*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--color-primary:#1a56db;--color-primary-dark:#1341b0;--color-accent:#e53e3e;--color-text:#1a202c;--color-text-light:#4a5568;--color-border:#e2e8f0;--color-bg:#f7fafc;--color-white:#fff;--max-width:800px;--font:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif}body{font-family:var(--font);color:var(--color-text);background:var(--color-white);line-height:1.7}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.btn{display:inline-block;padding:14px 32px;border-radius:8px;font-size:16px;font-weight:700;cursor:pointer;border:none;text-align:center;transition:background .15s}.btn-primary{background:var(--color-primary);color:var(--color-white)}.btn-primary:hover{background:var(--color-primary-dark);text-decoration:none}.btn-large{padding:18px 48px;font-size:18px}