:root {
  color-scheme: dark;
  --color-background: #090909;
  --color-foreground: #f4f2ef;
  --color-muted: #8b8784;
  --color-line: #2d2b2a;
  --color-accent: #9e131d;
  --color-accent-bright: #dc2b35;
  --content-width: 1440px;
  --page-gutter: clamp(1.5rem, 5vw, 4.5rem);
  --font-sans: Arial, "Noto Sans JP", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--color-background);
}

body {
  position: relative;
  isolation: isolate;
  min-width: 320px;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

button,
a {
  color: inherit;
  font: inherit;
}

a {
  text-decoration: none;
}

button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-accent-bright);
  outline-offset: 0.35rem;
}

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  transform: translateY(-200%);
  background: var(--color-foreground);
  color: var(--color-background);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto 1fr auto;
  width: min(100%, var(--content-width));
  min-height: 100svh;
  margin: 0 auto;
  padding: clamp(1.75rem, 4vw, 3.25rem) var(--page-gutter) clamp(1.25rem, 3vw, 2rem);
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
}

body::before {
  background: linear-gradient(
    156deg,
    transparent 0 73.8%,
    #2d3338 73.8% 74.5%,
    #1a1e21 74.5% 86%,
    #101214 100%
  );
}

body::after {
  background:
    linear-gradient(156deg, transparent 0 73.8%, var(--color-accent) 73.8% 74.05%, transparent 74.05% 100%),
    linear-gradient(156deg, transparent 0 75.05%, rgb(158 19 29 / 0.48) 75.05% 75.18%, transparent 75.18% 100%);
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  min-width: 7rem;
}

.site-logo img {
  display: block;
  width: clamp(7.5rem, 14vw, 10rem);
  height: auto;
}

.site-nav ul,
.business-domains ul {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav ul {
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.site-nav a,
.site-nav button,
.site-footer a,
.site-footer small,
.business-domains li {
  color: var(--color-muted);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  line-height: 1.2;
  white-space: nowrap;
}

.site-nav a,
.site-nav button,
.site-footer a {
  transition: color 160ms ease;
}

.site-nav a:hover,
.site-nav button:hover,
.site-footer a:hover,
.site-nav a:focus-visible,
.site-nav button:focus-visible,
.site-footer a:focus-visible {
  color: var(--color-foreground);
}

.site-nav .contact-link {
  color: var(--color-accent-bright);
}

.site-nav .contact-link:hover,
.site-nav .contact-link:focus-visible {
  color: #f15a61;
}

.site-main {
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: center;
  min-height: 0;
  padding: clamp(3rem, 8vh, 7rem) 0 clamp(2rem, 6vh, 5rem);
}

.hero {
  display: grid;
  align-content: center;
  min-height: 0;
}

.hero h1 {
  margin: 0;
  color: var(--color-foreground);
  font-size: clamp(2.5rem, 7vw, 5.75rem);
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 1.05;
}

.business-domains {
  border-top: 1px solid var(--color-line);
}

.business-domains ul {
  display: grid;
  grid-template-columns: 1.5fr repeat(5, 1fr);
}

.business-domains li {
  padding: 1.1rem 0.75rem 0.25rem 0;
}

.business-domains li::before {
  display: inline-block;
  width: 1rem;
  margin-right: 0.35rem;
  color: var(--color-accent-bright);
  content: counter(domain, decimal-leading-zero);
}

.business-domains ul {
  counter-reset: domain;
}

.business-domains li {
  counter-increment: domain;
}

.site-footer {
  align-items: end;
  padding-top: 1rem;
}

.site-footer small {
  font-size: 0.625rem;
}

dialog {
  width: min(42rem, calc(100% - 2rem));
  padding: 0;
  border: 1px solid var(--color-line);
  background: var(--color-background);
  color: var(--color-foreground);
}

dialog::backdrop {
  background: rgb(0 0 0 / 78%);
}

.dialog-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem;
}

.dialog-content {
  min-width: 0;
}

.dialog-content p {
  margin: 0.35rem 0 0;
  color: var(--color-muted);
  font-size: 0.8125rem;
}

.service-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 1.5rem;
  margin: 1rem 0 0;
  padding: 0;
  color: var(--color-muted);
  font-size: 0.8125rem;
  list-style: none;
}

.dialog-inner h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.14em;
}

.dialog-inner button {
  color: var(--color-accent-bright);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.privacy-shell {
  min-height: 100svh;
}

.privacy-back {
  color: var(--color-accent-bright);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.privacy-main {
  width: min(100%, 48rem);
  padding: 4rem 0 5rem;
}

.privacy-kicker {
  margin: 0 0 1rem;
  color: var(--color-accent-bright);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
}

.privacy-main h1 {
  margin: 0 0 3rem;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.2;
}

.privacy-content {
  color: var(--color-muted);
  font-size: 0.875rem;
  line-height: 2;
}

.privacy-content section {
  margin-top: 2.5rem;
}

.privacy-content h2 {
  margin: 0 0 0.75rem;
  color: var(--color-foreground);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.privacy-content p {
  margin: 0.75rem 0 0;
}

.privacy-content a {
  color: var(--color-accent-bright);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.privacy-date {
  margin: 3rem 0 0;
  color: var(--color-muted);
  font-size: 0.75rem;
}

@media (max-width: 700px) {
  .privacy-main {
    padding-top: 3rem;
    padding-bottom: 4rem;
  }

  .privacy-main h1 {
    margin-bottom: 2rem;
  }
}

@media (max-height: 620px) and (min-width: 701px) {
  .site-shell {
    padding-top: 1.25rem;
    padding-bottom: 1rem;
  }

  .site-main {
    padding-top: 2rem;
    padding-bottom: 1.5rem;
  }

  .business-domains li {
    padding-top: 0.75rem;
  }
}

@media (max-width: 700px) {
  .site-shell {
    min-height: 100svh;
  }

  .site-header {
    align-items: flex-start;
    gap: 1.5rem;
  }

  .site-nav ul {
    flex-wrap: wrap;
    justify-content: end;
    gap: 0.75rem 1rem;
  }

  .site-main {
    padding-top: clamp(4rem, 12vh, 7rem);
    padding-bottom: 3rem;
  }

  .hero h1 {
    font-size: clamp(2.15rem, 11vw, 4rem);
  }

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

  .business-domains li {
    padding-top: 0.9rem;
  }

  .business-domains li:first-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav a,
  .site-nav button,
  .site-footer a {
    transition: none;
  }
}