*, *::before, *::after { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
  }
  img { max-width: 100%; display: block; }
  a { color: inherit; text-decoration: none; }
  ul { list-style: none; margin: 0; padding: 0; }
  :focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
  }
  section[id] { scroll-margin-top: 96px; }

  :root {
    --color-bg: #ffffff;
    --color-text: #1c1c1e;
    --color-text-sub: #4f5560;
    --color-text-mute: #8a8f97;
    --color-line: #e7e9ec;
    --color-line-soft: #f1f2f4;
    --color-surface: #f6f7f8;
    --color-accent: #1a3a5c;
    --color-accent-light: #244e7a;
    --color-on-accent: #ffffff;
    --color-on-accent-mute: #a8b8cc;

    --font-jp: "Yu Gothic Medium", "游ゴシック Medium", YuGothic, "游ゴシック体",
               "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro",
               "Noto Sans JP", "Noto Sans CJK JP",
               "メイリオ", Meiryo, sans-serif;
    --font-num: "Helvetica Neue", Helvetica, Arial, "Yu Gothic Medium", sans-serif;

    --max-w: 1200px;
    --pad-x: 32px;
  }

  body {
    font-family: var(--font-jp);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.85;
    font-size: 16px;
    font-feature-settings: "palt";
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  .container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding-left: var(--pad-x);
    padding-right: var(--pad-x);
  }

  /* ==============================================================
     Header — thin, modern
  =============================================================== */
  .site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--color-line);
  }
  .site-header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 80px;
  }
  .brand { display: flex; align-items: center; gap: 14px; }
  .brand-mark {
    width: 48px; height: 40px;
    display: inline-flex; align-items: center; justify-content: center;
    background: #fff;
    border-radius: 2px;
    overflow: hidden;
    flex-shrink: 0;
  }
  .brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
  }
  .brand-name { display: flex; flex-direction: column; line-height: 1.2; }
  .brand-name .ja { font-size: 15px; font-weight: 600; letter-spacing: 0.05em; }
  .brand-name .en {
    font-family: var(--font-num);
    font-size: 10px; color: var(--color-text-mute);
    letter-spacing: 0.28em; margin-top: 4px;
  }

  .nav ul { display: flex; gap: 32px; align-items: center; }
  .nav a {
    font-size: 13px;
    letter-spacing: 0.06em;
    padding: 6px 0;
    position: relative;
    transition: color 0.2s ease;
  }
  .nav a::after {
    content: ""; position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 1px; background: var(--color-accent);
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.25s ease;
  }
  .nav a:hover { color: var(--color-accent); }
  .nav a:hover::after { transform: scaleX(1); }

  .nav-toggle {
    display: none;
    background: none; border: 1px solid var(--color-line);
    width: 42px; height: 42px; padding: 0;
    cursor: pointer; position: relative; border-radius: 2px;
  }
  .nav-toggle span,
  .nav-toggle span::before,
  .nav-toggle span::after {
    content: ""; position: absolute; left: 50%;
    width: 20px; height: 1.5px; background: var(--color-text);
    transform: translateX(-50%);
  }
  .nav-toggle span { top: 50%; transform: translate(-50%, -50%); }
  .nav-toggle span::before { top: -7px; left: 0; transform: none; }
  .nav-toggle span::after  { top:  7px; left: 0; transform: none; }

  /* ==============================================================
     Hero — asymmetric split
  =============================================================== */
  .hero {
    padding: 0;
    position: relative;
  }
  .hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    min-height: calc(100vh - 80px);
    align-items: stretch;
  }
  .hero-copy {
    padding: 96px 0 96px;
    padding-right: 56px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
  }
  .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.25em;
    color: var(--color-accent);
    font-weight: 600;
  }
  .hero-tag::before {
    content: ""; width: 32px; height: 1px;
    background: var(--color-accent);
    display: inline-block;
  }
  .hero-copy h1 {
    font-size: clamp(36px, 4.5vw, 64px);
    line-height: 1.45;
    letter-spacing: 0.03em;
    font-weight: 700;
    margin: 0 0 32px;
  }
  .hero-copy h1 .nl { display: block; }
  .hero-copy h1 em {
    font-style: normal;
    color: var(--color-accent);
  }
  .hero-copy p {
    color: var(--color-text-sub);
    font-size: 16px;
    max-width: 520px;
    margin: 0 0 48px;
  }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 1px solid var(--color-line);
    padding-top: 28px;
    max-width: 540px;
  }
  .hero-stats > div {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-right: 16px;
  }
  .hero-stats .label {
    font-family: var(--font-num);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--color-text-mute);
    font-weight: 600;
  }
  .hero-stats .value {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.04em;
  }

  .hero-visual {
    position: relative;
    background: #1c1c1e;
    border-left: 1px solid var(--color-line);
    overflow: hidden;
  }
  .slideshow {
    position: absolute;
    inset: 0;
  }
  .slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    animation: heroFade 21s infinite cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity;
  }
  .slide:nth-child(1) { animation-delay: -1.75s; }
  .slide:nth-child(2) { animation-delay:  1.75s; }
  .slide:nth-child(3) { animation-delay:  5.25s; }
  .slide:nth-child(4) { animation-delay:  8.75s; }
  .slide:nth-child(5) { animation-delay: 12.25s; }
  .slide:nth-child(6) { animation-delay: 15.75s; }
  @keyframes heroFade {
    0%, 100%       { opacity: 0; }
    8%, 16.67%     { opacity: 1; }
    24.67%         { opacity: 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    .slide { animation: none; }
    .slide.is-active { opacity: 1; }
  }

  /* ==============================================================
     Section — two-column head (left index, right body)
  =============================================================== */
  .section {
    padding: 128px 0;
    border-top: 1px solid var(--color-line);
  }
  .section-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 64px;
  }
  .section-head {
    position: sticky;
    top: 112px;
    align-self: start;
  }
  .section-index {
    font-family: var(--font-num);
    font-size: 13px;
    letter-spacing: 0.22em;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .section-index::before {
    content: ""; width: 28px; height: 1px;
    background: var(--color-accent);
  }
  .section-title {
    font-size: 40px;
    font-weight: 700;
    margin: 0 0 16px;
    letter-spacing: 0.04em;
    line-height: 1.35;
  }
  .section-title .en {
    display: block;
    font-family: var(--font-num);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--color-text-mute);
    margin-top: 12px;
  }
  .section-lead {
    margin-top: 16px;
    color: var(--color-text-sub);
    font-size: 14px;
  }

  /* Services */
  .services {
    display: flex;
    flex-direction: column;
    gap: 0;
  }
  .service-row {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 32px;
    padding: 36px 0;
    border-top: 1px solid var(--color-line);
    align-items: start;
  }
  .service-row:last-child { border-bottom: 1px solid var(--color-line); }
  .service-row .num {
    font-family: var(--font-num);
    font-size: 36px;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
    letter-spacing: 0.02em;
  }
  .service-row h3 {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 12px;
    letter-spacing: 0.04em;
    line-height: 1.5;
  }
  .service-row p {
    margin: 0;
    color: var(--color-text-sub);
    font-size: 15px;
    line-height: 1.95;
    max-width: 640px;
  }

  /* Strengths */
  .strengths-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .strength-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 32px;
    padding: 32px 0;
    border-top: 1px solid var(--color-line);
    align-items: start;
  }
  .strength-row:last-child { border-bottom: 1px solid var(--color-line); }
  .strength-row .num {
    font-family: var(--font-num);
    font-size: 12px;
    letter-spacing: 0.25em;
    color: var(--color-accent);
    font-weight: 700;
    padding-top: 8px;
  }
  .strength-row h3 {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 12px;
    letter-spacing: 0.04em;
    line-height: 1.5;
  }
  .strength-row p {
    margin: 0;
    color: var(--color-text-sub);
    font-size: 15px;
    line-height: 1.95;
    max-width: 640px;
  }

  /* Company table — modern */
  .company-table {
    width: 100%;
    border-collapse: collapse;
  }
  .company-table tr {
    border-top: 1px solid var(--color-line);
  }
  .company-table tr:last-child { border-bottom: 1px solid var(--color-line); }
  .company-table th,
  .company-table td {
    text-align: left;
    padding: 24px 0;
    font-size: 15px;
    vertical-align: top;
  }
  .company-table th {
    width: 180px;
    font-weight: 600;
    color: var(--color-text-mute);
    letter-spacing: 0.05em;
    font-size: 13px;
    padding-top: 28px;
  }
  .company-table td {
    color: var(--color-text);
    line-height: 1.85;
  }
  .company-table td strong { font-weight: 700; }
  .company-table .en-name {
    display: block;
    margin-top: 4px;
    font-family: var(--font-num);
    font-size: 12px;
    letter-spacing: 0.22em;
    color: var(--color-text-mute);
    font-weight: 600;
  }

  /* Products */
  .products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 32px;
    row-gap: 0;
    margin: 0;
    padding: 0;
    list-style: none;
  }
  .product-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 22px 0;
    border-top: 1px solid var(--color-line);
  }
  .product-card:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--color-line);
  }
  .product-card .num {
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.25em;
    color: var(--color-accent);
    font-weight: 700;
    min-width: 28px;
  }
  .product-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 0;
    letter-spacing: 0.04em;
    line-height: 1.5;
  }

  /* History */
  .history-list {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  .history-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 32px;
    padding: 32px 0;
    border-top: 1px solid var(--color-line);
    align-items: start;
  }
  .history-row:last-child { border-bottom: 1px solid var(--color-line); }
  .history-row .year {
    font-family: var(--font-num);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.03em;
    line-height: 1;
    padding-top: 6px;
    display: inline-flex;
    align-items: baseline;
  }
  .history-row .year .month {
    font-size: 12px;
    margin-left: 4px;
    color: var(--color-text-mute);
    letter-spacing: 0.1em;
    font-weight: 600;
  }
  .history-row h3 {
    font-size: 19px;
    font-weight: 700;
    margin: 0 0 10px;
    letter-spacing: 0.04em;
    line-height: 1.5;
  }
  .history-row p {
    margin: 0;
    color: var(--color-text-sub);
    font-size: 14.5px;
    line-height: 1.95;
    max-width: 640px;
  }

  /* ==============================================================
     Access — dark navy band
  =============================================================== */
  .access {
    background: var(--color-accent);
    color: var(--color-on-accent);
    border-top: 0;
  }
  .access .section-index { color: var(--color-on-accent-mute); }
  .access .section-index::before { background: var(--color-on-accent-mute); }
  .access .section-title { color: #fff; }
  .access .section-title .en { color: var(--color-on-accent-mute); }
  .access .section-lead { color: var(--color-on-accent-mute); }

  .access-body {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: stretch;
  }
  .map-embed {
    width: 100%;
    min-height: 420px;
    border: 1px solid var(--color-accent-light);
    display: block;
    background: var(--color-accent-light);
  }

  .access-info {
    display: flex; flex-direction: column;
    justify-content: center; gap: 8px;
  }
  .access-info dl {
    margin: 0;
    display: flex;
    flex-direction: column;
  }
  .access-info .row {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 24px;
    padding: 22px 0;
    border-top: 1px solid var(--color-accent-light);
    align-items: start;
  }
  .access-info .row:last-child { border-bottom: 1px solid var(--color-accent-light); }
  .access-info dt {
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--color-on-accent-mute);
    font-weight: 700;
    padding-top: 4px;
    margin: 0;
  }
  .access-info dd {
    margin: 0;
    font-size: 15px;
    color: #fff;
    line-height: 1.85;
  }
  .access-info dd .sub {
    display: block;
    font-size: 12px;
    color: var(--color-on-accent-mute);
    margin-top: 4px;
  }
  .access-info dd a {
    color: #fff;
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.35);
    padding-bottom: 2px;
    transition: border-color 0.2s ease;
  }
  .access-info dd a:hover {
    border-bottom-color: #fff;
  }

  /* Footer */
  .site-footer {
    background: #0f2540;
    color: #fff;
    padding: 48px 0 32px;
  }
  .site-footer-inner {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 16px;
  }
  .site-footer .brand-mark {
    background: #fff;
    border: 1px solid rgba(255,255,255,0.18);
  }
  .site-footer .brand-name .ja { color: #fff; font-size: 13px; }
  .site-footer .brand-name .en { color: rgba(255,255,255,0.5); }
  .site-footer .copyright {
    font-family: var(--font-num);
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.15em;
  }

  /* ==============================================================
     Responsive
  =============================================================== */
  @media (max-width: 980px) {
    :root { --pad-x: 20px; }

    .hero-grid {
      grid-template-columns: 1fr;
      min-height: auto;
    }
    .hero-copy {
      padding: 64px 0 56px;
      padding-right: 0;
    }
    .hero-copy h1 { font-size: clamp(32px, 7vw, 44px); }
    .hero-stats {
      grid-template-columns: 1fr 1fr;
      gap: 18px 16px;
    }
    .hero-stats > div { padding-right: 0; }
    .hero-visual {
      min-height: 60vh;
      border-left: 0;
      border-top: 1px solid var(--color-line);
    }

    .section { padding: 80px 0; }
    .section-grid { grid-template-columns: 1fr; gap: 40px; }
    .section-head { position: static; }
    .section-title { font-size: 30px; }

    .service-row { grid-template-columns: 56px 1fr; gap: 20px; padding: 28px 0; }
    .service-row .num { font-size: 26px; }
    .service-row h3 { font-size: 19px; }

    .strength-row { grid-template-columns: 1fr; gap: 8px; padding: 26px 0; }
    .strength-row .num { padding-top: 0; }
    .strength-row h3 { font-size: 19px; }

    .products-grid { grid-template-columns: 1fr; column-gap: 0; }
    .product-card:nth-last-child(-n+2) { border-bottom: 0; }
    .product-card:last-child { border-bottom: 1px solid var(--color-line); }

    .history-row { grid-template-columns: 1fr; gap: 10px; padding: 26px 0; }
    .history-row .year { padding-top: 0; font-size: 22px; }
    .history-row h3 { font-size: 18px; }

    .company-table th,
    .company-table td { display: block; width: 100%; padding: 8px 0; }
    .company-table tr { padding: 16px 0; }
    .company-table th { padding-top: 16px; }
    .company-table td { padding-bottom: 16px; }

    .access-body { grid-template-columns: 1fr; gap: 32px; }

    .nav { display: none; }
    .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
    .nav.is-open {
      display: block; position: absolute;
      top: 80px; left: 0; right: 0;
      background: #fff; border-bottom: 1px solid var(--color-line);
      padding: 16px var(--pad-x) 24px;
    }
    .nav.is-open ul { flex-direction: column; gap: 4px; align-items: stretch; }
    .nav.is-open a {
      display: block; padding: 14px 0;
      border-bottom: 1px solid var(--color-line-soft);
    }
  }