:root {
      --bg: #eef8ff;
      --bg-2: #dff2ff;
      --surface: rgba(255,255,255,.78);
      --surface-strong: rgba(255,255,255,.92);
      --line: rgba(74, 155, 255, .14);
      --text: #0d2745;
      --muted: #58738f;
      --accent: #00a8db;
      --accent-2: #5d8bff;
      --accent-3: #4fd1c7;
      --shadow: 0 20px 60px rgba(65, 116, 168, .14);
      --radius: 24px;
      --max: 1180px;
      --header-h: 76px;
      --hero-dark: #0f2844;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Aptos", "Segoe UI Variable", "Noto Sans JP", "Hiragino Sans", sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at top left, rgba(93,139,255,.18), transparent 28%),
        radial-gradient(circle at 85% 10%, rgba(0,168,219,.16), transparent 22%),
        linear-gradient(180deg, #f7fcff 0%, var(--bg) 42%, #f4fbff 100%);
      line-height: 1.65;
      min-width: 320px;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      background-image:
        linear-gradient(rgba(88,115,143,.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(88,115,143,.045) 1px, transparent 1px);
      background-size: 46px 46px;
      pointer-events: none;
      z-index: -1;
    }

    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; }
    button { font: inherit; }
    .wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 30;
      backdrop-filter: blur(18px);
      background: rgba(247,252,255,.8);
      border-bottom: 1px solid rgba(93,139,255,.1);
    }

    .site-header .wrap {
      min-height: var(--header-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 14px;
      font-weight: 700;
      letter-spacing: .03em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      box-shadow: 0 10px 24px rgba(0,168,219,.18);
      position: relative;
      overflow: hidden;
    }

    .brand-mark::before,
    .brand-mark::after {
      content: "";
      position: absolute;
      border-radius: 50%;
      background: rgba(255,255,255,.72);
    }

    .brand-mark::before { width: 10px; height: 10px; top: 8px; left: 8px; }
    .brand-mark::after { width: 18px; height: 18px; right: 6px; bottom: 6px; opacity: .35; }

    .brand-copy { display: flex; flex-direction: column; line-height: 1.08; }
    .brand-copy small,
    .eyebrow,
    .section-label,
    .mini,
    .tag,
    .stat-label {
      text-transform: uppercase;
      letter-spacing: .16em;
      font-size: .74rem;
    }

    .brand-copy small { color: var(--muted); margin-bottom: 6px; }

    .nav {
      display: flex;
      align-items: center;
      gap: 22px;
      color: var(--muted);
      font-size: .95rem;
    }

    .nav a:hover,
    .nav a:focus-visible { color: var(--text); }

    .header-cta,
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 999px;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }

    .header-cta {
      min-height: 48px;
      padding: 0 18px;
      border: 1px solid rgba(0,168,219,.16);
      background: rgba(255,255,255,.86);
      box-shadow: 0 8px 20px rgba(93,139,255,.08);
    }

    .header-cta:hover,
    .button:hover,
    .button:focus-visible { transform: translateY(-2px); }

    .menu-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border-radius: 14px;
      border: 1px solid rgba(93,139,255,.12);
      background: rgba(255,255,255,.86);
      color: var(--text);
    }

    .hero {
      padding: 42px 0 30px;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.02fr .98fr;
      align-items: center;
      gap: 42px;
      min-height: calc(100vh - var(--header-h) - 34px);
    }

    .eyebrow {
      color: var(--accent);
      display: inline-block;
      margin-bottom: 18px;
    }

    .hero h1 {
      margin: 0 0 20px;
      font-size: clamp(2.8rem, 5vw, 5.6rem);
      line-height: .98;
      letter-spacing: -.05em;
      max-width: 10ch;
    }

    .hero p,
    .lead,
    .card p,
    .use-case p,
    .about-card p,
    .contact-card p,
    .visual-copy p {
      color: var(--muted);
    }

    .hero p { margin: 0; max-width: 700px; font-size: clamp(1rem, 1.3vw, 1.16rem); }

    .hero-actions,
    .contact-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 32px;
    }

    .button {
      min-height: 52px;
      padding: 0 22px;
      border: 1px solid transparent;
    }

    .button.primary {
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      color: white;
      font-weight: 700;
      box-shadow: 0 14px 28px rgba(0,168,219,.22);
    }

    .button.secondary {
      border-color: rgba(93,139,255,.15);
      background: rgba(255,255,255,.8);
      color: var(--text);
    }

    .hero-meta {
      display: grid;
      grid-template-columns: repeat(3, minmax(0,1fr));
      gap: 14px;
      margin-top: 36px;
    }

    .stat,
    .card,
    .panel,
    .use-case,
    .about-card,
    .contact-card,
    .compare-card,
    .deliverable,
    .visual-card,
    .placeholder-card {
      border-radius: var(--radius);
      background: var(--surface);
      border: 1px solid rgba(93,139,255,.12);
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .stat { padding: 18px; }
    .stat strong { display: block; margin-top: 10px; font-size: 1.2rem; }

    .hero-visual {
      min-height: 620px;
      border-radius: 34px;
      padding: 24px;
      background:
        radial-gradient(circle at top left, rgba(95,214,255,.18), transparent 24%),
        radial-gradient(circle at 85% 18%, rgba(124,141,255,.22), transparent 26%),
        linear-gradient(160deg, #16355a 0%, var(--hero-dark) 68%, #14314f 100%);
      color: white;
      border: 1px solid rgba(255,255,255,.12);
      box-shadow: 0 24px 64px rgba(16, 44, 78, .26);
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: auto 1fr auto;
      gap: 16px;
    }

    .hero-badge,
    .hero-note,
    .hero-image,
    .hero-abstract {
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,.12);
      background: rgba(255,255,255,.08);
      overflow: hidden;
      backdrop-filter: blur(14px);
    }

    .hero-badge,
    .hero-note { padding: 18px; }

    .hero-badge strong,
    .hero-note strong { display: block; margin-bottom: 8px; }

    .hero-image img,
    .visual-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .hero-image.main { grid-column: 1 / span 2; min-height: 260px; }
    .hero-image.side { min-height: 170px; }

    .hero-abstract {
      min-height: 170px;
      padding: 18px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 12px;
      background:
        linear-gradient(135deg, rgba(8,40,74,.42), rgba(20,58,98,.28)),
        url('image/abstract_tech_lines.jpg') center/cover;
      position: relative;
    }

    .hero-abstract::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(9,30,54,.18), rgba(9,30,54,.52));
    }

    .hero-abstract > * {
      position: relative;
      z-index: 1;
    }

    .hero-abstract-copy strong {
      display: block;
      margin-bottom: 8px;
      font-size: 1rem;
      color: rgba(255,255,255,.96);
    }

    .hero-abstract-copy p {
      margin: 0;
      color: rgba(255,255,255,.82);
      font-size: .92rem;
      line-height: 1.55;
    }

    .hero-abstract-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .hero-abstract-tags span {
      display: inline-flex;
      align-items: center;
      padding: 7px 10px;
      border-radius: 999px;
      background: rgba(255,255,255,.12);
      border: 1px solid rgba(255,255,255,.14);
      color: rgba(255,255,255,.9);
      font-size: .76rem;
      letter-spacing: .06em;
    }

    .section { padding: 48px 0; }

    .section-header {
      display: grid;
      gap: 14px;
      max-width: 760px;
      margin-bottom: 28px;
    }

    .section-label { color: var(--accent); }
    .section h2 { margin: 0; font-size: clamp(2rem, 3vw, 3rem); line-height: 1.05; letter-spacing: -.04em; }
    .lead { margin: 0; }

    .visual-band {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 18px;
      margin-top: 10px;
    }

    .visual-card { min-height: 320px; }
    .visual-card.tall { min-height: 420px; }
    .visual-copy {
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 18px;
      padding: 18px;
      border-radius: 20px;
      background: rgba(255,255,255,.86);
      backdrop-filter: blur(12px);
    }

    .placeholder-stack {
      display: grid;
      gap: 18px;
    }

    .placeholder-card {
      min-height: 200px;
      display: grid;
      place-items: center;
      background:
        linear-gradient(135deg, rgba(93,139,255,.08), rgba(0,168,219,.08)),
        repeating-linear-gradient(45deg, rgba(93,139,255,.08), rgba(93,139,255,.08) 14px, rgba(255,255,255,.4) 14px, rgba(255,255,255,.4) 28px);
      text-align: center;
      padding: 24px;
      color: var(--muted);
    }

    .value-layout,
    .about-grid,
    .contact-grid,
    .footer-grid {
      display: grid;
      gap: 22px;
    }

    .value-layout { grid-template-columns: .82fr 1.18fr; }
    .about-grid { grid-template-columns: 1.12fr .88fr; }
    .contact-grid { grid-template-columns: 1.06fr .94fr; }
    .footer-grid { grid-template-columns: 1.2fr .8fr; align-items: end; }

    .panel,
    .about-card,
    .contact-card,
    .deliverable { padding: 28px; }

    .intro-panel { position: sticky; top: calc(var(--header-h) + 18px); }

    .tag-list,
    .deliverable-list,
    .contact-list,
    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 0;
      margin: 0;
      list-style: none;
    }

    .tag,
    .deliverable-list li,
    .footer-links a {
      padding: 10px 14px;
      border-radius: 999px;
      background: rgba(255,255,255,.86);
      border: 1px solid rgba(93,139,255,.12);
    }

    .cards-2,
    .cards-3 {
      display: grid;
      gap: 18px;
    }

    .cards-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .cards-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }

    .card,
    .use-case,
    .compare-card { padding: 24px; }

    .index {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 12px;
      margin-bottom: 16px;
      color: white;
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      font-weight: 700;
    }

    .pain-card { min-height: 180px; }
    .pain-card p { color: var(--text); font-size: 1.02rem; }

    .pain-summary {
      margin-top: 18px;
      padding: 22px 24px;
      border-radius: var(--radius);
      background: linear-gradient(135deg, rgba(0,168,219,.08), rgba(93,139,255,.08));
      border: 1px solid rgba(93,139,255,.12);
      color: var(--muted);
    }

    .use-case .role {
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid rgba(93,139,255,.12);
    }

    .use-case .role strong { display: inline-block; width: 42px; }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-bottom: 18px;
    }

    .compare-card ul,
    .compare-highlights ul,
    .footer-note {
      list-style: none;
      padding: 0;
      margin: 16px 0 0;
    }

    .compare-card li,
    .compare-highlights li,
    .contact-list li,
    .footer-note li {
      position: relative;
      padding-left: 18px;
      margin-top: 10px;
      color: var(--muted);
    }

    .compare-card li::before,
    .compare-highlights li::before,
    .contact-list li::before,
    .footer-note li::before {
      content: "";
      position: absolute;
      left: 0;
      top: .72em;
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 10px rgba(0,168,219,.34);
    }

    .compare-card.traditional li::before { background: #f2b36e; box-shadow: none; }
    .compare-highlights { padding: 24px 28px; }

    .quote {
      margin-top: 16px;
      padding: 18px 20px;
      border-left: 2px solid var(--accent);
      border-radius: 18px;
      background: rgba(255,255,255,.74);
    }

    .contact-side { display: grid; gap: 18px; }
    .contact-card strong.mail { display: inline-block; margin: 14px 0; font-size: 1.08rem; }

    .footer {
      padding: 28px 0 40px;
      border-top: 1px solid rgba(93,139,255,.1);
      background: rgba(255,255,255,.56);
    }

    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity .7s ease, transform .7s ease;
    }

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

    @keyframes flow { to { stroke-dashoffset: -220; } }
    @keyframes pulse { 0%,100% { transform: scale(1); opacity: .9; } 50% { transform: scale(1.3); opacity: 1; } }

    @media (max-width: 1080px) {
      .hero-grid,
      .visual-band,
      .value-layout,
      .about-grid,
      .contact-grid,
      .footer-grid { grid-template-columns: 1fr; }
      .intro-panel { position: static; }
      .hero-visual { min-height: auto; }
    }

    @media (max-width: 840px) {
      .nav, .header-cta { display: none; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .site-header.is-open .nav {
        display: flex;
        position: absolute;
        left: 20px;
        right: 20px;
        top: calc(100% + 10px);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px;
        gap: 0;
        border-radius: 22px;
        background: rgba(255,255,255,.96);
        border: 1px solid rgba(93,139,255,.12);
        box-shadow: var(--shadow);
      }
      .site-header.is-open .nav a { width: 100%; padding: 12px 6px; }
      .site-header.is-open .header-cta { display: inline-flex; width: 100%; justify-content: center; margin-top: 10px; }
      .hero-grid { min-height: auto; }
      .hero h1 { max-width: none; }
    }

    @media (max-width: 640px) {
      .wrap { width: min(var(--max), calc(100% - 24px)); }
      .cards-2,
      .cards-3,
      .compare-grid,
      .hero-meta,
      .hero-visual { grid-template-columns: 1fr; }
      .hero-visual { display: block; padding: 18px; }
      .hero-image.main,
      .hero-image.side,
      .hero-abstract,
      .hero-badge,
      .hero-note { min-height: 180px; margin-bottom: 14px; }
      .section { padding: 40px 0; }
    }