:root {
        --ink: #111111;
        --ink-2: #1b1b1b;
        --text: #4f4f4f;
        --muted: #727272;
        --line: #e1e1e1;
        --line-strong: #c9c9c9;
        --paper: #ffffff;
        --paper-2: #fcfcfc;
        --soft: #f7f7f7;
        --soft-2: #efefef;
        --orange: #f57e35;
        --orange-dark: #b64b10;
        --blue: #0d6fc2;
        --max: 1200px;
        --gutter: 32px;
        --duration: 240ms;
        --ease: cubic-bezier(0.2, 0, 0, 1);
      }

      * { box-sizing: border-box; }

      html, body {
        max-width: 100%;
        overflow-x: hidden;
      }

      body {
        margin: 0;
        color: var(--text);
        background: var(--paper);
        font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
        font-weight: 500;
        line-height: 1.75;
        letter-spacing: 0;
      }

      a { color: inherit; text-decoration: none; }
      img { max-width: 100%; display: block; }

      /* CJK no-break for clean wrap points */
      .nobr { display: inline; white-space: nowrap; }

      .container {
        max-width: var(--max);
        margin: 0 auto;
        padding: 0 var(--gutter);
      }

      /* ====== Header (bilingual, matches TOP mockup) ====== */
      .site-header {
        position: sticky;
        top: 0;
        z-index: 50;
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: saturate(180%) blur(10px);
        -webkit-backdrop-filter: saturate(180%) blur(10px);
        border-bottom: 1px solid var(--line);
      }

      .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        max-width: 1280px;
        margin: 0 auto;
        padding: 14px var(--gutter);
      }

      .brand { display: inline-flex; align-items: center; }
      .brand img { height: 22px; width: auto; }

      .global-nav {
        display: flex;
        align-items: stretch;
        gap: 28px;
        color: var(--ink);
      }

      .global-nav a {
        position: relative;
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        padding: 6px 2px;
        color: var(--ink);
      }

      .global-nav .nav-en {
        font-size: 14px;
        font-weight: 800;
        letter-spacing: 0.08em;
        line-height: 1.15;
        text-transform: uppercase;
        transition: color var(--duration) var(--ease);
      }

      .global-nav .nav-ja {
        font-size: 10.5px;
        font-weight: 500;
        letter-spacing: 0.04em;
        line-height: 1.2;
        color: var(--muted);
        transition: color var(--duration) var(--ease);
      }

      .global-nav a::after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: -2px;
        width: 0;
        height: 2px;
        background: var(--orange);
        transform: translateX(-50%);
        transition: width var(--duration) var(--ease);
      }

      .global-nav a:hover::after,
      .global-nav .is-current::after {
        width: 100%;
      }

      .global-nav a:hover .nav-en,
      .global-nav .is-current .nav-en {
        color: var(--orange);
      }

      .global-nav a:hover .nav-ja {
        color: var(--ink);
      }

      .header-actions { display: flex; align-items: center; gap: 12px; }

      .header-contact {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        min-height: 52px;
        padding: 0 22px;
        background: var(--ink);
        color: #ffffff;
        transition: background var(--duration) var(--ease);
      }

      .header-contact .nav-en {
        font-size: 13px;
        font-weight: 800;
        letter-spacing: 0.1em;
        line-height: 1.15;
        text-transform: uppercase;
      }

      .header-contact .nav-ja {
        font-size: 10px;
        font-weight: 500;
        letter-spacing: 0.04em;
        line-height: 1.2;
        color: rgba(255, 255, 255, 0.7);
      }

      .header-contact:hover { background: var(--orange); }
      .header-contact:hover .nav-ja { color: rgba(255, 255, 255, 0.9); }

      .menu-toggle {
        display: none;
        width: 40px;
        height: 40px;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: 1px solid var(--line);
        cursor: pointer;
      }

      .menu-toggle span,
      .menu-toggle span::before,
      .menu-toggle span::after {
        content: "";
        display: block;
        width: 18px;
        height: 2px;
        background: var(--ink);
        position: relative;
      }
      .menu-toggle span::before { position: absolute; top: -6px; }
      .menu-toggle span::after { position: absolute; top: 6px; }

      /* ====== Page hero ====== */
      .page-hero {
        position: relative;
        min-height: 560px;
        color: #ffffff;
        overflow: hidden;
        isolation: isolate;
      }

      .page-hero::before {
        content: "";
        position: absolute;
        inset: 0;
        background-image: url("/assets/images/service/service-hero-business-portfolio.png");
        background-size: cover;
        background-position: center right;
        z-index: -2;
      }

      .page-hero::after {
        content: "";
        position: absolute;
        inset: 0;
        background:
          linear-gradient(90deg, rgba(7, 12, 22, 0.92) 0%, rgba(7, 12, 22, 0.78) 30%, rgba(7, 12, 22, 0.34) 64%, rgba(7, 12, 22, 0.62) 100%),
          linear-gradient(180deg, rgba(7, 12, 22, 0.18) 0%, rgba(7, 12, 22, 0.55) 100%);
        z-index: -1;
      }

      .page-hero-inner {
        position: relative;
        display: grid;
        grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
        gap: 56px;
        align-items: end;
        max-width: var(--max);
        margin: 0 auto;
        padding: 110px var(--gutter) 80px;
      }

      .page-hero-text {
        align-self: center;
      }

      .eyebrow {
        margin: 0 0 18px;
        color: var(--orange);
        font-size: 12px;
        font-weight: 900;
        letter-spacing: 0.18em;
        text-transform: uppercase;
      }

      .page-hero .eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        color: rgba(255, 255, 255, 0.92);
        letter-spacing: 0.22em;
      }

      .page-hero .eyebrow::before {
        content: "";
        display: inline-block;
        width: 36px;
        height: 1px;
        background: var(--orange);
      }

      .page-hero h1 {
        margin: 0 0 26px;
        color: #ffffff;
        font-size: clamp(44px, 6vw, 76px);
        font-weight: 900;
        line-height: 1.06;
        letter-spacing: -0.01em;
        text-shadow: 0 2px 30px rgba(0, 0, 0, 0.35);
      }

      .page-hero h1 small {
        display: block;
        margin-top: 14px;
        color: rgba(255, 255, 255, 0.78);
        font-size: clamp(15px, 1.2vw, 17px);
        font-weight: 700;
        letter-spacing: 0.04em;
        line-height: 1.7;
        text-shadow: none;
      }

      .page-hero .lead {
        margin: 0;
        max-width: 560px;
        color: rgba(255, 255, 255, 0.88);
        font-size: 16px;
        font-weight: 500;
        line-height: 1.95;
      }

      .hero-aside {
        align-self: end;
        display: flex;
        flex-direction: column;
        gap: 18px;
      }

      .hero-index {
        display: grid;
        gap: 0;
        border: 1px solid rgba(255, 255, 255, 0.28);
        background: rgba(10, 14, 22, 0.42);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
      }

      .hero-index a {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 18px;
        min-height: 60px;
        padding: 14px 18px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.18);
        color: #ffffff;
        font-size: 14px;
        font-weight: 800;
        transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
      }

      .hero-index a:last-child { border-bottom: 0; }

      .hero-index a:hover {
        background: rgba(255, 255, 255, 0.96);
        color: var(--ink);
      }

      .hero-index .arrow {
        font-weight: 700;
        font-size: 16px;
        color: var(--orange);
      }

      /* ====== Sections ====== */
      .section {
        position: relative;
        padding: 110px 0;
        border-bottom: 1px solid var(--line);
      }

      .section-alt { background: var(--soft); }

      .section-head {
        display: grid;
        grid-template-columns: 0.92fr 1.08fr;
        gap: 48px;
        margin-bottom: 56px;
      }

      .section-head h2 {
        margin: 0;
        color: var(--ink);
        font-size: clamp(30px, 3.6vw, 46px);
        font-weight: 900;
        line-height: 1.22;
        letter-spacing: -0.005em;
      }

      .section-head .summary {
        margin: 0;
        color: var(--text);
        font-size: 16px;
        font-weight: 500;
        line-height: 1.95;
      }

      /* ====== Concept (value grid) ====== */
      .value-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0;
        border-top: 1px solid var(--ink);
        border-left: 1px solid var(--line);
      }

      .value-card {
        display: flex;
        flex-direction: column;
        min-height: 240px;
        padding: 30px 26px;
        border-right: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
        background: var(--paper);
      }

      .value-card .num {
        display: block;
        margin-bottom: 24px;
        color: var(--muted);
        font-size: 13px;
        font-weight: 900;
        letter-spacing: 0.08em;
      }

      .value-card h3 {
        margin: 0 0 12px;
        color: var(--ink);
        font-size: 20px;
        font-weight: 900;
        line-height: 1.4;
      }

      .value-card p {
        margin: 0;
        color: var(--text);
        font-size: 14px;
        line-height: 1.85;
      }

      /* ====== Portfolio (business cards) ====== */
      .portfolio {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 28px;
      }

      .business-card {
        position: relative;
        display: flex;
        flex-direction: column;
        background: var(--paper);
        border: 1px solid var(--line);
        overflow: hidden;
        transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
      }

      .business-card:hover {
        border-color: var(--line-strong);
        box-shadow: 0 12px 36px -22px rgba(0,0,0,0.18);
      }

      .business-thumb {
        position: relative;
        aspect-ratio: 16 / 7;
        background: #1a1a1a;
        overflow: hidden;
      }

      .business-thumb img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        opacity: 0.92;
      }

      .business-thumb::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, rgba(10,12,16,0.05) 0%, rgba(10,12,16,0.55) 100%);
      }

      .business-thumb .meta {
        position: absolute;
        left: 22px;
        bottom: 18px;
        right: 22px;
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 16px;
        color: #ffffff;
        z-index: 1;
      }

      .business-thumb .num {
        font-size: 28px;
        font-weight: 900;
        line-height: 1;
        letter-spacing: 0;
      }

      .business-thumb .label-en {
        font-size: 11px;
        font-weight: 800;
        letter-spacing: 0.16em;
        text-transform: uppercase;
        color: var(--orange);
      }

      .business-body {
        display: flex;
        flex-direction: column;
        gap: 16px;
        padding: 26px 28px 24px;
        flex: 1;
      }

      .business-body h3 {
        margin: 0;
        color: var(--ink);
        font-size: 22px;
        font-weight: 900;
        line-height: 1.4;
      }

      .business-body .desc {
        margin: 0;
        color: var(--text);
        font-size: 14.5px;
        line-height: 1.95;
      }

      .business-points {
        list-style: none;
        margin: 0;
        padding: 0;
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }

      .business-points li {
        padding: 6px 12px;
        border: 1px solid var(--line);
        background: var(--soft);
        color: var(--muted);
        font-size: 12px;
        font-weight: 700;
        letter-spacing: 0.02em;
      }

      .business-links {
        display: grid;
        grid-template-columns: 1fr;
        gap: 8px;
        margin-top: auto;
        padding-top: 18px;
        border-top: 1px solid var(--line);
      }

      .business-link-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 14px;
        min-height: 52px;
        padding: 10px 16px 10px 18px;
        color: var(--ink);
        background: var(--paper);
        border: 1px solid var(--line);
        transition: background var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease);
      }

      .business-link-item:hover {
        background: var(--ink);
        border-color: var(--ink);
        color: #ffffff;
      }

      .business-link-item strong {
        font-size: 14px;
        font-weight: 800;
        letter-spacing: 0.01em;
        line-height: 1.4;
      }

      .business-link-item .cta-text {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 12px;
        font-weight: 800;
        letter-spacing: 0.04em;
        white-space: nowrap;
        color: var(--muted);
        transition: color var(--duration) var(--ease);
      }

      .business-link-item:hover .cta-text {
        color: #ffffff;
      }

      .business-link-item .arrow {
        display: inline-block;
        transition: transform var(--duration) var(--ease);
      }

      .business-link-item:hover .arrow {
        transform: translateX(3px);
      }

      /* ====== Growth ====== */
      .growth-chain {
        position: relative;
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 28px;
        padding-top: 6px;
      }

      .growth-chain::before {
        content: "";
        position: absolute;
        top: 34px;
        left: 28px;
        right: 28px;
        height: 1px;
        background: repeating-linear-gradient(90deg, var(--line-strong) 0 6px, transparent 6px 12px);
        z-index: 0;
      }

      .growth-node {
        position: relative;
        display: flex;
        flex-direction: column;
        gap: 18px;
        z-index: 1;
      }

      .growth-node-marker {
        position: relative;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 64px;
        height: 64px;
        margin-left: -2px;
        border-radius: 50%;
        background: var(--paper);
        border: 1.5px solid var(--orange);
        color: var(--ink);
        font-size: 17px;
        font-weight: 900;
        letter-spacing: 0.02em;
      }

      .growth-node-marker::after {
        content: "";
        position: absolute;
        inset: 6px;
        border-radius: 50%;
        border: 1px solid rgba(245, 126, 53, 0.22);
      }

      .growth-node-body {
        display: flex;
        flex-direction: column;
        gap: 10px;
        padding-right: 10px;
      }

      .growth-node .label {
        color: var(--orange);
        font-size: 12px;
        font-weight: 900;
        letter-spacing: 0.16em;
      }

      .growth-node h3 {
        margin: 0;
        color: var(--ink);
        font-size: 20px;
        font-weight: 900;
        line-height: 1.4;
      }

      .growth-node p {
        margin: 0;
        color: var(--text);
        font-size: 14px;
        line-height: 1.9;
      }

      /* Shared contact CTA layout is loaded from /shared-contact-cta.css. */
      .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        min-height: 60px;
        padding: 0 28px;
        font-size: 15px;
        font-weight: 800;
        letter-spacing: 0.02em;
        transition: background var(--duration) var(--ease), color var(--duration) var(--ease), border-color var(--duration) var(--ease);
      }

      .button.primary-light {
        background: #ffffff;
        color: var(--ink);
      }

      .button.primary-light:hover {
        background: var(--orange);
        color: #ffffff;
      }

      .button .arrow {
        display: inline-block;
        transition: transform var(--duration) var(--ease);
      }

      .button:hover .arrow {
        transform: translateX(3px);
      }

      /* ====== Footer ====== */
      .footer {
        background: #0b0b0c;
        color: #c9c9c9;
        padding: 64px 0 32px;
      }

      .footer-top {
        display: grid;
        grid-template-columns: 1.3fr repeat(4, 1fr);
        gap: 36px;
        padding-bottom: 40px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.12);
      }

      .footer-brand .footer-logo {
        display: inline-flex;
        align-items: center;
        margin-bottom: 18px;
      }

      .footer-brand .footer-logo img {
        height: 24px;
        width: auto;
      }

      .footer-brand p {
        color: rgba(255, 255, 255, 0.6);
        font-size: 13px;
        line-height: 1.85;
      }

      .footer-col strong {
        display: block;
        margin-bottom: 14px;
        color: #ffffff;
        font-size: 13px;
        font-weight: 800;
        letter-spacing: 0.08em;
      }

      .footer-col a {
        display: block;
        margin-top: 8px;
        color: rgba(255, 255, 255, 0.62);
        font-size: 13px;
        transition: color var(--duration) var(--ease);
      }

      .footer-col a:hover { color: var(--orange); }

      .footer-bottom {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        padding-top: 24px;
        color: rgba(255, 255, 255, 0.4);
        font-size: 12px;
      }

      /* ====== Responsive ====== */
      @media (max-width: 1366px) {
        .section { padding: 96px 0; }
        .portfolio { gap: 24px; }
        .business-body { padding: 24px 24px 22px; }
        .business-body h3 { font-size: 21px; }
        .value-card { min-height: 220px; padding: 26px 22px; }
        .page-hero-inner { padding: 88px var(--gutter) 72px; gap: 48px; }
      }

      @media (max-width: 1100px) {
        .section-head {
          grid-template-columns: 1fr;
          gap: 18px;
          margin-bottom: 44px;
        }
        .value-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
        .growth-chain { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 28px; }
        .growth-chain::before { display: none; }
        .page-hero-inner {
          grid-template-columns: 1fr;
          gap: 44px;
        }
        .hero-aside { align-self: stretch; }
      }

      @media (max-width: 960px) {
        :root { --gutter: 24px; }
        .global-nav,
        .header-contact { display: none; }
        .menu-toggle { display: inline-flex; }
        .section { padding: 80px 0; }
        .page-hero-inner { padding: 72px var(--gutter) 60px; }
        .portfolio { grid-template-columns: 1fr; gap: 22px; }
      }

      @media (max-width: 720px) {
        .section { padding: 64px 0; }
        .page-hero-inner { padding: 56px var(--gutter) 44px; }
        .page-hero h1 { font-size: 44px; }
        .section-head h2 { font-size: 28px; }
        .value-grid { grid-template-columns: 1fr; }
        .growth-chain { grid-template-columns: 1fr; gap: 28px; }
        .footer-top {
          grid-template-columns: 1fr 1fr;
          gap: 28px;
        }
        .footer-brand { grid-column: 1 / -1; }
        .business-thumb { aspect-ratio: 16 / 8; }
        .business-thumb .num { font-size: 24px; }
        .business-body { padding: 22px 20px 20px; }
        .business-body h3 { font-size: 19px; }
        .button { min-height: 56px; font-size: 14.5px; padding: 0 22px; }
      }

      @media (max-width: 560px) {
        .business-link-item {
          flex-direction: column;
          align-items: stretch;
          gap: 6px;
          padding: 14px 16px;
          min-height: 0;
        }
        .business-link-item .cta-text {
          justify-content: flex-end;
        }
      }

      @media (max-width: 480px) {
        .footer-top { grid-template-columns: 1fr; }
        .footer-bottom { flex-direction: column; gap: 8px; }
        .hero-index a { font-size: 13px; padding: 12px 16px; min-height: 54px; }
        .business-link-item strong { font-size: 13.5px; }
        .business-link-item .cta-text { font-size: 11.5px; }
      }