:root {
  --bg: #070b16;
  --bg-alt: #0b1222;
  --panel: rgba(255, 255, 255, 0.04);
  --line: rgba(255, 255, 255, 0.12);
  --text: #e6edf7;
  --muted: #9fb0c8;
  --accent-1: #3b82f6;
  --accent-2: #22d3ee;
  --on-accent: #04101f;
  --gradient: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  --font-ja: "Noto Sans JP", system-ui, sans-serif;
  --font-en: "Inter", "Noto Sans JP", system-ui, sans-serif;
  --header-h: 64px;
  --container: 1080px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ja);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
dl,
dd,
ol {
  margin: 0;
}

ol {
  padding: 0;
  list-style: none;
}

a {
  color: var(--accent-2);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.text-gradient,
.logo__accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ヘッダー */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: rgba(7, 11, 22, 0.8);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 16px;
  min-height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.logo__mark {
  flex: none;
  width: 36px;
  height: 36px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 28px;
}

.site-nav a {
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ボタン */
.button {
  display: inline-block;
  padding: 14px 32px;
  background: var(--gradient);
  border-radius: 999px;
  color: var(--on-accent);
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(34, 211, 238, 0.3);
}

/* ヒーロー */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(100vh, 860px);
  min-height: min(100svh, 860px);
  padding: calc(var(--header-h) + 48px) 0 72px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 400px at 15% 20%, rgba(59, 130, 246, 0.28), transparent 70%),
    radial-gradient(520px 380px at 85% 75%, rgba(34, 211, 238, 0.18), transparent 70%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, #000 20%, transparent 75%);
}

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

.hero__eyebrow,
.section__eyebrow {
  color: var(--accent-2);
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero__title {
  margin-top: 20px;
  font-size: clamp(34px, 6.4vw, 64px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.hero__lead {
  max-width: 640px;
  margin: 28px 0 40px;
  color: var(--muted);
  font-size: 17px;
}

/* セクション共通 */
.section {
  padding: 104px 0;
}

.section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section__header {
  margin-bottom: 48px;
}

.section__title {
  margin-top: 8px;
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.4;
}

/* 事業内容 */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card,
.strength {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.card {
  padding: 32px 28px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-2);
  box-shadow: 0 12px 40px rgba(34, 211, 238, 0.14);
}

.card__icon {
  width: 40px;
  height: 40px;
  fill: none;
  stroke: var(--accent-2);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card__title {
  margin: 20px 0 12px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
}

.card__text,
.strength__text {
  color: var(--muted);
  font-size: 15px;
}

.strength {
  margin-top: 24px;
  padding: 28px 32px;
  border-left: 3px solid var(--accent-2);
}

.strength__title {
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 700;
}

/* 会社概要 */
.profile {
  border-top: 1px solid var(--line);
}

.profile__row {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 8px 24px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.profile dt {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.profile dd {
  overflow-wrap: anywhere;
}

/* 沿革 */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-1), var(--accent-2));
}

.timeline__item {
  position: relative;
  padding-bottom: 36px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: -32px;
  width: 11px;
  height: 11px;
  background: var(--accent-2);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-2);
}

.timeline__date {
  color: var(--accent-2);
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.timeline__text {
  font-size: 17px;
}

/* お問い合わせ */
.contact {
  text-align: center;
}

.contact__text {
  margin: 20px 0 32px;
  color: var(--muted);
}

.contact__mail {
  font-family: var(--font-en);
  font-size: 18px;
  overflow-wrap: anywhere;
}

/* フッター */
.site-footer {
  padding: 32px 0;
  color: var(--muted);
  font-family: var(--font-en);
  font-size: 13px;
  text-align: center;
}

/* フェードイン。JavaScript が動いたときだけ隠す */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* フェードイン後もカードのホバーを効かせる */
.js .card.reveal {
  transition: opacity 0.6s ease-out, transform 0.6s ease-out, border-color 0.25s, box-shadow 0.25s;
}

.js .card.reveal.is-visible:hover {
  transform: translateY(-4px);
}

/* カードが3列に収まらない幅 */
@media (max-width: 1040px) {
  .cards {
    grid-template-columns: 1fr;
  }
}

/* 狭い画面 */
@media (max-width: 760px) {
  .site-nav {
    gap: 0 16px;
    padding-bottom: 8px;
  }

  .site-nav a {
    font-size: 13px;
  }

  .js .nav-toggle {
    display: flex;
  }

  .js .site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 8px 0 16px;
    border-top: 1px solid var(--line);
  }

  .js .site-nav.is-open {
    display: flex;
  }

  .js .site-nav a {
    padding: 12px 0;
    font-size: 15px;
  }

  .section {
    padding: 72px 0;
  }

  .section__header {
    margin-bottom: 32px;
  }

  .profile__row {
    grid-template-columns: 1fr;
    padding: 16px 4px;
  }

  .hero__lead {
    font-size: 16px;
  }
}

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

  .js .reveal,
  .js .card.reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button,
  .card,
  .nav-toggle__bar {
    transition: none;
  }
}

/* 印刷・PDF 保存 */
@media print {
  :root {
    --bg: #fff;
    --bg-alt: #fff;
    --panel: transparent;
    --line: #ccc;
    --text: #111;
    --muted: #444;
    --accent-2: #0e7490;
  }

  .site-header {
    position: static;
    background: none;
  }

  .site-nav,
  .nav-toggle,
  .js .nav-toggle {
    display: none;
  }

  .hero {
    min-height: 0;
    padding: 24px 0;
  }

  .hero::before,
  .hero::after {
    display: none;
  }

  .text-gradient,
  .logo__accent {
    background: none;
    color: #1d4ed8;
  }

  .section {
    padding: 32px 0;
  }

  .js .reveal,
  .js .card.reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .card,
  .strength,
  .profile__row,
  .timeline__item {
    break-inside: avoid;
  }

  .timeline::before,
  .timeline__item::before {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
    box-shadow: none;
  }

  .button {
    padding: 0;
    background: none;
    color: #111;
  }
}