:root {
    --navy-950: #060d1f;
    --navy-900: #0a1530;
    --navy-800: #101f42;
    --blue-700: #1d4ed8;
    --blue-600: #2563eb;
    --blue-500: #3b82f6;
    --cyan-400: #22d3ee;
    --ink: #0f172a;
    --ink-soft: #475569;
    --ink-faint: #94a3b8;
    --paper: #ffffff;
    --paper-soft: #f6f8fc;
    --line: #e2e8f0;
    --radius: 16px;
    --font-jp: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic Medium", "游ゴシック Medium", YuGothic, Meiryo, system-ui, sans-serif;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-jp);
    color: var(--ink);
    background: var(--paper);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }
  img { max-width: 100%; }
  a { color: inherit; text-decoration: none; }
  ul { list-style: none; }

  .wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

  /* ---------- header ---------- */
  .header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(15,23,42,0.08);
    transition: background .3s;
  }
  .header-inner {
    max-width: 1080px; margin: 0 auto; padding: 0 24px;
    height: 64px; display: flex; align-items: center; gap: 12px;
  }
  .brand { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 3px; flex-shrink: 0; }
  .brand-lockup { display: flex; align-items: center; gap: 9px; }
  .brand-mark { height: 30px; width: auto; display: block; flex-shrink: 0; transition: transform .35s ease; }
  .brand:hover .brand-mark { transform: rotate(-6deg) scale(1.06); }
  .footer .brand-mark { background: #fff; border-radius: 8px; padding: 5px; height: 38px; width: 38px; object-fit: contain; }
  .brand-name { color: var(--ink); font-weight: 700; font-size: 19px; letter-spacing: .04em; white-space: nowrap; line-height: 1; }
  .brand-sub { display: block; font-size: 8px; letter-spacing: .3em; color: var(--ink-faint); font-weight: 500; white-space: nowrap; padding-left: 1px; }
  .footer .brand-name { color: #fff; }
  .footer .brand-sub { color: rgba(255,255,255,.45); }
  .gnav { margin-left: auto; display: flex; align-items: center; gap: 24px; }
  .gnav a { color: var(--ink-soft); font-size: 13.5px; font-weight: 500; transition: color .2s; white-space: nowrap; }
  .gnav a:hover { color: var(--ink); }
  .gnav .nav-cta {
    color: #fff; background: var(--blue-600);
    padding: 9px 20px; border-radius: 999px; font-weight: 700;
    transition: background .2s, transform .2s;
  }
  .gnav .nav-cta:hover { background: var(--blue-500); transform: translateY(-1px); }
  /* 中間幅では優先度の低いナビ項目から隠す (会社概要はフッターから辿れる) */
  @media (max-width: 1120px) { .gnav a[href="#mission"], .gnav a[href="#faq"] { display: none; } }
  @media (max-width: 920px) { .gnav a[href="#flow"], .gnav a[href="#strengths"] { display: none; } }
  @media (max-width: 760px) { .gnav a:not(.nav-cta) { display: none; } }

  /* ---------- hero ---------- */
  .hero {
    position: relative; overflow: hidden;
    background: radial-gradient(1200px 600px at 80% -10%, rgba(37,99,235,.14), transparent 60%),
                radial-gradient(900px 500px at -10% 110%, rgba(34,211,238,.1), transparent 55%),
                linear-gradient(180deg, #f0f5ff 0%, var(--paper) 100%);
    color: var(--ink);
    padding: 170px 0 120px;
  }
  .hero::before {
    content: ""; position: absolute; inset: 0;
    background-image: linear-gradient(rgba(15,23,42,.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(15,23,42,.05) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(800px 500px at 60% 20%, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(800px 500px at 60% 20%, #000 30%, transparent 75%);
  }
  .hero-inner { position: relative; }
  .hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 12.5px; font-weight: 600; letter-spacing: .12em;
    color: var(--blue-700);
    border: 1px solid rgba(37,99,235,.3);
    background: rgba(37,99,235,.06);
    padding: 6px 14px; border-radius: 999px;
    margin-bottom: 28px;
  }
  .hero h1 {
    font-size: clamp(32px, 5.2vw, 54px);
    font-weight: 800; line-height: 1.42; letter-spacing: .02em;
  }
  .hero h1 .grad {
    background: linear-gradient(90deg, var(--blue-600), #0891b2);
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
  .hero-lead {
    margin-top: 26px; max-width: 640px;
    font-size: clamp(14.5px, 1.7vw, 16.5px);
    color: var(--ink-soft); line-height: 2.1;
  }
  .hero-actions { margin-top: 42px; display: flex; flex-wrap: wrap; gap: 14px; }
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 32px; border-radius: 999px;
    font-size: 15px; font-weight: 700; letter-spacing: .02em;
    transition: transform .2s, box-shadow .2s, background .2s;
  }
  .btn-primary {
    background: linear-gradient(135deg, var(--blue-600), #3b76f6);
    color: #fff; box-shadow: 0 8px 24px rgba(37,99,235,.4);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(37,99,235,.5); }
  .btn-ghost {
    border: 1px solid rgba(15,23,42,.22); color: var(--ink);
  }
  .btn-ghost:hover { background: rgba(15,23,42,.05); transform: translateY(-2px); }

  .hero-points {
    margin-top: 64px; display: grid; gap: 1px;
    grid-template-columns: repeat(3, 1fr);
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--radius); overflow: hidden;
    box-shadow: 0 10px 30px rgba(15,23,42,.06);
  }
  .hero-point { background: #fff; padding: 22px 24px; }
  .hero-point b { display: block; font-size: 15px; color: var(--ink); margin-bottom: 4px; }
  .hero-point span { font-size: 12.5px; color: var(--ink-soft); line-height: 1.7; display: block; }
  @media (max-width: 760px) { .hero-points { grid-template-columns: 1fr; } .hero { padding: 130px 0 80px; } }

  /* ---------- sections ---------- */
  section { padding: 104px 0; }
  .sec-label {
    display: inline-block; font-size: 12px; font-weight: 700;
    letter-spacing: .24em; color: var(--blue-600); margin-bottom: 14px;
  }
  .sec-title { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; line-height: 1.5; letter-spacing: .02em; }
  .sec-lead { margin-top: 18px; color: var(--ink-soft); font-size: 15px; max-width: 620px; }
  .center { text-align: center; }
  .center .sec-lead { margin-left: auto; margin-right: auto; }

  /* pain (こんな作業ありませんか) */
  .pain { background: var(--paper-soft); }
  .pain-callout {
    margin: 52px auto 0; max-width: 700px;
    background: linear-gradient(135deg, rgba(37,99,235,.06), rgba(34,211,238,.08));
    border: 1px solid rgba(37,99,235,.25);
    border-radius: var(--radius);
    padding: 28px 32px; font-size: 15px; line-height: 2;
  }
  .pain-callout b { color: var(--blue-700); }
  @media (max-width: 560px) { .pain-callout { padding: 22px 20px; } }

  /* mission */
  .mission { background: var(--paper); }
  .mission-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-top: 8px; }
  .mission-copy p { margin-top: 20px; color: var(--ink-soft); font-size: 15px; }
  .mission-visual {
    position: relative; border-radius: var(--radius);
    background: linear-gradient(160deg, var(--navy-900), var(--navy-800));
    padding: 36px 32px; color: #fff; overflow: hidden;
  }
  .mission-visual::after {
    content: ""; position: absolute; right: -60px; top: -60px;
    width: 220px; height: 220px; border-radius: 50%;
    background: radial-gradient(circle, rgba(34,211,238,.25), transparent 70%);
  }
  .flow-chip {
    display: flex; align-items: center; gap: 14px;
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.1);
    border-radius: 12px; padding: 14px 18px;
    font-size: 13.5px;
  }
  .flow-chip + .flow-arrow { text-align: center; color: rgba(255,255,255,.35); font-size: 16px; margin: 6px 0; }
  .flow-chip .n {
    flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%;
    background: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
    display: grid; place-items: center; font-weight: 800; font-size: 13px;
  }
  .flow-chip b { display: block; }
  .flow-chip span { color: rgba(255,255,255,.55); font-size: 11.5px; display: block; line-height: 1.6; }
  @media (max-width: 860px) { .mission-grid { grid-template-columns: 1fr; gap: 40px; } }

  /* services */
  .services { background: var(--paper-soft); }
  .card-grid { margin-top: 56px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .card {
    background: var(--paper); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 34px 28px;
    transition: transform .25s, box-shadow .25s;
    display: flex; flex-direction: column;
  }
  .card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(15,23,42,.1); }
  .card-num { font-size: 12px; font-weight: 700; letter-spacing: .18em; color: var(--blue-600); }
  .card-icon {
    width: 52px; height: 52px; border-radius: 14px; margin: 18px 0 20px;
    background: linear-gradient(135deg, rgba(37,99,235,.12), rgba(34,211,238,.12));
    display: grid; place-items: center;
    color: var(--blue-600);
  }
  /* アイコンは線画 (Lucide) で統一。stroke は currentColor に載せて色を一元管理 */
  .card-icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
  .strength-head .ic svg { width: 22px; height: 22px; fill: none; stroke: #fff; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
  .explain-icon svg { width: 38px; height: 38px; fill: none; stroke: #fff; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
  .card h3 { font-size: 19px; font-weight: 800; line-height: 1.5; word-break: keep-all; overflow-wrap: break-word; }
  .card p { margin-top: 12px; font-size: 13.5px; color: var(--ink-soft); flex: 1; }
  .card-tags { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 6px; }
  .card-tags li {
    font-size: 11px; font-weight: 600; color: var(--blue-700);
    background: rgba(37,99,235,.08); border-radius: 999px; padding: 4px 12px;
  }
  @media (max-width: 860px) { .card-grid { grid-template-columns: 1fr; } }

  /* strengths */
  .strengths { background: var(--navy-950); color: #fff; position: relative; overflow: hidden; }
  .strengths::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(800px 400px at 90% 10%, rgba(37,99,235,.25), transparent 60%);
  }
  .strengths .wrap { position: relative; }
  .strengths .sec-label { color: var(--cyan-400); }
  .strengths .sec-lead { color: rgba(255,255,255,.6); }
  .strength-grid { margin-top: 56px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .strength {
    border: 1px solid rgba(255,255,255,.12);
    background: rgba(255,255,255,.04);
    border-radius: var(--radius); padding: 30px 28px;
    transition: background .25s, border-color .25s;
  }
  .strength:hover { background: rgba(255,255,255,.07); border-color: rgba(34,211,238,.4); }
  .strength-head { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
  .strength-head .ic {
    width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
    background: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
    display: grid; place-items: center; font-size: 19px;
  }
  .strength h3 { font-size: 17px; font-weight: 800; }
  .strength p { font-size: 13.5px; color: rgba(255,255,255,.62); }
  @media (max-width: 760px) { .strength-grid { grid-template-columns: 1fr; } }

  /* explain (AI開発って何？への誘導) */
  .explain { background: var(--paper); padding: 84px 0; }
  .explain-band {
    display: flex; align-items: center; gap: 40px;
    background: linear-gradient(135deg, rgba(37,99,235,.06), rgba(34,211,238,.09));
    border: 1px solid rgba(37,99,235,.22);
    border-radius: var(--radius);
    padding: 44px 48px;
  }
  .explain-icon {
    flex-shrink: 0; width: 76px; height: 76px; border-radius: 20px;
    background: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
    display: grid; place-items: center; font-size: 36px;
    box-shadow: 0 10px 26px rgba(37,99,235,.3);
  }
  .explain-copy { flex: 1; }
  .explain-copy h2 { font-size: clamp(20px, 2.6vw, 26px); font-weight: 800; line-height: 1.5; }
  .explain-copy p { margin-top: 10px; font-size: 14px; color: var(--ink-soft); }
  .explain-band .btn { flex-shrink: 0; }
  @media (max-width: 860px) {
    .explain-band { flex-direction: column; align-items: flex-start; padding: 32px 28px; }
    .explain-icon { width: 60px; height: 60px; font-size: 28px; border-radius: 16px; }
  }

  /* flow */
  .flow-steps { margin-top: 64px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; }
  .flow-steps::before {
    content: ""; position: absolute; top: 34px; left: 14%; right: 14%;
    height: 2px; background: linear-gradient(90deg, var(--blue-600), var(--cyan-400));
    opacity: .3;
  }
  .step { text-align: center; position: relative; }
  .step-num {
    width: 68px; height: 68px; border-radius: 50%; margin: 0 auto;
    background: linear-gradient(135deg, var(--blue-600), #3b76f6);
    color: #fff; font-size: 26px; font-weight: 800;
    display: grid; place-items: center;
    box-shadow: 0 10px 26px rgba(37,99,235,.35), 0 0 0 8px var(--paper);
  }
  .step-dur {
    display: inline-block; margin-top: 16px; font-size: 12px; font-weight: 700;
    color: var(--blue-700); background: rgba(37,99,235,.08);
    padding: 5px 14px; border-radius: 999px;
  }
  .step h3 { margin-top: 12px; font-size: 18px; font-weight: 800; }
  .step p { margin-top: 10px; font-size: 13px; color: var(--ink-soft); max-width: 280px; margin-left: auto; margin-right: auto; }
  @media (max-width: 760px) {
    .flow-steps { grid-template-columns: 1fr; gap: 44px; }
    .flow-steps::before { display: none; }
  }

  /* faq */
  .faq { background: var(--paper-soft); }
  .faq-list { margin: 48px auto 0; max-width: 760px; display: grid; gap: 14px; text-align: left; }
  .faq-item {
    background: #fff; border: 1px solid var(--line);
    border-radius: 14px; overflow: hidden;
    transition: box-shadow .25s;
  }
  .faq-item[open] { box-shadow: 0 8px 24px rgba(15,23,42,.07); }
  .faq-item summary {
    list-style: none; cursor: pointer;
    display: flex; align-items: center; gap: 14px;
    padding: 20px 22px; font-weight: 700; font-size: 15px;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-q {
    flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%;
    background: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
    color: #fff; display: grid; place-items: center;
    font-size: 13px; font-weight: 800;
  }
  .faq-item summary .toggle { margin-left: auto; color: var(--ink-faint); font-size: 18px; transition: transform .25s; }
  .faq-item[open] summary .toggle { transform: rotate(45deg); }
  .faq-a { padding: 0 22px 20px 66px; font-size: 14px; color: var(--ink-soft); }
  @media (max-width: 560px) { .faq-a { padding-left: 22px; } }

  /* company */
  .company { background: var(--paper); }
  .company-table {
    margin-top: 48px; width: 100%; max-width: 720px;
    margin-left: auto; margin-right: auto;
    border-collapse: collapse; background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius); overflow: hidden;
    box-shadow: 0 4px 20px rgba(15,23,42,.06);
  }
  .company-table th, .company-table td {
    padding: 20px 26px; font-size: 14px; text-align: left;
    border-bottom: 1px solid var(--line);
  }
  .company-table tr:last-child th, .company-table tr:last-child td { border-bottom: none; }
  .company-table th { width: 30%; color: var(--ink-faint); font-weight: 600; background: #fafbfe; white-space: nowrap; }
  .company-table td { color: var(--ink); font-weight: 500; }

  /* contact */
  .contact {
    background: radial-gradient(900px 500px at 50% -20%, rgba(37,99,235,.07), transparent 60%),
                var(--paper-soft);
  }
  .contact-form {
    margin: 52px auto 0; max-width: 620px;
    display: grid; gap: 18px;
    background: #fff; border: 1px solid var(--line);
    border-radius: var(--radius); padding: 40px 36px;
    box-shadow: 0 10px 30px rgba(15,23,42,.06);
    text-align: left;
  }
  .field label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 8px; color: var(--ink); }
  .field label .req {
    font-size: 10px; color: #e11d48; border: 1px solid rgba(225,29,72,.35);
    border-radius: 4px; padding: 1px 6px; margin-left: 8px; vertical-align: 1px;
  }
  .field input, .field textarea {
    width: 100%; padding: 14px 16px; font-size: 14px; font-family: inherit;
    border-radius: 10px; border: 1px solid var(--line);
    background: var(--paper-soft); color: var(--ink); outline: none;
    transition: border-color .2s, background .2s, box-shadow .2s;
  }
  .field input::placeholder, .field textarea::placeholder { color: var(--ink-faint); }
  .field input:focus, .field textarea:focus {
    border-color: var(--blue-500); background: #fff;
    box-shadow: 0 0 0 3px rgba(59,130,246,.15);
  }
  .contact-form .btn-primary { width: 100%; border: none; cursor: pointer; font-family: inherit; }
  .form-note { font-size: 11.5px; color: var(--ink-faint); text-align: center; }
  @media (max-width: 560px) { .contact-form { padding: 28px 20px; } }

  /* responsive hardening (グリッド項目が内容幅で溢れないように) */
  .card, .tool, .hstep, .boxstep, .strength, .step { min-width: 0; }
  .card-grid > *, .grid2 > *, .tools > *, .hflow > *, .flow-steps > *, .strength-grid > * { min-width: 0; }
  @media (max-width: 380px) {
    .wrap { padding: 0 16px; }
    .header-inner { padding: 0 16px; gap: 8px; }
    .card { padding: 24px 20px; }
    .gnav .nav-cta { padding: 8px 14px; }
    .callout { padding: 20px 18px; }
  }

  /* footer */
  .footer { background: var(--navy-950); color: rgba(255,255,255,.5); border-top: 1px solid rgba(255,255,255,.08); }
  .footer-inner {
    max-width: 1080px; margin: 0 auto; padding: 40px 24px;
    display: flex; flex-wrap: wrap; align-items: center; gap: 16px; justify-content: space-between;
    font-size: 12px;
  }
  .footer .brand-name { font-size: 15px; }
  .footer-nav { display: flex; gap: 22px; }
  .footer-nav a:hover { color: #fff; }

  /* ---------- motion ---------- */
  @keyframes fadeUp { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
  @keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
  @keyframes shimmer { to { background-position: 200% center; } }
  @keyframes bounceDown { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(7px); } }

  /* reveal on scroll (staggered inside grids) */
  .reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .75s cubic-bezier(.22,.61,.36,1); }
  .reveal.on { opacity: 1; transform: none; }
  .card-grid .reveal:nth-child(2), .grid2 .reveal:nth-child(2), .tools .reveal:nth-child(2) { transition-delay: .09s; }
  .card-grid .reveal:nth-child(3), .grid2 .reveal:nth-child(3), .tools .reveal:nth-child(3) { transition-delay: .18s; }
  .card-grid .reveal:nth-child(4), .grid2 .reveal:nth-child(4) { transition-delay: .27s; }

  /* gradient shimmer on hero highlight */
  .hero h1 .grad { background-size: 200% auto; animation: shimmer 6s linear infinite; }

  /* hover micro-interactions */
  .card, .tool, .hstep, .boxstep, .strength { transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease; }
  .card:hover, .tool:hover, .hstep:hover, .boxstep:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(15,23,42,.11); }
  .card-icon, .strength-head .ic, .tool .badge, .explain-icon { transition: transform .35s cubic-bezier(.34,1.56,.64,1); }
  .card:hover .card-icon, .tool:hover .badge { transform: scale(1.12) rotate(-5deg); }
  .explain-icon { animation: floaty 4.5s ease-in-out infinite; }
  .btn { will-change: transform; }
  /* hero entrance */
  .hero-eyebrow { animation: fadeUp .7s .05s both; }
  .hero h1 { animation: fadeUp .8s .2s both; }
  .hero-lead { animation: fadeUp .8s .36s both; }
  .hero-actions { animation: fadeUp .8s .52s both; }
  .hero-points { animation: fadeUp .8s .66s both; }
  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .hero-eyebrow, .hero h1, .hero-lead, .hero-actions, .hero-points, .hero-scroll,
    .hero h1 .grad, .explain-icon { animation: none !important; }
    html { scroll-behavior: auto; }
  }