:root{--blue-900: #0a2540;--blue-800: #103a5c;--blue-700: #155e8c;--blue-600: #1c7db0;--blue-500: #2b96c9;--blue-300: #7ec8e3;--blue-100: #d6eef7;--blue-50: #eef7fb;--sand: #f7f3e8;--bg: #f4f8fb;--ink: #16313f;--ink-soft: #4a6573;--line: #d8e4ec;--accent: #ef8a3c;--ok: #1f9d6b;--warn-bg: #fff6e9;--warn-line: #f0c890;--radius: 14px;--shadow-card: 0 6px 20px rgba(16, 58, 92, .1);--max: 820px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}main{max-width:var(--max);margin:0 auto;padding:0 18px 48px;position:relative}a{color:var(--blue-700)}h1,h2,h3{line-height:1.35}.hero{width:100vw;margin-left:calc(50% - 50vw);background:linear-gradient(160deg,var(--blue-900) 0%,var(--blue-700) 55%,var(--blue-500) 100%);color:#fff;padding:56px 18px 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