%;
  background: linear-gradient(
    105deg,
    transparent 10%,
    rgba(117, 233, 252, 0.08) 45%,
    transparent 78%
  );
  filter: blur(28px);
  transform: rotate(-8deg);
}

.hero__noise {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 42%, #000 12%, transparent 70%);
  opacity: 0.55;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: calc(var(--header-h) + 4.2rem) 0 4.8rem;
}

.hero__brand {
  margin: 0 0 1.35rem;
  font-family: var(--font-latin);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.66);
}

.hero__title {
  margin: 0;
  max-width: 10.5em;
  font-size: clamp(2.55rem, 9.2vw, 5rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.03em;
  color: #ffffff;
  text-shadow:
    0 0 40px rgba(117, 233, 252, 0.18),
    0 18px 60px rgba(0, 0, 0, 0.35);
}

.hero__lead {
  margin: 1.55rem 0 0;
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(0.96rem, 2.8vw, 1.08rem);
  line-height: 1.9;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.95rem;
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease,
    border-color 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--light {
  background-image: linear-gradient(#ffffff, #f3f8ff);
  color: #0b1220;
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn--accent {
  background: linear-gradient(135deg, rgba(117, 233, 252, 0.95), rgba(62, 201, 224, 0.9));
  color: #041018;
  border-color: transparent;
  box-shadow: 0 12px 36px rgba(62, 201, 224, 0.28);
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(4.8rem, 12vw, 8.2rem) 0;
  position: relative;
}

.section--about,
.section--projects {
  background: var(--bg);
}

.section--business,
.section--company {
  background:
    linear-gradient(180deg, rgba(117, 233, 252, 0.03), transparent 28%),
    var(--bg-soft);
  border-block: 1px solid var(--line);
}

.section--contact {
  background:
    radial-gradient(90% 80% at 80% 0%, rgba(117, 233, 252, 0.14), transparent 50%),
    linear-gradient(165deg, #0a1424 0%, #0d1a30 100%);
}

.section__intro {
  max-width: 40rem;
  margin-bottom: clamp(2.2rem, 6vw, 3.4rem);
}

.label {
  margin: 0 0 0.85rem;
  font-family: var(--font-latin);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.heading {
  margin: 0;
  font-size: clamp(1.7rem, 5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.35;
  color: #fff;
}

.lead {
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 2;
}

.lead--short {
  max-width: 34rem;
}

.lead--on-dark {
  color: var(--muted);
}

/* ---------- About ---------- */
.about {
  display: grid;
  gap: 1.6rem;
}

@media (min-width: 860px) {
  .about {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 3rem;
    align-items: start;
  }

  .shell {
    width: min(1080px, calc(100% - 2.5rem));
  }

  .shell--narrow {
    width: min(720px, calc(100% - 2.5rem));
  }

  .nav {
    gap: 0.85rem 1.15rem;
  }

  .nav a {
    font-size: 0.82rem;
  }
}

.about__body {
  position: relative;
}

.about__rule {
  margin: 0 0 1.2rem;
  width: 3rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.about__lead {
  margin: 0;
  font-size: clamp(1.05rem, 2.6vw, 1.2rem);
  line-height: 2.05;
  color: rgba(245, 247, 251, 0.82);
}

/* ---------- Business cards ---------- */
.cards {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 860px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.15rem;
  }
}

.card {
  position: relative;
  overflow: hidden;
  min-height: 13.5rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015)),
    rgba(10, 16, 28, 0.88);
  box-shadow: var(--shadow-deep);
  backdrop-filter: blur(10px);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(117, 233, 252, 0.45), transparent);
  opacity: 0.7;
}

.card__index {
  position: absolute;
  right: -0.1rem;
  bottom: -0.85rem;
  margin: 0;
  font-family: var(--font-latin);
  font-size: clamp(5.5rem, 18vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: rgba(117, 233, 252, 0.12);
  pointer-events: none;
  user-select: none;
}

.card__content {
  position: relative;
  z-index: 1;
  padding: 1.55rem 1.4rem 1.7rem;
}

.card__num {
  margin: 0 0 1.35rem;
  font-family: var(--font-latin);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.card__title {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #fff;
}

.card__text {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 16rem;
}

/* ---------- Projects ---------- */
.project {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(117, 233, 252, 0.28);
  border-radius: calc(var(--radius-lg) + 0.15rem);
  background:
    linear-gradient(135deg, rgba(117, 233, 252, 0.14), rgba(13, 21, 36, 0.2) 38%, rgba(7, 12, 22, 0.95)),
    var(--bg-elevated);
  box-shadow:
    0 0 0 1px rgba(117, 233, 252, 0.05),
    0 30px 80px rgba(0, 0, 0, 0.4);
  padding: clamp(1.7rem, 5vw, 2.8rem);
}

.project__glow {
  position: absolute;
  width: min(70%, 420px);
  height: min(70%, 280px);
  right: -8%;
  top: -20%;
  border-radius: 999px;
  background: rgba(117, 233, 252, 0.18);
  filter: blur(50px);
  pointer-events: none;
}

.project__body {
  position: relative;
  z-index: 1;
}

.project__tag {
  margin: 0;
  font-family: var(--font-latin);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.project__name {
  margin: 0.7rem 0 0;
  font-family: var(--font-latin);
  font-size: clamp(2.7rem, 10vw, 4.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: #75e9fc;
  text-shadow: 0 0 40px rgba(117, 233, 252, 0.25);
}

.project__text {
  margin: 1.15rem 0 1.7rem;
  max-width: 32rem;
  color: rgba(245, 247, 251, 0.78);
  line-height: 1.9;
}

/* ---------- Company / Contact ---------- */
.facts {
  margin: 2.2rem 0 0;
}

.facts__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.3rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.facts__row:last-child {
  border-bottom: 1px solid var(--line);
}

.facts__row dt {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
}

.facts__row dd {
  margin: 0;
  font-size: 1rem;
  color: #fff;
}

.mail {
  display: inline-block;
  margin-top: 1.7rem;
  font-family: var(--font-latin);
  font-size: clamp(1.15rem, 4.5vw, 1.65rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #fff;
  border-bottom: 1px solid rgba(117, 233, 252, 0.45);
  padding-bottom: 0.15rem;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.mail:hover {
  color: var(--accent);
  opacity: 1;
}

.footer {
  background: #03060b;
  color: rgba(255, 255, 255, 0.42);
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.footer__inner {
  display: flex;
  justify-content: flex-start;
}

.footer__copy {
  margin: 0;
  font-family: var(--font-latin);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
}

.br-desktop {
  display: none;
}

/* ---------- Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 720px) {
  .br-desktop {
    display: inline;
  }

  .facts__row {
    grid-template-columns: 6.5rem 1fr;
    gap: 1rem;
  }

  .hero__content {
    padding: calc(var(--header-h) + 5.2rem) 0 5.8rem;
  }
}

@media (max-width: 719px) {
  .hero {
    min-height: auto;
    align-items: start;
  }

  .hero__content {
    padding: calc(var(--header-h) + 3.15rem) 0 2.6rem;
  }

  .section {
    /* Keep generous spacing, but tighten to ~80% on mobile */
    padding: clamp(3.85rem, 9.6vw, 6.55rem) 0;
  }

  .hero__title {
    letter-spacing: 0.02em;
  }

  .card {
    min-height: 12.2rem;
  }

  .project__name {
    font-size: clamp(2.5rem, 14vw, 3.4rem);
  }
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover {
    transform: none;
  }
}