:root {
  --sf-blue: #00A1E0;
  --sf-dark: #032D60;
  --sf-mid: #0A4A8A;
  --sf-light: #F0F8FF;
  --sf-green: #16A34A;
  --gray: #6B7280;
  --light-gray: #F9FAFB;
  --border: #E5E7EB;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Hiragino Kaku Gothic ProN', 'Meiryo', 'Yu Gothic', sans-serif; color: #1F2937; background: #fff; }

/* HEADER */
header { background: var(--sf-dark); padding: 0 40px; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 12px rgba(0,0,0,0.4); }
.header-inner { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-icon { width: 40px; height: 40px; background: linear-gradient(135deg, var(--sf-blue), #0070D2); border-radius: 9px; display: flex; align-items: center; justify-content: center; font-size: 20px; color: white; font-weight: 900; }
.logo-text { color: white; font-size: 19px; font-weight: 800; letter-spacing: 1px; }
.logo-sub { color: var(--sf-blue); font-size: 10px; display: block; letter-spacing: 2px; margin-top: 1px; }
nav { display: flex; gap: 24px; }
nav a { color: rgba(255,255,255,0.82); text-decoration: none; font-size: 14px; font-weight: 500; padding: 4px 0; border-bottom: 2px solid transparent; transition: all 0.2s; }
nav a:hover { color: var(--sf-blue); border-bottom-color: var(--sf-blue); }
.header-cta { background: var(--sf-blue); color: white; padding: 9px 22px; border-radius: 6px; text-decoration: none; font-size: 14px; font-weight: 700; transition: background 0.2s; }
.header-cta:hover { background: #0070D2; }

/* HERO */
.hero { background: linear-gradient(135deg, var(--sf-dark) 0%, var(--sf-mid) 55%, #0070D2 100%); padding: 96px 40px 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 50%, rgba(0,161,224,0.15) 0%, transparent 60%); }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(0,161,224,0.18); border: 1px solid rgba(0,161,224,0.45); color: #7DD3FC; padding: 6px 18px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 26px; position: relative; }
.dot { width: 8px; height: 8px; background: var(--sf-blue); border-radius: 50%; display: inline-block; }
.hero h1 { font-size: 54px; font-weight: 900; color: white; line-height: 1.2; margin-bottom: 22px; position: relative; }
.hero h1 em { color: var(--sf-blue); font-style: normal; }
.hero p { font-size: 18px; color: rgba(255,255,255,0.78); max-width: 620px; margin: 0 auto 40px; line-height: 1.85; position: relative; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; }
.btn-primary { background: var(--sf-blue); color: white; padding: 14px 34px; border-radius: 8px; text-decoration: none; font-weight: 700; font-size: 16px; transition: all 0.2s; box-shadow: 0 4px 18px rgba(0,161,224,0.45); }
.btn-primary:hover { background: #0070D2; transform: translateY(-2px); }
.btn-outline { background: transparent; color: white; padding: 14px 34px; border-radius: 8px; text-decoration: none; font-weight: 700; font-size: 16px; border: 2px solid rgba(255,255,255,0.45); transition: all 0.2s; }
.btn-outline:hover { border-color: white; background: rgba(255,255,255,0.1); }
.hero-stats { display: flex; justify-content: center; gap: 56px; margin-top: 60px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.14); flex-wrap: wrap; position: relative; }
.stat { text-align: center; }
.stat-num { font-size: 42px; font-weight: 900; color: white; }
.stat-num span { color: var(--sf-blue); }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.58); margin-top: 4px; }

/* SECTION BASE */
section { padding: 80px 40px; }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-tag { display: inline-block; background: rgba(0,161,224,0.1); color: var(--sf-blue); padding: 4px 14px; border-radius: 20px; font-size: 11px; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px; }
.section-title { font-size: 36px; font-weight: 900; color: var(--sf-dark); margin-bottom: 14px; line-height: 1.3; }
.section-desc { font-size: 15px; color: var(--gray); line-height: 1.85; max-width: 640px; }
.section-header { margin-bottom: 52px; }
.section-header.center { text-align: center; }
.section-header.center .section-desc { margin: 0 auto; }

/* ABOUT */
.about { background: var(--light-gray); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.about-content p { font-size: 15px; color: #374151; line-height: 1.9; margin-bottom: 16px; }
.about-table { width: 100%; border-collapse: collapse; margin-top: 28px; }
.about-table tr { border-bottom: 1px solid var(--border); }
.about-table td { padding: 13px 8px; font-size: 14px; }
.about-table td:first-child { color: var(--gray); width: 130px; font-weight: 700; }
.about-cards { display: flex; flex-direction: column; gap: 14px; }
.about-card { background: white; border-radius: 12px; padding: 20px 22px; display: flex; align-items: center; gap: 16px; box-shadow: 0 2px 8px rgba(0,0,0,0.06); border-left: 4px solid var(--sf-blue); }
.about-card-icon { width: 46px; height: 46px; background: linear-gradient(135deg, var(--sf-blue), #0070D2); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.about-card h4 { font-size: 15px; font-weight: 700; color: var(--sf-dark); }
.about-card p { font-size: 13px; color: var(--gray); margin-top: 3px; line-height: 1.6; }

/* SF CAPABILITY */
.sf-cap { background: white; }
.sf-partner-banner { background: linear-gradient(135deg, var(--sf-dark), var(--sf-mid)); border-radius: 16px; padding: 30px 36px; margin-bottom: 52px; display: flex; align-items: center; gap: 24px; color: white; }
.banner-icon { width: 68px; height: 68px; background: var(--sf-blue); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 34px; flex-shrink: 0; }
.sf-partner-banner h3 { font-size: 22px; font-weight: 800; }
.sf-partner-banner p { font-size: 14px; color: rgba(255,255,255,0.72); margin-top: 5px; line-height: 1.6; }
.cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; margin-bottom: 52px; }
.cert-card { background: var(--sf-light); border: 1px solid #BFDBFE; border-radius: 10px; padding: 14px 16px; display: flex; align-items: center; gap: 12px; }
.ci { width: 34px; height: 34px; background: var(--sf-blue); border-radius: 7px; display: flex; align-items: center; justify-content: center; color: white; font-size: 15px; flex-shrink: 0; }
.cert-card span { font-size: 13px; font-weight: 600; color: var(--sf-dark); }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-card { border: 1px solid var(--border); border-radius: 14px; padding: 28px; transition: all 0.3s; position: relative; overflow: hidden; }
.product-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--sf-blue), #0070D2); }
.product-card:hover { box-shadow: 0 10px 32px rgba(0,112,210,0.14); transform: translateY(-4px); }
.p-icon { font-size: 38px; margin-bottom: 14px; }
.product-tag { display: inline-block; background: rgba(0,161,224,0.1); color: var(--sf-blue); padding: 3px 10px; border-radius: 12px; font-size: 11px; font-weight: 700; margin-bottom: 10px; }
.product-card h4 { font-size: 17px; font-weight: 800; color: var(--sf-dark); margin-bottom: 8px; }
.product-card p { font-size: 14px; color: var(--gray); line-height: 1.7; }

/* CASES */
.cases { background: var(--light-gray); }
.cases-list { display: flex; flex-direction: column; gap: 32px; }
.case-card { background: white; border-radius: 18px; overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,0.07); transition: all 0.3s; }
.case-card:hover { box-shadow: 0 14px 44px rgba(0,0,0,0.12); transform: translateY(-3px); }
.case-header { background: linear-gradient(135deg, var(--sf-dark) 0%, var(--sf-mid) 100%); padding: 28px 36px; display: flex; align-items: flex-start; gap: 22px; }
.case-icon { width: 60px; height: 60px; background: rgba(255,255,255,0.14); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 28px; flex-shrink: 0; }
.case-header-info { flex: 1; }
.case-industry { display: inline-block; background: rgba(0,161,224,0.28); color: #7DD3FC; padding: 3px 12px; border-radius: 12px; font-size: 11px; font-weight: 700; margin-bottom: 8px; }
.case-header h3 { font-size: 21px; font-weight: 900; color: white; line-height: 1.3; }
.case-header p { font-size: 13px; color: rgba(255,255,255,0.68); margin-top: 5px; }
.case-sf-badge { background: rgba(0,161,224,0.2); border: 1px solid rgba(0,161,224,0.4); color: #7DD3FC; padding: 5px 14px; border-radius: 8px; font-size: 12px; font-weight: 700; white-space: nowrap; align-self: flex-start; }
.case-body { padding: 32px 36px; }
.case-two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.case-section { margin-bottom: 0; }
.case-section-title { font-size: 11px; font-weight: 800; color: var(--sf-blue); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.case-section-title::before { content: ''; width: 3px; height: 14px; background: var(--sf-blue); border-radius: 2px; }
.case-section p { font-size: 14px; color: #374151; line-height: 1.8; }
.case-section ul { list-style: none; padding: 0; }
.case-section ul li { font-size: 14px; color: #374151; padding: 5px 0; display: flex; align-items: flex-start; gap: 8px; line-height: 1.6; }
.case-section ul li::before { content: '✓'; color: var(--sf-blue); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.case-results { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; padding-top: 24px; border-top: 1px solid #F3F4F6; }
.result-badge { flex: 1; min-width: 110px; border-radius: 12px; padding: 14px 16px; text-align: center; }
.result-badge.blue { background: linear-gradient(135deg, #EFF6FF, #DBEAFE); border: 1px solid #BFDBFE; }
.result-badge.blue .r-num { color: var(--sf-blue); }
.result-badge.green { background: linear-gradient(135deg, #F0FDF4, #DCFCE7); border: 1px solid #BBF7D0; }
.result-badge.green .r-num { color: var(--sf-green); }
.result-badge.orange { background: linear-gradient(135deg, #FFF7ED, #FED7AA); border: 1px solid #FDBA74; }
.result-badge.orange .r-num { color: #EA580C; }
.result-badge.purple { background: linear-gradient(135deg, #FAF5FF, #EDE9FE); border: 1px solid #DDD6FE; }
.result-badge.purple .r-num { color: #7C3AED; }
.r-num { font-size: 26px; font-weight: 900; }
.r-label { font-size: 11px; color: var(--gray); margin-top: 3px; line-height: 1.4; }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.case-tag { background: #F3F4F6; color: #6B7280; padding: 4px 12px; border-radius: 20px; font-size: 12px; }

/* PROCESS */
.process { background: white; }
.process-steps { display: flex; gap: 0; position: relative; }
.process-steps::before { content: ''; position: absolute; top: 35px; left: 8%; right: 8%; height: 2px; background: linear-gradient(90deg, var(--sf-blue), #0070D2); }
.process-step { flex: 1; text-align: center; padding: 0 14px; position: relative; }
.step-num { width: 70px; height: 70px; background: linear-gradient(135deg, var(--sf-blue), #0070D2); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 26px; margin: 0 auto 18px; position: relative; z-index: 1; box-shadow: 0 4px 18px rgba(0,161,224,0.4); }
.process-step h4 { font-size: 15px; font-weight: 800; color: var(--sf-dark); margin-bottom: 8px; }
.process-step p { font-size: 13px; color: var(--gray); line-height: 1.65; }

/* CTA */
.cta-section { background: linear-gradient(135deg, var(--sf-dark), var(--sf-mid)); padding: 80px 40px; text-align: center; }
.cta-section h2 { font-size: 36px; font-weight: 900; color: white; margin-bottom: 16px; }
.cta-section > p { font-size: 16px; color: rgba(255,255,255,0.72); margin-bottom: 36px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* FOOTER */
footer { background: #0F172A; padding: 52px 40px 24px; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.8; margin-top: 14px; }
.footer-col h5 { color: white; font-size: 14px; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 9px; }
.footer-col ul li a { color: rgba(255,255,255,0.55); text-decoration: none; font-size: 13px; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--sf-blue); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: rgba(255,255,255,0.45); }
.sf-certified { display: flex; align-items: center; gap: 8px; background: rgba(0,161,224,0.14); border: 1px solid rgba(0,161,224,0.3); padding: 6px 14px; border-radius: 20px; color: var(--sf-blue); font-size: 12px; font-weight: 600; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero h1 { font-size: 34px; }
  .about-grid, .case-two-col { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .process-steps { flex-direction: column; gap: 28px; }
  .process-steps::before { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  nav { display: none; }
}
@media (max-width: 600px) {
  .hero h1 { font-size: 28px; }
  section { padding: 60px 20px; }
  .product-grid { grid-template-columns: 1fr; }
  .case-header { flex-direction: column; padding: 22px 20px; }
  .case-body { padding: 24px 20px; }
  .footer-top { grid-template-columns: 1fr; }
}
```

---

✅ CSS完成！次は **HTML Part 1（Header〜About）** を送ります。準備できたら「**次へ**」と言ってください！