:root {
    --ink: #1a1a2e;
    --ink-mid: #2d2d4a;
    --accent: #c8974a;
    --accent-light: #e8c17a;
    --cream: #f9f6f0;
    --cream-mid: #f0ebe0;
    --teal: #2a7a6b;
    --teal-light: #e0f0ec;
    --muted: #6b6b80;
    --border: rgba(26,26,46,0.12);
    --serif: 'Noto Serif JP', serif;
    --sans: 'Noto Sans JP', sans-serif;
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--sans);
    background: var(--cream);
    color: var(--ink);
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* NAV */
/*
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 48px;
    height: 64px;
    background: rgba(249,246,240,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  .nav-logo {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: 0.05em;
  }
  .nav-logo span { color: var(--accent); }
  .nav-links { display: flex; gap: 32px; list-style: none; }
  .nav-links a {
    font-size: 13px;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--ink); }
  .nav-cta {
    background: var(--ink);
    color: var(--cream) !important;
    padding: 8px 20px;
    border-radius: 2px;
  }
  .nav-cta:hover { background: var(--accent) !important; color: var(--ink) !important; }
*/
  /* HERO */
  .hero-nav {
    position: relative;
    top: -50px;
    text-align: center;
    z-index: 10;
  }
  .hero {
    /* min-height: 100vh; */
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 28px 28px 28px;
    gap: 58px;
    position: relative;
    overflow: hidden;
    margin-bottom: 1rem;
  }
  .hero::before {
    content: '';
    position: absolute; top: 0; right: 0;
    width: 50%; height: 100%;
    background: var(--ink);
    z-index: 0;
  }
  .hero-left { position: relative; z-index: 1; }
  .hero-right { position: relative; z-index: 1; }
  .hero-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 4px 12px;
    margin-bottom: 24px;
    text-transform: uppercase;
  }
  .hero h1 {
    font-family: var(--serif);
    font-size: clamp(32px, 4vw, 52px);
    font-weight: 900;
    line-height: 1.3;
    color: var(--ink);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
  }
  .hero h1 em {
    font-style: normal;
    color: var(--teal);
    border-bottom: 3px solid var(--teal);
  }
  .hero-desc {
    font-size: 15px;
    color: var(--muted);
    line-height: 1.9;
    margin-bottom: 40px;
    max-width: 440px;
  }
  .hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
  .btn-primary {
    background: var(--teal);
    color: #fff;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-decoration: none;
    border-radius: 2px;
    transition: all 0.2s;
  }
  .btn-primary:hover { background: var(--ink); transform: translateY(-2px); }
  .btn-secondary {
    border: 1.5px solid var(--ink);
    color: var(--ink);
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 2px;
    transition: all 0.2s;
  }
  .btn-secondary:hover { background: var(--ink); color: var(--cream); }

  /* Hero right — stats panel */
  .hero-panel {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 4px;
    padding: 40px;
    color: #fff;
  }
  .hero-panel h3 {
    font-family: var(--serif);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--accent-light);
    letter-spacing: 0.05em;
  }
  .stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 32px; }
  .stat-item {}
  .stat-num {
    font-family: var(--serif);
    font-size: 36px;
    font-weight: 900;
    color: #fff;
    line-height: 1;
    margin-bottom: 6px;
  }
  .stat-num sup { font-size: 18px; }
  .stat-label { font-size: 12px; color: rgba(255,255,255,0.6); letter-spacing: 0.03em; }
  .hero-quote {
    border-left: 2px solid var(--accent);
    padding-left: 16px;
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    font-style: italic;
  }

  /* SECTION BASE */
  section { padding: 96px 48px; }
  .section-tag {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 12px;
  }
  .section-title {
    font-family: var(--serif);
    font-size: clamp(26px, 3vw, 40px);
    font-weight: 900;
    line-height: 1.35;
    color: var(--ink);
    margin-bottom: 16px;
  }
  .section-lead {
    font-size: 15px;
    color: var(--muted);
    max-width: 560px;
    line-height: 1.9;
    margin-bottom: 56px;
  }

  /* PROBLEM SECTION */
  .problem-section { background: var(--ink); color: #fff; }
  .problem-section .section-tag { color: var(--accent-light); }
  .problem-section .section-title { color: #fff; }
  .problem-section .section-lead { color: rgba(255,255,255,0.65); }
  .problem-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
  .problem-card {
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 4px;
    padding: 32px;
    position: relative;
    transition: border-color 0.2s;
  }
  .problem-card:hover { border-color: rgba(200,151,74,0.5); }
  .problem-num {
    font-family: var(--serif);
    font-size: 48px;
    font-weight: 900;
    color: rgba(255,255,255,0.08);
    line-height: 1;
    margin-bottom: 16px;
  }
  .problem-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
    line-height: 1.5;
  }
  .problem-card p { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 1.9; }
  .problem-arrow {
    text-align: center;
    font-size: 32px;
    color: var(--accent);
    margin: 48px 0 24px;
  }
  .problem-solution {
    background: rgba(200,151,74,0.12);
    border: 1px solid rgba(200,151,74,0.3);
    border-radius: 4px;
    padding: 32px 40px;
    display: flex;
    align-items: center;
    gap: 32px;
  }
  .problem-solution-icon {
    font-size: 48px;
    flex-shrink: 0;
  }
  .problem-solution h4 {
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-light);
    margin-bottom: 8px;
  }
  .problem-solution p { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.8; }

  /* MECHANISM SECTION */
  .mechanism-section { background: var(--cream); }
  .mech-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 32px; }
  .mech-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 40px;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
  }
  .mech-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(26,26,46,0.1); }
  .mech-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--teal);
  }
  .mech-card:nth-child(2)::before { background: var(--accent); }
  .mech-card:nth-child(3)::before { background: var(--ink); }
  .mech-card:nth-child(4)::before { background: #7a4a8a; }
  .mech-num {
    font-family: var(--serif);
    font-size: 56px;
    font-weight: 900;
    color: var(--cream-mid);
    line-height: 1;
    margin-bottom: 16px;
  }
  .mech-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 12px;
  }
  .mech-card p { font-size: 14px; color: var(--muted); line-height: 1.9; }
  .mech-card ul { list-style: none; margin-top: 16px; }
  .mech-card ul li {
    font-size: 13px;
    color: var(--muted);
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .mech-card ul li::before { content: '→'; color: var(--teal); font-size: 12px; }

  /* VALUE SECTION */
  .value-section { background: var(--cream-mid); }
  .value-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 80px;
  }
  .value-row:last-child { margin-bottom: 0; }
  .value-row.reverse .value-visual { order: -1; }
  .value-visual {
    background: var(--ink);
    border-radius: 4px;
    padding: 48px 40px;
    color: #fff;
    position: relative;
    overflow: hidden;
  }
  .value-visual::after {
    content: '';
    position: absolute;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: rgba(200,151,74,0.1);
    bottom: -80px; right: -80px;
  }
  .value-visual-num {
    font-family: var(--serif);
    font-size: 72px;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
  }
  .value-visual-label { font-size: 13px; color: rgba(255,255,255,0.6); }
  .value-visual-sub {
    font-size: 16px;
    color: rgba(255,255,255,0.85);
    margin-top: 24px;
    line-height: 1.7;
    position: relative; z-index: 1;
  }
  .value-content h3 {
    font-family: var(--serif);
    font-size: 26px;
    font-weight: 900;
    color: var(--ink);
    margin-bottom: 16px;
    line-height: 1.4;
  }
  .value-content p { font-size: 14px; color: var(--muted); line-height: 1.9; margin-bottom: 16px; }
  .value-tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
  .value-tag {
    font-size: 12px;
    font-weight: 500;
    color: var(--teal);
    background: var(--teal-light);
    padding: 4px 12px;
    border-radius: 2px;
  }

  /* CASES */
  .cases-section { background: #fff; }
  .cases-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
  .case-card {
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
  }
  .case-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(26,26,46,0.1); }
  .case-header {
    background: var(--ink);
    padding: 24px 28px;
    color: #fff;
  }
  .case-industry {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent-light);
    margin-bottom: 8px;
    text-transform: uppercase;
  }
  .case-header h4 { font-size: 17px; font-weight: 700; line-height: 1.4; }
  .case-body { padding: 28px; }
  .case-challenge {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 8px;
  }
  .case-body p { font-size: 13px; color: var(--muted); line-height: 1.8; margin-bottom: 16px; }
  .case-result {
    background: var(--teal-light);
    border-left: 3px solid var(--teal);
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 700;
    color: var(--teal);
    border-radius: 0 2px 2px 0;
  }

  /* CTA SECTION */
  .cta-section {
    background: var(--ink);
    text-align: center;
    padding: 96px 48px;
  }
  .cta-section .section-tag { color: var(--accent-light); }
  .cta-section .section-title { color: #fff; margin: 0 auto 16px; }
  .cta-section .section-lead { color: rgba(255,255,255,0.6); margin: 0 auto 48px; }
  .cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
  .btn-accent {
    background: var(--accent);
    color: var(--ink);
    padding: 16px 40px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-decoration: none;
    border-radius: 2px;
    transition: all 0.2s;
  }
  .btn-accent:hover { background: var(--accent-light); transform: translateY(-2px); }
  .btn-ghost {
    border: 1.5px solid rgba(255,255,255,0.3);
    color: rgba(255,255,255,0.8);
    padding: 16px 40px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 2px;
    transition: all 0.2s;
  }
  .btn-ghost:hover { border-color: #fff; color: #fff; }

  /* FOOTER */
  /* 以下　common.css　を適用　---------- 
  footer {
    background: #0d0d1a;
    color: rgba(255,255,255,0.4);
    text-align: center;
    padding: 32px 48px;
    font-size: 12px;
    letter-spacing: 0.05em;
  }
  footer a { color: rgba(255,255,255,0.5); text-decoration: none; margin: 0 12px; }
  footer a:hover { color: var(--accent-light); }
  --------------------------------- */
  /* ANIMATIONS */
  .fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .fade-up.visible { opacity: 1; transform: translateY(0); }

  @media (max-width: 768px) {
    nav { padding: 0 20px; }
    .nav-links { display: none; }
    .hero { grid-template-columns: 1fr; padding: 100px 20px 48px; }
    .hero::before { display: none; }
    .hero-panel { background: var(--ink); }
    section { padding: 64px 20px; }
    .problem-grid, .mech-grid, .cases-grid { grid-template-columns: 1fr; }
    .value-row, .value-row.reverse { grid-template-columns: 1fr; }
    .value-row.reverse .value-visual { order: 0; }
  }